The JSON data implementation process delivered by the ExtJS.Ajax foreground is obtained in JSP

 
<%@ 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=" Login successful "; 
}else 
{ 
msg=" Login failed "; 
} 
response.getWriter().write(msg); 
%> 

The specific process of receiving JSON data.
Required packets:
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
Otherwise JSONObject reports an error and cannot receive.