list<对象> 集合 和 String 互转

maven 项目

首先导入alibaba的jar包

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.54</version>
</dependency>

构建集合对象

 User user = new User("小陈", 1, 25);
 User user1 = new User("小杨", 1, 26);
 List<User> list = new ArrayList<>();
 list.add(user);
 list.add(user1);
 System.out.println("原装List：" + list);
 System.out.println("================================");

原装List：[User{name='小陈', sex=1, year=25}, People{name='小杨', sex=1, year=26}]

list集合转String

/**
 *List转string
 */
 String listToString = JSON.toJSONString(list);
 System.out.println("List转String结果：" + listToString);
 System.out.println("=================================");

List转String结果：[{"name":"小陈","sex":1,"year":25},{"name":"小杨","sex":1,"year":26}]

String转回list集合

    /**
     *String转List
     */
     List<User> stringToList = JSON.parseArray(listToString, User.class);
 　　System.out.println("String转List结果：" + stringToList);

　　String转List结果：[User{name='小陈', sex=1, year=25}, People{name='小杨', sex=1, year=26}]