文件下载与上传
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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@Controllerpublic 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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1
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@RequestMapping(value="/first.do") |
<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(); } |
