关于混编格式
multipart/form-data官方介绍
关于Java UUID
package com.example.pmudemo.helper; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.UUID; import android.util.Log; /** * Message upload helper class * * @author weishijie * */ public class UploadHelper { private static final String TAG = "UploadHelper"; /** * Timeout */ private static final int TIME_OUT = 5 * 1000; /** * Charset */ private static final String CHARSET = "utf-8"; /** * Upload file to server * 本方法采用“混编格式”实现上传 * 混编格式,即混合多种资料格式并一次传送,当然非文字资料必须要编码为二进制字符串 * 参考:http://www.cnblogs.com/shanyou/archive/2013/06/07/3123155.html * * @param file file need to upload * @param RequestURL request url * @return response string */ public static String uploadFile(File file, String requestURL) { String result = null; /*UUID(Universally Unique Identifier)全局唯一标识符,是指在一台机器上生成的数字, 它保证对在同一时空(3240年)中的所有机器都是唯一的。UUID一般形如下例: 550E8400-E29B-11D4-A716-446655440000*/ // 边界标识 随机生成 String BOUNDARY = UUID.randomUUID().toString(); String PREFIX = "--"; String LINE_END = "\r\n"; String CONTENT_TYPE = "multipart/form-data"; try { URL url = new URL(requestURL); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout(TIME_OUT); conn.setConnectTimeout(TIME_OUT); // Allow input conn.setDoInput(true); // Allow output conn.setDoOutput(true); // Forbidden cache conn.setUseCaches(false); conn.setRequestMethod("POST"); // Set request header field conn.setRequestProperty("Charset", CHARSET); conn.setRequestProperty("connection", "keep-alive"); conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY); if (file != null) { /** * 当文件不为空,把文件包装并且上传 */ DataOutputStream dos = new DataOutputStream( conn.getOutputStream()); StringBuffer sb = new StringBuffer(); sb.append(PREFIX); sb.append(BOUNDARY); sb.append(LINE_END); /** * 这里重点注意: name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件 * filename是文件的名字,包含后缀名的 比如:abc.png */ sb.append("Content-Disposition: form-data; name=\"log\"; filename=\"" + file.getName() + "\"" + LINE_END); sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END); sb.append(LINE_END); dos.write(sb.toString().getBytes()); InputStream is = new FileInputStream(file); byte[] bytes = new byte[1024]; int len = 0; while ((len = is.read(bytes)) != -1) { dos.write(bytes, 0, len); } is.close(); dos.write(LINE_END.getBytes()); byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END) .getBytes(); dos.write(end_data); dos.flush(); /** * 获取响应码 200=成功 当响应成功,获取响应的流 */ int res = conn.getResponseCode(); Log.i(TAG, "response code:" + res); Log.i(TAG, "request success"); InputStream input = conn.getInputStream(); StringBuffer sb1 = new StringBuffer(); int ss; while ((ss = input.read()) != -1) { sb1.append((char) ss); } result = sb1.toString(); Log.i(TAG, "result : " + result); }else{ return null; } } catch (MalformedURLException e) { e.printStackTrace(); return null; } catch (IOException e) { e.printStackTrace(); return null; } catch (Exception e) { e.printStackTrace(); return null; } return result; } }