文件上传(StringMVC)
文件上传(StringMVC)
我们经常会使用的一个功能是文件下载,既然有文件下载就会有文件上传,下面我们来看一下文件上传是如何实现的
首先准备好一个页面
jsp
<style type="text/css"> form{ margin:0px auto; border:1px solid red; width:500px; padding:20px; } </style> </head> <body> <form action="${pageContext.request.contextPath }/frist.do" method="post" enctype="multipart/form-data"> <h1>文件上传</h1> 文件:<input type="file" name="uploadFile"/><br/> 文件:<input type="file" name="uploadFile"/><br/> 文件:<input type="file" name="uploadFile"/><br/> <input type="submit" value="上传"> </form> </body>
applicationContext.xml配置
web.xml
多文件上传(多文件上传与单文件上传配置相同下面介绍一下不同的地方)
标记为红色的字段为多文件上传 与单文件上传的区别
文件上传(StringMVC)
我们经常会使用的一个功能是文件下载,既然有文件下载就会有文件上传,下面我们来看一下文件上传是如何实现的
首先准备好一个页面
jsp
<style type="text/css"> form{ margin:0px auto; border:1px solid red; width:500px; padding:20px; } </style> </head> <body> <form action="${pageContext.request.contextPath }/frist.do" method="post" enctype="multipart/form-data"> <h1>文件上传</h1> 文件:<input type="file" name="uploadFile"/><br/> 文件:<input type="file" name="uploadFile"/><br/> 文件:<input type="file" name="uploadFile"/><br/> <input type="submit" value="上传"> </form> </body>
单文件上传
通过对文件的大小来判断是否有文件
通过文件的类型来判断是否是允许
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@Controller public class MyController { @RequestMapping (value= "/frist.do" , method=RequestMethod.POST) public String doFirst(HttpSession session,MultipartFile uploadFile) throws Exception{ if (uploadFile.getSize()> 0 ){ //02.获取前半部分路径,jiangWebRoot下一个名称为images文件夹 转换成绝对路径 String path = session.getServletContext().getRealPath( "/upload" ); //01.获取文件名作为保存到服务器的文件名称 String fileName=uploadFile.getOriginalFilename(); if (fileName.endsWith( ".jpg" )||fileName.endsWith( ".JPG" )){ //03.路径拼接 File file = new File(path,fileName); uploadFile.transferTo(file); } return "welcome.jsp" ; } return "error.jsp" ; } |
applicationContext.xml配置
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<?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.controller" ></context:component-scan> <bean id= "multipartResolver" class = "org.springframework.web.multipart.commons.CommonsMultipartResolver" > <property name= "defaultEncoding" value= "utf-8" ></property><!-- 客户端发送数据的编码 --> <property name= "maxUploadSize" value= "5242880" ></property><!-- 上传文件的大小 --> <!-- <property name= "uploadTempDir" value= "/upload" ></property> --> </bean> <!-- mvc注解驱动 --> <mvc:annotation-driven /> </beans> |
web.xml
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<?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> <!-- ================spring mvc 适配器================ --> <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> <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> |
多文件上传(多文件上传与单文件上传配置相同下面介绍一下不同的地方)
标记为红色的字段为多文件上传 与单文件上传的区别
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@RequestMapping (value= "/firstdown.do" ) public String doFirst( @RequestParam MultipartFile[] uploadFile,HttpSession session) throws Exception{ for (MultipartFile item : uploadFile) { if (item.getSize()> 0 ){ //02.获取前半部分路径,jiangWebRoot下一个名称为images文件夹 转换成绝对路径 String path = session.getServletContext().getRealPath( "/upload" ); //01.获取文件名作为保存到服务器的文件名称 String fileName=item.getOriginalFilename(); if (fileName.endsWith( ".jpg" )||fileName.endsWith( ".JPG" )){ //03.路径拼接 File file = new File(path,fileName); item.transferTo(file); } return "welcome.jsp" ; } } return "error.jsp" ; } |
文件下载
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@RequestMapping (value= "/first.do" ) |
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<br> public static void download(HttpServletRequest request, HttpServletResponse response, String storeName, String contentType ) throws Exception { request.setCharacterEncoding( "UTF-8" ); BufferedInputStream bis = null ; BufferedOutputStream bos = null ; //获取项目根目录 String ctxPath = request.getSession().getServletContext() .getRealPath( "" ); //获取下载文件露肩 String downLoadPath = ctxPath+ "/uploadFile/" + storeName; //获取文件的长度 long fileLength = new File(downLoadPath).length(); //设置文件输出类型 response.setContentType( "application/octet-stream" ); response.setHeader( "Content-disposition" , "attachment; filename=" + new String(storeName.getBytes( "utf-8" ), "ISO8859-1" )); //设置输出长度 response.setHeader( "Content-Length" , String.valueOf(fileLength)); //获取输入流 bis = new BufferedInputStream( new FileInputStream(downLoadPath)); //输出流 bos = new BufferedOutputStream(response.getOutputStream()); byte [] buff = new byte [ 2048 ]; int bytesRead; while (- 1 != (bytesRead = bis.read(buff, 0 , buff.length))) { bos.write(buff, 0 , bytesRead); } //关闭流 bis.close(); bos.close(); } |
下载直接访问控制器如:http:\\localhost:8080/springmvc/download.do
或者通过JSP页面
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<a href= "./downloadFile/download" >下载</a> |