Android 网络通信架构学习

最近跟着云课堂上的极客学院做安卓APP，学习了课程里面介绍的一种网络通信架构。清晰明了，比我自己东一块西一块拼凑出来的要好很多。在这里记录一下。

云课堂的连接：http://study.163.com/course/courseMain.htm?courseId=917001

一、Android端实现

1.1 架构图

1.2 NetworkConnection.java实现

1.3 Logic.java实现

1.4 Activity.java实现

二、测试

2.1 服务器配置

2.2 结果

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正文

1.1 架构图

NetworkConnection.java里面实现的，就是网络通信的内容。他不负责任何逻辑处理，只提供网络通信，将逻辑处理过程通过回调函数的方式留给上层的Logic.java实现

Logic.java针对具体的处理事件，实现处理逻辑，如数据的处理，网络通信成功或失败的后续处理等。与界面的交流等主要通过回调函数，留给Activity.java实现

Activity.java是界面类，主要获取界面内容和更新界面，通过实现Logic.java 的回调函数进行页面的更新。

以一个登陆的例子，其源代码组织如图：

1.2 NetworkConnection.java的实现

package com.example.networkarch.net;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;import android.os.AsyncTask;public class NetConnection {public NetConnection(final String url,final HttpMethod method,final SuccessCallback successCallback,final FailCallback failCallback,final String ... kvs){System.out.println("4");new AsyncTask<Void, Void, String>() {@Overrideprotected String doInBackground(Void... arg0) {StringBuffer paramsStr = new StringBuffer();for(int i  = 0; i < kvs.length; i += 2){paramsStr.append(kvs[i]).append("+").append(kvs[i+1]).append("&");}URLConnection uc;try {switch (method) {case POST:uc = new URL(url).openConnection();uc.setDoOutput(true);BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(uc.getOutputStream()));bw.write(paramsStr.toString());bw.flush();break;default:uc = new URL(url + "?" + paramsStr.toString()).openConnection();break;}BufferedReader br = new BufferedReader(new InputStreamReader(uc.getInputStream()));String line = null;StringBuffer result = new StringBuffer();while((line = br.readLine()) != null){result.append(line);}System.out.println("++result: "+result.toString());return result.toString();} catch (MalformedURLException e) {// TODO Auto-generated catch block
                    e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block
                    e.printStackTrace();}return null;}protected void onPostExecute(String result){if(result != null){if(successCallback != null){successCallback.onSuccess(result);}}else{if(failCallback != null){failCallback.onFail();}}super.onPostExecute(result);}}.execute();}public static interface SuccessCallback{void onSuccess(String result);}public static interface FailCallback{void onFail();}}

1.3 Logic.java的实现

package com.example.networkarch.logic;import org.json.JSONException;
import org.json.JSONObject;import com.example.networkarch.Config;
import com.example.networkarch.net.HttpMethod;
import com.example.networkarch.net.NetConnection;public class Login {public Login(String username,String password,final SuccessCallback successCallback,final FailCallback failCallback){System.out.println("3");new NetConnection(Config.SERVER_URL, HttpMethod.POST,new NetConnection.SuccessCallback() {@Overridepublic void onSuccess(String result) {if(successCallback != null){try {System.out.println("result: "+result);JSONObject jsonObject = new JSONObject(result);System.out.println("5");switch (jsonObject.getInt(Config.KEY_STATUS)) {case Config.RESULT_STATUS_SUCCESS:if(successCallback != null){successCallback.onSuccess(jsonObject.getString(Config.VAULE_RESULT));}break;default:if(failCallback != null){failCallback.onFail();}break;}} catch (JSONException e) { e.printStackTrace();if(failCallback != null){failCallback.onFail();}}}}},new NetConnection.FailCallback() {@Overridepublic void onFail() {if(failCallback != null){failCallback.onFail();}}}, "action", "login", "username", username, "password", password);}public static interface SuccessCallback{void onSuccess(String result);}public static interface FailCallback{void onFail();}
}

1.4 Activity.java的实现

package com.example.networkarch;import com.example.networkarch.aty.ATYHome;
import com.example.networkarch.logic.Login;import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.os.Build;public class MainActivity extends ActionBarActivity {private EditText username;private EditText password;private Button loginButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);username = (EditText)findViewById(R.id.et_username);password = (EditText)findViewById(R.id.et_password);loginButton = (Button)findViewById(R.id.bt_login);loginButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {//final ProgressDialog pd  = ProgressDialog.show(MainActivity.this, "Login...", "Please wait");
                System.out.println("2");new Login(username.getText().toString(), password.getText().toString(), new Login.SuccessCallback() {@Overridepublic void onSuccess(String result) {Intent intent = new Intent(MainActivity.this, ATYHome.class);intent.putExtra(Config.KEY_RESULT, result);startActivity(intent);finish();}}, new Login.FailCallback() {@Overridepublic void onFail() {Toast.makeText(MainActivity.this, "Sorry", Toast.LENGTH_LONG).show();}});}});}}

另外补充两个在代码里面用到的代码：

package com.example.networkarch;public class Config {public static final String SERVER_URL = "http://192.168.1.13:80/NetworkTest/test";public static final int RESULT_STATUS_SUCCESS = 2;public static final int RESULT_STATUS_FAIL = 1;public static final String KEY_STATUS = "status";public static final String KEY_RESULT = "result";public static final String VAULE_RESULT = "result";}

package com.example.networkarch.net;public enum HttpMethod {POST,GET
}

APP需要上网的权限，在Manifest.xml文件中补充如下代码：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

2.1 Server端实现

package cn.example.servlet;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 net.sf.json.JSONObject;public class Result extends HttpServlet{public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{System.out.println("++++++++++++++++get the infor");JSONObject json = new JSONObject();json.put("status", 2);json.put("result", "hello welcome");PrintWriter out = response.getWriter();out.write(json.toString());}}