使用spring-webmvc6实现文件上传及下载
- 使用SpringMVC6版本，不需要添加以下依赖：
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.5</version>
</dependency>
- 新建maven模块springmvc-009,pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>SpringMVC</artifactId>
<groupId>com.powernode</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>springmvc-009</artifactId>
<packaging>war</packaging>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>6.1.7</version>
</dependency>
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf-spring6</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>6.1.0</version>
<!--指定servlet-api有tomcat容器提供,打包时将不会将servlet-api包加入打包中-->
<scope>provided</scope>
</dependency>
<!-- <dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>-->
<!-- <dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.5.3</version>
</dependency>-->
</dependencies>
</project>
- 增加web支持,web.xml
<?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">
<!--字符编码过滤器-->
<filter>
<filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--前端控制器-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:dispatcherServlet-servlet.xml</param-value>
</init-param>
<multipart-config>
<!--支持最大文件大小-->
<max-file-size>1024000</max-file-size>
<!--表单中多选的所有文件上传最大值-->
<max-request-size>1024000</max-request-size>
<!--设置最小文件上传大小-->
<file-size-threshold>0</file-size-threshold>
</multipart-config>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
spring配置文件
<?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">
<!--组件扫描-->
<context:component-scan base-package="com.powernode.springmvc.controller"/>
<!--视图控制器-->
<!--视图解析器-->
<bean id="viewResolver" class="org.thymeleaf.spring6.view.ThymeleafViewResolver">
<!--作用于视图渲染过程中,设置视图渲染后输出时采用的编码字符集-->
<property name="characterEncoding" value="utf-8"/>
<!--若存在多个视图解析器,配置优先级,值越小优先级越高-->
<property name="order" value="1"/>
<property name="templateEngine">
<bean class="org.thymeleaf.spring6.SpringTemplateEngine">
<property name="templateResolver">
<bean class="org.thymeleaf.spring6.templateresolver.SpringResourceTemplateResolver">
<!--设置模板文件的位置-->
<property name="prefix" value="/WEB-INF/templates/"/>
<!--设置模板文件后缀-->
<property name="suffix" value=".html"/>
<!--设置模板类型-->
<property name="templateMode" value="HTML"/>
<!--设置模板文件在读取和解析过程中采用的编码字符集-->
<property name="characterEncoding" value="utf-8"/>
</bean>
</property>
</bean>
</property>
</bean>
<!--视图控制器-->
<mvc:view-controller path="/" view-name="index"/>
<!--开启注解驱动-->
<mvc:annotation-driven/>
<!--静态资源处理-->
<mvc:default-servlet-handler/>
</beans>
- 配置前端首页
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>文件上传与下载</title>
</head>
<body>
<h1>文件上传与下载</h1>
<hr>
<form th:action="@{/fileup}" method="post" enctype="multipart/form-data">
文件上传: <input type="file" name="fileName"><br>
<input type="submit" value="上传">
</form>
</body>
</html>
- 配置FileController
package com.powernode.springmvc.controller;
import jakarta.servlet.ServletContext;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
@RestController
public class FileController {
@RequestMapping(value = "/fileup",method = RequestMethod.POST)
public String fileup(@RequestParam("fileName") MultipartFile multipartFile, HttpServletRequest request) throws IOException {
String name = multipartFile.getName();
System.out.println(name);//获取的名字是fineName
String originalFilename = multipartFile.getOriginalFilename();
System.out.println(originalFilename);//获取的名字是文件原名
Path path = Paths.get(name);
System.out.println("path:"+ path);
//获取输入流
InputStream inputStream = multipartFile.getInputStream();
BufferedInputStream bis = new BufferedInputStream(inputStream);
//输出流
ServletContext servletContext = request.getServletContext();
String realPath = servletContext.getRealPath("/upload");
File file = new File(realPath);
if (!file.exists()){
file.mkdirs();
}
File destFile = new File(file.getAbsolutePath() + "/" + UUID.randomUUID().toString() + originalFilename);
//输出流
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destFile));
//一边读一边写
byte[] bytes = new byte[1024 * 10];
int readCount = 0;
while((readCount = bis.read(bytes)) != -1){
bos.write(bytes, 0,readCount);
}
bos.flush();
bos.close();
bis.close();
return "ok";
}
}
最后重启tomcat,测试
成功上传到服务器指定地址:
文件下载
在index.html页面新增
<!--文件下载-->
<a th:href="@{/download/Photoshop.jpg}">文件下载</a>
在FileController类中新增
//文件下载
@GetMapping("/download/{filename}")
public ResponseEntity downloadFile(@PathVariable(value = "filename")String filename, HttpServletRequest request, HttpServletResponse response) throws IOException {
File file = new File(request.getServletContext().getRealPath("/upload/") + filename);
// 创建响应头对象
HttpHeaders headers = new HttpHeaders();
// 设置响应内容类型
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
// 设置下载文件的名称
headers.setContentDispositionFormData("attachment", file.getName());
// System.out.println(file.getName());
// 下载文件,第一种方法一次性读取下载文件,对内存有压力
ResponseEntity entity = new ResponseEntity(Files.readAllBytes(file.toPath()), headers, HttpStatus.OK);
return entity;
//下载文件,第一种方法二种方法,将之前创建的InputStreamResource对象（在这里是resource）设置到响应体中。
/*InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
return ResponseEntity.ok()
.headers(headers)
.body(resource);*/
}
重启tomcat,打开浏览器点击"文件下载"
补充:
.headers(headers): 这将之前创建的HttpHeaders对象（在这里是headers）设置到响应头中。这个headers对象应该包含必要的响应头信息，例如Content-Type（指定文件类型）和Content-Disposition（指定文件名为附件，以便浏览器提示用户下载而不是尝试打开它）。
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