Android开发片段–POST上传和数据提交

public static String post(String actionUrl, Map<String, String> params, 
	    Map<String, File> files) throws IOException { 
	  StringBuilder sb2 = new StringBuilder(); 
	  String BOUNDARY = java.util.UUID.randomUUID().toString();
	  String PREFIX = "--" , LINEND = "\r\n";
	  String MULTIPART_FROM_DATA = "multipart/form-data"; 
	  String CHARSET = "UTF-8";

	  URL uri = new URL(actionUrl); 
	  HttpURLConnection conn = (HttpURLConnection) uri.openConnection(); 
	  conn.setReadTimeout(5 * 1000); 
	  conn.setDoInput(true);
	  conn.setDoOutput(true);
	  conn.setUseCaches(false); 
	  conn.setRequestMethod("POST"); 
	  conn.setRequestProperty("connection", "keep-alive"); 
	  conn.setRequestProperty("Charsert", "UTF-8"); 
	  conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY); 

	  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()); 
	  if(files!=null){
	    //int i = 0;
	    for (Map.Entry<String, File> file: files.entrySet()) { 
	      StringBuilder sb1 = new StringBuilder(); 
	      sb1.append(PREFIX); 
	      sb1.append(BOUNDARY); 
	      sb1.append(LINEND); 
	      sb1.append("Content-Disposition: form-data; name=\"file"+(i++)+"\"; filename=\""+file.getKey()+"\""+LINEND);
	      //sb1.append("Content-Disposition: form-data; name=\"userupfile\"; filename=\""+file.getKey()+"\""+LINEND);
	      sb1.append("Content-Type: application/octet-stream; charset="+CHARSET+LINEND);
	      sb1.append(LINEND);
	      outStream.write(sb1.toString().getBytes()); 

	      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); 
	      }

	      is.close(); 
	      outStream.write(LINEND.getBytes()); 
	    } 
	  }
	  
	  byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes(); 
	  outStream.write(end_data); 
	  outStream.flush(); 

	  int res = conn.getResponseCode(); 
	  InputStream in = null;
	  if (res == 200) {
	    in = conn.getInputStream(); 
	    int ch; 
	    
	    while ((ch = in.read()) != -1) { 
	      sb2.append((char) ch); 
	    } 
	    Log.i("CAMERA", sb2.toString());
	  }
	  
	  return in == null ? null : sb2.toString(); 
	}