Android（五）数据存储之五网络数据交互 3

其中使用到的HttpRequester类：

package com.changcheng.web.client.service;

 

import java.io.DataOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;

import android.util.Log;

 

/**

 * http请求发送器

 */

public class HttpRequester {

         /**

          * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:

          *   <FORM METHOD=POST ACTION="http://192.168.0.200:8080/ssi/fileload/test.do" enctype="multipart/form-data">

                            <INPUT TYPE="text" NAME="name">

                            <INPUT TYPE="text" NAME="id">

                            <input type="file" name="imagefile"/>

                       <input type="file" name="zip"/>

                    </FORM>

          * @param actionUrl 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)

          * @param params 请求参数 key为参数名,value为参数值

          * @param file 上传文件

          */

         public static String post(String actionUrl, Map<String, String> params, FormFile[] files) {

             try {            

                 String BOUNDARY = "---------7d 4a6d158c9"; //数据分隔线

                 String MULTIPART_FORM_DATA = "multipart/form-data";

                

                 URL url = new URL(actionUrl);

                 HttpURLConnection conn = (HttpURLConnection) url.openConnection();

                 conn.setConnectTimeout(6* 1000);

                 conn.setDoInput(true);//允许输入

                 conn.setDoOutput(true);//允许输出

                 conn.setUseCaches(false);//不使用Cache

                 conn.setRequestMethod("POST");               

                 conn.setRequestProperty("Connection", "Keep-Alive");

                 conn.setRequestProperty("Charset", "UTF-8");

                 conn.setRequestProperty("Content-Type", MULTIPART_FORM_DATA + "; boundary=" + BOUNDARY);

 

                 StringBuilder sb = new StringBuilder();

                 for (Map.Entry<String, String> entry : params.entrySet()) {//构建表单字段内容

                     sb.append("--");

                     sb.append(BOUNDARY);

                     sb.append("\r\n");

                     sb.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");

                     sb.append(entry.getValue());

                     sb.append("\r\n");

                 }

                 DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());

                 outStream.write(sb.toString().getBytes());//发送表单字段数据

                 for(FormFile file : files){//发送文件数据

                      StringBuilder split = new StringBuilder();

                          split.append("--");

                          split.append(BOUNDARY);

                          split.append("\r\n");

                          split.append("Content-Disposition: form-data;name=\""+ file.getFormname()+"\";filename=\""+ file.getFilname() + "\"\r\n");

                          split.append("Content-Type: "+ file.getContentType()+"\r\n\r\n");

                          outStream.write(split.toString().getBytes());

                          if(file.getInStream()!=null){

                               byte[] buffer = new byte[1024];

                               int len = 0;

                               while((len = file.getInStream().read(buffer))!=-1){

                                         outStream.write(buffer, 0, len);

                               }

                               file.getInStream().close();

                          }else{

                               outStream.write(file.getData(), 0, file.getData().length);

                          }

                          outStream.write("\r\n".getBytes());

                 }

                 byte[] end_data = ("--" + BOUNDARY + "--\r\n").getBytes();//数据结束标志       

                 outStream.write(end_data);

                 outStream.flush();

                 int cah = conn.getResponseCode();

                 if (cah != 200) throw new RuntimeException("请求url失败");

                 InputStream is = conn.getInputStream();

                 int ch;

                 StringBuilder b = new StringBuilder();

                 while( (ch = is.read()) != -1 ){

                      b.append((char)ch);

                 }

                 Log.i("ItcastHttpPost", b.toString());             

                 outStream.close();

                 conn.disconnect();

                 return b.toString();

             } catch (Exception e) {

                throw new RuntimeException(e);

             }

         }

        

         /**

          * 提交数据到服务器

          * @param actionUrl 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)

          * @param params 请求参数 key为参数名,value为参数值

          * @param file 上传文件

          */

         public static String post(String actionUrl, Map<String, String> params, FormFile file) {

            return post(actionUrl, params, new FormFile[]{file});

         }

        

         /**

          * 提交数据到服务器

          * @param actionUrl 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)

          * @param params 请求参数 key为参数名,value为参数值

          */

         public static String post(String actionUrl, Map<String, String> params) {

                      HttpPost httpPost = new HttpPost(actionUrl);

                      List<NameValuePair> list = new ArrayList<NameValuePair>();

                      for (Map.Entry<String, String> entry : params.entrySet()) {//构建表单字段内容

                               list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));

                      }

                      try {

                            httpPost.setEntity(new UrlEncodedFormEntity(list, HTTP.UTF_8));

                            HttpResponse httpResponse = new DefaultHttpClient().execute(httpPost);

                            if(httpResponse.getStatusLine().getStatusCode() == 200){

                                     return EntityUtils.toString(httpResponse.getEntity());

                       }

                   } catch (Exception e) {

                            throw new RuntimeException(e);

                   }

                   return null; 

    }

}

       我们最好对HTTP协议有深入的了解，这样在编写简单数据交互应用时直接面向HTTP协议编程可以提高运行速度并减少资源的占用。

       我们在最后一个方法中使用到的HttpPost类，是Apache开源组织提供的httpcomponents-client-4.0.1包。httpcomponents-client-4.0.1可以实现浏览器的大部分功能，但如果我们能不使用它就尽量不使用它，因为这会造成对手机硬件资源的占用，从而减慢应用程序的运行速度。

 

       4.测试类

package com.changcheng.web.client.test;

 

import com.changcheng.web.client.service.ClientService;

import android.test.AndroidTestCase;

 

public class TestAndroidClientService extends AndroidTestCase {

 

         public void testSendDataToServerByGet() throws Throwable {

                   ClientService.sendDataToServerByGet();

         }

 

         public void testSendDataToServerByPost() throws Throwable {

                   ClientService.sendDataTOserverByPost();

         }

 

         public void testSendDataToServerByForm() throws Throwable {

                   ClientService.sendDataToServerByForm();

         }

}

 

 

       5.运行

       首先启动AndroidWebService应用程序，然后运行测试方法，查看运行结果。

 

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