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  • springmvc文件上传的踩坑之路

    学习springmvc文件上传可谓是一波三折。这里我就分享下我的踩坑之路吧

    首先是代码

    <%@ page language="java" contentType="text/html; charset=UTF-8"
             pageEncoding="UTF-8"%>
    <html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>上传文件</title>
    </head>
    <body>
    <form action="/upfile.do" method="post" enctype="multipart/form-data">
        <input type="file" name="file"/>
        <input type="submit" value="上传" />
    </form>
    </body>
    </html>
    

     controller

     @RequestMapping(value = "/upfile",method= RequestMethod.POST)
        public String fileUpload(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
            // 判断文件是否为空
            if (!file.isEmpty()) {
                try {
                    // 文件保存路径
                   String filePath = request.getSession().getServletContext().getRealPath("/") + "update/"
                          + file.getOriginalFilename();
    
                    // 转存文件
                    file.transferTo(new File(filePath));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            // 重定向
            return "success";
        }

    springmvc.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xmlns:p="http://www.springframework.org/schema/p"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xsi:schemaLocation="http://www.springframework.org/schema/beans   
        http://www.springframework.org/schema/beans/spring-beans-3.0.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-3.2.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        ">
        <mvc:annotation-driven></mvc:annotation-driven>
        <context:annotation-config/>
        <context:component-scan base-package="Controller"/>
        <context:component-scan base-package="dao"></context:component-scan>
        <context:component-scan base-package="Service"></context:component-scan>
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/">
            </property>
            <property name="suffix" value=".jsp"></property>
        </bean>
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
                <property name="defaultEncoding" value="utf-8"></property>
            <property name="maxUploadSize" value="104857600000"></property>
            <property name="maxInMemorySize" value="40960"></property>
        </bean>
    </beans>

    web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
             version="3.1">
    
        <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
        <session-config>
            <session-timeout>20</session-timeout>
        </session-config>
        <!--spring 字符过滤器-->
        <filter>
            <filter-name>filterEncoding</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>filterEncoding</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        <listener>
            <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
        </listener>
        <servlet>
            <servlet-name>Dispatcher</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>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>Dispatcher</servlet-name>
         <url-pattern>*.do</url-pattern>
        </servlet-mapping>

    以上是通过的代码。错误的我就不拿出来丢人了。主要是说几点注意

    1.<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">必须设置id。否则会报

    2.表单必须设置method=“post”和enctype=“multipart/form-data”.不然会报

     

    3.接收文件使用multipartFile。

    暂时就先学到这里。以上只是个人的解决方法。如果有什么错了,还望指出

    没有虚过一天,真好
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  • 原文地址:https://www.cnblogs.com/dailinfu/p/6426722.html
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