jquery跨域Ajax请求

tonlion2046

关键：ajax的dataType为jsonp，并且在请求的url中加上"?jsoncallback=?"
前台代码：
<script type="text/javascript" src="jquery-1.7.2.min.js"></script> <script type="text/javascript">    function RegisterRequest2() {        /* getJSON method is ok also...         $.getJSON("http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?", { pwd: '123', username: 'tl' }, function(json) { alert(json.name); });　        */                 $.ajax({            url: "http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?",            type: "GET",            data: { pwd: '123', username: 'tl' },            dataType: "jsonp",            success: function(data) {                alert(data.name);            },            error: function(a, b, c) {                alert("error==" + b);            }        });     }  </script><input type="button"   value="StartRequest" /> 
后台Servlet代码：
import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Rigister extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException { String pwd = req.getParameter("pwd");String username =req.getParameter("username");System.out.println("get=="+username+"  ==="+pwd); String callback = req.getParameter("jsoncallback"); resp.getWriter().write(callback + "({name:'tzy',phone:'123'})"); //参数为json格式}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException { String pwd = req.getParameter("pwd");String username =req.getParameter("username");System.out.println("post=="+username+"  ==="+pwd); String callback = req.getParameter("jsoncallback"); resp.getWriter().write(callback + "({name:'tzy',phone:'123'})"); }} 
后台返回前台的时候取出jsoncallback回调函数名，将json格式的数据作为函数的参数，整个以字符串的形式返回给前台。。