fastjsonjar包json和dto互转的例子

引入依赖
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.70</version>
</dependency>

Set<User> set = new TreeSet<User>((x,y) -> {
   return x.getAge().compareTo(y.getAge());
});
User user1 = new User("aaa",13);
User user2 = new User("bbb",34);
User user3 = new User("ccc",3);

set.add(user1);
set.add(user2);
set.add(user3);
set.forEach(user ->{
    user.setAge(9);
});

 

// DTO转json
String json = JSON.toJSONString(user1);
System.out.println("DTO转json------" + json);
// json转DTO
User user = JSON.parseObject(json, User.class);
System.out.println("json转DTO------" + user);
// 集合转json
String jsonSet = JSON.toJSONString(set);
System.out.println("集合转json------" + jsonSet);
// json转集合
List<User> userSet = JSON.parseArray(jsonSet, User.class);
System.out.println("json转集合------" + userSet);

输出结果

DTO转json------{"age":9,"name":"aaa"}
json转DTO------User(name=aaa, age=9)
集合转json------[{"age":9,"name":"ccc"},{"age":9,"name":"aaa"},{"age":9,"name":"bbb"}]
json转集合------[User(name=ccc, age=9), User(name=aaa, age=9), User(name=bbb, age=9)]