java 转json

commons-beanutils-1.8.0.jar不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
commons-collections.jar 不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap
commons-lang-2.4.jar不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
commons-logging-1.1.1.jar不加这个包
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
ezmorph-1.0.4.jar不加这个包
java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher
json-lib-2.3-jdk15.jar不加这个包
java.lang.NoClassDefFoundError: net/sf/json/JSONObject
在Java中加上这几个包
实例：
import java.io.IOException;
import java.util.ArrayList;
import java.sql.Date;
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;
import net.sf.json.JSONObject;
import aa.JsonBean2;
public class main extends HttpServlet {
 
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  
  List list = new ArrayList();
  JsonBean2 jb1 = new JsonBean2();
  jb1.setA(1);
  jb1.setB("丁龙飞");
  System.out.println("*****123");
  Date c=new Date(100,9,10);
  String s=c.toString();
  System.out.println(s+"33333");
  jb1.setC(s);
  JsonBean2 jb2 = new JsonBean2();
  jb2.setA(1);
  jb2.setB("b");
  jb2.setC(s);
  list.add(jb1);
  list.add(jb2);
  JSONObject obj= JSONObject.fromObject(jb1);
  System.out.println(obj.toString()+"*****123");
  JSONArray ja = JSONArray.fromObject(list);
  System.out.println(ja.toString()+"-------------");