文章目录

---

一、文件上传三要素

<form action="${pageContext.request.contextPath}/user/quick21" method="post" enctype="multipart/form-data">
    名称<input type="text" name="username"><br>
    文件<input type="file" name="upload"><br>
    <input type="submit" value="提交">
</form>
1
2
3
4
5

二、文件上传原理

三、单文件上传步骤

1.导入fileload和io坐标

<dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.2.2</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.11.0</version>
    </dependency>
1
2
3
4
5
6
7
8
9
10

2.配置文件上传解析器

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

1
2
3
4
5
6

3.编写文件上传代码

    @RequestMapping(value = "/quick21")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public void save21(String username, MultipartFile upload) throws IOException {
        System.out.println(username);
        /*System.out.println(upload);*/
        //获得上传文件名称
        String originalFilename = upload.getOriginalFilename();
        upload.transferTo(new File("F:\\upload\\"+originalFilename));
    }
1
2
3
4
5
6
7
8
9

四、多文件上传

1.方式一

<form action="${pageContext.request.contextPath}/user/quick22" method="post" enctype="multipart/form-data">
    名称<input type="text" name="username"><br>
    文件<input type="file" name="upload"><br>
    文件<input type="file" name="upload1"><br>
    <input type="submit" value="提交">
</form>
1
2
3
4
5
6

@RequestMapping(value = "/quick22")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public void save22(String username, MultipartFile upload,MultipartFile upload1) throws IOException {
        System.out.println(username);
        /*System.out.println(upload);*/
        //获得上传文件名称
        String originalFilename = upload.getOriginalFilename();
        upload.transferTo(new File("F:\\upload\\"+originalFilename));
        String originalFilename1 = upload1.getOriginalFilename();
        upload.transferTo(new File("F:\\upload\\"+originalFilename1));
    }
1
2
3
4
5
6
7
8
9
10
11

2.方式二(数组)

<form action="${pageContext.request.contextPath}/user/quick23" method="post" enctype="multipart/form-data">
    名称<input type="text" name="username"><br>
    文件<input type="file" name="upload"><br>
    文件<input type="file" name="upload"><br>
    <input type="submit" value="提交">
</form>
1
2
3
4
5
6

 @RequestMapping(value = "/quick23")
    @ResponseBody  //告诉SpringMVC框架不进行视图跳转，直接进行数据响应
    public void save23(String username, MultipartFile[] upload) throws IOException {
        System.out.println(username);
        /*System.out.println(upload);*/
        //获得上传文件名称
        for (MultipartFile multipartFile : upload) {
            String originalFilename = multipartFile.getOriginalFilename();
            multipartFile.transferTo(new File("F:\\upload\\"+originalFilename));

        }
    }
1
2
3
4
5
6
7
8
9
10
11
12

五、知识要点