Gson操作json

github:https://github.com/google/gson

API:http://google.github.io/gson/apidocs/

示例对象

 1 package present;
 2
 3 public class School {
 4     private int id;
 5
 6     public int getId() {
 7         return id;
 8     }
 9
10     private Address address;
11
12     public Address getAddress() {
13         return address;
14     }
15
16     public void setAddress(Address address) {
17         this.address = address;
18     }
19
20     private Student[] students;
21
22     public Student[] getStudents() {
23         return students;
24     }
25
26     public void setStudents(Student[] students) {
27         this.students = students;
28     }
29
30     public School(int id) {
31         this.id = id;
32     }
33
34 }

 1 package present;
 2
 3 public class Student {
 4     private String name;
 5     private int age;
 6
 7     public String getName() {
 8         return name;
 9     }
10     public void setName(String name) {
11         this.name=name;
12     }
13
14     public int getAge() {
15         return this.age;
16     }
17
18     public void setAge(int age) {
19          this.age=age;
20     }
21 }

 1 package present;
 2
 3 public class Address {
 4     private String number;
 5
 6     private String street;
 7
 8     public String getStreet() {
 9         return street;
10     }
11
12     public void setStreet(String street) {
13         this.street = street;
14     }
15
16     public String getNumber() {
17         return number;
18     }
19
20     public void setNumber(String number) {
21         this.number = number;
22     }
23
24 }

 1         School school = new School(10001);
 2         Address address = new Address();
 3         address.setNumber("8000");
 4         address.setStreet("山大路解放街");
 5         school.setAddress(address);
 6         Student[] students = new Student[3];
 7         for (int i = 0; i < students.length; i++) {
 8             Student student = new Student();
 9             student.setAge(i + 10);
10             student.setName("学生" + i);
11             students[i] = student;
12         }
13         school.setStudents(students);

对象转json串

        Gson gson = new Gson();
        String json = gson.toJson(school);
        System.out.println(json);

json串转对象

 School result = gson.fromJson(json, School.class);