Android客户端与PHP服务端通信(二)
概述
本节通过一个简单的demo程序简单的介绍Android客户端通过JSON向PHP服务端提交订单,PHP服务端处理订单后,通过JSON返回结果给Android客户端。正常来讲,PHP服务端在处理订单过程中,需要与MySQL数据库交互,这里为了简单起见,暂时省掉MySQL。
通信格式
首先,需要定下客户端与服务端之间通信格式,如下表
Android客户端
客户端与服务端采用JSON数据格式通信,同时采用HTTP通信协议交互,采用POST方式提交结果。同时还要注意一点,与WEB服务器通信的过程需要另开辟一个线程进行数据的获取,这样可以防止获取程序失败之后,主线程还可以运行,我开始实验的时候没有注意到这一点,由于通信失败造成了程序停止运行。
同时由于需要网络通信,所以需要在AndroidManifest.xml中添加如下权限语句
程序的构造图比较简单,只有一个MainActivity.java。
运行效果为
MainActivity.java内容如下
package com.lygk.jsontest;import java.io.BufferedReader;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.params.CoreConnectionPNames;import org.apache.http.protocol.HTTP;import org.json.JSONObject;import com.example.jsontest.R;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity { private static final String TAG="LYGK"; Button BtnRequest; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.i(TAG, "启动程序 "); BtnRequest = (Button)findViewById(R.id.BtnRequest); //绑定事件源和监听器对象 BtnRequest.setOnClickListener(new ButtonRequestListener()); } //内部类,实现OnClickListener接口 //作为第二个按钮的监听器类 class ButtonRequestListener implements OnClickListener { public void onClick(View v) { Log.i(TAG, "按钮按下 "); StartRequestFromPHP(); Log.i(TAG, "执行完毕 "); } } private void StartRequestFromPHP() { //新建线程 new Thread(){ public void run(){ try { SendRequest(); } catch (Exception e) { e.printStackTrace(); } } }.start(); } private void SendRequest(){ //通过HttpClient类与WEB服务器交互 HttpClient httpClient = new DefaultHttpClient(); //定义与服务器交互的地址 String ServerUrl = "http://www.bigbearking.com/study/guestRequest.php"; //设置读取超时,注意CONNECTION_TIMEOUT和SO_TIMEOUT的区别 httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 5000); //设置读取超时 httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 5000); //POST方式 HttpPost httpRequst = new HttpPost(ServerUrl); //准备传输的数据 List<basicnamevaluepair> params = new ArrayList<basicnamevaluepair>(); params.add(new BasicNameValuePair("CMDID", "1")); params.add(new BasicNameValuePair("CUserName", "lygk")); params.add(new BasicNameValuePair("COrderName", "Apple")); params.add(new BasicNameValuePair("COrderNum", "2")); try{ //发送请求 httpRequst.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); //得到响应 HttpResponse response = httpClient.execute(httpRequst); //返回值如果为200的话则证明成功的得到了数据 if(response.getStatusLine().getStatusCode() == 200) { StringBuilder builder = new StringBuilder(); //将得到的数据进行解析 BufferedReader buffer = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); //readLine()阻塞读取 for(String s =buffer.readLine(); s!= null; s = buffer.readLine()) { builder.append(s); } System.out.println(builder.toString()); //得到Json对象 JSONObject jsonObject = new JSONObject(builder.toString()); //通过得到键值对的方式得到值 int CmdId = jsonObject.getInt("CMDID"); String SResult = jsonObject.getString("SResult"); String SUserName = jsonObject.getString("SUserName"); int SResultPara = jsonObject.getInt("SResultPara"); Log.i(TAG, "读取到数据 "); Log.i(TAG, "RequestResult:"+SResult); Log.i(TAG, "UserName:"+SUserName); //在线程中判断是否得到成功从服务器得到数据 } else{ Log.e(TAG, "连接超时 "); } }catch (Exception e) { e.printStackTrace(); Log.e(TAG, "请求错误 "); Log.e(TAG, e.getMessage()); } return ; }}</basicnamevaluepair></basicnamevaluepair>
Web服务端源码
guestRequest.php内容:
<?php //获取客户端发来的请求信息 $CmdId = $_POST['CMDID']; $UserName = $_POST['CUserName']; $OrderName = $_POST['COrderName']; if($UserName != 'lygk') { $result = 'Fail'; $resultpara = 2; //将数据存储到数据中 $arr = array( 'CMDID' => $CmdId, 'SUserName' => $UserName, 'SResult'=>$result, 'SResultPara' =>$resultpara ); //将数组转成json格式进行传递 $strr = json_encode($arr); } else { $result = 'Success'; $resultpara = 1; //将数据存储到数据中 $arr = array( 'CMDID' => $CmdId, 'SUserName' => $UserName, 'SResult'=>$result, 'SResultPara' =>$resultpara ); //将数组转成json格式进行传递 $strr = json_encode($arr); } echo($strr);?>
运行软件,点击“发送请求”按钮后,从LogCat可以看到运行信息,WEB服务器已经成功响应处理了Android客户端发送的请求。
结尾
本章主要介绍了Android客户端与WEB服务端的交互,贴的源码比较多,发现讲的原理少,其中个中细节,请君自行品味查阅。Android客户端源码,点此下载
/*****************************************************************************************************
*鲁阳高科工作室
*网 址:www.bigbearking.com
*商务合作QQ:1519190237
*业 务 范 围:网站建设、桌面软件开发、Android\IOS开发、图像影视后期处理、PCB设计
****************************************************************************************************/

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