6.SpringMVC的文件上传

6.1-SpringMVC的请求-文件上传-客户端表单实现(应用)

文件上传客户端表单需要满足：

• 表单项type=“file”

• 表单的提交方式是post

• 表单的enctype属性是多部分表单形式，及enctype=“multipart/form-data”

<form action="${pageContext.request.contextPath}/user/login22" method="post" enctype="multipart/form-data">
        名称<input type="text" name="username"><br/>
        文件1<input type="file" name="uploadFile"><br/>
        <input type="submit" value="提交">
    </form>

6.2-SpringMVC的请求-文件上传-文件上传的原理(理解)

6.3-SpringMVC的请求-文件上传-单文件上传的代码实现1(应用)

添加依赖

<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>2.3</version>
    </dependency>

配置多媒体解析器

<!--配置文件上传解析器-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UYF-8"/>
        <property name="maxUploadSize" value="500000"/>
    </bean>

后台程序

@RequestMapping(value="/login22")
    @ResponseBody
    public void login22(String username, MultipartFile uploadFile) throws IOException {
        System.out.println(username);
       	System.out.println(uploadFile);
    }

6.4-SpringMVC的请求-文件上传-单文件上传的代码实现2(应用)

完成文件上传

@RequestMapping(value="/quick22")
    @ResponseBody
    public void login22(String username, MultipartFile uploadFile) throws IOException {
        System.out.println(username);
        //获得上传文件的名称
        String originalFilename = uploadFile.getOriginalFilename();
        uploadFile.transferTo(new File("D:\\upload\\"+originalFilename));
    }

6.5-SpringMVC的请求-文件上传-多文件上传的代码实现(应用)

多文件上传，只需要将页面修改为多个文件上传项，将方法参数MultipartFile类型修改为MultipartFile[]即可

<form action="${pageContext.request.contextPath}/user/quick23" method="post" enctype="multipart/form-data">
        名称<input type="text" name="username"><br/>
        文件1<input type="file" name="uploadFile"><br/>
        文件2<input type="file" name="uploadFile"><br/>
        <input type="submit" value="提交">
    </form>

@RequestMapping(value="/login23")
    @ResponseBody
    public void save23(String username, MultipartFile[] uploadFile) throws IOException {
        System.out.println(username);
          /*
        //MultipartFile  uploadFile, MultipartFile uploadFile2
        String filename1 = uploadFile.getOriginalFilename();
        uploadFile.transferTo(new File("D:\\uploadFile\\" + filename1));
        String filename2 = uploadFile2.getOriginalFilename();
        uploadFile2.transferTo(new File("D:\\uploadFile\\" + filename2));
        */
        for (MultipartFile multipartFile : uploadFile) {
            String originalFilename = multipartFile.getOriginalFilename();
            multipartFile.transferTo(new File("D:\\upload\\"+originalFilename));
        }
    }

6.6-SpringMVC的请求-知识要点(理解，记忆)

在进行文件上传时需要前台的file的名称与后台的名称一致，才能进行文件上床。