Java中用Socket实现HTTP文件上传实例

public void parseRequest() { 
  LineNumberReader br = new LineNumberReader(new InputStreamReader(inputStream)); 
  StringBuffer sb = new StringBuffer(); 
  String str = null; 
  try { 
    //读取请求行 
    String requestLine = br.readLine(); 
    if (!StringUtils.isEmpty(requestLine)) { 
      sb.append(requestLine); 
      String[] reqs = requestLine.split(" "); 
      if (reqs != null && reqs.length > 0) { 
        if ("GET".equals(reqs[0])) { 
          method = "GET"; 
        } else { 
          method = "POST"; 
        } 
      } 
    } 
    //读取请求头 
    while ((str = br.readLine()) != null) { 
      if ("".equals(str)) { 
        break; 
      } 
      if (!StringUtils.isEmpty(str)) { 
        if (str.indexOf(":") > 0) { 
          String[] strs = str.split(":"); 
          headers.put(strs[0].toLowerCase(), strs[1].trim()); 
        } 
      } 
      sb.append(str).append("\n"); 
    } 
    //POST请求，Content-type为 multipart/form-data 
    String contentType = null; 
    if ("POST".equals(method) && ((contentType = headers.get("content-type")) != null 
        && headers.get("content-type").startsWith("multipart/form-data"))) { 
      //文件上传的分割位 这里只处理单个文件的上传 
      String boundary = contentType.substring(contentType.indexOf("boundary") + 
          "boundary=".length()); 
      //解析消息体 
      while ((str = br.readLine()) != null) { 
        //解析结束的标记 
        do { 
          //读取boundary中的内容 
          //读取Content-Disposition 
          str = br.readLine(); 
          //说明是文件上传 
          if (str.indexOf("Content-Disposition:") >= 0 && str.indexOf("filename") > 0) { 
            str = str.substring("Content-Disposition:".length()); 
            String[] strs = str.split(";"); 
            String fileName = strs[strs.length - 1].replace("\"", "").split("=")[1]; 
            System.out.println("fileName = " + fileName); 
            //这一行是Content-Type 
            br.readLine(); 
            //这一行是换行 
            br.readLine(); 
            //正式去读文件的内容 
            BufferedWriter bw = null; 
            try { 
              bw = new BufferedWriter(new OutputStreamWriter(new 
                  FileOutputStream("G:\\LearnVideo\\fileLoad" + 
                  File.separator + fileName), "UTF-8")); 
              while (true) { 
                str = br.readLine(); 
                if (str.startsWith("--" + boundary)) { 
                  break; 
                } 
                bw.write(str); 
                bw.newLine(); 
              } 
              bw.flush(); 
            } catch (Exception e) { 
 
            } finally { 
              if (bw != null) { 
                bw.close(); 
              } 
            } 
          } 
          if (str.indexOf("Content-Disposition:") >= 0) { 
            str = str.substring("Content-Disposition:".length()); 
            String[] strs = str.split(";"); 
            String name = strs[strs.length - 1].replace("\"", "").split("=")[1]; 
            br.readLine(); 
            StringBuilder stringBuilder = new StringBuilder(); 
            while (true) { 
              str = br.readLine(); 
              if (str.startsWith("--" + boundary)) { 
                break; 
              } 
              stringBuilder.append(str); 
            } 
            parameters.put(name, stringBuilder.toString()); 
          } 
        } while (("--" + boundary).equals(str)); 
        //解析结束 
        if (str.equals("--" + boundary + "--")) { 
          break; 
        } 
      } 
    } 
    //System.out.println(sb.toString()); 
    //获取URI 
    uri = StringUtils.parserUri(sb.toString(), " "); 
    int flag = -1; 
    //说明有参数 
    if ((flag = uri.indexOf('?')) >= 0) { 
      String oldUri = uri; 
      uri = uri.substring(0,flag); 
      String parameterPath = oldUri.substring(flag+1); 
      String[] parameter = parameterPath.split("&"); 
      if (parameter != null && parameter.length > 0) { 
        for (int i = 0; i < parameter.length; i++) { 
          String str1 = parameter[i]; 
          if((flag = str1.indexOf('=')) >= 0){ 
            String key = str1.substring(0,flag); 
            String value = str1.substring(flag+1); 
            parameters.put(key,value); 
          }else{ 
            parameters.put(str,null); 
          } 
        } 
      } 
    } 
  } catch (IOException e) { 
    e.printStackTrace(); 
  } 
}