这篇文章主要为大家展示了java map如何转Multipart/form-data类型，内容简而易懂，希望大家可以学习一下，学习完之后肯定会有收获的，下面让小编带大家一起来看看吧。

我就废话不多说了，大家还是直接看代码吧！

public static String mapToTxt(Map<String,String> fieldMap, Map<String,File> 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<String,String> 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<String,File> 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 < by.length; i++){stringBuffer.append(by[i]);}stringBuffer.append(getLine);}stringBuffer.append(doubleBar+biaoshi+doubleBar);return stringBuffer.toString();}

补充知识：java 如何取出传参数格式为form-data中的值

public Map<String, Object> Test(HttpServletRequest request,HttpServletRequest response) throws Exception { Map<String, String> returnMap = new HashMap<String, String>(); 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<String, Object> resultMapsReturn = new HashMap<>(); String imagePath="C:\\Users\\win\\Desktop\\1.jpg"//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(); }

以上就是关于java map如何转Multipart/form-data类型的内容，如果你们有学习到知识或者技能，可以把它分享出去让更多的人看到。