android Gson解析

解析一个简单的Json数据都写了这么多代码

谷歌推出了一款Json解析神器——> Gson

那 Gson 是用来干嘛的呢，它是用来将Json数据转换成对象，或将对象转换成Json数据。只需要导入相应 jar 包就可以。

Gson下载地址：http://download.csdn.net

这次的Json数据为：

{name:张三 ,age:26,phone:[131,132],score:[{id:语文,fenshu:100},{id:数学,fenshu:60},{id:化学,fenshu:120}]}

步骤：

①将下载好的Gson jar 包导入到 libs目录下

②创建Gson对象

Gson gson = new Gson();
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③创建需要转成的JavaBean

我这里创建一个 Student 类

Student.java

//Student的属性必须和Json中的KEY值一样。//JsonObject转化成类，JsonArray转化成集合public class Student {    public String name;    public String age;    public ArrayList<String> phone = new ArrayList<String>();    public ArrayList<Score> score = new ArrayList<Score>();    public class Score {        public String id;        public String fenshu;        @Override        public String toString() {            return "id:" + id + "  fenshu:" + fenshu;        }    }    @Override    public String toString() {        return "name:" + name + "   age:" + age                + "    phone:" + phone.get(0)+ "," + phone.get(1) + "   score:" + score.toString();    }}

注：

1、需要生成的类的类名由你自己定义，没有关系；

2、类里面的属性名必须跟Json字段里面的Key是一模一样的；

3、内部嵌套的用[]括起来的部分是一个List

④将Json数据转化成Student对象

Student student = gson.fromJson(JSONDATA, Student.class);
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使用Gson是不是比传统方法更简单呢，赶紧试试吧

核心代码：

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.gson.MainActivity" >    <Button android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="gson"        android:text="Gson解析"/>    <TextView        android:textSize="20sp"        android:id="@+id/tv"        android:layout_centerInParent="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>

MainAcitivity.java

public class MainActivity extends Activity {    private TextView tv;    //json数据    public static final String JSONDATA = "{name:张三 ,age:26,phone:[131,132],score:[{id:语文,fenshu:100},{id:数学,fenshu:60},{id:化学,fenshu:120}]}";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.tv);    }    public void gson(View view) {        //创建一个Gson对象        Gson gson = new Gson();        //将Json数据转化成Student对象        Student student = gson.fromJson(JSONDATA, Student.class);        //将解析的Json数据显示在TextView上        tv.setText(student.toString());    }}

Student.java

public class Student {    public String name;    public String age;    public ArrayList<String> phone = new ArrayList<String>();    public ArrayList<Score> score = new ArrayList<Score>();    public class Score {        public String id;        public String fenshu;        @Override        public String toString() {            return "id:" + id + "  fenshu:" + fenshu;        }    }    @Override    public String toString() {        return "name:" + name + "   age:" + age                + "    phone:" + phone.get(0)+ "," + phone.get(1) + "   score:" + score.toString();    }}