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javamap如何轉(zhuǎn)Multipart/form-data類型

這篇文章主要為大家展示了java map如何轉(zhuǎn)Multipart/form-data類型,內(nèi)容簡(jiǎn)而易懂,希望大家可以學(xué)習(xí)一下,學(xué)習(xí)完之后肯定會(huì)有收獲的,下面讓小編帶大家一起來看看吧。

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我就廢話不多說了,大家還是直接看代碼吧!

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 < by.length; i++){
				stringBuffer.append(by[i]);
			}
			stringBuffer.append(getLine);
		}
		stringBuffer.append(doubleBar+biaoshi+doubleBar);
		return stringBuffer.toString();
	}

補(bǔ)充知識(shí):java 如何取出傳參數(shù)格式為form-data中的值

 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中的二進(jìn)制字段
    MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest) request; 
    MultipartFile multipartFile = multipartRequest.getFile("file");//file是form-data中二進(jìn)制字段對(duì)應(yīng)的name
    System.out.println(multipartFile.getSize());  
    Map resultMapsReturn = new HashMap<>();
    String imagePath="C:\\Users\\win\\Desktop\\1.jpg"http://把取出來的二進(jìn)制保存圖片到本地
    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();
    }

以上就是關(guān)于java map如何轉(zhuǎn)Multipart/form-data類型的內(nèi)容,如果你們有學(xué)習(xí)到知識(shí)或者技能,可以把它分享出去讓更多的人看到。


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