Android中http请求（C# MVC接收）

Android 开发中很多涉及网络通信，因为项目中涉及过一次，当时实现方式是 Http 请求，服务器端为 C# MVC 实现，所以这里想对这种方式进行一个总结。

Android 客户端：

首先封装一个 Http 请求帮助类

HttpHelper.java

package com.iflytek.leting.net;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import java.util.List;import java.util.Map;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.CookieStore;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.AbstractHttpClient;import org.apache.http.impl.client.DefaultHttpClient;import android.util.Log;public abstract class HttpHelper {    private final static String TAG = "HttpHelper";    private final static String SERVER_URL = "http://10.0.0.3/Test/";private static CookieStore cookieStore;/** * @descrption 上传可变参数的Http请求方法 * @author xdwang * @create 2012-9-27下午8:06:28 * @param controllerName C# MVC中的controller * @param actionName C# MVC中的action * @param params 可变参数 * @return */public static String invoke(String controllerName, String actionName,List<NameValuePair> params) {String result = null;try {String url = SERVER_URL + controllerName + "/" + actionName + "/";Log.d(TAG, "url is" + url);HttpPost httpPost = new HttpPost(url);if (params != null && params.size() > 0) {HttpEntity entity = new UrlEncodedFormEntity(params, "UTF-8");httpPost.setEntity(entity);}DefaultHttpClient httpClient = new DefaultHttpClient();// 添加Cookieif (cookieStore != null) {httpClient.setCookieStore(cookieStore);}HttpResponse httpResponse = httpClient.execute(httpPost);StringBuilder builder = new StringBuilder();BufferedReader reader = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent()));for (String s = reader.readLine(); s != null; s = reader.readLine()) {builder.append(s);}result = builder.toString();Log.d(TAG, "result is ( " + result + " )");// 保存CookiecookieStore = ((AbstractHttpClient) httpClient).getCookieStore();} catch (Exception e) {Log.e(TAG, e.toString());}Log.d(TAG, "over");return result;}public static String invoke(String controllerName, String actionName) {return invoke(controllerName, actionName, null);}/** * @descrption 通过拼接的方式构造请求内容，实现参数传输以及文件传输 * @author xdwang * @create 2012-9-27下午7:06:20 * @param controllerName *            .NETMVC中的controllerName * @param actionName *            .NETMVC中的actionName * @param params *            key：为C#方法接受的参数，value为参数值，支持多个参数 * @param files *            key：为C#方法接受的参数，不要重复，value为参数值，支持上传多个附件 * @return * @throws IOException */public static String httpPostByte(String controllerName, String actionName,Map<String, String> params, Map<String, byte[]> files)throws IOException {String BOUNDARY = java.util.UUID.randomUUID().toString();String PREFIX = "--", LINEND = "\r\n";String MULTIPART_FROM_DATA = "multipart/form-data";String CHARSET = "UTF-8";String url = SERVER_URL + controllerName + "/" + actionName + "/";URL uri = new URL(url);HttpURLConnection conn = (HttpURLConnection) uri.openConnection();conn.setReadTimeout(5 * 1000); // 缓存的最长时间conn.setDoInput(true);// 允许输入conn.setDoOutput(true);// 允许输出conn.setUseCaches(false); // 不允许使用缓存conn.setRequestMethod("POST");conn.setRequestProperty("connection", "keep-alive");conn.setRequestProperty("Charsert", "UTF-8");conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA+ ";boundary=" + BOUNDARY);// 首先组拼文本类型的参数StringBuilder sb = new StringBuilder();for (Map.Entry<String, String> entry : params.entrySet()) {sb.append(PREFIX);sb.append(BOUNDARY);sb.append(LINEND);sb.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"" + LINEND);sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);sb.append("Content-Transfer-Encoding: 8bit" + LINEND);sb.append(LINEND);sb.append(entry.getValue());sb.append(LINEND);}DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());outStream.write(sb.toString().getBytes());// 发送文件数据if (files != null) {for (Map.Entry<String, byte[]> file : files.entrySet()) {StringBuilder sb1 = new StringBuilder();sb1.append(PREFIX);sb1.append(BOUNDARY);sb1.append(LINEND);sb1.append("Content-Disposition: form-data; name=\""+ file.getKey() + "\"; filename=\"" + file.getKey()+ "\"" + LINEND);sb1.append("Content-Type: application/octet-stream; charset="+ CHARSET + LINEND);sb1.append(LINEND);outStream.write(sb1.toString().getBytes());//这里如何是File对象，则写成这种形式// InputStream is = new FileInputStream(file.getValue());// byte[] buffer = new byte[1024];// int len = 0;// while ((len = is.read(buffer)) != -1) {// outStream.write(buffer, 0, len);// }outStream.write(file.getValue());// is.close();outStream.write(LINEND.getBytes());}}// 请求结束标志byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();outStream.write(end_data);outStream.flush();// 得到响应码int res = conn.getResponseCode();InputStream in = null;if (res == 200) {in = conn.getInputStream();int ch;StringBuilder sb2 = new StringBuilder();while ((ch = in.read()) != -1) {sb2.append((char) ch);}}return in == null ? null : in.toString();}}

Android 中的调用：

AsyncTask<Void, Void, String> task = new AsyncTask<Void, Void, String>() {/** * 服务器端的返回值处理 */@Overrideprotected void onPostExecute(String result) {Log.d(TAG, result);try {JSONObject json = new JSONObject(result);uuid = json.getString("Result");String picName = "";String picSrc = "";JSONObject picMap = json.getJSONObject("Message");if (json.getJSONObject("Message") != null) {picSrc = picMap.getString("Value");picName = picMap.getString("Key");}} catch (JSONException e) {Log.e(TAG, e.toString());}}@Overrideprotected void onPreExecute() {super.onPreExecute();}/** * 调用Http方法请求服务器端 */@Overrideprotected String doInBackground(Void... arg0) {try {// 直接传普通参数;NameValuePair param = new BasicNameValuePair("uuid", uuid);List<NameValuePair> params = new ArrayList<NameValuePair>();params.add(param);return HttpHelper.invoke("GuessPic", "GetNextPicture", params);// 直接传普通参数和附件;Map<String, String> params = new HashMap<String, String>();params.put("content", contentTemp);params.put("usId", guessPicture.usId);Map<String, byte[]> files = new HashMap<String, byte[]>();files.put("soundBytes", totalBytes);return HttpHelper.httpPostByte("GuessPic", "SaveAudio",params, files);                                 } catch (Exception e) {Log.e(TAG, e.toString());return null;}}};task.execute();

服务器端（C#MVC实现）：

         /// <summary>        /// 下一张图片        /// </summary>        /// <returns></returns>        public JsonResult GetNextPicture(string uuid)        {              ResultMessage<string, KeyValuePair<string, string>> rm = new ResultMessage<string, KeyValuePair<string, string>>();              //….TODO逻辑处理              return Json(rm, JsonRequestBehavior.AllowGet);        }

        /// <summary>        /// 保存上传一个文件和内容        /// </summary>        /// <param name="content">内容</param>        /// <param name="soundBytes">音频文件对象</param>        /// <returns></returns>        public JsonResult SaveAudio(string content, HttpPostedFileBase soundBytes, string usId)        {               ResultMessage<bool, object> rm = new ResultMessage<bool, object>();               byte[] bytes = new byte[soundBytes.InputStream.Length];               soundBytes.InputStream.Read(bytes, 0, bytes.Length);               //….TODO逻辑处理               return Json(rm, JsonRequestBehavior.AllowGet);        }

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