List<Student> students =newArrayList<>();for(int i =0; i <2; i++){
students.add(newStudent("admin","admin-"+i));}
String toJSONString = JSONObject.toJSONString(students);
System.out.println(toJSONString);//[{"password":"admin-0","username":"admin"},{"password":"admin-1","username":"admin"}]
JSON字符串 To Java List
List<Student> ss = JSONObject.parseArray("[{\"password\":\"admin-0\",\"username\":\"admin\"},{\"password\":\"admin-1\",\"username\":\"admin\"}]", Student.class);
System.out.println(ss);// [Student{username='admin', password='admin-0'}, Student{username='admin', password='admin-1'}]