Android--用JSON解析数据

gson-1.7.1.jar,Gson在Android3.0以上才能直接使用，在3.0以下想使用可以从外部导入jar包

下载链接：http://download.csdn.net/detail/zlqqhs/5075995

新建工程，新建一个libs文件夹，将gson-1.7.1.jar复制到libs文件夹中

右键gson-1.7.1.jar，选择Build Path,选择Add...那一项

package com.vince.json;import java.io.IOException;import java.io.StringReader;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import com.google.gson.stream.JsonReader;public class JSONActivity extends Activity {private Button btnJson1,btnJson2,btnJson3,btnJson4,btnJson5;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        btnJson1 = (Button) findViewById(R.id.button1_json1);        btnJson2 = (Button) findViewById(R.id.button2_json2);        btnJson3 = (Button) findViewById(R.id.button3_json3);        btnJson4 = (Button) findViewById(R.id.button4_json4);        btnJson5 = (Button) findViewById(R.id.button5_json5);                btnJson1.setOnClickListener(new OnClickListener() {public void onClick(View v) {json1();}});        btnJson2.setOnClickListener(new OnClickListener() {public void onClick(View v) {json2();}});        btnJson3.setOnClickListener(new OnClickListener() {public void onClick(View v) {json3();}});        btnJson4.setOnClickListener(new OnClickListener() {public void onClick(View v) {json4();}});        btnJson5.setOnClickListener(new OnClickListener() {public void onClick(View v) {json5();}});    }        //使用GSON把一组对象转换成json数据    protected void json5() {    Student s1 = new Student(1,"jack","男",20);    Student s2 = new Student(2,"lucy","女",21);    List<Student> list = new ArrayList<Student>();    list.add(s1);    list.add(s2);        Gson gson = new Gson();    Type type = new TypeToken<List<Student>>(){}.getType();    String json = gson.toJson(list, type);    Toast.makeText(this, json, Toast.LENGTH_SHORT).show();}//使用GSON把一个对象转换成json数据    protected void json4() {Student s = new Student(1,"jack","男",20);Gson gson = new Gson();String json = gson.toJson(s);Toast.makeText(this, json, Toast.LENGTH_SHORT).show();}class MyTypeToken extends TypeToken<List<Student>>{        }        //使用GSON解析一组json数据    protected void json3() {String json = "[{\"id\":1,\"name\":\"tom\",\"sex\":\"男\",\"age\":18},{\"id\":2,\"name\":\"lily\",\"sex\":\"女\",\"age\":19}]";Gson gson = new Gson();Type type = new TypeToken<List<Student>>(){}.getType();//Type type = new MyTypeToken().getType();List<Student> list = gson.fromJson(json, type);//测试for (Student student : list) {Toast.makeText(this, student.toString(), Toast.LENGTH_SHORT).show();}}//使用GSON解析一个json数据    protected void json2() {String json = "{\"id\":1,\"name\":\"tom\",\"sex\":\"男\",\"age\":18}";Gson gson = new Gson();Student s = gson.fromJson(json, Student.class);Toast.makeText(this, s.toString(), Toast.LENGTH_SHORT).show();}//使用JsonReader解析json数据protected void json1() {String json = "[{\"id\":1,\"name\":\"tom\",\"sex\":\"男\",\"age\":18},{\"id\":2,\"name\":\"lily\",\"sex\":\"女\",\"age\":19}]";//把字符串封装成一个字符流对象StringReader sr = new StringReader(json);//创建JSON解析器JsonReader reader = new JsonReader(sr);List<Student> list = new ArrayList<Student>();try {reader.beginArray();//开始解析数组while(reader.hasNext()){Student s = new Student();reader.beginObject();//开始解析对象while(reader.hasNext()){String name= reader.nextName();//获取当前对象属性名称if("id".equals(name)){s.setId(reader.nextInt());}else if("name".equals(name)){s.setName(reader.nextString());}else if("sex".equals(name)){s.setSex(reader.nextString());}else if("age".equals(name)){s.setAge(reader.nextInt());}}reader.endObject();//结束解析对象list.add(s);}reader.endArray();//结束解析数组} catch (IOException e) {e.printStackTrace();}//测试输出for (Student student : list) {Toast.makeText(this, student.toString(), Toast.LENGTH_SHORT).show();}}}

package com.vince.json;public class Student {private int id;private String name;private String sex;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Student [id=" + id + ", name=" + name + ", sex=" + sex+ ", age=" + age + "]";}public Student(int id, String name, String sex, int age) {super();this.id = id;this.name = name;this.sex = sex;this.age = age;}public Student() {super();}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />    <Button        android:id="@+id/button1_json1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="使用JsonReader解析json数据" />    <Button        android:id="@+id/button2_json2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="使用Gson解析单个json数据" />    <Button        android:id="@+id/button3_json3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="使用Gson解析多个json数据" />    <Button        android:id="@+id/button4_json4"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="把一个对象转换成json数据" />    <Button        android:id="@+id/button5_json5"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="把一组对象转换民json数据" /></LinearLayout>

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