SpringMvc中文件上传

1.导入文件上传所需要的jar包

<dependency>
  <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

2. 配置文件解析器

<!--文件解析器-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" >
        <property name="maxInMemorySize" value="10485760"/>
    </bean>

3.写一个前端页面

<form action="/user/fileUpload" method="post"
        enctype="multipart/form-data">
    选择文件：<input type="file" name="upload"/><br>
    <input type="submit" value="上传"/>
  </form>

4.写后台程序

@Controller
@RequestMapping("/user")
public class FileUploadController {
    @RequestMapping("/fileUpload")
    public String fileUpload(HttpServletRequest request, MultipartFile upload) throws Exception {
        System.out.println("文件上传");
        //使用fileUpload组件完成文件上传
        //上传的位置
        String realPath = request.getSession().getServletContext().getRealPath("/uploads/");
        System.out.println(realPath);

        //判断该路径是否存在
        File file = new File(realPath);
        if(!file.exists()){
            //创建该文件
            file.mkdirs();
        }

        //获取到上传文件的名称
        String fileName = upload.getOriginalFilename();
        //防止文件上传被覆盖，将文件名设置为唯一的
        String uuid= UUID.randomUUID().toString().replace("-","");
        fileName = uuid+"_"+fileName;
        //完成文件上传
        upload.transferTo(new File(realPath,fileName));

        return "success";
    }
}