JSP中获取ExtJS.Ajax前台传递的JSON数据

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>    <%@ page import="java.io.BufferedReader" %>    <%@ page import="net.sf.json.*" %> <%  BufferedReader in=request.getReader(); StringBuffer jsonStr=new StringBuffer(); String str=""; while((str=in.readLine())!=null){ jsonStr.append(str); }  JSONObject jsonObj= JSONObject.fromObject(jsonStr.toString()); String name= jsonObj.getString("userName"); String pwd= jsonObj.getString("passWord"); String msg=""; if(name.equals("Tom")){ msg="登录成功"; }else { msg="登录失败"; }  response.getWriter().write(msg);   %>

必须的数据包：

1.commons-lang.jar

2.commons-beanutils.jar

3.commons-collections.jar

4.commons-logging.jar

5.ezmorph.jar

6.json-lib-2.2.2-jdk15.jar

否则JSONObject 报错，并且不能接收。