Ajax通过servlet对剩余服务的调用

Question

I have a little problem: I'm developing a jQuery Mobile app and i need to make an ajax post call to a rest service. I create the pages dynamically using servlets.

I tried to make the ajax call to the rest url:

http://localhost:8181/myRestServicePath/func?key=value

from a page whit the following url:

http://localhost:8080/Mypage

but i get a cross-orign error from the browser.

So i'm tryng to perform this call, passing through a Java servlet using the doPost() method.

Now, my intent is to make an ajax post call from

 http://localhost:8080/Mypage

to:

 http://localhost:8080/myServletPath/func?key=value

and this servlet should redirect the POST request to my RestService:

http://localhost:8181/myRestServicePath/func?key=value

How can i perform this redirection?

Answer 1

There could be several ways to achieve that. I am just sharing 2 commons possibilities as below.

For POST requests:- You will need to use Apache HTTPClient in your servlet to send the request to web services and get a response. After getting the response you can send that response to your page.

For GET Requests:-

You don't need extra servlet for cross domain request. You can use JSONP

jQuery example:

$.ajax({
     url:"http://localhost:8080/myServletPath/func?key=value",
     dataType: 'jsonp', // Notice! JSONP <-- P (lowercase)
     success:function(json){
         // do stuff with json (in this case an array)
         alert("Success");
     },
     error:function(){
         alert("Error");
     },
});

For back end example visit Java J2EE Tutorial for Cross Domain JSONP