Android 解析Json 和Json数组 以及Gson的简单应用

Gson jar 下载地址 ：http://download.csdn.net/download/u010637692/8348917

下载后 build一下就行了

惨考 http://www.open-open.com/solution/view/1319448346593

JSON即JavaScript Object Natation, 它是一种轻量级的数据交换格式, 与XML一样, 是广泛被采用的客户端和服务端交互的解决方案.

JSON对象: JSON中对象(Object)以"{"开始, 以"}"结束. 对象中的每一个item都是一个key-value对, 表现为"key:value"的形式, key-value对之间使用逗号分隔. 如:{"name":"coolxing", "age"=24, "male":true, "address":{"street":"huiLongGuan", "city":"beijing", "country":"china"}}. JSON对象的key只能是string类型的, 而value可以是string, number, false, true, null, Object对象甚至是array数组, 也就是说可以存在嵌套的情况.

JSON数组: JSON数组(array)以"["开始, 以"]"结束, 数组中的每一个元素可以是string, number, false, true, null, Object对象甚至是array数组, 数组间的元素使用逗号分隔. 如["coolxing", 24, {"street":"huiLongGuan", "city":"beijing", "country":"china"}].

 

JSON数据的解析:解析JSON数据, 首先需要明确待解析的是JSON Object还是JSON array, 然后需要确定采用哪种解析技术. android平台上一般有2种解析技术可供选择: android内置的org.json包和google的开源gson库. 以下将分别采用这两种技术解析JSON对象和JSON数组.

1.  采用android内置的org.json包解析JSON对象. 假设待解析的JSON数据为json = "{\"name\":\"coolxing\", \"age\"=24, \"male\":true, \"address\":{\"street\":\"huiLongGuan\", \"city\":\"beijing\", \"country\":\"china\"}}", 其中\用于转义表达式中的双引号. 首先定义2个JavaBean:

先声明两个javabean

package com.yinggujing;/** * Created by ChenHe on 2016/6/2. */public class Address {    private String street;    private String city;    private String country;    public Address() {        super();    }    public Address(String street, String city, String country) {        super();        this.street = street;        this.city = city;        this.country = country;    }    public String getStreet() {        return street;    }    public void setStreet(String street) {        this.street = street;    }    public String getCity() {        return city;    }    public void setCity(String city) {        this.city = city;    }    public String getCountry() {        return country;    }    public void setCountry(String country) {        this.country = country;    }    @Override    public String toString() {        return "Address [street=" + street + ", city=" + city + ", country="                + country + "]";    }}

package com.yinggujing;/** * Created by ChenHe on 2016/6/2. */public class Person {    private String name;    private int age;    private boolean male;    private Address address;    public Person() {        super();    }    public Person(String name, int age, boolean male, Address address) {        super();        this.name = name;        this.age = age;        this.male = male;        this.address = address;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public boolean isMale() {        return male;    }    public void setMale(boolean male) {        this.male = male;    }    public Address getAddress() {        return address;    }    public void setAddress(Address address) {        this.address = address;    }    @Override    public String toString() {        return "Person [name=" + name + ", age=" + age + ", male=" + male                + ", address=" + address + "]";    }}

java代码

package com.yinggujing;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import com.yinggujing.FragListBean.ChildWarningArcherListBean;import java.lang.reflect.Type;import java.util.List;/** * Created by ChenHe on 2016/6/2. */public class GsonText extends AppCompatActivity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //数据源 一一对应的 分别对应两种方式 json和Gson解析       String json = "[{\"name\":\"coolxing\", \"age\"=24, \"male\":true, \"address\":{\"street\":\"huiLongGuan\", \"city\":\"beijing\", \"country\":\"china\"}}, {\"name\":\"min\", \"age\"=20, \"male\":false, \"address\":{\"street\":\"heiShiJiao\", \"city\":\"daLian\", \"country\":\"china\"}}]";        String json1 = "{\"name\":\"coolxing\", \"age\"=24, \"male\":true, \"address\":{\"street\":\"huiLongGuan\", \"city\":\"beijing\", \"country\":\"china\"}}";      String json2 = "[{\"name\":\"coolxing\", \"age\"=24, \"male\":true, \"address\":{\"street\":\"huiLongGuan\", \"city\":\"beijing\", \"country\":\"china\"}}, {\"name\":\"min\", \"age\"=20, \"male\":false, \"address\":{\"street\":\"heiShiJiao\", \"city\":\"daLian\", \"country\":\"china\"}}]";//        try {//            List<Person> persons = new ArrayList<Person>();//            JSONArray jsonArray = new JSONArray(json);//            for(int i = 0; i < jsonArray.length(); i++)//            {//                JSONObject jsonObject = jsonArray.getJSONObject(i);//                String name = jsonObject.getString("name");//                int age = jsonObject.getInt("age");//                boolean male = jsonObject.getBoolean("male");//                JSONObject addressJSON = jsonObject.getJSONObject("address");//                String street = addressJSON.getString("street");//                String city = addressJSON.getString("city");//                String country = addressJSON.getString("country");//                Address address = new Address(street, city, country);//                Person person = new Person(name, age, male, address);//                persons.add(person);//            }//            System.out.println(persons);//        } catch (JSONException e) {//            e.printStackTrace();//        }//        Gson gson = new Gson();//        Person person = gson.fromJson(json1, Person.class);//        System.out.println(person);//        try {//            List<Person> persons = new ArrayList<Person>();//            JSONArray jsonArray = new JSONArray(json2);//            for(int i = 0; i < jsonArray.length(); i++) {//                JSONObject jsonObject = jsonArray.getJSONObject(i);//                String name = jsonObject.getString("name");//                int age = jsonObject.getInt("age");//                boolean male = jsonObject.getBoolean("male");//                JSONObject addressJSON = jsonObject.getJSONObject("address");//                String street = addressJSON.getString("street");//                String city = addressJSON.getString("city");//                String country = addressJSON.getString("country");//                Address address = new Address(street, city, country);//                Person person = new Person(name, age, male, address);//                persons.add(person);//            }//            System.out.println(persons);//        } catch (JSONException e) {//            e.printStackTrace();//        }        Gson gson = new Gson();        Type listType = new TypeToken<List<ChildWarningArcherListBean>>(){}.getType();        List<ChildWarningArcherListBean> persons = gson.fromJson(json2, listType);        System.out.println(persons);    }}