SpringMVC笔记（3）---文件的上传方式

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：

1. 表单项：type = “file”
2. 表单的提交方式是post
3. 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/quick" 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>

2.文件上传-单文件上传代码实现

1. 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>

2. 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>

3. 后台程序

   @RequestMapping(value="/quick")
    @ResponseBody
    public void save22(String username, MultipartFile uploadFile) throws IOException {
        System.out.println(username);
           System.out.println(uploadFile);
    }

   4.多文件上传代码实现

   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[]

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