Gson解析精讲
2017-08-24 11:05
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gson属于第三方依赖，使用前要添加依赖包
在APPbuild.gradle的dependencies中添加
依赖和混淆可根据GitHub官网版本自行更新
要求: 如果是{} 直接创建类 将json串中的key作为属性 单词必须和key保持一致（name：“zhangsan”,这里的name就是key，我们管张三叫做value）
new Gson().fromJson(源数据,类.class)
1入门
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3有数组的处理方式
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5练习
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在APPbuild.gradle的dependencies中添加
compile 'com.google.code.gson:gson:2.3.1'
并刷新项目（Sync）
使用gson，必须先添加混淆。
# Gson 代码混淆
-keepattributes Signature
-keepattributes *Annotation*
-keep class sun.misc.Unsafe { *; }
-keep class com.daiba.wsjr.bean.** { *; }依赖和混淆可根据GitHub官网版本自行更新
要求: 如果是{} 直接创建类 将json串中的key作为属性 单词必须和key保持一致（name：“zhangsan”,这里的name就是key，我们管张三叫做value）
new Gson().fromJson(源数据,类.class)
1入门
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public class Test {23public static void main(String[] args) {45String json = "{name:'zhangsan',age:20,sex:'男'}";67Gson gson = new Gson();8
// 参数一: 想要解析的数据源9
// 参数二 : 解析以后 要放置到的对象的类型10
Person person = gson.fromJson(json, Person.class);1112
//Person person2 = new Gson().fromJson(json, Person.class);13
System.out.println(person);14
}15
}1617
class Person{18// 属性名的名字必须和 json字符串中键的名字必须保持一致19
String name ;20
int age;21
String sex;22
public String getName() {23return name;24
}25
public void setName(String name) {26this.name = name;27
}28
public int getAge() {29return age;30
}31
public void setAge(int age) {32this.age = age;33
}34
public String getSex() {35return sex;36
}37
public void setSex(String sex) {38this.sex = sex;39
}40
@Override41
public String toString() {42return "Person [name=" + name + ", age=" + age + ", sex=" + sex + "]";43
}44
public Person(String name, int age, String sex) {45super();46
this.name = name;47
this.age = age;48
this.sex = sex;49
}50
public Person() {51super();52
}535455
}2类套类
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public class Test2 {2
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public static void main(String[] args) {4
String json= "{name:'tom',age:24,dept:{no:1,deptname:'android开发部'}}";5
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Person2 person2 = new Gson().fromJson(json, Person2.class);
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System.out.println(person2);
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}
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}
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class Person2{12
String name;
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int age;
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Dept dept;
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public Person2(String name, int age, Dept dept) {16
super();
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this.name = name;
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this.age = age;
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this.dept = dept;
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}
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public Person2() {22
super();
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}
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@Override
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public String toString() {26
return "Person2 [name=" + name + ", age=" + age + ", dept=" + dept + "]";
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}
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public String getName() {29
return name;
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}
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public void setName(String name) {32
this.name = name;
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}
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public int getAge() {35
return age;
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}
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public void setAge(int age) {38
this.age = age;
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}
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public Dept getDept() {41
return dept;
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}
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public void setDept(Dept dept) {44
this.dept = dept;
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}
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}
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class Dept{51
int no;
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String deptname;
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@Override
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public String toString() {55
return "Dept [no=" + no + ", deptname=" + deptname + "]";
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}
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public int getNo() {58
return no;
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}
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public void setNo(int no) {61
this.no = no;
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}
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public String getDeptname() {64
return deptname;
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}
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public void setDeptname(String deptname) {67
this.deptname = deptname;
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}
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public Dept(int no, String deptname) {70
super();
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this.no = no;
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this.deptname = deptname;
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}
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public Dept() {75
super();
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}
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}
3有数组的处理方式
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public class Test3 {23public static void main(String[] args) {4String json="{no:1,name:'android',employees:[{name:'tom',age:23},{name:'jerry',age:25},{name:'rose',age:25},{name:'jack',age:27}]}";56Deptment deptment = new Gson().fromJson(json, Deptment.class);7
System.out.println(deptment);89
}10
}11
class Deptment{12int no;13
String name;14
// 对象中包含数组 创建类的时候 数组要以一个集合的形式存在于 外边的类中 作为一个属性15
List<Person3> employees;16
public int getNo() {17return no;18
}19
public void setNo(int no) {20this.no = no;21
}22
public String getName() {23return name;24
}25
public void setName(String name) {26this.name = name;27
}28
public List<Person3> getEmployees() {29return employees;30
}31
public void setEmployees(List<Person3> employees) {32this.employees = employees;33
}34
@Override35
public String toString() {36return "Deptment [no=" + no + ", name=" + name + ", employees=" + employees + "]";37
}38
public Deptment(int no, String name, List<Person3> employees) {39super();40
this.no = no;41
this.name = name;42
this.employees = employees;43
}44454647
}4849
class Person3{50String name;51
int age;52
public String getName() {53return name;54
}55
public void setName(String name) {56this.name = name;57
}58
public int getAge() {59return age;60
}61
public void setAge(int age) {62this.age = age;63
}64
public Person3(String name, int age) {65super();66
this.name = name;67
this.age = age;68
}69
public Person3() {70super();71
// TODO Auto-generated constructor stub72
}73
@Override74
public String toString() {75return "Person3 [name=" + name + ", age=" + age + "]";76
}7778
}4一个大数组
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public class Test4 {2
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public static void main(String[] args) {4
String json="[{name:'tom',age:23},{name:'jerry',age:25},{name:'rose',age:25},{name:'jack',age:27}]";5
// 想要得到list集合的类型
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Type type = new TypeToken<List<Person4>>(){}.getType();7
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List<Person4> list = new Gson().fromJson(json, type);
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System.out.println(list);
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}
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}
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class Person4{15
String name;
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int age;
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@Override
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public String toString() {19
return "Person4 [name=" + name + ", age=" + age + "]";
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}
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public Person4(String name, int age) {22
super();
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this.name = name;
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this.age = age;
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}
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public Person4() {27
super();
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}
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public String getName() {30
return name;
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}
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public void setName(String name) {33
this.name = name;
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}
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public int getAge() {36
return age;
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}
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public void setAge(int age) {39
this.age = age;
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}
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}
5练习
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public class Test5 {2
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public static void main(String[] args) throws IOException {4
String path = "http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=1";
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String json = HttpUtil.getString(path);
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// 解析
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Menu menu = new Gson().fromJson(json, Menu.class);
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System.out.println(menu);
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for (int i = 0; i < menu.getData().size(); i++) {14
String pic = menu.getData().get(i).getPic();
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byte[] bs = HttpUtil.getBytes(pic);
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FileOutputStream fos = new FileOutputStream(new File(i+".jpg"));
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fos.write(bs);
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fos.flush();
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if(fos!=null){20
fos.close();
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}
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System.out.println("下载完"+i+".jpg");23
}
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}
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}
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class Menu{28
int ret;
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List<Data> data;
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public int getRet() {31
return ret;
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}
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public void setRet(int ret) {34
this.ret = ret;
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}
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public List<Data> getData() {37
return data;
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}
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public void setData(List<Data> data) {40
this.data = data;
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}
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public Menu(int ret, List<Data> data) {43
super();
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this.ret = ret;
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this.data = data;
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}
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@Override
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public String toString() {49
return "Menu [ret=" + ret + ", data=" + data + "]";
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}
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public Menu() {52
super();
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}
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}
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class Data{59
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String id;
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String title;
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String pic;
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String collect_num;
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String food_str;
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String num;
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public Data(String id, String title, String pic, String collect_num, String food_str, String num) {67
super();
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this.id = id;
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this.title = title;
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this.pic = pic;
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this.collect_num = collect_num;
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this.food_str = food_str;
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this.num = num;
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}
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public Data() {76
super();
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}
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@Override
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public String toString() {80
return "Data [id=" + id + ", title=" + title + ", pic=" + pic + ", collect_num=" + collect_num + ", food_str="
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+ food_str + ", num=" + num + "]";
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}
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public String getId() {84
return id;
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}
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public void setId(String id) {87
this.id = id;
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}
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public String getTitle() {90
return title;
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}
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public void setTitle(String title) {93
this.title = title;
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}
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public String getPic() {96
return pic;
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}
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public void setPic(String pic) {99
this.pic = pic;
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}
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public String getCollect_num() {102
return collect_num;
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}
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public void setCollect_num(String collect_num) {105
this.collect_num = collect_num;
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}
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public String getFood_str() {108
return food_str;
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}
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public void setFood_str(String food_str) {111
this.food_str = food_str;
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}
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public String getNum() {114
return num;
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}
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public void setNum(String num) {117
this.num = num;
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}
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}
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