在android开发如何上传文件到服务器，这里使用http的post方法（不懂的东西可以上网补习一下）上传一个图片，给出了android部分代码和服务器部分代码。

andorid端

FileUploadTask是完成文件上传的类。

package com.android.TVwidget;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;class FileUploadTask extends AsyncTask<Object, Integer, Void> {  String urlServer;private String pathToOurFile;      long totalSize = 0;    HttpURLConnection connection = null;      DataOutputStream outputStream = null;      DataInputStream inputStream = null;        String TAG = "FileUploadTask";    String lineEnd = "\r\n";      String twoHyphens = "--";      String boundary = "*****";    private Handler handler;        public Handler setHandler(Handler hdl)    {    this.handler = hdl;    return this.handler;    }    protected void init(String path, String server) {      File uploadFile;     pathToOurFile = path;    uploadFile = new File(pathToOurFile);      Log.i(TAG,"pathToOurFile = "+pathToOurFile);    totalSize = uploadFile.length();    Log.i(TAG,"totalSize = "+totalSize);    urlServer = server;    return ;    }        @Override      protected void onPreExecute() {         /*文件上传提示*/        Log.i(TAG, "onPreExecute");    }      /*后台执行文件上传*/    @Override      protected Void doInBackground(Object... arg0) {          long length = 0;          int progress;          int bytesRead, bytesAvailable, bufferSize;          byte[] buffer;          int maxBufferSize = 256 * 1024;          try {              FileInputStream fileInputStream = new FileInputStream(new File(                      pathToOurFile));              Log.i(TAG," doInBackground urlServer ="+urlServer);/*http链接参数设置*/            URL url = new URL(urlServer);              connection = (HttpURLConnection) url.openConnection();              connection.setChunkedStreamingMode(256 * 1024);             connection.setDoInput(true);              connection.setDoOutput(true);              connection.setUseCaches(false);               connection.setRequestMethod("POST");              connection.setRequestProperty("Charset", "UTF-8");              connection.setRequestProperty("Content-Type",                      "multipart/form-data;boundary=" + boundary);              outputStream = new DataOutputStream(                      connection.getOutputStream());              outputStream.writeBytes(twoHyphens + boundary + lineEnd);              outputStream                      .writeBytes("Content-Disposition: form-data;name=\"img\";filename=\""                              + pathToOurFile + "\"" + lineEnd);              outputStream.writeBytes(lineEnd);              bytesAvailable = fileInputStream.available();              bufferSize = Math.min(bytesAvailable, maxBufferSize);              buffer = new byte[bufferSize];              // Read file               bytesRead = fileInputStream.read(buffer, 0, bufferSize);              while (bytesRead > 0) {                  outputStream.write(buffer, 0, bufferSize);                  length += bufferSize;                  progress = (int) ((length * 100) / totalSize);                  publishProgress(progress);                  bytesAvailable = fileInputStream.available();                  bufferSize = Math.min(bytesAvailable, maxBufferSize);                  bytesRead = fileInputStream.read(buffer, 0, bufferSize);              }              outputStream.writeBytes(lineEnd);              outputStream.writeBytes(twoHyphens + boundary + twoHyphens                      + lineEnd);              publishProgress(100);                         InputStream is = connection.getInputStream();               int ch;               StringBuffer sbf = new StringBuffer();               while ((ch = is.read()) != -1) {               sbf.append((char) ch);               }               fileInputStream.close();              outputStream.flush();              outputStream.close();                        /*图片完成上传后发送消息*/            Message message = new Message();               Bundle b =new Bundle();                               b.putString("textStr", "finished-upload");                                                            message.setData(b);             this.handler.sendMessage(message);         } catch (Exception ex) {           }          return null;      }      @Override      protected void onProgressUpdate(Integer... progress) {          //dialog.setProgress(progress[0]);      }      @Override      protected void onPostExecute(Void result) {          try {              //dialog.dismiss();              // TODO Auto-generated method stub           } catch (Exception e) {          }      }  }

类的使用

/*消息接收器*/ Handler handler = new Handler(){  /* (non-Javadoc)   * @see android.os.Handler#handleMessage(android.os.Message)   */  @Override  public void handleMessage(Message msg) {   Bundle b=msg.getData(); String textStr=b.getString("textStr"); Log.i(TAG, "textStr is: "+textStr);  /*图片上传完成消息*/ if(textStr!=null&&textStr.equals("finished-upload")) {  mWebView.loadUrl("javascript:uploadFileFinished()");  } else {  // TODO Auto-generated method stub   Toast.makeText(getApplicationContext(), "截屏成功", Toast.LENGTH_LONG).show(); }   super.handleMessage(msg);  }  };...FileUploadTask fileUploadTask = new FileUploadTask();        fileUploadTask.init(fullname, api);        fileUploadTask.setHandler(handler);        fileUploadTask.execute();...

创建一个图片上传的任务然后进行初始化init，初始化参数fullname是文件全名如“/mnt/usb/sad1/pic1.jpg”,api是服务器接收图片的api如我实现的api是

“http://192.168.1.5:8080/clive-demo/api/v1/recommend?userId=123”

两参数都是字符类型。

然后创建一个消息接收器handler,接收图片上传完成的消息：

finished-upload

服务器端

@RequestMapping(value="recommend",method = RequestMethod.POST)public @ResponseBody String recommend(@RequestParam(value="userId") String userId,@RequestParam(value="img",required=false) MultipartFile img){logger.debug("saving");//imageDao.save(img);return "ok";}

这里只是实现一个接收接口。

android通过http上传文件（图片）

andorid端

服务器端

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