分享知识-快乐自己：SpringMvc中的单多文件上传及文件下载
摘要：SpringMvc中的单多文件上传及文件下载：（以下是核心代码（拿过去直接能用）不谢）
<!--设置文件上传需要的jar-->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
ControllerWelcome 控制器类：
package controller; import bean.User; import org.apache.commons.io.FileUtils; import org.apache.commons.lang3.RandomUtils; 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.validation.BindingResult; import org.springframework.validation.annotation.Validated; 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.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpSession; import java.io.File; import java.io.IOException; import java.lang.reflect.Field; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; /** * @author asus */ @Controller @RequestMapping("/user") public class ControllerWelcome { //单文件上传（User对象的属性名与表单中的name名一致方可自动映射到值） @RequestMapping("/upload") public ModelAndView upload(User user, MultipartFile picPath, HttpSession session) { ModelAndView modelAndView = new ModelAndView("Welcome"); //获取服务器路径 String realPath = session.getServletContext().getRealPath("/upload/"); //判断是否存在，不存在则创建 File file = new File(realPath); if (!file.exists()) { file.mkdir(); } //获取源文件名称 String originalFilename = picPath.getOriginalFilename(); String fileName = System.currentTimeMillis() + RandomUtils.nextInt(0, 1000000) + originalFilename; File file1 = new File(realPath, fileName); try { picPath.transferTo(file1); System.out.println("用户名为：" + user.getUseName()); System.out.println("上传成功:" + realPath); } catch (IOException e) { e.printStackTrace(); } return modelAndView; } //多文件上传（User对象中的属性名与表单的name名一致方可自动映射到值） @RequestMapping("/uploads") public ModelAndView uploads(User user, @RequestParam MultipartFile[] picPath, HttpSession session) { ModelAndView modelAndView = new ModelAndView("Welcome"); //获取服务器路径 String realPath = session.getServletContext().getRealPath("/upload/"); //判断是否存在，不存在则创建 File file = new File(realPath); if (!file.exists()) { file.mkdir(); } for (MultipartFile temp : picPath) { //获取源文件名称 String originalFilename = temp.getOriginalFilename(); String fileName = System.currentTimeMillis() + RandomUtils.nextInt(0, 1000000) + originalFilename; File file1 = new File(realPath, fileName); try { temp.transferTo(file1); System.out.println("用户名为：" + user.getUseName()); System.out.println("上传成功:" + realPath); } catch (IOException e) { e.printStackTrace(); } } return modelAndView; } //文件下载 @RequestMapping(value = "/download", method = RequestMethod.GET) //匹配的是href中的download请求 public ResponseEntity<byte[]> download(@RequestParam("filename") String filename ) throws IOException { //从我们的上传文件夹中去取 String downloadFilePath = "E:\\idealCase\\CourseNotes\\SpringMvcCase\\SpringMvcCode06\\target\\SpringMvcCode06\\upload"; //新建一个文件 File file = new File(downloadFilePath + File.separator + filename); //http头信息 HttpHeaders headers = new HttpHeaders(); //设置编码 String downloadFileName = new String(filename.getBytes("UTF-8"), "iso-8859-1"); headers.setContentDispositionFormData("attachment", downloadFileName); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); //MediaType:互联网媒介类型 contentType：具体请求中的媒体类型信息 return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED); } }
核心配置文件：Spring-view.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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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 http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--指定Controller扫描器--> <context:component-scan base-package="controller"/> <!--配置试图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--配置文件上传解析器--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8"/> <!--单个文件大小--> <property name="maxUploadSizePerFile" value="100000"/> <!--文件总大小--> <property name="maxUploadSize" value="100000"/> </bean> </beans>
web.xml 配置文件：
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <!--设置乱码--> <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> <!--设置核心控制器--> <servlet> <servlet-name>mvc</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> <!--优先加载--> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>mvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
index.jsp 前端页面：
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<body>
<h2>Hello World!</h2>
<fieldset>
<legend>单文件上传：</legend>
<form action="/user/upload" method="post" enctype="multipart/form-data">
用户名：<input type="text" name="useName"><br/>
文件一：<input type="file" name="picPath">
<input type="submit" value="提交">
</form>
</fieldset>
<br/><br/>
<fieldset>
<legend>多文件上传：</legend>
<form action="/user/uploads" method="post" enctype="multipart/form-data">
用户名：<input type="text" name="useName"><br/>
文件一：<input type="file" name="picPath">
文件一：<input type="file" name="picPath">
<input type="submit" value="提交">
</form>
</fieldset>
<br/><br/>
<fieldset>
<legend>文件下载</legend>
<a href="/user/download?filename=1537854894247新建文本文档.txt">
文件下载：1537854894247新建文本文档.txt</a>
</fieldset>
</body>
</html>
