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http 上传文件的方法
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/** * * sendMultipartDataToHttpServer * 使用post方法请求web服务器,并且当表单数据为:multipart/form-data格式。http请求使用{ @link #HTTP_ENCODING}编码<br/> * 返回json数据,支持文件名中文上传和多文件上传,不支持断点上传,要正确编码服务端返回{ @link #HTTP_ENCODING}编码<br/> * @param url * @param files 文件表单域 * @param fields 非文件表单域 * @return JSONObject * @throws Exception * @exception * @since 1.0.0 */ public static JSONObject sendMultipartDataToHttpServer(URL url, final Map<String, File> files, final Map<String, String> fields, final UsernamePasswordCredentials credentials) throws IOException ,JSONException,Exception{ URL myurl = null ; String queryString = "" ;
// 其他的表单域 if (fields != null ) { for (Map.Entry<String, String> entry : fields.entrySet()) { queryString += "&" + URLEncoder.encode(entry.getKey(),HTTP_ENCODING) + "=" + URLEncoder.encode(entry.getValue(), HTTP_ENCODING); } } if (!queryString.equals("" )) { queryString = queryString.replaceFirst("&", "?" ); } else { } myurl = new URL(url.getProtocol(), url.getHost(),url.getPort(), url.getPath() + queryString); HttpURLConnection conn = (HttpURLConnection) myurl.openConnection(); conn.setConnectTimeout(UPLOAD_REQUEST_TIMEOUT); conn.setRequestMethod(HTTP_METHOD.POST.toString()); conn.setDoInput( true ); conn.setDoOutput( true ); conn.setUseCaches( false );
String boundary
= "laohuidi_" + java.util.UUID.randomUUID().toString() + "_laohuidi" ; conn.setRequestProperty( "Accept" , "image/gif,image/x-xbitmap,image/jpeg,image/pjpeg,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,application/x-shockwave-flash,application/x-quickviewplus,*/*" ); conn.setRequestProperty("keep-alive", "300" ); conn.setRequestProperty( "user-agent" , "Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 GTB6" ); conn.setRequestProperty("accept-language", "zh-cn,zh;q=0.5" ); conn.setRequestProperty("Connection", "Keep-Alive" ); conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+ boundary); DataOutputStream dos = new DataOutputStream(conn.getOutputStream()); // 乱码问题 可以试下 PrintWriter out = new PrintWriter(new // OutputStreamWriter(connection.getOutputStream(),"utf-8")); dos = new DataOutputStream(conn.getOutputStream()); int bytesRead, bytesAvailable, bufferSize; byte [] buffer; int maxBufferSize = IO_BUFFER_SIZE; String tem = "" ; if(files!= null ) for (Map.Entry<String, File> entry : files.entrySet()){ // 分隔符开头 dos.writeBytes(TWO_HYPHENS + boundary + LINEND); // create a buffer of maximum size FileInputStream fileInputStream = new FileInputStream(entry.getValue()); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); buffer = new byte [bufferSize]; // read file and write it into form... bytesRead = fileInputStream.read(buffer, 0 , bufferSize); tem = entry.getValue().getName(); dos.writeBytes("Content-Disposition:form-data;name=\""+entry.getKey()+"\";"+ "filename=\"" ); dos.writeUTF(tem); // 中文的文件名使用这里 dos.writeBytes("\"" + LINEND); dos.writeBytes("Content-Type:image/jpg" + LINEND + LINEND); // 类型的判断暂时不处理 while (bytesRead > 0 ) { dos.write(buffer, 0 , bufferSize);    bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); bytesRead = fileInputStream.read(buffer, 0 , bufferSize); } // close streams fileInputStream.close(); dos.writeBytes(LINEND); } // http 结束符 dos.writeBytes(TWO_HYPHENS + boundary + TWO_HYPHENS); dos.writeBytes(LINEND); dos.flush(); dos.close(); // 返回类型 String responseType = conn.getHeaderField("Content-Type" ); // 正常返回而且必须为json类型 if (conn.getResponseCode() == HttpURLConnection.HTTP_OK && responseType != null && responseType.indexOf(HTTP_JSON_TYPE) >= 0 ) { responseType = (convertStreamToString(conn.getInputStream())); } else { responseType = "{}" ; } try{conn.disconnect();} catch (Exception e){} return new JSONObject(responseType); }

 

 


原文链接:http://www.cnblogs.com/vus520/archive/2012/05/29/2561986.html
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长平狐
发帖于5年前 0回/465阅
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