<form action="first.do" method="post"
        enctype="multipart/form-data">
        <input type="file" name="uploadFile" value="http://www.mamicode.com/选择文件" /> <input type="submit"
            value="提交" />
    </form>

@Controller
public class MyController {

    // 处理器方法
    @RequestMapping(value = "http://www.mamicode.com/first.do")
    public String doFirst(HttpSession session, MultipartFile uploadFile)
            throws Exception {

        // 1.获取文件名称
        String originalFilename = uploadFile.getOriginalFilename();
        // 6.必须选择上传文件
        if (uploadFile.getSize() > 0) {
            // 5.限制文件类型
            if (originalFilename.endsWith("jpg")
                    || originalFilename.endsWith("png")
                    || originalFilename.endsWith("txt")) {
                // 2.获取保存的前路径
                String servletContext = session.getServletContext()
                        .getRealPath("upload");
                System.out.println(servletContext);
                // 3.拼接路径
                File realPath = new File(servletContext, originalFilename);
                // 4.保存
                uploadFile.transferTo(realPath);
                return "/two.jsp";
            }
        }
        return "/error.jsp";
    }
}

<?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:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.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
        ">
    <!-- 扫描包中注解标注的类 -->
    <context:component-scan base-package="cn.cnsdhzzl.controller" />

    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设置编码 -->
        <property name="defaultEncoding" value="http://www.mamicode.com/UTF-8" />
        <!-- 设置上传文件总大小 -->
        <property name="maxUploadSize" value="http://www.mamicode.com/5000" />
        <!-- 设置单个上传文件大小 -->
        <property name="maxUploadSizePerFile" value="http://www.mamicode.com/1000" />
    </bean>

    <mvc:annotation-driven />

</beans>