使用jason需要导入的jar包

引用
引用

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(HttpServletRequest request, HttpServletResponse response)     
                throws ServletException, IOException {     
               doPost(request,response);     
        }     
        public void doPost(HttpServletRequest request, HttpServletResponse response)     
                throws ServletException, IOException {     
        
            response.setContentType("text/html");        
        String str= request.getParameter("name");//得到ajax传递过来的paramater     
            System.out.print(str);     
            PrintWriter out = response.getWriter();     
            List list = new ArrayList();//传递List     
                      Map m=new HashMap();//传递Map         
            User u1=new User();     
            u1.setUsername("zah");     
            u1.setPassword("123");     
            User u2=new User();     
            u2.setUsername("ztf");     
            u2.setPassword("456");       
            list.add(u1); //添加User对象           
             list.add(u2);     //添加User对象       
               
              m.put("u1", u1);     
             m.put("u2", u2);        
        
       JSONArray jsonArray2 = JSONArray.fromObject( list );     
           //把java数组转化成转化成json对象      
       JSONObject jo=JSONObject.fromObject(m);//转化Map对象     
            out.print(jsonArray2);//返给ajax请求     
           out.print(jo);//返给ajax请求     
        }     
    }     


    <script type="text/javascript" src="js/jquery.js"></script>     
     <script type="text/javascript">     
         function test(){     
             $.ajax({      
                    type:"POST", //请求方式     
                    url:"testjson", //请求路径     
                    cache: false,        
                    data:"name=zah",  //传参     
                    dataType: 'json',   //返回值类型     
                   success:function(json){           
                        alert(json[0].username+" " json[0].password);    //弹出返回过来的List对象     
                       }     
                    });     
          }     
    </script>     
      </head>     
      <body>     
        <input type="button" name="b" value="测试" onclick=test()>     
      </body>    

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