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
目录：
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
==============================
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>() {
@Override
protected 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() {
@Override
public 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() {
@Override
public 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;
@Override
protected 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() {
@Override
public 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() {
@Override
public void onSuccess(String result) {
Intent intent = new Intent(MainActivity.this, ATYHome.class);
intent.putExtra(Config.KEY_RESULT, result);
startActivity(intent);
finish();
}
},
new Login.FailCallback() {
@Override
public 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());
}
}
做一个简单的servlet，只要收到请求了，就返回一个字符串“hello welcom”的json给APP
2.2 结果
APP将收到的结果提取出来，传给下一个页面并显示出来即可。
时间： 2024-08-27 20:17:27