使用SpringMVC框架实现文件上传和下载功能
使用SpringMVC框架实现文件上传和下载功能
(一)单个文件上传
①配置文件上传解释器
<!—配置文件上传解释器 --> <mvc:annotation-driven></mvc:annotation-driven> <bean name="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8"></property> <property name="maxInMemorySize" value="512000000" ></property> <property name="maxUploadSize" value="20000000"></property> </bean>
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②在Controller层编写映射方法
@RequestMapping(value="upload") public String upload(MultipartFile file) throws Exception{ File destfile = new File("D:/dir/" + file.getOriginalFilename()); file.transferTo(destfile); return "/upload.jsp"; }
注意:spring MVC文件上传功能引用了commons-fileupload组件,实现文件上传功能需要引入commons-fileupload和commons-io包
(前端页面很简单,就是一个用来上传文件的input标签,但要注意标签的name属性要和映射方法的参数名对应,如“file”)
(二)多文件上传
@RequestMapping(value="upload") public String upload(MultipartFile[] file) throws Exception{ for (MultipartFile file : files) { File destfile = new File("D:/dir/" + file.getOriginalFilename()); file.transferTo(destfile); } return "/upload.jsp"; }
(三)文件下载
@RequestMapping(value="/{filename}/download")
public void download(@PathVariable String filename,HttpServletResponse response) throws Exception{
File file=new File("d:/dir/"+filename);
FileInputStream input = new FileInputStream(file);
ServletOutputStream out = response.getOutputStream();
response.addHeader("Content-Disposition", "attachment;filename="+new String(filename.getBytes(),"ISO-8859-1"));
IOUtils.cope(input,out);
}
(注:文件下载需要修改应答头信息,将流以附件形式输出,并设置文件名的编码格式为ISO-8859-1)
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