android Json Gson FastJson 解析

一 Json

xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <Button android:id="@+id/person" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="解析Person数据" />
    <Button android:id="@+id/persons" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="解析List嵌套Person数据" />
    <Button android:id="@+id/liststring" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="解析List嵌套String数据" />
    <Button android:id="@+id/listmap" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="解析ListMap数据" />
</LinearLayout>

java

Main.java

package com.android.myjson;

import java.util.List;
import java.util.Map;

import com.android.myjson.domain.Person;
import com.android.myjson.http.HttpUtils;
import com.android.myjson.json.JsonTools;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Main extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    private Button person, persons, liststring, listmap;
    private static final String TAG = "Main";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        person = (Button) this.findViewById(R.id.person);
        persons = (Button) this.findViewById(R.id.persons);
        liststring = (Button) this.findViewById(R.id.liststring);
        listmap = (Button) this.findViewById(R.id.listmap);
        person.setOnClickListener(this);
        persons.setOnClickListener(this);
        liststring.setOnClickListener(this);
        listmap.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.person:
            String path = "http://192.168.11.249:8080/jsonProject/servlet/JsonAction?action_flag=person";
            String jsonString = HttpUtils.getJsonContent(path);
            Person person = JsonTools.getPerson("person", jsonString);
            Log.i(TAG, person.toString());
            break;
        case R.id.persons:
            String path2 = "http://192.168.11.249:8080/jsonProject/servlet/JsonAction?action_flag=persons";
            String jsonString2 = HttpUtils.getJsonContent(path2);
            List<Person> list2 = JsonTools.getPersons("persons", jsonString2);
            Log.i(TAG, list2.toString());
            break;
        case R.id.liststring:
            String path3 = "http://192.168.11.249:8080/jsonProject/servlet/JsonAction?action_flag=liststring";
            String jsonString3 = HttpUtils.getJsonContent(path3);
            List<String> list3 = JsonTools.getList("liststring", jsonString3);
            Log.i(TAG, list3.toString());
            break;
        case R.id.listmap:
            String path4 = "http://192.168.11.249:8080/jsonProject/servlet/JsonAction?action_flag=listmap";
            String jsonString4 = HttpUtils.getJsonContent(path4);
            List<Map<String, Object>> list4 = JsonTools.listKeyMaps("listmap",
                    jsonString4);
            Log.i(TAG, list4.toString());
            break;
        }
    }
}

　　Person.java

 package com.android.myjson.domain;

 public class Person {

     private int id;
     private String name;

     public Person(int id, String name, String address) {
         super();
         this.id = id;
         this.name = name;
         this.address = address;
     }

     private String address;

     public int getId() {
         return id;
     }

     @Override
     public String toString() {
         return "Person [address=" + address + ", id=" + id + ", name=" + name
                 + "]";
     }

     public void setId(int id) {
         this.id = id;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getAddress() {
         return address;
     }

     public void setAddress(String address) {
         this.address = address;
     }

     public Person() {
         // TODO Auto-generated constructor stub
     }

 }

HttpUtils.java

 package com.android.myjson.http;

 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;

 public class HttpUtils {

     public HttpUtils() {
         // TODO Auto-generated constructor stub
     }

     public static String getJsonContent(String url_path) {
         try {
             URL url = new URL(url_path);
             HttpURLConnection connection = (HttpURLConnection) url
                     .openConnection();
             connection.setConnectTimeout(3000);
             connection.setRequestMethod("GET");
             connection.setDoInput(true);
             int code = connection.getResponseCode();
             if (code == 200) {
                 return changeInputStream(connection.getInputStream());
             }
         } catch (Exception e) {
             // TODO: handle exception
         }
         return "";
     }

     private static String changeInputStream(InputStream inputStream) {
         // TODO Auto-generated method stub
         String jsonString = "";
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
         int len = 0;
         byte[] data = new byte[1024];
         try {
             while ((len = inputStream.read(data)) != -1) {
                 outputStream.write(data, 0, len);
             }
             jsonString = new String(outputStream.toByteArray());
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return jsonString;
     }
 }

JsonTools.java

 package com.android.myjson.json;

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.json.JSONArray;
 import org.json.JSONObject;

 import com.android.myjson.domain.Person;

 /**
  * 完成对json数据的解析
  *
  * @author jack
  *
  */
 public class JsonTools {

     public JsonTools() {
         // TODO Auto-generated constructor stub
     }

     public static Person getPerson(String key, String jsonString) {
         Person person = new Person();
         try {
             JSONObject jsonObject = new JSONObject(jsonString);
             JSONObject personObject = jsonObject.getJSONObject("person");
             person.setId(personObject.getInt("id"));
             person.setName(personObject.getString("name"));
             person.setAddress(personObject.getString("address"));
         } catch (Exception e) {
             // TODO: handle exception
         }
         return person;
     }

     public static List<Person> getPersons(String key, String jsonString) {
         List<Person> list = new ArrayList<Person>();
         try {
             JSONObject jsonObject = new JSONObject(jsonString);
             // 返回json的数组
             JSONArray jsonArray = jsonObject.getJSONArray(key);
             for (int i = 0; i < jsonArray.length(); i++) {
                 JSONObject jsonObject2 = jsonArray.getJSONObject(i);
                 Person person = new Person();
                 person.setId(jsonObject2.getInt("id"));
                 person.setName(jsonObject2.getString("name"));
                 person.setAddress(jsonObject2.getString("address"));
                 list.add(person);
             }
         } catch (Exception e) {
             // TODO: handle exception
         }
         return list;
     }

     public static List<String> getList(String key, String jsonString) {
         List<String> list = new ArrayList<String>();
         try {
             JSONObject jsonObject = new JSONObject(jsonString);
             JSONArray jsonArray = jsonObject.getJSONArray(key);
             for (int i = 0; i < jsonArray.length(); i++) {
                 String msg = jsonArray.getString(i);
                 list.add(msg);
             }
         } catch (Exception e) {
             // TODO: handle exception
         }
         return list;
     }

     public static List<Map<String, Object>> listKeyMaps(String key,
             String jsonString) {
         List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
         try {
             JSONObject jsonObject = new JSONObject(jsonString);
             JSONArray jsonArray = jsonObject.getJSONArray(key);
             for (int i = 0; i < jsonArray.length(); i++) {
                 JSONObject jsonObject2 = jsonArray.getJSONObject(i);
                 Map<String, Object> map = new HashMap<String, Object>();
                 Iterator<String> iterator = jsonObject2.keys();
                 while (iterator.hasNext()) {
                     String json_key = iterator.next();
                     Object json_value = jsonObject2.get(json_key);
                     if (json_value == null) {
                         json_value = "";
                     }
                     map.put(json_key, json_value);
                 }
                 list.add(map);
             }
         } catch (Exception e) {
             // TODO: handle exception
         }
         return list;
     }
 }