SpringMVC实现文件上传下载的全过程

前言

文件的上传和下载都是基于io复制,只不过

文件上传是浏览器向服务器发送报文

文件下载是服务器向浏览器发送报文

提示：以下是本篇文章正文内容，下面案例可供参考

一、通用配置

pom.xml

    <dependencies>        <!-- springmvc -->        <dependency>            <groupid>org.spr纯粹的近义词ingframework</groupid>            <artifactid>spring-webmvc</artifactid>            <version>5.3.13</version>        </dependency>        <!-- 日志 -->        <dependency>            <groupid>ch.qos.logback</groupid>            <artifactid>logback-classic</artifactid>            <version>1.2.3</version>        </dependency>        <!-- rvletapi -->        <dependency>            <groupid>javax.rvlet</groupid>            <artifactid>javax.rvlet-api</artifactid>            <version>4.0.1</version>            <scope>provided</scope>        </dependency>        <!-- spring5和thymeleaf整合包 -->        <dependency>            <groupid>org.thymeleaf</groupid>            <artifactid>thymeleaf-spring5</artifactid>            <version>3.0.12.relea</version>        </dependency>        <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->        <dependency>            <groupid>commons-fileupload</groupid>            <artifactid>commons-fileupload</artifactid>            <version>1.3.1</version>        </dependency><!--        springmvc end-->        <!-- 节约用水图片   导入spring坐标-->        <dependency>            <groupid>org.springframework</groupid>            <artifactid>spring-context</artifactid>            <version>5.3.11</version>        </dependency><!--        导入测试坐标-->        <dependency>            <groupid>junit</groupid>            <artifactid>junit</artifactid>            <version>4.12</version>            <scope>test</scope>        </dependency>        <!--    测试坐标--><!--        导入集成测试坐标-->        <dependency>            <groupid>org.springframework</groupid>            <artifactid>spring-test</artifactid>            <version>5.3.13</version>        </dependency>        <!--        集成测试坐标end-->        <!--        导入mysql坐标-->        <dependency>            <groupid>mysql</groupid>            <artifactid>mysql-connector-java</artifactid>            <version>8.0.24</version>        </dependency>        <!--        mysql坐标end-->        <!--        导入druid连接池-->        <dependency>            <groupid>com.alibaba</groupid>            <artifactid>druid</artifactid>            <version>1.2.8</version>        </dependency>        <!--        导入druid连接池end-->        <!--        导入spring上下文-->        <dependency>            <groupid>org.springframework</groupid>            <artifactid>spring-context</artifactid>            <version>5.3.11</version>        </dependency>        <!--        导入spring上下文end--><!--        导入spring web开发api start-->        <dependency>            <groupid>javax.rvlet</groupid>            <artifactid>javax.rvlet-api</artifactid>            <version>4.0.1</version>            <scope>provided</scope>        </dependency>        <dependency>            <groupid>javax.rvlet.jsp</groupid>            <artifactid>javax.rvlet.jsp-api</artifactid>            <version>2.3.3</version>        </dependency>        <!--        导入spring web开发end--><!--        导入jackson的依赖-->        <dependency>            <groupid>com.fasterxml.jackson.core</groupid>            <artifactid>jackson-databind</artifactid>            <version>2.12.1</version>        </dependency>        <!--上传功能的关键jar -->        <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->        <dependency>            <groupid>commons-fileupload</groupid>            <artifactid>commons-fileupload</artifactid>            <version>1.3.1</version>        </dependency>    </dependencies>

上传功能的关键jar

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-爱情阶梯 电影instance"         xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"         version="4.0">    <!--配置springmvc的编码过滤器-->    <!--    springmvc中处理编码的过滤器一定要配置到其他过滤器之前，否则无效-->    <!-- 字符集过滤器 -->    <filter>        <description>字符集过滤器</description>        <filter-name>characterencodingfilter</filter-name>        <filter-class>org.springframework.web.filter.characterencodingfilter</filter-class>        <init-param>            <description>字符集编码</description>            <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>    <!-- 字符集拦截 -->    <filter-mapping>        <filter-name>characterencodingfilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <filter>        <filter-name>hiddenhttpmethodfilter</filter-name>        <filter-class>org.springframework.web.filter.hiddenhttpmethodfilter</filter-class>    </filter>    <filter-mapping>        <filter-name>hiddenhttpmethodfilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <!--    注册前端控制器dispatcherrvlet-->    <rvlet>        <rvlet-name>dispatcherrvlet</rvlet-name>        <rvlet-class>org.springframework.web.rvlet.dispatcherrvlet</rvlet-class>        <init-param>            <param-name>contextconfiglocation</param-name>            <param-value>classpath:springmvc.xml</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </rvlet>    <rvlet-mapping>        <rvlet-name>dispatcherrvlet</rvlet-name>        <url-pattern>/</url-pattern>    </rvlet-mapping></web-app>

springmvc.xml

<?xml version="1.0" encoding="utf-8"?><beans xmlns="/d/file/titlepic/"       xmlns:xsi="/d/file/titlepic/xmlschema-instance"       xmlns:context="/d/file/titlepic/"       xmlns:mvc="/d/file/titlepic/"       xsi:schemalocation="http://www.springframework.org/schema/beans /d/file/titlepic/spring-beans.xsd http://www.springframework.org/schema/context /d/file/titlepic/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">    <!--    扫描组件-->    <context:component-scan ba-package="com.vector"/>    <!-- 配置thymeleaf视图解析器 -->    <bean id="viewresolver" class="org.thymeleaf.spring5.view.thymeleafviewresolver">        <property name="order" value="1"/>        <property name="characterencoding" value="utf-8"/>        <property name="templateengine">            <bean class="org.thymeleaf.spring5.springtemplateengine">                <property name="templateresolver">                    <bean class="org.thymeleaf.spring5.templateresolver.springresourcetemplateresolver">                        <!-- 视图前缀 -->                        <property name="prefix" value="/web-inf/templates/"/>                        <!-- 视图后缀 -->                        <property name="suffix" value=".html"/>                        <property name="templatemode" value="html5"/>                        <property name="characterencoding" value="utf-8" />                    </bean>                </property>            </bean>        </property>    </bean>    <!-- 处理响应中文内容乱码 -->    <bean class="org.springframework.http.converter.stringhttpmessageconverter">        <property name="defaultchart" value="utf-8" />        <property name="supportedmediatypes">            <list>                <value>text/html&新乡学校lt;/value>                <value>application/json</value>            </list>        </property>    </bean>    <mvc:view-controller path="/" view-name="index"/>    <mvc:view-controller path="/file" view-name="file"/>    <mvc:default-rvlet-handler/>    <mvc:annotation-driven/>    <!--必须通过文件解析器的解析才能将文件转换为multipartfile对象-->    <bean id="multipartresolver" class="org.springframework.web.multipart.commons.commonsmultipartresolver"></bean></beans>

实现页面跳转,vue文件解析,上传内容解析的关键

file.html内容demo

<body><a th:href="@{/testdown}" rel="external nofollow" >下载1.jpg</a><form th:action="@{/testup}" method="post" enctype="multipart/form-data">    头像: <input type="file" name="photo"><br>    <input type="submit" value="上传"></form></body>

二、实现文件下载,上传功能

package com.vector.controller;import org.springframework.beans.factory.annotation.value;import org.springframework.http.httpheaders;import org.springframework.http.httpstatus;import org.springframework.http.responentity;import org.springframework.stereotype.controller;import org.springframework.util.multivaluemap;import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.multipart.multipartfile;import javax.annotation.resource;import javax.rvlet.rvletcontext;import javax.rvlet.http.httpssion;import java.io.file;import java.io.fileinputstream;import java.io.ioexception;import java.io.inputstream;import java.util.uuid;@controllerpublic class fileupanddowncontroller {    @requestmapping("/testdown")    public responentity<byte[]> testresponentity(httpssion ssion) throws ioexception {        //获取rvletcontext对象        rvletcontext rvletcontext = ssion.getrvletcontext();        //获取服务器中文件的真实路径        string realpath = rvletcontext.getrealpath("/static/img/1.jpg");        //创建输入流        inputstream is = new fileinputstream(realpath);        //创建字节数组        byte[] bytes = new byte[is.available()];        //将流读到字节数组中        is.read(bytes);        //创建httpheaders对象设置响应头信息        multivaluemap<string, string> headers = new httpheaders();        //设置要下载方式以及下载文件的名字        //content-disposition 固定回复内容格式  attachment以附件形式下载  filename=1.jpg文件名        //可以将filename拼接为动态命名        headers.add("content-disposition", "attachment;filename=1.jpg");        //设置响应状态码        httpstatus statuscode = httpstatus.ok;        //创建responentity对象        responentity<byte[]> responentity = new responentity<>(bytes, headers, statuscode);        //关闭输入流        is.clo();        return responentity;    }    @requestmapping("/testup")    public string testup(@value("multipartresolver") multipartfile photo,httpssion ssion) throws ioexception {        //获取上传的文件的文件名        string filename = photo.getoriginalfilename();       初一数学下册练习题 //处理文件重名问题        //重名问题是java.io中写入同一文件默认覆盖原文件内容导致图片被覆盖.        //获取文件名后缀        string suffixname = filename.substring(filename.lastindexof("."));        //将uuid作为文件名  uuid是32位随机数,几乎不可能会重复        filename = uuid.randomuuid().tostring() + suffixname;        //获取服务器中photo目录的路径        rvletcontext rvletcontext = ssion.getrvletcontext();        string photopath = rvletcontext.getrealpath("photo");        file file = new file(photopath);        //判断服务器是否存在该路径        if(!file.exists()){            file.mkdir();        }        string finalpath = photopath + file.parator + filename;        //实现上传功能        photo.transferto(new file(finalpath));        return "success";    }}

下载功能测试

上传功能测试

总结

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