石家庄网站建设企业/搜索引擎营销的方法不包括

在前几篇文章中《Android 采用get方式提交数据到服务器》《Android 采用post方式提交数据到服务器》《Android 采用HttpClient提交数据到服务器》介绍了android的两种提交数据到服务器的方法

本文将介绍另外一种基于框架android-async-http的方法来实现

android-async-http是一个强大的网络请求库，这个网络请求库是基于Apache HttpClient库之上的一个异步网络请求处理库，网络处理均基于Android的非UI线程，通过回调方法处理请求结果。android-async-http是一个强大的第三方开源网络请求库

官网源码：https://github.com/loopj/android-async-http

官网教程：http://loopj.com/android-async-http/

新建项目，先到github上：https://github.com/loopj/android-async-http/tree/1.4.0

下载相应的zip文件，解压缩后将src中的com文件夹复制到项目的src目录

下面使用框架android-async-http，代码如下：

package com.wuyudong.asynchttp;import java.net.URLEncoder;import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void click(View view) {// 用户名密码提交到服务器AsyncHttpClient client = new AsyncHttpClient();String path = "http://169.254.168.71:8080/web/LoginServlet?username="+ URLEncoder.encode("wuyudong") + "&password="+ URLEncoder.encode("123");client.get(path, new AsyncHttpResponseHandler() {@Overridepublic void onSuccess(String content) {// TODO Auto-generated method stubsuper.onSuccess(content);Toast.makeText(MainActivity.this, "请求成功！", 0).show();}@Overridepublic void onFailure(Throwable error, String content) {// TODO Auto-generated method stubsuper.onFailure(error, content);Toast.makeText(MainActivity.this, "请求失败！", 0).show();}});}}

可以看到代码量减少了很多

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下面来实现一个精简版的异步框架

新建项目

AsyncHttpClient.java

package com.wuyudong.AsyncClient;import java.io.IOException;
import java.io.InputStream;import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;import android.os.Message;public class AsyncHttpClient {public void get(final String path, final MyHandler myHandler) {new Thread() {@Overridepublic void run() {HttpClient client = new DefaultHttpClient();HttpGet httpGet = new HttpGet(path);try {HttpResponse response = client.execute(httpGet);InputStream is = response.getEntity().getContent();String content = StreamTools.readInputStream(is);// 执行成功Message msg = new Message();msg.what = 0;msg.obj = "请求成功";myHandler.sendMessage(msg);} catch (Exception e) {e.printStackTrace();// 执行失败Message msg = new Message();msg.what = 1;msg.obj = "请求失败";myHandler.sendMessage(msg);}}}.start();}}

MainActivity.java

package com.wuyudong.AsyncClient;import java.net.URLEncoder;import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void click(View view) {// 1、开启子线程 执行一个http请求，在后台执行 在子线程执行// 2、 子线程执行完毕后通知ui界面
AsyncHttpClient client = new AsyncHttpClient();String path = "http://169.254.168.71:8080/web/LoginServlet?username="+ URLEncoder.encode("wuyudong") + "&password="+ URLEncoder.encode("123");client.get(path, new MyHandler() {@Overridepublic void onFailure(String content) {Toast.makeText(MainActivity.this, content, 1).show();super.onFailure(content);}@Overridepublic void onSuccess(String content) {Toast.makeText(MainActivity.this, content, 0).show();super.onSuccess(content);}});}
}

MyHandler.java

package com.wuyudong.AsyncClient;import android.os.Handler;
import android.os.Message;public class MyHandler extends Handler {public void onFailure(String content) {}public void onSuccess(String content) {}@Overridepublic void handleMessage(Message msg) {String content = (String) msg.obj;switch (msg.what) {case 0:onSuccess(content);break;case 1:onFailure(content);break;default:break;}super.handleMessage(msg);}
}

StreamTools.java

package com.wuyudong.AsyncClient;import java.io.ByteArrayOutputStream;
import java.io.InputStream;public class StreamTools {/*** 把输入流的内容转化成字符串* * @param is* @return*/public static String readInputStream(InputStream is) {try {ByteArrayOutputStream baos = new ByteArrayOutputStream();int len = 0;byte[] buffer = new byte[1024];while ((len = is.read(buffer)) != -1) {baos.write(buffer, 0, len);}is.close();baos.close();byte[] result = baos.toByteArray();String str = new String(result);// 试着解析result里面的字符串if (str.contains("gb2312")) {return new String(result, "gb2312");} else if(str.contains("utf-8")){return str;} else {return null;}//return new String(result, "gb2312");} catch (Exception e) {e.printStackTrace();return null;}}}