基于标准的http来实现Android多文件上传
实现多文件的上传，基于标准的http来实现。
- 多文件上传MyUploader类的实现：
/** * * 同步上传多个文件 * 基于标准的http实现，需要在非UI线程中调用，以免阻塞UI。 * */ public class MyUploader { private static final String TAG = "MyUploader"; // ////////////////////同步上传多个文件///////// /** * 同步上传File * * @param Url * @param fullFileName * : 全路径，ex. /sdcard/f/yh.jpg * @param fileName * : file name, ex. yh.jpg * @return 服务器的响应结果(字符串形式) */ public String MyUploadMultiFileSync(String Url, List<String> fileList, Map<String, String> params) { String reulstCode = ""; String end = "\r\n"; String twoHyphens = "--"; String boundary = "--------boundary"; try { URL url = new URL(actionUrl); HttpURLConnection con = (HttpURLConnection) url.openConnection(); // 允许Input、Output，不使用Cache con.setDoInput(true); con.setDoOutput(true); con.setUseCaches(false); // 设置传送的method=POST con.setRequestMethod("POST"); // setRequestProperty con.setRequestProperty("Connection", "Keep-Alive"); con.setRequestProperty("Charset", "UTF-8"); // con.setRequestProperty("Content-Type", // "application/x-www-form-urlencoded"); con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary); StringBuffer s = new StringBuffer(); // 设置DataOutputStream DataOutputStream dos = new DataOutputStream(con.getOutputStream()); for (int i = 0; i < fileList.size(); i++) { String filePath = fileList.get(i); int endFileIndex = filePath.lastIndexOf("/"); String fileName = filePath.substring(endFileIndex + 1); Log.i(TAG, "filename= " + fileName); // set 头部 StringBuilder sb = new StringBuilder(); sb.append(twoHyphens); sb.append(boundary); sb.append(end); sb.append("Content-Disposition: form-data; "); sb.append("name=" + "\"" + "upload_file" +i + "\""); sb.append(";filename="); sb.append("\"" + fileName + "\""); sb.append(end); sb.append("Content-Type: "); sb.append("image/jpeg"); sb.append(end); sb.append(end); // 1. write sb dos.writeBytes(sb.toString()); // 取得文件的FileInputStream FileInputStream fis = new FileInputStream(filePath); // 设置每次写入1024bytes int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; int length = -1; // 从文件读取数据至缓冲区 while ((length = fis.read(buffer)) != -1) { dos.write(buffer, 0, length); } dos.writeBytes(end); fis.close(); dos.writeBytes(end); dos.writeBytes(end); //dos.writeBytes(end); //dos.flush(); // close streams //fis.close(); } // set 尾部 StringBuilder sb2 = new StringBuilder(); if (params != null && !params.isEmpty()) { for (String key : params.keySet()) { String value = params.get(key); sb2.append(twoHyphens); sb2.append(boundary); sb2.append(end); sb2.append("Content-Disposition: form-data; "); sb2.append("name=" + "\""); sb2.append(key + "\""); sb2.append(end); sb2.append(end); sb2.append(value); sb2.append(end); } } sb2.append(twoHyphens + boundary + end); dos.writeBytes(sb2.toString()); dos.flush(); Log.i(TAG, "sb2:" + sb2.toString()); // 取得Response内容 InputStream is = con.getInputStream(); int ch; StringBuffer b = new StringBuffer(); while ((ch = is.read()) != -1) { b.append((char) ch); } reulstCode = b.toString().trim(); // 关闭 dos.close(); } catch (IOException e) { Log.i(TAG, "IOException: " + e); e.printStackTrace(); } return reulstCode; } } 2. 调用方法：
由于MyUploader的MyUploadMultiFileSync本身是同步的函数请求，所以，这个函数需要在非UI线程中执行。本例采用Thread+Handler的方式来进行说明。
下面是activity的主要代码,功能是将cache目录中的的jpg文件上传到指定的服务器：
public void uploadThreadTest() { new Thread(new Runnable() { @Override public void run() { try { upload(); } catch (Exception e) { e.printStackTrace(); } } }).start(); } private void upload() { String url = "https://httpbin.org/post"; List<String> fileList = getCacheFiles(); if (fileList == null) { myHandler.sendEmptyMessage(-1); }else { MyUploader myUpload = new MyUploader(); //同步请求，直接返回结果，根据结果来判断是否成功。 String reulstCode = myUpload.MyUploadMultiFileSync(url, fileList, null); Log.i(TAG, "upload reulstCode: " + reulstCode); myHandler.sendEmptyMessage(0); } } private List<String> getCacheFiles() { List<String> fileList = new ArrayList<String>(); File catchPath = mContext.getCacheDir(); if (catchPath!=null && catchPath.isDirectory()) { File[] files = catchPath.listFiles(); if (files == null || files.length<1) { return null; } for (int i = 0; i < files.length; i++) { if (files[i].isFile() && files[i].getAbsolutePath().endsWith(".jpg")) { fileList.add(files[i].getAbsolutePath()); } } return fileList; } return null; } ////////////handler///// private Handler myHandler = new Handler() { @Override public void handleMessage(Message msg) { Log.i(TAG,"handleMessage msg===" + msg); if (msg.what == -1) { Toast.makeText(mContext, "not find file!", Toast.LENGTH_LONG).show(); return; }else { Toast.makeText(mContext, "upload success!", Toast.LENGTH_LONG).show(); } } };