pom文件：
<!-- 文件上传 --> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.3.2</version> </dependency>
springmvc里面引入配置：
<!-- 定义文件解释器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 设置默认编码 --> <property name="defaultEncoding" value="utf-8"></property> <!-- 上传图片最大大小500M --> <property name="maxUploadSize" value="524244000"></property> </bean>
上传文件的controller：（注：可以通过partFile.getOriginalFilename()来获取文件的后缀，以此来为文件添加新的名字）
@RequestMapping(value="/upload1",method=RequestMethod.POST) @ResponseBody //注意上传的时候前台的name属性值要和partFile对应，若不对应怎需要加上@RequestParam("file")注解 private String upload2(@RequestParam("file")MultipartFile partFile,HttpServletRequest request) { try { //上传文件的地址：这里是tomcat下的expressproject工程下的image目录 String path = request.getServletContext().getRealPath("/image"); //获取文件的原始名 String filename = partFile.getOriginalFilename(); //上传文件的地址 File file = new File(path+"/"+filename); InputStream inputStream = partFile.getInputStream(); //将上传的文件流写入到地址里面 FileUtils.copyInputStreamToFile(inputStream, file); if(inputStream!=null){ inputStream.close(); } return "文件上传成功！"; } catch (Exception e) { e.printStackTrace(); return "文件上传失败！"; } }
或者
@RequestMapping(value="/upload",method=RequestMethod.POST) @ResponseBody public String upload(MultipartFile file,HttpServletRequest request) throws IOException{ String path = request.getSession().getServletContext().getRealPath("upload"); String fileName = file.getOriginalFilename(); File dir = new File(path,fileName);//这里可以修改成新的文件名：String newName = UUID.randomUUID().toString().replaceAll("-", ""); if(!dir.exists()){ dir.mkdirs(); } //dir可修改文件名 file.transferTo(dir); return fileName; }
下载文件的controller：
@RequestMapping("/down")
private void down1(HttpServletRequest request,HttpServletResponse response) throws IOException {
//下载文件的地址
String path = request.getServletContext().getRealPath("/image");
File file = new File(path);
File[] files = file.listFiles();
//取第一个文件名
String name = files[0].getName();
//防止文件名中文乱码
name = URLEncoder.encode(name,"UTF-8");
response.addHeader("content-disposition", "attachment;filename="+name);
//下载第一个文件
FileUtils.copyFile(files[0], response.getOutputStream());
}
前台代码index.jsp：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <form action="http://localhost:8080/expressproject/upload" method="post" enctype="multipart/form-data"> 选择文件: <input type="file" name="file" width="120px"> <input type="submit" value="上传"> </form> <hr> <form action="http://localhost:8080/expressproject/down" method="get"> <input type="submit" value="下载"> </form> </body> </html>