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 Android教程網 >> Android技術 >> 關於Android編程 >> Android中解析Json數據

Android中解析Json數據

編輯：關於Android編程



一、原理分析

\


<喎?/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+tv6horT6wuvKtc/WKNX7zNe0+sLrtcTPwtTYtdjWt2h0dHA6Ly9kb3dubG9hZC5jc2RuLm5ldC9kZXRhaWwvY2FpaG9uZ3NoaWppZTYvNjcwMTI3OSk8L3A+CjxwPsv50OjSqrXESlNPTrXEz+C52LXEamFysPy1xM/C1Ni12Na3aHR0cDovL2Rvd25sb2FkLmNzZG4ubmV0L2RldGFpbC9jYWlob25nc2hpamllNi82NzAxMjg1PC9wPgo8cD48YnI+CjwvcD4KPHA+MaGit/7O8cb3tsso1vfSqtPD09rJ+rPJSlNPTiYjMjY2ODQ7yr21xNfWt/u0rik8L3A+CjxwPiAgMSlKc29uQWN0aW9uPC9wPgo8cD48cHJlIGNsYXNzPQ=="brush:java;">package com.njupt.action; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.njupt.service.JsonService; import com.njupt.tools.JsonTools; public class JsonAction extends HttpServlet { private JsonService service; /** * Constructor of the object. */ public JsonAction() { super(); } /** * Destruction of the servlet.
*/ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet.
* * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); // String jsonString = JsonTools.createJsonString("persons", service.getListPerson()); String jsonString = ""; String action_flag = request.getParameter("action_flag"); if(action_flag.equals("person")){ jsonString = JsonTools.createJsonString("person", service.getPerson()); }else if(action_flag.equals("persons")){ jsonString = JsonTools.createJsonString("persons", service.getListPerson()); }else if(action_flag.equals("liststring")){ jsonString = JsonTools.createJsonString("liststring", service.getListString()); }else if(action_flag.equals("listmap")){ jsonString = JsonTools.createJsonString("listmap", service.getListMaps()); } out.println(jsonString); out.flush(); out.close(); } /** * Initialization of the servlet.
* * @throws ServletException if an error occurs */ public void init() throws ServletException { service = new JsonService(); } }

2)JsonService

package com.njupt.service;

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

import org.apache.commons.collections.map.HashedMap;

import com.njupt.pojo.Person;

public class JsonService {
	public JsonService() {
		// TODO Auto-generated constructor stub
	}
	
	public Person getPerson(){
		Person person = new Person(1001,"zhangzetian","beijing");
	    
		return person;
	}
	
	
	public List getListPerson(){
		List list = new ArrayList();
		
		Person person1 = new Person(1003,"huangjundong","beijing");
		Person person2 = new Person(1004,"zhangzetian","guangdong");
		
		list.add(person1);
		list.add(person2);
	 
		return list;
	}
	
	public List getListString(){
		List list = new ArrayList();
		list.add("beijing");
		list.add("shanghai");
		list.add("hunan");
		
		return list;
	}
	
	public List> getListMaps(){
		List> list = new ArrayList>();
		Map map1 = new HashMap();
	    map1.put("id", 1001);
	    map1.put("name", "huangjundong");
	    map1.put("address", "beijing");
	    
	    Map map2 = new HashMap();
	    map2.put("id", 1002);
	    map2.put("name", "zhangzetian");
	    map2.put("address", "beijing");
	    
	    list.add(map1);
	    list.add(map2);
	    
	    return list;
	}
}


3)Person

package com.njupt.pojo;

public class Person {
	private int id;
	private String name;
	private String address;
	
	public Person() {
		// TODO Auto-generated constructor stub
	}

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

	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 getAddress() {
		return address;
	}

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

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

4)JsonTools

package com.njupt.tools;

import net.sf.json.JSONObject;

/**
 * 服務器端的JSONTools主要用於生成JSON
 * @author Administrator
 *
 */
public class JsonTools {

	public JsonTools() {
		// TODO Auto-generated constructor stub
	}
	
	
	public static String createJsonString(String key,Object value){
		JSONObject jsonObject = new JSONObject();
		jsonObject.put(key, value);
		return jsonObject.toString();
	}
}



2、Android端

1)main.xml


2)MainActivity

package com.njupt.android_json;

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

import com.njupt.pojo.Person;
import com.njupt.tools.JsonTools;

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

public class MainActivity extends Activity implements OnClickListener {

	private Button person;
	private Button persons;
	private Button liststring;
	private Button listmap;

	private String path = "http://192.168.1.104:8080/JsonProject/servlet/JsonAction";
	
	private static final String TAG = "MAIN";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		person = (Button) findViewById(R.id.person);
		persons = (Button) findViewById(R.id.persons);
		liststring = (Button) findViewById(R.id.liststring);
		listmap = (Button) findViewById(R.id.listmap);
		
		person.setOnClickListener(this);
		persons.setOnClickListener(this);
		liststring.setOnClickListener(this);
		listmap.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.person:

			String tempPath = path;
			tempPath += "?action_flag=person";
			String jsonString = HttpUtils.getJsonContent(tempPath);
			Person person = JsonTools.getPerson("person", jsonString);
			Log.i(TAG, person.toString());
			
			Toast.makeText(this, person.toString(), 1).show();
			
			break;

		case R.id.persons:
			
			tempPath = path;
			tempPath += "?action_flag=persons";
			jsonString = HttpUtils.getJsonContent(tempPath);
			List list = JsonTools.getPersons("persons", jsonString);
			Log.i(TAG, list.toString());
			
			Toast.makeText(this, list.toString(), 1).show();
			
			break;
		case R.id.liststring:

			tempPath = path;
			tempPath += "?action_flag=liststring";
			jsonString = HttpUtils.getJsonContent(tempPath);
			List list1 = JsonTools.getList("liststring", jsonString);
			Log.i(TAG, list1.toString());
			
			Toast.makeText(this, list1.toString(), 1).show();
			
			break;

		case R.id.listmap:

			tempPath = path;
			tempPath += "?action_flag=listmap";
			jsonString = HttpUtils.getJsonContent(tempPath);
			List> list4 = JsonTools.listKeyMaps("listmap", jsonString);
			Log.i(TAG, list4.toString());
			
			Toast.makeText(this, list4.toString(), 1).show();
			
			break;
		default:
			break;
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}


3)HttpUtils

package com.njupt.android_json;

import java.io.ByteArrayOutputStream;
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) {
			e.printStackTrace();
		}
		
		return "";
	}

	private static String changeInputStream(InputStream inputStream) {
		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(Exception e){
			e.printStackTrace();
		}
		return jsonString;
	}
}


4)Person

package com.njupt.pojo;

public class Person {
	private int id;
	private String name;
	private String address;
	
	public Person() {
		// TODO Auto-generated constructor stub
	}

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

	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 getAddress() {
		return address;
	}

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

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

5)JsonTools

package com.njupt.tools;

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.njupt.pojo.Person;

/**
 * 客戶端的JsonTools主要用來解析JSON
 * @author Administrator
 *
 */
public class JsonTools {

	public JsonTools() {
		// TODO Auto-generated constructor stub
	}
	
	
	public static Person getPerson(String key,String jsonString){
		Person person = new Person();
		
		try{
			/**
			 * 解析就是一個person的情況
			 * {"person":{"address":"beijing","id":1001,"name":"jack"}}
			 */
			JSONObject jsonObject = new JSONObject(jsonString);//獲得的是: {"person":{"address":"beijing","id":1001,"name":"jack"}}
			JSONObject personObject = jsonObject.getJSONObject(key);//獲得的是: {"address":"beijing","id":1001,"name":"jack"}
			
			person.setId(personObject.getInt("id"));
			person.setName(personObject.getString("name"));
			person.setAddress(personObject.getString("address"));
		}catch(Exception e){
			
		}
		
		return person;
	}
	
	
	/**
	 * 解析List的情況
	 * {"persons":[{"address":"beijing","id":1003,"name":"huangjundong"},{"address":"guangdong","id":1004,"name":"zhangzetian"}]}
	 * @param key
	 * @param jsonString
	 * @return
	 */
	public static List getPersons(String key,String jsonString){
		List list = new ArrayList();
		
		try{
			JSONObject jsonObject = new JSONObject(jsonString);
			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){
			e.printStackTrace();
		}
		
		return list;
	}
	
	
	/**
	 * 解析List的情況
	 * {"liststring":["beijing","shanghai","hunan"]}
	 * @param key
	 * @param jsonString
	 * @return
	 */
	public static List getList(String key,String jsonString){
		List list = new ArrayList();
		
		try{
			JSONObject jsonObject = new JSONObject(jsonString);
			JSONArray jsonArray = jsonObject.getJSONArray(key);
			
			for(int i = 0 ; i < jsonArray.length() ; ++i){
				String msg = jsonArray.getString(i);//***這裡與上面的那種情況不同..
				
				list.add(msg);
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		
		return list;
	}
	
	
	/**
	 * 解析List的情況
	 * {"listmap":[{"id":1001,"address":"beijing","name":"huangjundong"},{"id":1002,"address":"beijing","name":"zhangzetian"}]}
	 * @param key
	 * @param jsonString
	 * @return
	 */
	public static List> listKeyMaps(String key,String jsonString){
		List> list = new ArrayList>();
		
		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 map = new HashMap();
				Iterator iterator = jsonObject2.keys();
				
				while(iterator.hasNext()){
					String jsonKey = iterator.next();
					Object jsonValue = jsonObject2.get(jsonKey);
					
					if(jsonValue == null){
							jsonValue = "";
					}
					
					map.put(jsonKey, jsonValue);
				}
				
				list.add(map);
				
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		return list;
	}
}


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