文件上传功能

SpingMVC实现上传功能也是相当的简单，但是要做如下几件事情

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

    <!--必须通过文件解析器的解析才能将文件转换为MultipartFile对象-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

页面：

    <form th:action="@{/upload}" method="post" enctype="multipart/form-data">
        头像：<input type="file" name="photo"><br>
        <input type="submit" value="上传">
    </form>

代码

    @PostMapping("upload")
    public String upload(MultipartFile photo,HttpSession httpSession) throws IOException {
        ServletContext servletContext = httpSession.getServletContext();
        String realPath = servletContext.getRealPath("upload.jpg");
        Files.copy(photo.getInputStream(),Paths.get(realPath));
        return "success";
    }

需要注意，在IDEA中上传的位置在：