文件上传
结构图
导入依赖
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
</dependency>
web.xml配置
<?xml version="1.0" encoding="UTF-8" ?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>Archetype Created Web Application</display-name>
<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:spring.xml</param-value>
</init-param>
<!--启动顺序-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encodingFilter</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>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
上传一个或多个文件
index.jsp代码
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form method="post" action="file" enctype="multipart/form-data">
上传文件：<input type="file" name="picture">
<input type="submit" value="提交">
</form>
<hr>
<h1>多文件</h1>
<form method="post" action="files" enctype="multipart/form-data">
上传文件1：<input type="file" name="pictures">
上传文件2：<input type="file" name="pictures">
上传文件3：<input type="file" name="pictures">
<input type="submit" value="提交">
</form>
</body>
</html>
WEB-INF下的success.jsp代码
spring.xml
<?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">
<context:component-scan base-package="com.tmg"></context:component-scan>
<!-- 视图解析器-->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 静态资源处理器-->
<mvc:default-servlet-handler></mvc:default-servlet-handler>
<!-- 注解驱动-->
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 文件上传处理器-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"></property>
<property name="maxUploadSize" value="10485760"></property>
</bean>
</beans>
FileController代码
运行的时候，浏览器页面要在WEB-INF下的index.jsp，跑完该项目时，页面是webapp下的index.jsp,所以跑完之后切换请求路径（/toFile）进入WEB-INF下的index.jsp
package com.tmg.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
@Controller
public class FileController {
private static final String DIR = "D:\\picture\\";
@RequestMapping("/toFile")
public String text() {
return "/index";
}
@RequestMapping("file")
public String text1(MultipartFile picture) throws IOException {
String filename = picture.getOriginalFilename();
picture.transferTo(new File(DIR, filename));
return "success";
}
@RequestMapping("/files")
public String text2(MultipartFile[] pictures) {
try {
for (MultipartFile picture : pictures) {
String filename = picture.getOriginalFilename();
if("".equals(filename)){
continue;
}
picture.transferTo(new File(DIR, filename));
System.out.println(filename);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
return "success";
}
}
}
文件下载
DownloadController代码
跑的时候记得在路径带上 file=XXX ，并在执行前指定自己下载目录
package com.tmg.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
/**
* 下载控制器
*/
@Controller
public class DownloadController {
@RequestMapping("/download")
public void download(String file, HttpServletResponse response) throws IOException {
//下载文件的路径
String path = "D:\\picture\\";
File downFile = new File(path+file);
if(downFile.exists()){
//设置浏览器下载内容类型，响应头
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition","attachment;filename="+file);
//通过流发送文件
Files.copy(downFile.toPath(),response.getOutputStream());
}
}
}
