java JSON 執行個體

package Test;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import net.sf.json.JSONObject;import net.sf.json.JSONSerializer;import net.sf.json.JsonConfig;public class Jtest {public static void main(String[] args) {HashMap<String, String> hm = new HashMap<String, String>();hm.put("aa", "123aa");hm.put("bb", "123bb");hm.put("cc", "123cc");User user = new User();user.setUsername("hewei");user.setPassword("123");List<User> ul = new ArrayList<User>();ul.add(user);//JSONArray jsona = JSONArray.fromObject("['aa','bb','<q>']");//JSONObject jsono = JSONObject.fromObject(new User());  //json 轉 實體類JSONObject jsonobject = JSONObject.fromObject("{username:'xx',password:'yy'}");JsonConfig jsonConfig = new JsonConfig();jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );jsonConfig.setRootClass(User.class);User user2 = (User) JSONSerializer.toJava(jsonobject,jsonConfig);System.out.println(user2.getUsername()+"  "+user2.getPassword());  //實體類轉 jsonJSONObject jsonobject2 = JSONObject.fromObject(user);System.out.println(jsonobject2.toString());}} package Test; public class User  {private String username;private 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;}}