使用谷歌的Gson进行字符串和json对象之间的转换，是很方便的，本文讲解如何使用Gson将json格式的字符串转换为json对象

1、先创建实体类

		package com.che.pri.bean;
		
		public class User {
			
			private String name;
			
			private String code;
		
			public String getName() {
				return name;
			}
		
			public void setName(String name) {
				this.name = name;
			}
		
			public String getCode() {
				return code;
			}
		
			public void setCode(String code) {
				this.code = code;
			}
		
			@Override
			public String toString() {
				return "User [name=" + name + ", code=" + code + "]";
			}
		}

2、进行list和Json之间的转换

	package com.che.pri.json;
	
	import java.lang.reflect.Type;
	import java.util.ArrayList;
	import java.util.List;
	import com.che.pri.bean.User;
	import com.google.gson.Gson;
	import com.google.gson.reflect.TypeToken;
	
	public class ListToJson {
		
		public static void main(String[] args) {
			List<User> list = new ArrayList<User>();
			
			User user1 = new User();
			user1.setCode("001");
			user1.setName("李逵");
			list.add(user1);
			
			User user2 = new User();
			user2.setCode("001");
			user2.setName("宋江");
			list.add(user2);
			
			User user3 = new User();
			user3.setCode("001");
			user3.setName("张飞");
			list.add(user3);
			
			User user4 = new User();
			user4.setCode("001");
			user4.setName("赵云");
			list.add(user4);
			//以上代码创建list对象
			
			//将list转换为json格式字符串
			String json = new Gson().toJson(list);
			System.out.println(json);
			//[{"name":"李逵","code":"001"},{"name":"宋江","code":"001"},{"name":"张飞","code":"001"},{"name":"赵云","code":"001"}]
			
			
			//将json格式字符串转换为List对象
			Type type = new TypeToken<List<User>>() {}.getType();
			List<User> userLists = new Gson().fromJson(json, type);
			System.out.println(userLists);
			//[User [name=李逵, code=001], User [name=宋江, code=001], User [name=张飞, code=001], User [name=赵云, code=001]]
		}
	
	}

3、总结

通过new Gson().toJson(list)方法，将list对象转换为Json格式字符串

通过Type type = new TypeToken<List<User>>() {}.getType();List<User> userLists = new Gson().fromJson(json, type)方法将Json格式字符串转换为List对象