上传文件和下载
多文件上传
第一步：架包
第二步
package cn.happy.controller; import java.io.File; import java.io.IOException; import javax.servlet.http.HttpSession; 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.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; @Controller public class FirstController { @RequestMapping("/second.do") public String doFirst(@RequestParam MultipartFile[] upload,HttpSession session){ String dirctory = session.getServletContext().getRealPath("/upload"); for (MultipartFile item : upload) { //2.文件名称 String filename = item.getOriginalFilename(); //加判定，拦截 if (filename.endsWith(".jpg")||filename.endsWith(".png")) { //3.做保存 File file=new File(dirctory,filename); try { item.transferTo(file); } catch (Exception e) { e.printStackTrace(); } } } return "/success.jsp"; } @RequestMapping("/first.do") /** * * @param upload 从客户端浏览上传过来的文件对象 * @return */ public String doFirst(MultipartFile upload,HttpSession session){ //save到server上的一个具体的文件夹中。 if (upload.getSize()>0) { //1.物理文件夹 String dirctory = session.getServletContext().getRealPath("/upload"); //2.文件名称 String filename = upload.getOriginalFilename(); //加判定，拦截 if (filename.endsWith(".jpg")||filename.endsWith(".png")) { //3.做保存 File file=new File(dirctory,filename); try { upload.transferTo(file); } catch (Exception e) { e.printStackTrace(); } } return "/welcome.jsp"; } else { return "/index.jsp"; } } }
第三步：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: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/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 配置包扫描器--> <context:component-scan base-package="cn.happy.controller"></context:component-scan> <!-- 文件上传解析器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="utf-8"></property> <property name="maxUploadSize" value="500000000"></property> </bean> <!-- 需要配置注解驱动 --> <mvc:annotation-driven/> </beans>
第四步：web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></display-name> <!-- 编码过滤器 --> <filter> <filter-name>CharacterEncoding</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> </filter> <filter-mapping> <filter-name>CharacterEncoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 配置中央调度器 --> <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> <!-- TOmcat启动的时候，Servlet对象就存储到内存 正整数 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
第五步：多文件上传jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title></title> <script type="text/javascript" src="js/jquery-1.8.3.js"></script> </head> <body> <h1>多文件上传</h1> <form action="${pageContext.request.contextPath }/second.do" method="post" enctype="multipart/form-data"> 文件1 <input type="file" name="upload"/> 文件2 <input type="file" name="upload"/> <input type="submit"/> </form> </body> </html>
文件下载
package cn.happy.controller; import java.io.File; import java.io.IOException; import org.apache.commons.io.FileUtils; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class DownFile { @RequestMapping(value="/download.do") public ResponseEntity<byte[]> download() throws IOException { File file=new File("D:\\hehe.jpg"); HttpHeaders headers = new HttpHeaders(); String fileName=new String("你好.jpg".getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题 headers.setContentDispositionFormData("attachment", fileName); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED); } }
jsp
<a href="${pageContext.request.contextPath }/download.do?hehe.png">下载</a>
