List集合转String、String转List集合

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

People people1 = new People("小范", 1, 23);
 People people2 = new People("小张", 1, 26);
 People people3 = new People("小顾", 2, 25);
 List<People> list = new ArrayList<>();
 list.add(people1);
 list.add(people2);
 list.add(people3);
 System.out.println("原装List：" + list);
 System.out.println("================================");

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("=================================");

String转List集合

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

输出结果：

原装List：[People{
          
   name=小范, sex=1, year=23}, People{
          
   name=小张, sex=1, year=26}, People{
          
   name=小顾, sex=2, year=25}]
===========================================
List转String结果：[{
          
   "name":"小范","sex":1,"year":23},{
          
   "name":"小张","sex":1,"year":26},{
          
   "name":"小顾","sex":2,"year":25}]
===========================================
String转List结果：[People{
          
   name=小范, sex=1, year=23}, People{
          
   name=小张, sex=1, year=26}, People{
          
   name=小顾, sex=2, year=25}]