spring mvc文件上传

controller包

package com.bin.springmvc.controller;


        import org.springframework.http.HttpRequest;
        import org.springframework.stereotype.Controller;
        import org.springframework.web.bind.annotation.PostMapping;
        import org.springframework.web.bind.annotation.RequestMapping;
        import org.springframework.web.multipart.MultipartFile;

        import javax.servlet.http.HttpServletRequest;
        import java.io.File;
        import java.io.IOException;
        import java.util.UUID;

@Controller
@RequestMapping("upload")
public class UploadController {
    /**
     * 文件上传
     */
    @PostMapping("/save")
    public  void uploadfila(MultipartFile upload, HttpServletRequest request){
        //拿到原始图片的的名称
        String originalFilename = upload.getOriginalFilename(); //123.png
        //准备上传功能 在服务器上面的某个位置
        String realPath = request.getSession().getServletContext().getRealPath("abc");
        //判断路径是否存在
        File file=new File(realPath);
        if (!file.exists()){
            file.mkdir();
        }
        //拼接路径
        String a=realPath+File.separator+ UUID.randomUUID()+originalFilename;
        System.out.println(a);
        //拷贝
        try {
            upload.transferTo(new File(a));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">


    <context:component-scan base-package="com.bin.springmvc"/>


       <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <mvc:annotation-driven />

    <mvc:default-servlet-handler/>


    <!--配置文件上传解析器,一定要给id，并且名字是 multipartResolver-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize">
            <!--指定文件上传大小，最大为10M-->
            <value>10485760</value>
        </property>
        <!--指定文件上传前端页面编码强制使用utf-8-->
        <property name="defaultEncoding" value="UTF-8"/>
    </bean>
    </beans>

web

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <!--  前端控制器 -->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- spring 提供了一个字符编码过滤器 Filter -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>
      org.springframework.web.filter.CharacterEncodingFilter
    </filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--配置访问首页-->
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>