创建Web项目，导入相关JAR包；
<dependency>
<groupId>commons
-fileupload</groupId>
<artifactId>commons
-fileupload</artifactId>
<vers
ion>1.4</vers
ion>
</dependency>
<!
-- https
://mvnrepository.com/artifact/commons
-io/commons
-io -->
<dependency>
<groupId>commons
-io</groupId>
<artifactId>commons
-io</artifactId>
<vers
ion>2.11.0</vers
ion>
</dependency>
创建并配置web.xml文件；
<?xml vers
ion="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
:schemaLocat
ion="http
://xmlns.jcp.org/xml/ns/javaee http
://xmlns.jcp.org/xml/ns/javaee/web
-app_4_0.xsd"
vers
ion="4.0">
<servlet>
<servlet
-name>Springmvc</servlet
-name>
<servlet
-class>org.springframework.web.servlet.DispatcherServlet</servlet
-class>
<init
-param>
<param
-name>contextConfigLocat
ion</param
-name>
<param
-value>classpath
:SpringMVC.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>
添加用于上传的jsp页面；
<%@ page language="java" contentType="text/html; charset=UTF
-8" pageEncoding="UTF
-8"%>
<%@ taglib uri="http
://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<title>文件上传</title>
</head>
<body>
<table border="1">
<tr>
<td width="500" align="center">文件上传</td>
</tr>
<tr>
<td>
<form act
ion="${pageContext.request.contextPath}/file/upload"
method="post" enctype="multipart/form
-data">
<input type="file" name="uploadfiles" multiple="multiple"/><br>
<input type="submit" value="上传"><br>
</form>
</td>
</tr>
<c
:forEach items="${msgs}" var="msg">
<tr><td align="center" colspan="2" style="color
: red">${msg}</td></tr>
</c
:forEach>
</table>
</body>
</html>
创建控制类用于上传文件；
package com.springmvc.controller;
import java.
io.File;
import java.
io.
IOExcept
ion;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotat
ion.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
@Controller
@RequestMapping("/file")
public class FileUploadController {
@RequestMapping("/upload")
public
String fileUpload(ArrayList<MultipartFile> uploadfiles, HttpServletRequest request) {
//定义列表msgs保存提示信息
ArrayList<
String> msgs = new ArrayList<>();
if (uploadfiles.get(0).getSize() > 0) { //判断是否上传文件
for (MultipartFile file
: uploadfiles) { //循环获取文件
//判断文件不为空且大小大于0
if (!file.isEmpty() & file.getSize() > 0) {
//获取文件原始名称
String originalFilename = file.getOriginalFilename();
//获取服务器中的文件夹路径
String path = request.getServletContext().getRealPath("/upload/");
//设置文件保存到服务器的目标路径
String filePath = path + originalFilename;
try {
//保存文件内容到目标路径
file.transferTo(new File(filePath));
} catch (
IOExcept
ion e) {
msgs.add(filePath + "保存失败");
}
msgs.add(filePath +"保存成功");
}
}
}
else
msgs.add("上传文件失败");
request.setAttribute("msgs", msgs);
return "fileUpload";
}
}
添加配置文件；
<?xml vers
ion="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
:schemaLocat
ion="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">
<context
:component
-scan base
-package="com.springmvc.controller"/>
<mvc
:annotat
ion
-driven />
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB
-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!
--配置视图控制器，指定文件上传页面的映射路径
-->
<mvc
:view
-controller path="/file/fileupload" view
-name="fileUpload"/>
<mvc
:view
-controller path="/file/filedownload" view
-name="fileDownload"/>
<!
--配置注解驱动
-->
<mvc
:annotat
ion
-driven/>
<!
--配置文件上传解析器
-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!
--指定请求的编码方式
-->
<property name="defaultEncoding" value="UTF
-8"></property>
<!
--指定允许上传文件的大小，此处设置最大值为1 M，单位为字节
-->
<property name="maxUploadSize" value="1024000"></property>
</bean>
</beans>
添加上传成功的消息页面。
文件下载：
创建控制器类：
package com.springmvc.controller;
import java.
io.File;
import java.
io.
IOExcept
ion;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.
io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotat
ion.RequestMapping;
@Controller
@RequestMapping("/file")
public class FileDownloadController {
@RequestMapping("/download")
public ResponseEntity<byte[]> FileDownload(HttpServletRequest request,
String fileName)
throws
IOExcept
ion {
//获取下载文件的路径
String filepath = request.getServletContext().getRealPath("/upload/") + fileName;
//创建该文件的对象
File file = new File(filepath);
//将文件读取到字节数组中
byte[] bytes = FileUtils.readFileToByteArray(file);
//创建HttpHeaders对象设置响应头信息
HttpHeaders headers = new HttpHeaders();
//设置浏览器以“UTF
-8”编码方式显示文件名
fileName = URLEncoder.encode(fileName, "UTF
-8");
//设置以下载的方式打开文件，并指定文件名称
headers.setContentDisposit
ionFormData("attachment", fileName);
//设置文件的下载方式为二进制流
headers.setContentType(MediaType.APPLICAT
ION_OCTET_STREAM);
return new ResponseEntity<>(bytes, headers, HttpStatus.OK);
}
}
添加用于上传的jsp页面；
<%@ page language="java" contentType="text/html; charset=UTF
-8" pageEncoding="UTF
-8"%>
<!DOCTYPE html>
<html>
<head>
<title>文件下载</title>
</head>
<body>
<table border="1">
<tr>
<td width="350" align="center">下载列表</td>
</tr>
<tr>
<td>
<a href="${pageContext.request.contextPath}/file/download?fileName=微信图片_20250612231528.jpg">
这是一张图片</a><br>
</td>
</tr>
</table>
</body>
</html>
实验成果：
修改一下
博主长时间未更新 Blog，计划未来分享更多技术笔记。当前专注于 Haskell 的学习，邀请对此有兴趣的朋友共同交流进步。
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