Springmvc中的文件上传

1.环境搭建:

  在maven的pom.xml文件中导入两个依赖

   1).commons-fileupload

   2).commons-io

   在resources目录下的springmvc.xml文件中配置multipartResolver

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="
       http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--包扫描-->
   <context:component-scan base-package="cn.itcast"></context:component-scan>
    <!--配置multipartResolver,注意:id名称固定为multipartResolver-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    </bean>

    <mvc:annotation-driven ></mvc:annotation-driven>
    
    <!--让静态资源不经过过滤器-->
    <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>

    <!--视图解析器给controller中返回的逻辑视图名加上前缀和后缀-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

 

2.编写前台测试jsp

 

<form action="/test/file" method="post" enctype="multipart/form-data">
       上传的文件:<input type="file" name="upload"><br/>
       密钥:<input type="text" name="password"><br/>
       <input type="submit" value="提交">
   </form>

 注意页面三要素:

      1).表单提交方式必须为post

      2).表单中必须有file域,即type="file"

      3).表单中enctype="multipart/form-data"

3.编写后台测试代码

 

@Controller
@RequestMapping("/test")
public class FileUploadController {
    @RequestMapping("/file")
    public String testFileUpload(HttpServletRequest request, MultipartFile upload) throws IOException { //upload是表单中文件name属性值,必须保持一致
        System.out.println("testFileUpload...");
        String realPath = request.getSession().getServletContext().getRealPath("/uploads");
        File file = new File(realPath);
        if(!file.exists()){
            file.mkdirs();//创建文件夹
        }
        String filename = upload.getOriginalFilename(); //获取文件名
        String name = upload.getName();//获取表单中的name属性值 即upload

        String uuid = UUID.randomUUID().toString().replaceAll("-", "");//生成uuid避免文件名重复导致冲突覆盖
        filename=uuid+"_"+filename;
        upload.transferTo(new File(file,filename));
        return "forward:success.jsp";
    }