（android学习）使用Gson解析json

使用Gson解析json格式的数据

一、添加依赖：

compile 'com.google.code.gson:gson:2.8.1'

二、Gson的简单使用

1.新建一个实体类（person）

public class Person {

private String name;

private int age;

private String sex;

private String tel;

public Person(String name, int age, String sex, String tel) {

this.name = name;

this.age = age;

this.sex = sex;

this.tel = tel;

}

2.添加数据源（person对象）

public class MainActivity extends AppCompatActivity {

private static final String TAG = "MainActivity";

private List<Person> Data;

private List<Person> newData;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Person person1 = new Person("Jim",24,"boy","123456789");

Person person2 = new Person("Jane",25,"girl","897654321");

Person person3 = new Person("Tom",24,"boy","564789123");

Person person4 = new Person("Jack",23,"boy","0123456926");

Person person5 = new Person("lucy",27,"boy","98156123156");

Data = new ArrayList<>();

Data.add(person1);

Data.add(person2);

Data.add(person3);

Data.add(person4);

Data.add(person5);

3.Gson的使用

String jsonString = new Gson().toJson(Data);  //将存有person对象的list转为json格式的数据

Log.d(TAG, "onCreate: jsonString = " + jsonString);

newData = new Gson().fromJson(jsonString,new TypeToken<List<Person>>(){}.getType() );

//将json格式数据解析为person对象list，打印出log

for (Person person:newData) {

Log.d(TAG, "onCreate: \nname:" + person.getName() + "\n age:" + person.getAge()

+ "\n sex:" + person.getSex() + "\n tel:" + person.getTel());

}

}

}

输出结果如下：

MainActivity: onCreate: jsonString = [{"age":24,"name":"Jim","sex":"boy","tel":"123456789"},{"age":25,"name":"Jane","sex":"girl","tel":"897654321"},{"age":24,"name":"Tom","sex":"boy","tel":"564789123"},{"age":23,"name":"Jack","sex":"boy","tel":"0123456926"},{"age":27,"name":"lucy","sex":"boy","tel":"98156123156"}]

Gson().toJson(Data);

Gson().toJson(Data);

上面的代码使用了TypeToken，它是Gson提供的数据类型转换器，可以支持各种数据集合类型转换。