课程地址：https://www.imooc.com/learn/523
Gson是google开发的一个开源Json解析库，最新版本以及源码可以在官方的github上查看：https://github.com/google/gson
Maven依赖
1
2
3
4
5
| <dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
</dependency>
|
创建javaBean
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
| package bean;
import com.google.gson.annotations.SerializedName;
import java.util.Arrays;
public class Diaosi {
private String name;
private String school;
private boolean has_girlfriend;
private double age;
private Object car;
private Object house;
private String[] major;
private String comment;
private String birthday;
private transient String ignore;
public String getIgnore() {
return ignore;
}
public void setIgnore(String ignore) {
this.ignore = ignore;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
public boolean isHas_girlfriend() {
return has_girlfriend;
}
public void setHas_girlfriend(boolean has_girlfriend) {
this.has_girlfriend = has_girlfriend;
}
public double getAge() {
return age;
}
public void setAge(double age) {
this.age = age;
}
public Object getCar() {
return car;
}
public void setCar(Object car) {
this.car = car;
}
public Object getHouse() {
return house;
}
public void setHouse(Object house) {
this.house = house;
}
public String[] getMajor() {
return major;
}
public void setMajor(String[] major) {
this.major = major;
}
public String getComment() {
return comment;
}
public void setComment(String comment) {
this.comment = comment;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "Diaosi{" +
"name='" + name + '\'' +
", school='" + school + '\'' +
", has_girlfriend=" + has_girlfriend +
", age=" + age +
", car=" + car +
", house=" + house +
", major=" + Arrays.toString(major) +
", comment='" + comment + '\'' +
", birthday='" + birthday + '\'' +
'}';
}
}
|
ps:关键字 transient 如果用transient声明一个实例变量，当对象存储时，它的值不需要维持。换句话来说就是，用transient关键字标记的成员变量不参与序列化过程。
生成json
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
| package gson;
import bean.Diaosi;
import com.google.gson.FieldNamingStrategy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.lang.reflect.Field;
public class GsonCreateSample {
public static void main(String[] args) {
Diaosi diaosi = new Diaosi();
diaosi.setName("wfk");
diaosi.setAge(25.2);
diaosi.setBirthday("1996-07-01");
diaosi.setSchool("蓝翔");
diaosi.setMajor(new String[] {"理发", "挖掘机"});
diaosi.setHas_girlfriend(true);
diaosi.setCar(null);
diaosi.setHouse(null);
diaosi.setComment("这是一个注释1");
diaosi.setIgnore("忽略这条属性");
Gson gson = new Gson();
System.out.println(gson.toJson(diaosi));
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.setPrettyPrinting();
gsonBuilder.setFieldNamingStrategy(new FieldNamingStrategy() {
@Override
public String translateName(Field field) {
if (field.getName().equals("name")) {
return "NAME";
}
return field.getName();
}
});
Gson gson1 = gsonBuilder.create();
System.out.println(gson1.toJson(diaosi));
}
}
|