Gson简要使用笔记

 1 package com.tuzi.gson.domain;
 2 
 3 public class Student {
 4 
 5     private int id;
 6     private String name;
 7     private int age;
 8 
 9     public Student(int id, String name, int age) {
10         super();
11         this.id = id;
12         this.name = name;
13         this.age = age;
14     }
15 
16     public int getId() {
17         return id;
18     }
19 
20     public void setId(int id) {
21         this.id = id;
22     }
23 
24     public String getName() {
25         return name;
26     }
27 
28     public void setName(String name) {
29         this.name = name;
30     }
31 
32     public int getAge() {
33         return age;
34     }
35 
36     public void setAge(int age) {
37         this.age = age;
38     }
39 
40     @Override
41     public String toString() {
42         return "Student [age=" + age + ", id=" + id + ", name=" + name + "]";
43     }
44 
45 }

 1 package com.tuzi.gson.test;
 2 
 3 import java.util.ArrayList;
 4 import java.util.HashMap;
 5 import java.util.List;
 6 import java.util.Map;
 7 
 8 import com.google.gson.Gson;
 9 import com.google.gson.reflect.TypeToken;
10 import com.tuzi.gson.domain.Student;
11 
12 public class GsonTest {
13     
14     public static void main(String[] args) {
15         
16         //普通对象转换成json
17         Student student1=new Student(1, "tuzi", 22);
18         Gson gson=new Gson();//实例化一个Gson对象
19         String info1=gson.toJson(student1);
20         System.out.println("普通对象转换成json："+info1);
21         
22         //json反序列化（info1）
23         Student student2=gson.fromJson(info1, Student.class);
24         System.out.println("json字符串反序列化："+student2.toString());
25         System.out.println();
26         
27         
28         
29         //list集合(Student)对象转换成json
30         List<Student> list=new ArrayList<Student>();
31         Student student3=new Student(3, "xiaoming", 22);
32         Student student4=new Student(4, "xiaofang", 22);
33         list.add(student3);
34         list.add(student4);
35         String info2=gson.toJson(list);
36         System.out.println("list集合(Student)对象转换成json："+info2);
37         
38         //json反序列化（info2）
39         List<Student> students=gson.fromJson(info2,new TypeToken<List<Student>>(){}.getType());//TypeToken是Google提供的一个解析Json数据的类库中一个类(任意类型)
40         System.out.println("json字符串反序列化："+students.toString());
41         System.out.println();
42         
43         
44         //list集合(Map)对象转换成json
45         List<Map<String,Object>> list2=new ArrayList<Map<String,Object>>();
46         Map<String,Object> map1=new HashMap<String, Object>();
47         map1.put("id", 5);
48         map1.put("name", "小白");
49         map1.put("age", 11);
50         
51         Map<String,Object> map2=new HashMap<String, Object>();
52         map2.put("id", 5);
53         map2.put("name", "小黑");
54         map2.put("age", 13);
55         
56         list2.add(map1);
57         list2.add(map2);
58         
59         String info3=gson.toJson(list2);
60         System.out.println("list集合(Map)对象转换成json："+info3.toString());
61         
62         //json反序列化（info2）
63         List<Map<String,Object>> list4=gson.fromJson(info3, new TypeToken<List<Map<String,Object>>>(){}.getType());
64         System.out.println("json字符串反序列化："+list4.toString());
65         
66     }
67     
68 
69 }