(json学习二)使用json需要导入的jar包_Json

greenboy1 · 发表于 2013-1-29 10:45:32

《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(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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