(json学习二)使用json需要导入的jar包_Json
《greenboy:》使用json需要导入的jar包（这个需要先了解下，避免写工程的时候，出现的问题很多，我自己调试了两个小时 哎 悲哀啊）

json-lib-2.3-jdk15.jar
commons-beanutils-1.7.0.jar
commons-httpclient-3.1.jar
commons-lang-2.3.jar
commons-logging-1.0.4.jar
commons-collections-3.1.jar
ezmorph-1.0.3.jar
这些包可以从一下地方下载：
http://commons.apache.org/index.html
http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
http://www.docjar.com/
如果不关联这些包，则会出现以下错误：
java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
java.lang.NoClassDefFoundError: org/apache/commons/codec/DecoderException
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory


package com.json;        
       
public class User {        
    String username;        
    String password;        
    public String getUsername() {        
        return username;        
    }        
    public void setUsername(String username) {        
        this.username = username;        
    }        
    public String getPassword() {        
        return password;        
    }        
    public void setPassword(String password) {        
        this.password = password;        
    }        
            
} 






package com.json;        
       
import java.io.IOException;        
import java.io.PrintWriter;        
import java.util.ArrayList;        
import java.util.List;        
       
import javax.servlet.ServletException;        
import javax.servlet.http.HttpServlet;        
import javax.servlet.http.HttpServletRequest;        
import javax.servlet.http.HttpServletResponse;        
       
import net.sf.json.JSONArray;        
       
public class TestJson extends HttpServlet {        
       
    public void doGet(Ht