This is my code
function sendMessage()
{
if(textMessage.value!=="close")
{
if(searchid==="John" && login_id==="Mary" || searchid==="Mary" && login_id==="John")
{
webSocket.send(textMessage.value);
textMessage.value="";
}
}
else
{
webSocket.close();
}
}
I am making a chat application and getting response from server.Firstly the server was sending response to all the clients connected to it.But now I am converting it into one to one client based chat but the problem is if john is chatting with mary these values are placed in database and I can only one time get the data from database via scriplet when page is loaded so how to implement it when user want to chat with say dave.Then I can't get the values from database.
I totally understand that you would like to write this by your self, but there are lots of frameworks out there that will help you with the complex stuff and let you focus on the actuall business issues to solve.
We use XSockets.NET most of the time since that is perfect for our needs.
Setting ap a one to one chat (or other scenarios) is very easy with XSockets since it is all about publish/subscribe... And you can also filter where to send messages on the server with powerful extension methods
A simple sample chat:
To save some time and keep it stupid and simple I will use two dropdowns where you select your name and the city you are in. So not actually 1-1, but it is so that you would get the concept.
JAVASCRIPT/MARKUP
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="Scripts/jquery-2.1.0.js"></script>
<script src="Scripts/moment.js"></script>
<script src="Scripts/XSockets.latest.js"></script>
<script src="Scripts/knockout-3.1.0.js"></script>
<script>
//viewmodel for our messages
var vm = {
messages : ko.observableArray([])
}
//xsockets connection
var conn;
$(function() {
ko.applyBindings(vm);
//Connect to our controller (Chat)
conn = new XSockets.WebSocket('ws://127.0.0.1:4502/Chat');
conn.onopen = function() {
//open, set city and username (for demo only)
conn.setProperty("UserName", $('#username').val());
conn.setProperty("City", $('#cities').val());
//listen for chatmesages
conn.on('chatmessage', function (d) {
//Add message to viewmodel
vm.messages.push(d);
});
}
//When we hit enter, send a message
$('input').on('keydown', function (e) {
if (e.keyCode == 13) {
//Build message, we do not need to set From since the server know who I am
var message = { Text: $(this).val(), Time: moment().format('MMMM Do YYYY, h:mm:ss a') };
conn.publish('chatmessage', message);
}
});
//When City or Username is changed, tell the server
$('#cities').on('change', function(d) {
conn.setProperty("City", $(this).val());
});
$('#username').on('change', function (d) {
conn.setProperty("UserName", $(this).val());
});
});
</script>
</head>
<body>
<input type="text" placeholder="type here, enter to send"/>
<select id="username">
<option value="steve">steve</option>
<option value="ben">ben</option>
<option value="tomas">tomas</option>
</select>
<select id="cities">
<option value="london">london</option>
<option value="paris">paris</option>
<option value="tokyo">tokyo</option>
</select>
<div data-bind="foreach:messages">
<h5 data-bind="text:From + ' - ' + Time"></h5>
<div data-bind="text:Text"></div>
</div>
</body>
</html>
C#
using XSockets.Core.XSocket;
using XSockets.Core.XSocket.Helpers;
namespace SimpleChat
{
public class ChatMessage
{
public string From { get; set; }
public string Text { get; set; }
public string Time { get; set; }
}
public class Chat : XSocketController
{
/// <summary>
/// My name, we set this from javascript...
/// </summary>
public string UserName { get; set; }
/// <summary>
/// We only send to people being in the same city, we set it from javascript
/// </summary>
public string City { get; set; }
/// <summary>
/// A user sends a message
/// </summary>
/// <param name="chatMessage"></param>
public void ChatMessage(ChatMessage chatMessage)
{
chatMessage.From = this.UserName;
//Send only to the client(s) being in the same city, but you can ofcourse change ot to another user only etc
this.SendTo(p => p.City == this.City, chatMessage,"chatmessage");
}
}
}
Summary
The only thing I did except the code above was to create a new project and then
Install XSockets (to start a xsockets server)
Install XSockets.JsApi (for publish subscribe over websockets)
Install jQuery (becasue I am lazy)
Install Momoent.JS (for working wiht dates in javascript)
Install knockoutjs (for modelbinding)
Added a XSockets bootstrapper into App_Start (found under Add->NewItem->XSockets->XSockets.Web.Bootstrapper
I guess you simply need to add control functionality to your program:
Add two listboxes and two buttons for picking sender, receiver (search_id,log_id)
List <string> logins=new List<string>();
List <string> search=new List<string>();
........
logins.Add("John");
logins.Add("Mary");
.....
search.Add("Dave");
listBox1.Datasource=logins;
listBox2.Datasource=search;
private void button1_Click(object sender, EventArgs e) //pick login_id
{
login_id_to_Compare=listBox1.SelectedValue.ToString();
}
private void button2_Click(object sender, EventArgs e) //pick searcid
{
searchid_to_Compare=listBox2.SelectedValue.ToString();
}
function sendMessage()
{
if(textMessage.value!=="close")
{
if((searchid===searchid_to_Compare) && (login_id===login_id_to_Compare))
{
webSocket.send(textMessage.value);
textMessage.value="";
}
}
else
{
webSocket.close();
}
}
Your send message seems too simplistic. There is not enough info for the server to route the message to the correct destination.
You would need to send along with the message the destination so your server can route the message to the correct user.
In your db you then can save the "to" and "from" and display the correct messages for only the parties involved.
You would of course have to add the fields to your chat program to select the destination.
function sendMessage(from, to, msg)
{
webSocket.send("{'from':" + from + ", 'to':" + to + ", 'msg': " + msg + "}");
}
Related
I'm working with socketio and netty with java and I'm new to both of them.
my client side code looks like this.
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
<title >webSocket test</title>
<script src="http://code.jquery.com/jquery-1.12.4.min.js"></script>
<script src="https://cdn.socket.io/3.1.3/socket.io.min.js" integrity="sha384-cPwlPLvBTa3sKAgddT6krw0cJat7egBga3DJepJyrLl4Q9/5WLra3rrnMcyTyOnh" crossorigin="anonymous"></script>
< !-- New Bootstrap core CSS file-->
<!-- Optional Bootstrap theme file (generally not necessary to import) -->
<!- -jQuery file. Be sure to introduce before bootstrap.min.js -->
<!-- The latest Bootstrap core JavaScript file-->
<script type=" text/javascript">
$(function(){
/**
* The socket.emit("event name", "parameter data") method of the
front-end js is used when triggering the back-end custom message event, * front-end js The socket.on("event name", anonymous function (data sent by the server to the client)) for monitoring server-side events
**/
//io({path: 'ws://localhost:9099/', transports: ['websocket'] ,upgrade: false});
var socket = io.connect("ws://localhost:9099",{transports: ['websocket'] ,upgrade: false});
var firstconnect = true;
if(firstconnect) {
console.log("First connection initialization");
//Monitor server connection event
socket.on('connect',function(){
socket.emit('messageEvent', 'Hello server');
console.log("First connection success");
$("#tou").html("Connect to the server successfully!");
});
//Monitor server shutdown service event
socket.on('disconnect', function(){
$("#tou").html("Disconnected from the server!");
});
//Monitor server Send message event
socket.on('responseEvent', function(data) {
console.log('data');
$("#msg").html($("#msg").html() + "<br/>" + data);
} );
firstconnect = false;
} else {
console.log("why?");
socket.socket.reconnect();
}
$('#send').bind('click', function() {
send();
});
function send(){
if (socket != null) {
var message = document.getElementById('message').value;
var title = "message";
var obj = {message:message,title:title};
var str = JSON.stringify(obj);
socket.emit("messageEvent",str);
console.log("message event" , str);
} else {
alert('Send');
}
}
});
</script>
</head>
<body>
<div class="page-header" id="tou">
webSocket Demo
</div>
<div class="well" id="msg">
</div>
<div class="col-lg">
<div class="input-group">
<input type="text" class="form-control" placeholder="send Message..." id="message">
<span class="input-group-btn">
<button class="btn btn-default" type="button" id="send" >send</button>
</span>
</div><!-- /input-group -->
</div><!-- /.col-lg-6 -->
</div><!-- /.row --><br><br>
</body>
</html>
The event handler is as shown below.
#Component
public class MessageEventHandler {
private static final Logger logger = LoggerFactory.getLogger(MessageEventHandler.class);
public static ConcurrentMap<String, SocketIOClient> socketIOClientMap = new ConcurrentHashMap<>();
#Autowired
private RedissonClient redisson;
#Resource
private SocketIOServer socketIOServer;
#OnConnect
public void onConnect(SocketIOClient client){
Map<String,Object> clientMap = new HashMap<>(16);
client.sendEvent("responseEvent", client.getSessionId().toString()+": "+ "hello");
if(client!=null){
String room = client.getHandshakeData().getSingleUrlParam("room");
String nameSpace = client.getNamespace().getName();
logger.info("namespace {} ",nameSpace);
String sessionId = client.getSessionId().toString();
logger.info("namespace, room={}, sessionId={},namespace={}",room,sessionId,nameSpace);
if(StringUtils.isEmpty(room)){
//client.joinRoom(room);
clientMap.put("rooms",room);
}
clientMap.put("createTime", LocalDateTime.now().toString());
redisson.getBucket("room"+sessionId).trySet(clientMap);
}
return;
}
/**
* Triggered when the client closes the connection
*
* #param client
*/
#OnDisconnect
public void onDisconnect(SocketIOClient client) {
logger.info("client:" + client.getSessionId() + "disconnected");
}
/**
* Client events
*
* #param client
* #param request
* #param msg
*/
#OnEvent(value = "messageEvent")
public void onMessageEvent(SocketIOClient client, AckRequest request, String msg) {
System.out.println("haha");
logger.info("message ：" + msg);
//Post the message back
JSONObject jsonObject = JSON.parseObject(msg);
String message = jsonObject.getString("message");
Collection<SocketIOClient> clients = socketIOServer.getBroadcastOperations().getClients();
for (SocketIOClient clientByRoom : clients) {
clientByRoom.sendEvent("responseEvent", client.getSessionId().toString()+": "+message);
}
}
}
The server starter code is shown below.
#Component
#Order(1)
public class SocketServerRunner implements CommandLineRunner {
private static Logger logger = LoggerFactory.getLogger(SocketServerRunner.class);
#Resource
private SocketIOServer socketIOServer;
#Resource
private PubSubStore pubSubStore;
#Autowired
private RedissonClient redisson;
#Override
public void run(String... args) throws Exception {
logger.info("socketIOServer ");
socketIOServer.start();
pubSubStore.subscribe(PubSubType.DISPATCH, data -> {
Collection<SocketIOClient> clients = null;
String room = data.getRoom();
String namespace = data.getNamespace();
Packet packet = data.getPacket();
String jsonData = packet.getData();
if(!StringUtils.isEmpty(namespace)){
SocketIONamespace socketIONamespace = socketIOServer.getNamespace(namespace);
if(StringUtils.isEmpty(room)){
clients = socketIONamespace.getRoomOperations(room).getClients();
}
}else{
clients = socketIOServer.getBroadcastOperations().getClients();
}
if(!CollectionUtils.isEmpty(clients)){
for (SocketIOClient client : clients) {
client.sendEvent("messageEvent",jsonData);
}
}
}, DispatchMessage.class);
// addNameSpace(socketIOServer);
}
I'm getting a connection registration on the OnConnect annoted method, but the method seems to run two times cause I get the log twice while the socket connects. I don't know why it happens.
But even worse is the emit method doesn't work that is written in client side javascript. There is no error. The log below the emit is executed. But the OnEvent annoted method in the java EventHandler doesn't seem to detect it.
Can someone help me understand this?
Apparently it seems the problem is with the libraries. There is some compatibility issue with newer versions of socketio client library with netty dependencies for java and it is causing the weird problems.
My dependency for netty socketio is shown below which obviously is the latest as of answering this question.
<dependency>
<groupId>com.corundumstudio.socketio</groupId>
<artifactId>netty-socketio</artifactId>
<version>1.7.19</version>
</dependency>
And for the client library to work smoothly I had to downgrade the library from 3.X.X to 2.X.X .
In my case from
<script src="https://cdn.socket.io/3.1.3/socket.io.min.js" integrity="sha384-cPwlPLvBTa3sKAgddT6krw0cJat7egBga3DJepJyrLl4Q9/5WLra3rrnMcyTyOnh" crossorigin="anonymous"></script>
to
<script src="https://cdn.bootcss.com/socket.io/2.1.1/socket.io.js"></script>
Here I have created dynamic dropdown list using this link, but when I select some value from available list it should be called in action class.
The dropdown list which can be seen in the image ,here the values are loaded dynamically from the database and now what I want is when I select any value from that two dropdown list that values (I mean text value) should be sent to the action class and there I will execute one JDBC select query on the basis of this two values and will display in the table shown in the image but everything should be on load.Action should be on selecting values from dropdown list not on any button click .With static values I am able to call value from dropdown list into action class with name attribute.But in this case I cannot :(
I hope I am clear now .
I have tried calling select tag using listkey,name and id but none of them worked .
Below is my JSP code:
<div>
<div class="invoicetext1">Event Name :</div>
<s:select name="dp.eventState"
list="%{state}"
class="billlistbox1"
id="eventName" />
<div>
<s:select name="dp.companyState"
class="billlistbox2"
listKey="companyState"
list="%{status}">
</s:select>
</div>
<div class="invoicetext2">Company Name :</div>
<div class="clear"></div>
</div>
<s:form action="ActionSelect">
<s:submit value=" Click Here"/>
</s:form>
<div>
Action class for loading dynamic dropdown list :
package com.ca.actions;
import java.sql.Connection;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import com.ca.database.Database;
import com.ca.pojo.Event;
import java.sql.PreparedStatement;
import com.opensymphony.xwork2.ActionSupport;
public class RetrieveEvNaCoNaAction extends ActionSupport {
private static final long serialVersionUID = -5418233715172672477L;
List<Event> dataForBillsJspList;
private List state = new ArrayList();
private List status = new ArrayList();
String eventName;
public String getEventName() {
return eventName;
}
public void setEventName(String eventName) {
this.eventName = eventName;
}
public RetrieveEvNaCoNaAction() {
// TODO Auto-generated constructor stub
}
public List<Event> getDataForBillsJspList() {
return dataForBillsJspList;
}
public void setDataForBillsJspList(List<Event> dataForBillsJspList) {
this.dataForBillsJspList = dataForBillsJspList;
}
public List getStatus() {
return status;
}
public void setStatus(List status) {
try {
Database database = new Database();
Connection con = database.Get_Connection();
PreparedStatement ps = con
.prepareStatement("SELECT EVENT_NAME,COMPANY_NAME,date_format(FROM_DATE,'%d/%m/%Y') as dateAsFrom,date_format(TO_DATE,'%d/%m/%Y') as dateAsTo FROM EVENT");
ResultSet rs = ps.executeQuery();
//dataForBillsJspList = new ArrayList<Event>();
while (rs.next()) {
/*dataForBillsJspList.add(new Event(rs.getString("EVENT_NAME"),
rs.getString("COMPANY_NAME"), rs
.getString("dateAsFrom"), rs
.getString("dateAsTo")));
System.out.println(rs.getString("EVENT_NAME"));*/
status.add(rs.getString("COMPANY_NAME"));
}
System.out.println("Data Collected ...");
}catch(Exception e)
{
e.printStackTrace();
}
}
public List getState() {
return state;
}
#Override
public String execute() throws Exception {
// TODO Auto-generated method stub
setState(this.state);
setStatus(this.status);
return "success";
}
public String showEventDetails(){
System.out.println("Hi.."+eventName);
return SUCCESS;
}
public void setState(List state) {
//implement the application specific logic to
try {
Database database = new Database();
Connection con = database.Get_Connection();
PreparedStatement ps = con
.prepareStatement("SELECT EVENT_ID,EVENT_NAME,COMPANY_NAME,CONTACT_PERSON,CONTACT_NO,EMAIL_ID,EVENT_VENUE,date_format(FROM_DATE,'%d/%m/%Y') as dateAsFrom,date_format(TO_DATE,'%d/%m/%Y') as dateAsTo ,EVENT_TIME FROM EVENT");
ResultSet rs = ps.executeQuery();
dataForBillsJspList = new ArrayList<Event>();
while (rs.next()) {
dataForBillsJspList.add(new Event(rs.getString("EVENT_ID"),rs.getString("EVENT_NAME"),
rs.getString("COMPANY_NAME"),rs.getString("CONTACT_PERSON"),rs.getString("CONTACT_NO"),rs.getString("EMAIL_ID"),rs.getString("EVENT_VENUE"), rs
.getString("dateAsFrom"), rs
.getString("dateAsTo"),rs.getString("EVENT_TIME")));
//System.out.println(rs.getString("EVENT_NAME"));
state.add(rs.getString("EVENT_NAME"));
System.out.println(rs.getString("EVENT_ID"));
}
System.out.println("Data Collected ...");
}catch(Exception e)
{
e.printStackTrace();
}
//Here for displaying the data on UI, we are using few hardcoded values//
}
}
After loading dynamic dropdown list now i am trying to call selected value in action class by S.O.P but it gives null pointer exception. Below is my POJO class:
package com.ca.pojo;
public class Dropdown
{
private String eventState;
private String companyState;
public Dropdown() {
// TODO Auto-generated constructor stub
}
public String getEventState() {
return eventState;
}
public void setEventState(String eventState) {
this.eventState = eventState;
}
public String getCompanyState() {
return companyState;
}
public void setCompanyState(String companyState) {
this.companyState = companyState;
}
}
and below is action class where I am trying to call that selected value by using name attribute :
package com.ca.actions;
import com.ca.pojo.Dropdown;
import com.opensymphony.xwork2.ActionSupport;
public class DropdownAction extends ActionSupport
{
Dropdown dp;
public DropdownAction() {
// TODO Auto-generated constructor stub
}
public Dropdown getDp() {
return dp;
}
public void setDp(Dropdown dp) {
this.dp = dp;
}
#Override
public String execute() throws Exception {
// TODO Auto-generated method stub
System.out.println(dp.getEventState());
return "success";
}
}
struts.xml is properly configured. Now after selecting two values I want to display data in the below table accordingly without any button click but in jsp i have created button just to see whether i am getting the selected value in action class but in actual i want it without any button click.
Well, there is a huge mess here :D
First of all, the NullPointerException is thrown because the values are not sent, and the values are not sent because they're not in the form.
You should enclose them in the form like this for them to be sent to the ActionSelect action:
<s:form action="ActionSelect">
<div class="invoicetext1">Event Name :</div>
<s:select name="dp.eventState"
list="%{state}"
class="billlistbox1"
id="eventName" />
<div>
<s:select name="dp.companyState"
class="billlistbox2"
listKey="companyState"
list="%{status}">
</s:select>
</div>
<div class="invoicetext2">Company Name :</div>
<div class="clear"></div>
</div>
<s:submit value=" Click Here"/>
</s:form>
Solved the mistery, this doesn't solve your problem, though.
You have two main ways to contact actions from a page:
Using a standard submit (as you're doing):
you either submit a form with its content, or call a link by eventually passing parameters in the querystring. This creates a Request, that will contact an action, that will return an entire JSP, that will be loaded in place of the page you're on now.
Using AJAX:
you POST or GET to an action without changing the current page, and the action can return anything, like a JSP snippet, a JSON result, a binary result (through the Struts2 Stream result), etc...
You then can choose what to do with the returned data, for example load it inside a <div> that before was empty, or had different content.
Now your problem is that you're contacting an action that is not the one you're coming from (is not able to re-render the entire JSP you're on) and you're calling it without using AJAX, then whatever the object mapped to the "success" result is (the whole JSP, or a JSP snippet), it will be loaded in place of the JSP you're on, and it will fail.
Since you seem to be quite new to this, I suggest you start with the easy solution (without AJAX), and after being expert with it, the next time try with AJAX.
That said,
avoid putting logic in getters and setters;
avoid calling methods that are not setter as setters (setState, setStatus...);
always make your attributes private;
try giving speaking names to variables: state and status for event states and company states are really confusing; and what about "state" instead of "name" (in jsp and on DB is "name");
consider loading informations like selectbox content in a prepare() method, so they will be available also in case of errors;
you're not closing the connections (and BTW it would be better to use something more evoluted, like Spring JDBC, or better Hibernate, or even better JPA, but for now keep going with the raw queries)
The following is a refactoring of your code to make it achieve the goal. I'll use #Getter and #Setter only for syntactic sugar (they're Lombok annotations, but you keep using your getters and setters, it's just for clarity):
<head>
<script>
$(function(){
$("#event, #company").on('change',function(){
$("#myForm").submit();
});
});
</script>
</head>
<body>
<form id="myForm">
<div>
...
<s:select id="event" name="event" list="events" />
...
<s:select id="company" name="company" list="companies" />
...
</div>
</form>
<div>
...
Table - iterate **dataForBillsJspList** here
...
</div>
</body>
public class RetrieveEvNaCoNaAction extends ActionSupport {
private static final long serialVersionUID = -5418233715172672477L;
#Getter private List<Event> dataForBillsJspList = new ArrayList<Event>();
#Getter private List<String> events = new ArrayList<String>();
#Getter private List<String> companies = new ArrayList<String>();
#Getter #Setter private String event = null;
#Getter #Setter private String company = null;
#Override
public void prepare() throws Exception {
Connection con;
try {
con = new Database().Get_Connection();
// load companies
PreparedStatement ps = con.prepareStatement("SELECT DISTINCT company_name FROM event");
ResultSet rs = ps.executeQuery();
while (rs.next()) { companies.add(rs.getString("company_name")); }
// load events
ps = con.prepareStatement("SELECT DISTINCT event_name FROM event");
rs = ps.executeQuery();
while (rs.next()) { events.add(rs.getString("event_name")); }
} catch(Exception e) {
e.printStackTrace();
} finally {
con.close();
}
}
#Override
public String execute() {
Connection con;
try {
con = new Database().Get_Connection();
// load the table. The first time the table is loaded completely
String sql = "SELECT EVENT_ID, EVENT_NAME, COMPANY_NAME, CONTACT_PERSON, CONTACT_NO, EMAIL_ID, EVENT_VENUE, " +
"date_format(FROM_DATE,'%d/%m/%Y') as dateAsFrom, date_format(TO_DATE,'%d/%m/%Y') as dateAsTo ,EVENT_TIME " +
"FROM event";
String where = "";
// if instead this action has been called from the JSP page,
// the result is filtered on event and company:
if (event!=null && company!=null) {
where = " WHERE event_name = ? AND company_name = ?";
}
// load companies
PreparedStatement ps = con.prepareStatement(sql + where);
if (where.length()>0) {
ps.setString(1,event);
ps.setString(2,company);
}
ResultSet rs = ps.executeQuery();
while (rs.next()) {
dataForBillsJspList.add(new Event(rs.getString("EVENT_ID"),rs.getString("EVENT_NAME"),rs.getString("COMPANY_NAME"),
rs.getString("CONTACT_PERSON"),rs.getString("CONTACT_NO"),rs.getString("EMAIL_ID"),
rs.getString("EVENT_VENUE"), rs.getString("dateAsFrom"), rs.getString("dateAsTo"),
rs.getString("EVENT_TIME")));
}
} catch(Exception e) {
e.printStackTrace();
} finally {
con.close();
}
return SUCCESS;
}
}
It is a kickoff example, but it should work.
The next steps are:
create a POJO with id and description, show the description in the select boxes, but send the id
use header values ("please choose an event"...) and handle in action conditional WHERE (only company, only event, both)
PAGINATION
Good luck
Using Javascript/jQuery you can do this, it depends on what you want to do after reached action class.
If you want to navigate to another page use the code below.
Add onchange event as an attribute to your dropdown,
onchange="customFunction(this.value)"
create customFunction in header part,
function customFunction(selectedValue){
window.location="Action_URL?myValue="+selectedValue;
}
Or if you want to return back the same page use jQuery ajax,
$("#eventName").change(function(e){
var selectedValue = $(this).val();
$.ajax({
type : 'post',
url : 'Action_URL',
data: { myValue: selectedValue},
success : function(data) {
alert(data);
console.log(data);
}
});
});
Hope this helps.
I am new to Spring and web technology.
I have an table which contains a column with hyperlink. When I click on the hyperlink of a row, I need to display that rows data along with other details in a dialog. My controller method returns a ModelAndView which contains the data I need to show and the display page.
Problems:
How to show the dialog? and
How to pass the data to the dialog?
Table.jsp
<script type="text/javascript">
function showDialog(ref, date) {
$ajax({
type: "POST",
url: "/example/show.htm",
data: {
ref: ref,
date: date
}
success: function(data) {
},
error: function(data) {
}
});
}
</script>
Mapping
#RequestMapping(value = "show.htm", method=RequestMethod.POST)
public ModelAndView show(#RequestParam("ref") String ref, #RequestParam("date") String date,
HttpServletRequest request, HttpServletResponse response) {
ModelAndView modelAndView = new ModelAndView();
try {
SampleDTO SampleDTO = new SampleDTO();
sampleDTO.setDate(sdf.parse(date));
sampleDTO.setRef(ref);
SampleDTO billDto = // server call modelAndView.addObject("showBill", sampleDto);
modelAndView.setViewName("Dialog");
}
return modelAndView;
}
Your code is wrong, you are messing things, if you want to use jQuery and ajax calls then don't use ModelAndView in your Spring controller. Instead of that, use the following and return your bean or dto as a json using Jackson library from Java:
Include this jar in your lib project folder:
http://www.java2s.com/Code/JarDownload/jackson/jackson-all-1.9.9.jar.zip
Java code:
#RequestMapping(value = "businessBill.htm", method = RequestMethod.POST)
#ResponseBody
public String handleBusinessBillDetails(#RequestParam("reference") String billReference, #RequestParam("invoiceDate") String billDate,
HttpServletRequest request, HttpServletResponse response) {
String json = null;
try {
//1. Create 'jackson' object mapper
ObjectMapper objectMapper = new ObjectMapper();
BusinessBillDTO businessBillDTO = new BusinessBillDTO();
businessBillDTO.setBillDate(sdf.parse(billDate));
businessBillDTO.setBillReference(billReference);
BusinessBillDTO billDto = accountStatementBO.getBusinessBillDetails(businessBillDTO);
//2. Convert your 'bean' or 'dto' as 'json' string
json = objectMapper.writeValueAsString(billDto);
} catch (Exception ex) {
LOGGER.error(ex);
}
return json;
}
Then, in Table.jsp put the div used in Dialog.jsp as hidden, this will be your modal dialog in future (note that there are some changes in the span tags also):
<div id="BusinessBill" style="display:none;">
<h2>Bill Details</h2>
<em>Business Ltd</em>
<div class="row">
<span class="spanAsLabel">Account number</span>
<span id="dlg-account-number" class="spanAsLabel"></span>
</div>
<div class="row">
<span class="spanAsLabel">Bill date</span>
<span id="dlg-bill-date" class="spanAsLabel"></span>
</div>
</div>
Now fix your getBusinessBill(..) method like this:
You can also use $.ajax and maybe handle more states like onerror and others but this way is simpler (at least for me, you just need to evaluate if the returned data is null or not and let know the user - if null - that something happened at server side, maybe showing an alert with a generic message) - please read comments.
function getBusinessBill(billReference, billInvoiceDate) {
$.post("/AccountStatement/businessBill.htm", {
reference: billReference,
invoiceDate: billInvoiceDate
}, function (data) {
/* You can implement more validations for 'data', in my case I just used these 'if' conditionals but can vary. */
if(data != null) { //returned 'data' is not 'null'
/* parse 'data' as 'json' object
* will be good to console.log(data) and take a look. */
var obj = $.parseJSON(data);
if(obj != {}) { //check if 'data' is not an empty 'json' object once transformed
//set the 'data' in the dialog
$('#dlg-account-number').text(obj.accountNumber);
$('#dlg-bill-date').text(obj.billDate);
/* open modal dialog, you can simulate it this way (for this case)
* but the correct way is to use 'jquery-ui' dialog or any plugin you prefer.
* At this point you will see the hidden 'div' in a visible way with your 'data'.
*/
$('#BusinessBill').fadeIn();
} else {
//show 'generic' message
alert('No results found.');
}
} else {
//show 'generic' message
alert('An error occurred, try again.');
}
});
}
Finally, if everything is correct, you will see at the same page (Table.jsp) the modal dialog with your data, all made by an ajax call to avoid redirection pages like (Table.jsp to => Dialog.jsp).
I want to call java methods in javascript and Andrew Thompson suggested to use the deployJava.js library for this. I followed these instructions:
http://docs.oracle.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html
Here is explained how to use the java class in javascript, but I would like to call the java methods from within the javascript. (This is because I want to import a .owl file in java en export the information in json-format to my code written in javascript.)
Does anybody know how to do this with the deployJava library?
This is my code to import the java file:
<noscript>A browser with JavaScript enabled is required for this page to operate properly.</noscript>
<h1>Sending Messages to Other Applets</h1>
<script>
function sendMsgToIncrementCounter() {
receiver.incrementCounter();
}
</script>
<p>Sender Applet</p>
<script>
var attributes = { id:'sender', code:'Sender.class', width:300, height:50} ;
var parameters = {} ;
deployJava.runApplet(attributes, parameters, '1.6');
</script>
<br/>
<br/>
<p>Receiver Applet</p>
<script>
var attributes = { id:'receiver', code:'../Receiver.class', width:300, height:50} ;
var parameters = {} ;
deployJava.runApplet(attributes, parameters, '1.6');
</script>
and this is are the sender and receiver java files:
import javax.swing.*;
public class Receiver extends JApplet {
private int ctr = 0;
private JLabel ctrLbl = null;
public void init() {
//Execute a job on the event-dispatching thread; creating this applet's GUI.
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
ctrLbl = new JLabel("");
add(ctrLbl);
}
});
} catch (Exception e) {
System.err.println("Could not create applet's GUI");
}
}
public void incrementCounter() {
ctr++;
String text = " Current Value Of Counter: " + (new Integer(ctr)).toString();
ctrLbl.setText(text);
}
}
import javax.swing.*;
import java.awt.event.;
import netscape.javascript.;
public class Sender extends JApplet implements ActionListener {
public void init() {
//Execute a job on the event-dispatching thread; creating this applet's GUI.
try {
final ActionListener al = this;
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
JButton btn = new JButton("Click To Increment Counter");
add(btn);
btn.addActionListener(al);
}
});
} catch (Exception e) {
System.err.println("createGUI didn't complete successfully");
}
}
public void actionPerformed(ActionEvent e) {
try {
JSObject window = JSObject.getWindow(this);
window.eval("sendMsgToIncrementCounter()");
} catch (JSException jse) {
jse.printStackTrace();
}
}
}
I just copy-paste this from the example given on this site:
http://docs.oracle.com/javase/tutorial/deployment/applet/iac.html
This example works perfect in my browser, so the way it is done is correct, but I suspect that I don't import the javafiles correct, since this are the errors from je java-console:
load: class Sender.class not found.
java.lang.ClassNotFoundException: Sender.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:195)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Plugin2ClassLoader.java:249)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:179)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Plugin2ClassLoader.java:160)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:690)
at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3045)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1497)
at java.lang.Thread.run(Thread.java:680)
Exception: java.lang.ClassNotFoundException: Sender.class
Combining your original method, with the new JS snippet, and part of the accepted answer on your last question (tweaked), gives..
<html>
<head>
<script>
// dangerous to have a 0x0 applet! Some security plug-ins regard it
// as suspicious & automatically remove the element. Better to set it
// not visible using styles
var attributes = {
codebase:'../sesame',
code:'applet_test',
width:10,
height:10
};
var parameters = {fontSize:16} ;
var version = '1.6' ;
deployJava.runApplet(attributes, parameters, version);
function test() {
var app = document.applet_test;
alert("Screen Dimension\r\n width:" + app.getScreenWidth()
+ " height:" + app.getScreenHeight());
}
</script>
<body>
<FORM>
<INPUT
type="button"
value="call JAVA"
onClick = "test()">
</FORM>
<script>
deployJava.runApplet(attributes, parameters, version);
</script>
</body>
</html>
But I just wrote that up off the top of my head. Don't trust me, trust a validation service. ;)
I would advise setting up a simple webservice that your javascript code can use. It doesn't need to be very involved, personally I'd use a simple REST layout with JAX-RS (jersey is really nice to work with), especially if you want something simple with JSON support built-in (with the right plugin).
Trying to actually communicate with the applet on the page might be possible, but very browser dependent and IMHO not worth the hassle. If you're working on the web, might as well use a web service.
There was a problem with the directory of the .class files given in the attributes. Here is the correct code:
<p>Sender Applet</p>
<script>
var attributes = { id:'sender', code:'sesame/Sender.class', archive:'sesame/applet_SenderReceiver.jar', width:300, height:50} ;
var parameters = {} ;
deployJava.runApplet(attributes, parameters, '1.6');
</script>
<br/>
<br/>
<p>Receiver Applet</p>
<script>
var attributes = { id:'receiver', code:'sesame/Receiver.class', archive:'sesame/applet_SenderReceiver.jar', width:300, height:50} ;
var parameters = {} ;
deployJava.runApplet(attributes, parameters, '1.6');
</script>
Can anyone teach me or direct to a working example to satisfy this requirement.
Scenario:
List item My Web App is using spring mvc.
One of the services it provides is that when the user clicks on a button a long running process will occur on the server. (Query database, write files, write logs, etc...) this process can take a few seconds or a few minutes.
*Problem***
How can I implement the service to update the client of its progress.
The service returns true or false if the process was successful.
Thanks for your replies. A code snippet or a complete tutorial will be most helpful.
Here is a possible solution to this progress bar problem:
task.jsp
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<%#taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<html>
<head>
<script src="../js/jquery.min.js"></script>
<script>
$(document).ready(function () {
$.getJSON(window.location.href.concat('/status'), function(data) {
if (data === "created") {
} else {
// task is already being executed
refreshProgress();
}
});
});
var width = 0;
function getProgress() {
$.getJSON(window.location.href.concat('/progress'), function(percentage) {
$('#progressBar').css('width', percentage+'%');
document.getElementById("label").innerHTML = percentage * 1 + '%';
width = percentage;
});
}
function start() {
$.ajax({
type: "post",
data: $('#task').serialize(),
success: function(data) {
$('#progressBar').css('width', 100+'%');
document.getElementById("label").innerHTML = 100 * 1 + '%';
// do sth with the data after finished task
}
});
width = 0;
$('#progressBar').css('width', 0+'%');
document.getElementById("label").innerHTML = 0 * 1 + '%';
refreshProgress();
}
function refreshProgress() {
$("#btnStart").prop("disabled",true);
var id = setInterval(frame, 1000);
function frame() {
if (width >= 100) {
clearInterval(id);
$("#btnStart").prop("disabled",false);
} else {
getProgress();
}
}
}
</script>
</head>
<body>
<div class="container">
<h2 class="text-center">Progress Bar Example</h2>
<div class="progress">
<div id="progressBar" class="progress-bar" role="progressbar" aria-valuenow="70" aria-valuemin="0" aria-valuemax="100" style="width:0%">
<div id="label">0%</div>
</div>
</div>
<form:form method="POST" commandName="task" cssClass="form-horizontal">
<fieldset>
<div class="form-group">
<label class="col-md-4 control-label" for="btnStart">Actions</label>
<div class="col-md-8">
<button id="btnStart" name="btnStart" class="btn btn-success">Start</button>
<button id="btnStop" name="btnStop" class="btn btn-danger">Stop</button>
</div>
</div>
</fieldset>
</form:form>
</div>
<script>
$('#task').submit(function () {
start();
return false;
});
</script>
</body>
</html>
TaskController.java
#Controller
#RequestMapping(value = "/task")
public class TaskController {
private Task task;
#RequestMapping("")
protected ModelAndView page() {
ModelAndView model = new ModelAndView(VIEW_DIR + "task");
if (this.task == null) {
this.task = new Task();
}
model.addObject("task", this.task);
return model;
}
#RequestMapping(value = "/status", method = GET)
public #ResponseBody
String getStatus() {
return task.getStatus();
}
#RequestMapping(value = "/progress", method = GET)
public #ResponseBody
int getProgress() {
return task.getProgress();
}
public ModelAndView form(#ModelAttribute Task task) {
this.task = task;
ModelAndView model = new ModelAndView(VIEW_DIR + "task");
task.execute();
model.addObject("task", this.task);
return model;
}
}
Task.java
public class Task {
private int total;
private int progress;
private String status;
public Task() {
this.status = "created";
// TODO get total here or pass via form
}
public void execute() {
status = "executing";
int i = 0;
while (i < total && status.equals("executing")) {
progress = (100 * (i + 1) / total);
i++;
}
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public int getProgress() {
return progress;
}
public void setProgress(int progress) {
this.progress = progress;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}
There are a good number of ways to handle a scenario like this. One way is to model the work in terms of a "Process", which contains a "status", including a percentage completion.
If you imagine what this might look like on a website, clicking the button to start the process would submit a form that begins the process and assigns some sort of identity to the process, almost like if you were creating any other sort of object. It would then redirect you to a "process status" page.
The process status page would query for the status of the process and display it. It'd probably have a URL parameter for the process's ID. It would perhaps update itself using an AJAX call to return a progress percentage.
On the backend, you now need to solve a couple of problems: finding out the current status of process N, and updating the status of process N. You could accomplish this in a number of ways, including storing the progress in the database or having some sort of in-memory table of running jobs. You could also use some sort of heuristic to estimate a percent. For example, if it's a "register new user" job, maybe it's 20% done if the user's table has an email address, 40% done if the user avatar table has data in it for this user, etc. I don't recommend this as much.