Java实现各种文件类型转换方式(收藏) Java实现各种文件类型转换方式

1.网络资源转File
2.网络资源转MultipartFile
3.File转MultipartFile
4.File转字节数组
5.Frame转BufferedImage
6.BufferedImage转MultipartFile

1.网络资源转File 需要引入依赖commons-io

/*** 读取网络中的图片* @param url https://www.kziyue.com/wp-content/uploads/2019/06/5bca-hxyuaph9825616.jpg* @return*/public File URLToFile(String url){File file1 = new File("test.png"); try { URL url1 = new URL(url); FileUtils.copyURLToFile(url1,file1); } catch (IOException e) {e.printStackTrace(); }File absoluteFile = file1.getAbsoluteFile(); return file1; }

2.网络资源转MultipartFile 需要引入依赖spring-web

/*** 文件上传* @param urlStr url地址* @return multipartFile*/public MultipartFile fileUpload(String urlStr) throws Exception {try {//把地址转换成URL对象URL url = new URL(urlStr); //创建http链接HttpURLConnection conn = (HttpURLConnection)url.openConnection(); //设置超时间为3秒conn.setConnectTimeout(3*1000); //防止屏蔽程序抓取而返回403错误conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36)"); //得到输入流InputStream inputStream = conn.getInputStream(); //截取链接中的文件名String fileName= urlStr.substring(urlStr.lastIndexOf("/")+1); MultipartFile multipartFile = new MockMultipartFile(fileName,fileName, ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream); return multipartFile; } catch (Exception e) {e.printStackTrace(); }throw new Exception(); }

3.File转MultipartFile 需要引用的依赖spring-text，httpcore

/*** 文件类型转换** @param filePath 文件file* @return MultipartFile*/public static MultipartFile caseFileToMultipartFile(File filePath) {MultipartFile multipartFile = null; try {log.info("开始进行文件转换"); FileInputStream fileInputStream = new FileInputStream(filePath); multipartFile = new MockMultipartFile(filePath.getName(), filePath.getName(),ContentType.APPLICATION_OCTET_STREAM.toString(), fileInputStream); } catch (IOException e) {e.printStackTrace(); return null; }return multipartFile; }

【Java实现各种文件类型转换方式(收藏)】
4.File转字节数组

/*** 将文件转为字节数组* @param file * @param size 1024* @return*/public static byte[] BufferStreamForByte(File file, int size) {byte[] content = null; try {BufferedInputStream bis = null; ByteArrayOutputStream out = null; try {FileInputStream input = new FileInputStream(file); bis = new BufferedInputStream(input, size); byte[] bytes = new byte[1024]; int len; out = new ByteArrayOutputStream(); while ((len = bis.read(bytes)) > 0) {out.write(bytes, 0, len); } bis.close(); content = out.toByteArray(); } finally {if (bis != null) {bis.close(); }if (out != null) {out.close(); }}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace(); }return content; }

5.Frame转BufferedImage 需要引入依赖javacv

public static BufferedImage FrameToBufferedImage(Frame frame) {//创建BufferedImage对象Java2DFrameConverter converter = new Java2DFrameConverter(); BufferedImage bufferedImage = converter.getBufferedImage(frame); return bufferedImage; }

6.BufferedImage转MultipartFile

public static MultipartFile fileCase(BufferedImage image){//得到BufferedImage对象// BufferedImage bufferedImage = JoinTwoImage.testEncode(200, 200, url); MultipartFile multipartFile= null; try {//创建一个ByteArrayOutputStreamByteArrayOutputStream os = new ByteArrayOutputStream(); //把BufferedImage写入ByteArrayOutputStreamImageIO.write(image, "jpg", os); //ByteArrayOutputStream转成InputStreamInputStream input = new ByteArrayInputStream(os.toByteArray()); //InputStream转成MultipartFilemultipartFile =new MockMultipartFile("file", "file.jpg", "text/plain", input); } catch (IOException e) {e.printStackTrace(); }return multipartFile; }

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