第十二节——文件上传

Posted 2021-10-24 想学习安全的小白

文件上传测试

1. 新建一个jsp页面：upload.jsp

<form action="${pageContext.request.contextPath}/quick1" 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>

2. 由于表单使用了multipart/form-data，request.getParameter(@RequestParam)将失效
3. 导入坐标

<dependency>
  <groupId>commons-fileupload</groupId>
  <artifactId>commons-fileupload</artifactId>
  <version>1.4</version>
</dependency>
<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.5</version>
</dependency>

4. 在spring-mvc中配置文件上传解析器

<bean id="commonsMultipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="5242800"/> <!--上传文件总大小-->
    <property name="maxUploadSizePerFile" value="5242800"/><!--上传文件单个大小-->
    <property name="defaultEncoding" value="UTF-8"/>
</bean>

5. 编写controller，其中方法的参数名要与页面表单中input标签中的name属性一致

@RequestMapping(value = "/quick1")
    @ResponseBody
    public void show1(String username, MultipartFile upload) throws IOException {
        System.out.println(username);
        String filename = upload.getOriginalFilename();
        upload.transferTo(new File("D:\\\\upload\\\\"+filename));
    }

6. 多文件上传

<form action="${pageContext.request.contextPath}/quick1" method="post" enctype="multipart/form-data">
    名称<input type="text" name="username"><br/>
    文件1<input type="file" name="upload"><br/>
    文件2<input type="file" name="upload"><br/>
    <input type="submit" value="提交">
</form>

@RequestMapping(value = "/quick1")
    @ResponseBody
    public void show1(String username, MultipartFile[] upload) throws IOException {
        System.out.println(username);
        for (MultipartFile f:upload){
            String filename = f.getOriginalFilename();
            f.transferTo(new File("D:\\\\upload\\\\"+filename));
        }
    }