Why isn't JSP out.print() function working properly - java

I've been working with a JSP+Java+Html, and I've encountered a problem with out.print() function, in a for cycle.
My function getGeneAvailableTaxonomies() returns a list of integer numbers (of type List<Integer>), and I want to print these numbers in an interface.
Here's my code:
for(Integer i : ApplicationExtender.getApplicationExtender(application).getGeneAvailableTaxonomies())
{
out.print(String.format("<option value=\"%1$d\">%2$s</option>", i, TaxonId.getOrganismFromId(i)));
}
The doce %1$d should stand for the i integer value, while %2$s should stand for the other parameter, the taxonomy id value as String.
But, unfortunately, this is what appears:
While I would like to see something like:
There's surely an error on my out.print() function call... but what's wrong?
Many thanks


You dont need the "$" in your format String. As you may know, using scriptlets is not a good way to do Java Web Development. I think that using JSTL is far better, as you won't mix Java code with markup in your JSP's.
Edit: The printf method is not present in out object as I said earlier, since it is a JspWriter and JspWriter not inherit from PrintWriter (that have printf). Sorry. So, try this (it worked for me).
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<select>
<%
String[] strings = new String[]{ "aaa", "bbb", "ccc", "ddd" };
for ( int i = 0; i < strings.length; i++ ) {
out.print( String.format( "<option value='%d'>%s</option>", i, strings[i] ) );
}
%>
</select>
</body>
</html>
If you want to use a PrintWriter as in Servlets, so this will work:
<%#page import="java.io.PrintWriter"%>
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<select>
<%
PrintWriter writer = new PrintWriter( out );
String[] strings = new String[]{ "aaa", "bbb", "ccc", "ddd" };
for ( int i = 0; i < strings.length; i++ ) {
writer.printf( "<option value='%d'>%s</option>", i, strings[i] );
}
%>
</select>
</body>
</html>


Your print/format code seems OK when I run it on http://ideone.com/u8fDT. You probably just need to have the JSP recompiled (should probably happen automatically but may sometimes require server restart).
Also, mixing HTML and Java code like this is a pretty painful way to work. JSTL or a templating system like FreeMarker would make your life easier.


try this as much i have understood :
String option = "<option value=\""+d+"\">"+s+"</option>";
out.print(option);
using String.format
out.print(String.format("<option value=\"%d\">%s</option>", i, TaxonId.getOrganismFromId(i)));
Updated
as you have mentioned in comments that TaxonID.getOrganismFromId(i) is returning int so the there is only one change in your original code %2$s to %2$d thats it...
out.print(String.format("<option value=\"%1$d\">%2$d</option>", i, TaxonId.getOrganismFromId(i)));

Related

Enumeration<> Enumeration difference

I'm a biginner in JSP and I'm confused about the difference between
Enumeration and Enumeration<type>
I'm learning with this Korean book and the example source in it says Enumeration
with the eclipse neon version it doesn't work. It works only when it write
Enumeration<String>. Can someone tell me the difference?
<%#page import="java.util.Enumeration"%>
<%# page language="java" contentType="text/html;
charset=UTF-8"pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>헤더 목록 출력</title>
</head>
<body>
<%
Enumeration<String> headerEnum = request.getHeaderNames();
while(headerEnum.hasMoreElements()){
String headerName = (String)headerEnum.nextElement();
String headerValue = request.getHeader(headerName);
%>
<%=headerName %> = <%=headerValue %> <br>
<%
}
%>
</body>
</html>

Just give it a look at the Enumeration documentation. Also review the generic types documentation.
By usingEnumeration you are using Enumeration<Object> as it is the default. What this <Object> does is just indicate the Enumeration class that in that particular instance, the type that it calls E (in the Enumeration Documentation) will be resolved to Object. By using <String> happens the same: the type called E will be resolved to String.
If you check the nextElement() signature it returns E. So, by using Enumeration or Enumeration<Object> that method will return Object and you will need the cast you did:
String headerName = (String)headerEnum.nextElement();
By using Enumeration<String> the method will return an String, so you can directly do this:
String headerName = headerEnum.nextElement();

Split on pipe doesn't behave as expected

I have a code that get a HTML content from a page, then get the index of a specific strings, after that it splits it.
My problem is, It's not splitting right, Plus it's getting unwanted Strings .
Code :
URL = "https://drive.google.com/file/d/0B7--EhvK76QDRktKZm04MXVjVTQ/view";
html = Jsoup.connect(URL).get().html();
FirstDecoded = URLDecoder.decode(html, "UTF-8");
int Start = FirstDecoded.indexOf("[\"fmt_stream_map\"");
int End = FirstDecoded.indexOf("\"fmt_list\"");
String FirstSplit = FirstDecoded.substring(Start + 22, -5 + End);
String[] DummyTexts = {"<html>","<head>","</head>","<body>","</body>","</html"};
if(FirstSplit.contains(DummyTexts[0]))
FirstSplit.replace(DummyTexts[0],"");
if(FirstSplit.contains(DummyTexts[1]))
FirstSplit.replace(DummyTexts[1],"");
if(FirstSplit.contains(DummyTexts[2]))
FirstSplit.replace(DummyTexts[2],"");
if(FirstSplit.contains(DummyTexts[3]))
FirstSplit.replace(DummyTexts[3],"");
if(FirstSplit.contains(DummyTexts[4]))
FirstSplit.replace(DummyTexts[4],"");
FirstSplit.trim();
String[] Splitted = FirstSplit.split("|");
What i want :
Before Split
Url|Url|Url|Url
After Split
[0] = URL
[1] = 2nd URL
Result (What i don't want ) :
<!html>*a new line*<head></head>*a new line*<body>*a new line**white space*URL|URL|URL*a new line**2 White Space*</body></html>
If i try to split it, [0] is null, [1] is <! .
The HTML is :
<!doctype html>
<html>
<head>
<meta name="google" content="notranslate">
<meta http-equiv="X-UA-Compatible" content="IE=edge;">
<meta name="fragment" content="!">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0">
<title>OnClick.mp4 - Google Drive</title>
<meta property="og:title" content="OnClick.mp4">
<meta property="og:type" content="article">
<meta property="og:site_name" content="Google Docs">
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</script>
<script>window.gapi_onload=function(){};var scriptEl$$inline_0=document.createElement("script");scriptEl$$inline_0.src="https://apis.google.com/js/client.js";scriptEl$$inline_0.async=!0;var firstScriptEl$$inline_1=document.getElementsByTagName("script")[0];firstScriptEl$$inline_1.parentNode.insertBefore(scriptEl$$inline_0,firstScriptEl$$inline_1);
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,["fmt_list","37/1920x1080/9/0/115,22/1280x720/9/0/115,35/854x480/9/0/115,59/854x480/9/0/115,34/640x360/9/0/115,18/640x360/9/0/115,43/640x360/99/0/0"]
,["url_encoded_fmt_stream_map","itag\u003d37&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=37&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=3DC24BBB45AB0C09B1633ABC215282DAD3275086.1E524A3C98B38084443AF227B4676FA122CB7191&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/mp4; codecs="avc1.42001E, mp4a.40.2"&quality\u003dhd1080,itag\u003d22&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=22&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=92CE58A6991267C1E6F28C23DC9C03F5CF7E0C7A.77E9DBA8D81F681587D68E2C9EF942DAA37D8461&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/mp4; codecs="avc1.42001E, mp4a.40.2"&quality\u003dhd720,itag\u003d35&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=35&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=92E5A471515BC4145F258D67C6E52F7CA0FA2530.73516C4866808CD98769225F3623A93613B65F1E&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/x-flv&quality\u003dlarge,itag\u003d59&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=59&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=66DCB19D441D9742A4D21F1A08CDF488C81F728D.1864D7646337ED87C9A82951A0D524B6B3CEF451&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/mp4; codecs="avc1.42001E, mp4a.40.2"&quality\u003dlarge,itag\u003d34&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=34&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=1837C0B9C77AF259371C0239C7B56C68C43B86A0.68E22AF960C1C023033FD24D1138AFBE91CD02D3&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/x-flv&quality\u003dmedium,itag\u003d18&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=18&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=9208D71BE0BCBE4B3DF1E7B922159C3BE921FA05.2A991F268E18F480929B6A98B107468601A55535&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/mp4; codecs="avc1.42001E, mp4a.40.2"&quality\u003dmedium,itag\u003d43&url\u003dhttps://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl=yes&id=1089c9d5a380c541&itag=43&source=webdrive&app=texmex&ip=5.0.148.212&ipbits=8&expire=1455596566&sparams=requiressl,id,itag,source,ip,ipbits,expire&signature=5720BE679324A8AE30BA464F81AE61CB6A551C1.69D6E187577E285BF9C2BF0415AD929EFA212D45&key=ck2&mm=30&mn=sn-hpa7ln7k&ms=nxu&mt=1455582034&mv=m&pl=18&type\u003dvideo/webm&quality\u003dmedium"]
,["timestamp","1455582166637"]
,["length_seconds","19"]
]
]
,5,0,,,,,,,,,,1,"mp4"]
);</script>
</body>
</html>

Not spending too much time looking at your logic, I can see that you think
FirstSplit.replace(DummyTexts[0],"");
actually changes the String FirstSplit, which it doesn't. In Java Strings are immutable, so they can't change.
Replace all those lines with something like this (obviously with different indexes in DummyTexts):
FirstSplit = FirstSplit.replace(DummyTexts[0], "");
Note that this doesn't change FirstSplit, it just changes what String FirstSplit refers to, setting it to the new String being returned by the replace method. That might get you what you want, assuming the rest of that stuff works.
Ok, you say you changed to this and it still didn't work. That's probably because the FirstDecoded string you're creating is basically the fmt_stream_map line from the HTML you listed (minus a few characters at the front and back):
"fmt_stream_map","37|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d37&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d3DC24BBB45AB0C09B1633ABC215282DAD3275086.1E524A3C98B38084443AF227B4676FA122CB7191&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18,22|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d22&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d92CE58A6991267C1E6F28C23DC9C03F5CF7E0C7A.77E9DBA8D81F681587D68E2C9EF942DAA37D8461&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18,35|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d35&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d92E5A471515BC4145F258D67C6E52F7CA0FA2530.73516C4866808CD98769225F3623A93613B65F1E&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18,59|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d59&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d66DCB19D441D9742A4D21F1A08CDF488C81F728D.1864D7646337ED87C9A82951A0D524B6B3CEF451&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18,34|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d34&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d1837C0B9C77AF259371C0239C7B56C68C43B86A0.68E22AF960C1C023033FD24D1138AFBE91CD02D3&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18,18|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d18&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d9208D71BE0BCBE4B3DF1E7B922159C3BE921FA05.2A991F268E18F480929B6A98B107468601A55535&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18,43|https://r13---sn-hpa7ln7k.c.docs.google.com/videoplayback?requiressl\u003dyes&id\u003d1089c9d5a380c541&itag\u003d43&source\u003dwebdrive&app\u003dtexmex&ip\u003d5.0.148.212&ipbits\u003d8&expire\u003d1455596566&sparams\u003drequiressl,id,itag,source,ip,ipbits,expire&signature\u003d5720BE679324A8AE30BA464F81AE61CB6A551C1.69D6E187577E285BF9C2BF0415AD929EFA212D45&key\u003dck2&mm\u003d30&mn\u003dsn-hpa7ln7k&ms\u003dnxu&mt\u003d1455582034&mv\u003dm&pl\u003d18"] ,[
This doesn't have any of the strings you're looking for in it....
Ok, so now you're wondering why splitting the whole page gives you crazy results, and it's because split() takes a regex argument, not just a String. A single pipe '|' is not valid regex, use "\|" instead (escaped the special character).
https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#split(java.lang.String)

jsp: how to get value from session?

I get an String array from session and I want to show the String from the array.
I know javascript can't get data from session directly. Is there any method I can get the data from session and transfer it to javascrip?
My code as follows:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%String[] sele = (String[])session.getAttribute("selections");%>;
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="Expires" content="0">
<meta http-equiv="kiben" content="no-cache">
<title>Check List</title>
<script language="javascript" type="text/JavaScript" src="cookie.js">
</script>
<script text="text/javascript">
{
var selections = //String array form session
for(var v=0;v<selections.length;v++){
fillForm(selections[v]);
}
}
function fillForm(name){
var checkbox= document.createElement("input");
checkbox.type="checkbox";
checkbox.name=name;
checkbox.value=name;
checkbox.id=name;
var label = document.createElement("label");
label.htmlFor="id";
label.appendChild(document.createTextNode(name));
var container = document.getElementById("checklist");
container.appendChild(checkbox);
container.appendChild(label);
container.appendChild(document.createElement("br"));
}
function submitAction(){
addUserName(document.getElementById("checklist"));
var elem = document.getElementById("checklist").elements;
for(i =0;i<elem.length;i++){
elem[i].checked = true;
}
var form = document.getElementById("checklist");
form.submit();
}
</script>
</head>
<body>
<form id="checklist" action="selection">
</form>
<Button type="button" onclick="submitAction()" name="submit">Submit</button>
</body>
</html>

Simply use JSP Expression Language and JSP JSTL
<script>
alert("value: ${selections}");
</script>
Here selections is an attribute that is set in any scope page, request, session or application.
You can directly access an attribute form session scope:
{sessionScope.selections}
Note: I don't know that Java ArrayList does work in JavaScript as well. If it doesn't work then simply set a comma separated string as session attribute and split it in JavaScript as shown below.
Sample code:
<script>
var selections = "${sessionScope.csv}".split(",");
for ( var v = 0; v < selections.length; v++) {
alert(selections[v]);
}
</script>
Here csv is a comma separated string value that is set in session scope.
Use JSP JSTL and EL instead of Scriplet that is more easy to use and less error prone.
You can achieve it in JSTL without using JavaScript. Simply iterate the list using <c:forEach> tag and add that much of check boxes and labels.
Sample code:
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
...
<body>
...
<c:forEach items="${selections }" var="name">
<input type="checkbox" name="${name}" value="${name}" id="${name}">
...
</c:forEach>
</body>

How to use jsp variable in javascript array?

Hi I have a jsp page where I have some variable. I want to access the variable in a javascript array. How can I get this?
Demo.jsp
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
int i=1;
int j=2;
int k=3;
int l=4;
%>
</body>
</html>
I want to use these 4 variables in the javascript array and print them.
How can I achieve this?

Try,
<script language="JavaScript">
var Arr = new Array();
Arr[0] = '<%=i %>';
Arr[1] = '<%=j %>';
Arr[2] = '<%=k %>';
Arr[3] = '<%=l %>';
</script>

In Java script you have to use scriplet tag to use jsp data.
<%
Integet a = i ; //here i is your jsp variable
%>
In order to make this work you should declare the variable before using it (as always):
<%
String myVar="blabla";
%>
<script type="text/javascript">
foo();
function foo() {
var value = "<%=myVar%>";
alert(value);
}
</script>
Or :
var result = [];
result.push(<%i%>);
result.push(<%j%>);
result.push(<%k%>);
result.push(<%l%>);

You can access it using JSTL.
set java variable to JSTL variable
Access it in Java script as
var x='${jstl_varialbe_goes_here
}';
alert(x);

Accessing java variable from javascript on same jsp

Is it possible to access a String type variable defined in jsp from a javascript on the same page?
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1255">
<title>Insert title here</title>
<script type="text/javascript">
foo();
function foo()
{
var value = "<%=myVar%>";
alert(value);
}
</script>
</head>
<body>
<%
String myVar="blabla";
%>
</body>
</html>
In eclipse I am getting an error
myVar cannot be resolved to a variable

This won't work since you're trying to use an undefined variable. The code is generated like this:
... = myVar;
//...
String myVar = "blabla";
Doesn't make sense, right? So, in order to make this work you should declare the variable before using it (as always):
<%
String myVar="blabla";
%>
<script type="text/javascript">
foo();
function foo() {
var value = "<%=myVar%>";
alert(value);
}
</script>
Still, usage of scriptlets is extremely discouraged. Assuming you're using JSTL and Expression Language (EL), this can be rewritten to:
<c:set name="myVar" value="blabla" />
<script type="text/javascript">
foo();
function foo() {
var value = "${myVar}";
alert(value);
}
</script>
If your variable has characters like " inside, then this approach will faile. You can escape the result by using <c:out> from JSTL:
var value = "<c:out value='${myVar}' />";
More info:
How to avoid Java code in JSP files?

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