So I am pretty new to Spring and the whole MVC structure. Currently we work with tomcat server and another layer that we call a "service" layer. I am confused on how the tomcat layer communicates with the service layer.
So for example: Lets say I am validating passwords for users. So the idea would be that it would first be validated on the UI side aka the tomcat side via javascript and after that these values would pass over to the service layer where the most of the back-end logic lies and the values would be validated by Java. So my question is how exactly are these values passed from the UI end to the back-end layer?
This would be good start for you: Spring: Serving Web Content with Spring MVC
Once you have a backend service created, your frontend will call the service as a REST endpoint, values will be passed as GET or POST request with the request to this backend service
How to display Backend data using AngularJS in Java web Application.
Do I need to use RESTfull Web Services.
If I don't want to use RESTfull web services, then how should I proceed.
(In my java web application m using Spring and Hibernate.)
AngularJS is a framework used to develop single page web applications which doesn't need refreshing and will act like a mobile application.
For this purpose, all the data required by the front end needs to come from some sort of a backend API. REST is widely used for this purpose in many leading high scale websites like twitter/facebook etc.
You should develop your Java Web Application as an API without no/less HTML pages and use that in your AngularJS front end.
RESTfull web services provide and easy way to integrate your AngularJS frond end with database. It is the most popular one. But it is not the only one.
You can also achieve this via different techniques.
All you need is to make call to a server technology that returns a JSON object.
That particular server technology (even a simple JSP/Servlet) can interact with database and return the expected data in JSON format.
This link provides a simple example to help you begin with.
I am developing banking mobile apps using html5 for client as communicate back-end system they provided soap based xml services.
To make a soap request, i doesn't want to write code in ".js" file because of code complexity and not found request and response logs in production phases.
now i want to make separate project to maintain the web-service request and response business logic using java?
from .js, I want to make a http request to call the web service as a response i want to get json an object?.
Please correct me if i was wrong, Please help me how to separate web service logic into a single project?
Note: I doesn't want to configure my soap request through js file.
Regards,
nag
Write a servlet or httphandler(if IIS) that interacts with SOAP services and parses the information and creates a json response for the JS client.
You JS client interacts with servlet/httphandler and handles when it json response when it receives it.
Can someone please let me know if we can use Restful web services or something similar to that to service HTTP requests without using a web server
All the Http requests are processed or identified by the servlet or ejb component in java.
1.We must deploy restful services server side code in webserver otherwise we cannot expose our functionality over the network
2.To access the rest resource we can use normal java program or any servlet or other.
3.Without using webserver you cannot expose your rest resource over the network at serverside.
This question already has answers here:
SOAP vs REST (differences)
(13 answers)
Closed 5 years ago.
For now I have a slight idea about the differences between SOAP and RESTful services.
My question is when I should use SOAP, and when I should use RESTful; which one is "better" when it comes to performance/speed or request handling?
I'm implementing it for the first time in RESTful (Java) and I want know more about it; I've dealt with SOAP before.
This is a follow-up question to this post.
REST is almost always going to be faster. The main advantage of SOAP is that it provides a mechanism for services to describe themselves to clients, and to advertise their existence.
REST is much more lightweight and can be implemented using almost any tool, leading to lower bandwidth and shorter learning curve. However, the clients have to know what to send and what to expect.
In general, When you're publishing an API to the outside world that is either complex or likely to change, SOAP will be more useful. Other than that, REST is usually the better option.
REST vs. SOAP Web Services
I am seeing a lot of new web services are implemented using a REST
style architecture these days rather than a SOAP one. Lets step back a
second and explain what REST is.
What is a REST web service?
The acronym REST stands for representational state transfer, and this
basically means that each unique URL is a representation of some
object. You can get the contents of that object using an HTTP GET, to
delete it, you then might use a POST, PUT, or DELETE to modify the
object (in practice most of the services use a POST for this).
Who's using REST?
All of Yahoo's web services use REST, including Flickr and Delicious.
APIs use it, pubsub, bloglines, Technorati, and both eBay, and Amazon
have web services for both REST and SOAP.
Who's using SOAP?
Google seams to be consistent in implementing their web services to
use SOAP, with the exception of Blogger, which uses XML-RPC. You will
find SOAP web services in lots of enterprise software as well.
REST vs. SOAP
As you may have noticed the companies I mentioned that are using REST
APIs haven't been around for very long, and their APIs came out this
year mostly. So REST is definitely the trendy way to create a web
service, if creating web services could ever be trendy (lets face it
you use soap to wash, and you rest when your tired). The main
advantages of REST web services are:
Lightweight - not a lot of extra XML markup Human Readable Results
Easy to build - no toolkits required. SOAP also has some advantages:
Easy to consume - sometimes Rigid - type checking, adheres to a
contract Development tools For consuming web services, its sometimes a
toss up between which is easier. For instance Google's AdWords web
service is really hard to consume (in ColdFusion anyway), it uses SOAP
headers, and a number of other things that make it kind of difficult.
On the converse, Amazon's REST web service can sometimes be tricky to
parse because it can be highly nested, and the result schema can vary
quite a bit based on what you search for.
Whichever architecture you choose make sure its easy for developers
to access it, and well documented.
Freitag, P. (2005). "REST vs SOAP Web Services". Retrieved from http://www.petefreitag.com/item/431.cfm on June 13, 2010
SOAP
Simple Object Access Protocol (SOAP) is a standard, an XML language, defining a message architecture and message formats. It is used by Web services. It contains a description of the operations.
WSDL is an XML-based language for describing Web services and how to access them. It will run on SMTP, HTTP, FTP, etc. It requires middleware support and well-defined mechanism to define services like WSDL+XSD and WS-Policy.
SOAP will return XML based data
REST
Representational State Transfer (RESTful) web services. They are second-generation Web services.
RESTful web services communicate via HTTP rather than SOAP-based services and do not require XML messages or WSDL service-API definitions. For REST middleware is not required, only HTTP support is needed. It is a WADL standard, REST can return XML, plain text, JSON, HTML, etc.
REST is an architecture.
REST will give human-readable results.
REST is stateless.
REST services are easily cacheable.
SOAP is a protocol. It can run on top of JMS, FTP, and HTTP.
REST has no WSDL (Web Description Language) interface definition.
REST is over HTTP, but SOAP can be over any transport protocols such as HTTP, FTP, SMTP, JMS, etc.
REST stands for representational state transfer whereas SOAP stands for Simple Object Access Protocol.
SOAP defines its own security where as REST inherits security from the underlying transport.
SOAP does not support error handling, but REST has built-in error handling.
REST is lightweight and does not require XML parsing. REST can be consumed by any client, even a web browser with Ajax and JavaScript. REST consumes less bandwidth, it does not require a SOAP header for every message.
REST is useful over any protocol which provide a URI. Ignore point 5 for REST as mentioned below in the picture.
REST vs. SOAP
SOAP:
► SOAP is simple object access protocol that run on TCP/UDP/SMTP.
► SOAP read and write request response messages in XML format.
► SOAP uses interface in order to define the services.
► SOAP is more secure as it has its own security and well defined standards.
► SOAP follows RPC and Document style to define web services.
► SOAP uses SOAP-UI as client tools for testing.
REST
► REST is representational state transfer that uses underlying HTTP protocols.
► REST is stateless.
► REST is an architectural style that is used to describe and define web services.
► REST can read and write request response messages in JSON/XML/Plain HTML.
► REST uses URI for each resource that is used in web service.A resource can be image text method etc.
► REST uses set of verbs, like HTTP's GET, POST, PUT, DELETE.
► REST is easy to develop and easy to manage as compared to SOAP UI.
► REST has light-weight client tools or plugins that can easily be integrated inside a browser.
► REST services are cacheable.
Difference between REST and SOAP:
SOAP Web services:
If your application needs a guaranteed level of reliability and security then SOAP offers additional standards to ensure this type of operation.
If both sides (service provider and service consumer) have to agree on the exchange format then SOAP gives the rigid specifications for this type of interaction.
RestWeb services:
Totally stateless operations: for stateless CRUD (Create, Read, Update, and Delete) operations.
Caching situations: If the information needs to be cached.
SOAP web service always make a POST operation whereas using REST you can choose specific HTTP methods like GET, POST, PUT, and DELETE.
Example: to get an item using SOAP you should create a request XML, but in the case of REST you can just specify the item id in the URL itself.
REST is easier to use for the most part and is more flexible. Unlike SOAP, REST doesn’t have to use XML to provide the response. We can find REST-based Web services that output the data in the Command Separated Value (CSV), JavaScript Object Notation (JSON) and Really Simple Syndication (RSS) formats.
We can obtain the output we need in a form that’s easy to parse within the language we need for our application.REST is more efficient (use smaller message formats), fast and closer to other Web technologies in design philosophy.