java模拟from表单提交,上传图片
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/** * java上传表单,有图片 * @param urlStr 上传地址 * @param textMap 表单参数 * @param fileMap 文件参数 key:文件名称 value:文件地址 * @return */ @SuppressWarnings("rawtypes") public static String formUpload(String urlStr, Map<String, String> textMap, Map<String, String> fileMap) { String res = ""; HttpURLConnection conn = null; // boundary就是request头和上传文件内容的分隔符 String BOUNDARY = "---------------------------123821742118716"; try { URL url = new URL(urlStr); conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setReadTimeout(30000); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestMethod("POST"); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); OutputStream out = new DataOutputStream(conn.getOutputStream()); // text if (textMap != null) { StringBuffer strBuf = new StringBuffer(); Iterator iter = textMap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry) iter.next(); String inputName = (String) entry.getKey(); String inputValue = (String) entry.getValue(); if (inputValue == null) { continue; } strBuf.append("\r\n").append("--").append(BOUNDARY) .append("\r\n"); strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"\r\n\r\n"); strBuf.append(inputValue); } out.write(strBuf.toString().getBytes()); } // file if (fileMap != null) { Iterator iter = fileMap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry) iter.next(); String inputName = (String) entry.getKey(); String inputValue = (String) entry.getValue(); if (inputValue == null) { continue; } File file = new File(inputValue); String filename = file.getName(); //没有传入文件类型,同时根据文件获取不到类型,默认采用application/octet-stream String contentType = new MimetypesFileTypeMap().getContentType(file); //contentType非空采用filename匹配默认的图片类型 if(!"".equals(contentType)){ if (filename.endsWith(".png")) { contentType = "image/png"; }else if (filename.endsWith(".jpg") || filename.endsWith(".jpeg") || filename.endsWith(".jpe")) { contentType = "image/jpeg"; }else if (filename.endsWith(".gif")) { contentType = "image/gif"; }else if (filename.endsWith(".ico")) { contentType = "image/image/x-icon"; } } if (contentType == null || "".equals(contentType)) { contentType = "application/octet-stream"; } StringBuffer strBuf = new StringBuffer(); strBuf.append("\r\n").append("--").append(BOUNDARY) .append("\r\n"); strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"; filename=\"" + filename + "\"\r\n"); strBuf.append("Content-Type:" + contentType + "\r\n\r\n"); out.write(strBuf.toString().getBytes()); DataInputStream in = new DataInputStream( new FileInputStream(file)); int bytes = 0; byte[] bufferOut = new byte[1024]; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } in.close(); } } byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes(); out.write(endData); out.flush(); out.close(); // 读取返回数据 StringBuffer strBuf = new StringBuffer(); BufferedReader reader = new BufferedReader(new InputStreamReader( conn.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { strBuf.append(line).append("\n"); } res = strBuf.toString(); reader.close(); reader = null; } catch (Exception e) { System.out.println("发送POST请求出错。" + urlStr); e.printStackTrace(); } finally { if (conn != null) { conn.disconnect(); conn = null; } } return res; }
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