配置
web.xml
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<?xml version="1.0" encoding="utf-8"?><web-app xmlns="https://jakarta.ee/xml/ns/jakartaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd" version="5.0"> <!--注册dispatcherservlet--> <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:applicationcontext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping></web-app> |
springmvc配置文件 applicationcontext.xml
上传文件的核心配置类：commonsmultipartresolver，注意id="multipartresolver"不要写错
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<?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: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/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--配置自动扫描controller包--> <context:component-scan base-package="com.pro.controller"/> <!--配置静态资源过滤--> <mvc:default-servlet-handler/> <!--配置注解驱动--> <mvc:annotation-driven/> <!--配置视图解析器--> <bean id="internalresourceviewresolver" class="org.springframework.web.servlet.view.internalresourceviewresolver"> <!--前缀--> <property name="prefix" value="/web-inf/jsp/"/> <!--后缀--> <property name="suffix" value=".jsp"/> </bean> <!--springmvc文件上传配置--> <bean id="multipartresolver" class="org.springframework.web.multipart.commons.commonsmultipartresolver"> <!--设置请求的编码格式, 必须和pageencoding的属性一致, 以便正确读取表单的值, 默认为iso-8859-1--> <property name="defaultencoding" value="utf-8"/> <!--上传文件的大小限制, 单位为字节 (10485760 = 10m)--> <property name="maxuploadsize" value="10485760"/> <property name="maxinmemorysize" value="40960"/> </bean></beans> |
文件上传 controller
上传实现一
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package com.pro.controller;import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.bind.annotation.requestparam;import org.springframework.web.bind.annotation.restcontroller;import org.springframework.web.multipart.commons.commonsmultipartfile;import javax.servlet.http.httpservletrequest;import javax.servlet.http.httpservletresponse;import java.io.*;import java.net.urlencoder;import java.util.hashmap;import java.util.map;@restcontrollerpublic class filecontroller { /* * 采用file.transferto 来保存上传的文件 */ @requestmapping("/upload2") public map fileupload2(@requestparam("file") commonsmultipartfile file, httpservletrequest request) throws ioexception { //上传路径保存设置 string path = request.getservletcontext().getrealpath("/upload"); file realpath = new file(path); if (!realpath.exists()){ realpath.mkdir(); } //上传文件地址 system.out.println("上传文件保存地址 --> "+realpath); //通过commonsmultipartfile的方法直接写文件（注意这个时候） file.transferto(new file(realpath +"/"+ file.getoriginalfilename())); map<object, object> hashmap = new hashmap<>(); hashmap.put("code", 0); hashmap.put("msg", "上传成功"); return hashmap; }} |
上传实现二
这里的文件名称没有使用 uuid组合名称 为了方便测试
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package com.pro.controller;import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.bind.annotation.requestparam;import org.springframework.web.bind.annotation.restcontroller;import org.springframework.web.multipart.commons.commonsmultipartfile;import javax.servlet.http.httpservletrequest;import javax.servlet.http.httpservletresponse;import java.io.*;import java.net.urlencoder;import java.util.hashmap;import java.util.map;@restcontrollerpublic class filecontroller { // @requestparam("file") 将 name=file 控件得到的文件封装成 commonsmultipartfile 对象 // 批量上传把 commonsmultipartfile 改为数组即可 @requestmapping("/upload") public string upload(@requestparam("file") commonsmultipartfile file, httpservletrequest request) throws ioexception { // 获取文件名称 string uploadfilename = file.getoriginalfilename(); // 如果文件名为空, 直接返回首页 if ("".equals(uploadfilename)) { return "file upload error"; } system.out.println("上传文件名 --> " + uploadfilename); // 设置文件的保存位置 string path = request.getservletcontext().getrealpath("/upload"); // 判断路径是否存在 file realpath = new file(path); if (!realpath.exists()) { // 如果不存在就创建 realpath.mkdir(); } system.out.println("文件保存路径 --> " + realpath); // 获取文件输入流 inputstream is = file.getinputstream(); // 获取文件输出流 fileoutputstream os = new fileoutputstream(new file(realpath, uploadfilename)); // 缓冲区读写文件 byte[] buffer = new byte[1024]; int len; while ((len = is.read(buffer)) != -1) { os.write(buffer, 0, len); os.flush(); } // 关闭流 os.close(); is.close(); return "file upload success"; }} |
测试
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<%@ page contenttype="text/html;charset=utf-8" language="java" %><html> <head> <title>$title$</title> </head> <body> <form enctype="multipart/form-data" action="${pagecontext.request.contextpath}/upload2" method="post"> <input type="file" name="file"> <input type="submit" value="上传实现一"> </form> <form enctype="multipart/form-data" action="${pagecontext.request.contextpath}/upload" method="post"> <input type="file" name="file"> <input type="submit" value="上传实现二"> </form> </body></html> |
依赖
核心依赖就是 commons-fileupload
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<!--导入依赖--><dependencies> <!--单元测试--> <dependency> <groupid>junit</groupid> <artifactid>junit</artifactid> <version>4.13</version> </dependency> <!--spring--> <dependency> <groupid>org.springframework</groupid> <artifactid>spring-webmvc</artifactid> <version>5.2.0.release</version> </dependency> <!--文件上传--> <dependency> <groupid>commons-fileupload</groupid> <artifactid>commons-fileupload</artifactid> <version>1.3.3</version> </dependency> <!--servlet-api导入高版本的--> <dependency> <groupid>javax.servlet</groupid> <artifactid>javax.servlet-api</artifactid> <version>4.0.1</version> </dependency> <!--jsp--> <dependency> <groupid>javax.servlet.jsp</groupid> <artifactid>jsp-api</artifactid> <version>2.2</version> </dependency> <!--jstl表达式--> <dependency> <groupid>javax.servlet</groupid> <artifactid>jstl</artifactid> <version>1.2</version> </dependency></dependencies> |
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