java数据类型转换____Gson框架对象和JSON转换

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package com.cnse.convert.gson;import java.util.ArrayList;import java.util.List;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;/** * @author Administrator * 使用Json的开发包 */public class GsonUtil {/** * 单个对象间的转换================================= * @param obj * @return */public static String objToJson(Object obj){Gson g = new Gson();return g.toJson(obj);}public static Object jsonToObj(Class<?> clazz, String JsonStr) throws Exception {Gson g = new Gson();Object obj = null;try {obj = g.fromJson(JsonStr, clazz);} catch (Exception e) {e.printStackTrace();}return obj;}/** * 多个对象间的转换===================================== * @param obj * @return */public static String objSToJson(Object obj){Gson g = new Gson();return g.toJson(obj);}public static List<User> getObjectS(String JsonStr) throws Exception { // json转为带泛型的list  Gson g = new Gson();        List<User> retList = g.fromJson(JsonStr,new TypeToken<List<User>>() {}.getType());  return retList;  }//==============================testpublic static void main(String[] args) throws Exception {//初始化对象User u1 = new User();u1.setUserid(1);u1.setUsername("zhangsan");u1.setPassword("123456");User u2 = new User();u2.setUserid(2);u2.setUsername("lisi");u2.setPassword("8888");List<User>list=new ArrayList<User>();list.add(u1);list.add(u2);//==========单个对象间转换System.out.println("Gson单个对象转Json串___:"+objToJson(u1));User us=(User) jsonToObj(User.class, objToJson(u1));System.out.println(us.getUsername());//=========多个对象间转换System.out.println("Gson的list<Obj>转json串__:"+objToJson(list));List<User>userlist =getObjectS(objToJson(list));System.out.println("_____"+userlist.get(0).getUsername());}}

//User对象

package com.cnse.convert.fastjson;/** * @author God * 用户对象 */public class User {//general poprivate int userid;private String username;private String password;//encappublic int getUserid() {return userid;}public void setUserid(int userid) {this.userid = userid;}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;}}

//运行结果

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