springmvc(7) 文件上传

1.通过commons-fileupload来实现：导入jar包commons-fileupload和commons-io

2.配置springmvc：配置解析器：

   <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"/>
        <property name="maxUploadSize" value="10485760000"/>
        <property name="maxInMemorySize" value="40960"/>
    </bean>

3.编写上传处理器代码：

    @RequestMapping("/upload")
    public String fileupload(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
        //获取文件名
//        file.getOriginalFilename();
        String path ="/fileupload";
        InputStream is = file.getInputStream();
        OutputStream os = new FileOutputStream(new File(path,file.getOriginalFilename()));
        int len=0;
        byte[] buffer = new byte[400];
        while ((len = is.read(buffer)) != -1){
            os.write(buffer,0,len);
        }
        os.close();
        is.close();
        return "index.jsp";
    }

4.jsp页面：

  <form action="upload" method="post" enctype="multipart/form-data">
      <input type="file" name="file" value=""/><br/>
      <input type="submit" value="submit">
  </form>