java之上传文件
2021/8/9 12:35:58
本文主要是介绍java之上传文件,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
依赖pom.xml
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.4</version> </dependency>
Spring bean配置
<!--文件上传id必须=multipartResolver--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!--请求的编码格式,必须和jsp的pageEncoding属性一致,以便正确读取表单的内容,默认为ISO-8859-1--> <property name="defaultEncoding" value="utf-8"/> <!--上传文件大小上限,单位为字节10485760=10M--> <property name="maxUploadSize" value="10485760"/> <property name="maxInMemorySize" value="40960"/> </bean>
代码
@PostMapping("/article/upload1Handler") public String upload1Handler(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException { String uploadFileName = file.getOriginalFilename(); if ("".equals(uploadFileName)){ return "redirect:/article/index"; } System.out.println("上传文件名:" + uploadFileName); String path = request.getServletContext().getRealPath("/upload"); File realPath = new File(path); if (!realPath.exists()) { realPath.mkdir(); } System.out.println("上传文件地址:" + realPath); InputStream is = file.getInputStream();//文件输入流 BufferedInputStream bis = new BufferedInputStream(is); OutputStream os = new FileOutputStream(new File(realPath,uploadFileName));//文件输出流 BufferedOutputStream bos = new BufferedOutputStream(os); byte[] buffer = new byte[1024]; int len = 0; while ((len = is.read(buffer)) != -1) { bos.write(buffer, 0, len); } bis.close(); bos.close(); return "redirect:/article/index"; } @PostMapping("/article/upload2Handler") public String upload2Handler(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException { String path = request.getServletContext().getRealPath("/upload"); File realPath = new File(path); if (!realPath.exists()) { realPath.mkdir(); } System.out.println("上传文件地址:" + realPath); //通过CommonsMultipartFile的方法直接写文件 file.transferTo(new File(realPath + "/" + file.getOriginalFilename())); return "redirect:/article/index"; }
视图
<form action="/article/upload2Handler" method="post" enctype="multipart/form-data"> <input type="file" name="file"/> <button type="submit">Submit</button> </form>
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