SpringMvc 文件上传

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<!--文件上传的jar包-->    <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>1.4</version>>    </dependency>

@Controllerpublic class Text {    @RequestMapping("/first")    public String t(MultipartFile upload, HttpSession session){          //获取用户上传的文件名称        String filename = upload.getOriginalFilename();//文件名称        //将相对路径换成绝对路径        String realPath = session.getServletContext().getRealPath("/upload");        //将 file 写入指定的路径        File file=new File(realPath,filename);        try {            upload.transferTo(file);            return "/welcon.jsp";        } catch (IOException e) {            e.printStackTrace();        }        return  "/upload.jsp";    }}

<?xml version="1.0" encoding="UTF-8"?><beans  xmlns="http://www.springframework.org/schema/beans"        xmlns:aop="http://www.springframework.org/schema/aop"        xmlns:tx="http://www.springframework.org/schema/tx"        xmlns:context="http://www.springframework.org/schema/context"        xmlns:p="http://www.springframework.org/schema/p"        xmlns:mvc="http://www.springframework.org/schema/mvc"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/aop        http://www.springframework.org/schema/aop/spring-aop.xsd        http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx.xsd        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">    <!--配置 包 扫描器-->    <context:component-scan base-package="cn.hello.Upload"/>    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>   <mvc:annotation-driven/></beans>

<h1>文件上传</h1><form action="/first" method="post" enctype="multipart/form-data">    文件   <input type="file" name="upload"/>    <input type="submit"/></form>

<body>   欢迎你</body>

在 idea 开发工具写文件上传时先加一个文件夹里面必须有东西来保证一起编译

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