一个学生对象如下：
班级对象
public class Grade {
private Long id;
private String name;
private List<Student> users = new ArrayList<Student>();
// 省略 setter、getter
public void addStudent(Student student) {
users.add(student);
}
@Override
public String toString() {
return "Grade{" +
"id=" + id +
", name='" + name + '\'' +
", users=" + users +
'}';
}
}
学生对象
public class Student {
private Long id;
private String name;
// 省略 setter、getter
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
运行的 Main 函数
public class MainTest {
public static void main(String[] args) {
Grade group = new Grade();
group.setId(0L);
group.setName("admin");
Student student = new Student();
student.setId(2L);
student.setName("guest");
Student rootUser = new Student();
rootUser.setId(3L);
rootUser.setName("root");
group.addStudent(student);
group.addStudent(rootUser);
// 转换为 JSON
String jsonString = JSON.toJSONString(group);
System.out.println("JSON字符串：" + jsonString);
// 转换为 对象BEAN
Grade grade = JSON.parseObject(jsonString, Grade.class);
System.out.println("JavaBean对象：" + grade);
}
}
最后的运行结果如下：
JSON字符串：
{"id":0,"name":"admin","users":[{"id":2,"name":"guest"},{"id":3,"name":"root"}]}
JavaBean对象：
Grade{id=0, name='admin', users=[Student{id=2, name='guest'}, Student{id=3, name='root'}]}