java map转Multipart/form-data类型body实例

 public static String mapToTxt(Map fieldMap, Map fileMap,String fileName) throws Exception{ Random random = new Random(); int j; String getLine = "\r\n"; String fileType = "Content-Type: application/octet-stream"; String doubleBar = "--"; biaoshi = "----WebKitFormBoundary"; StringBuffer sb = new StringBuffer(); for(int i = 0; i <16;i++){ j = random.nextInt(MULTIPART_CHARS.length-2)+2; sb.append(MULTIPART_CHARS[j]); } biaoshi = biaoshi + sb.toString(); StringBuffer stringBuffer = new StringBuffer(); for (Map.Entry entity:fieldMap.entrySet()) { String name = "Content-Disposition: form-data; name=\""+entity.getKey()+"\""; stringBuffer.append(doubleBar+biaoshi); stringBuffer.append(getLine); stringBuffer.append(name); stringBuffer.append(getLine); stringBuffer.append(getLine); stringBuffer.append(entity.getValue()); stringBuffer.append(getLine); } for (Map.Entry entity:fileMap.entrySet()) { String name = "Content-Disposition: form-data; name=\""+fileName+"\"; filename=\""+entity.getValue().getName()+"\""; stringBuffer.append(doubleBar+biaoshi); stringBuffer.append(getLine); stringBuffer.append(name); stringBuffer.append(getLine); stringBuffer.append(fileType); stringBuffer.append(getLine); stringBuffer.append(getLine); File f = entity.getValue(); FileInputStream fileInputStream = new FileInputStream(f); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); byte by[] = new byte[1024]; int k = 0; while ((k=fileInputStream.read(by))!=-1){ byteArrayOutputStream.write(by,0,k); } by = byteArrayOutputStream.toByteArray(); for(int i = 0; i 

 public Map Test(HttpServletRequest request,HttpServletRequest response) throws Exception { Map returnMap = new HashMap(); String a=request.getParameter("a");//取出form-data中a的值 String b=request.getParameter("b");//取出form-data中a的值 //取出form-data中的二进制字段 MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest) request; MultipartFile multipartFile = multipartRequest.getFile("file");//file是form-data中二进制字段对应的name System.out.println(multipartFile.getSize()); Map resultMapsReturn = new HashMap<>(); String imagePath="C:\\Users\\win\\Desktop\\1.jpg-600"//把取出来的二进制保存图片到本地 if(multipartFile.getSize()<=0){ resultMapsReturn.put("resultcode", "0"); resultMapsReturn.put("msg", DisWebConst.ERROR_TITLE); }else{ InputStream is = multipartFile.getInputStream(); OutputStream out = new FileOutputStream(imagePath); IOUtils.copy(is, out); is.close(); out.close(); }