关键：ajax的dataType为jsonp，并且在请求的url中加上"?jsoncallback=?"
前台代码：
Html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" onclick="RegisterRequest2();" value="StartRequest" />
后台Servlet代码：
Java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 {
@Override
protected 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
}
@Override
protected 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。。
