標籤：介紹 pat list log 適配 dispatch ase 註解 nload
我們經常會使用的一個功能是檔案下載，既然有檔案下載就會有檔案上傳，下面我們來看一下檔案上傳是如何?的
首先準備好一個頁面
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>檔案上傳</h1> 檔案：<input type="file" name="uploadFile"/><br/> 檔案：<input type="file" name="uploadFile"/><br/> 檔案：<input type="file" name="uploadFile"/><br/> <input type="submit" value="上傳"> </form> </body>
單檔案上傳
通過對檔案的大小來判斷是否有檔案
通過檔案的類型來判斷是否是允許
@Controllerpublic class MyController {@RequestMapping(value="/frist.do", method=RequestMethod.POST)public String doFirst(HttpSession session,MultipartFile uploadFile)throws Exception{if(uploadFile.getSize()>0){//02.擷取前半部分路徑，jiangWebRoot下一個名稱為images檔案夾 轉換成絕對路徑String path = session.getServletContext().getRealPath("/upload");//01.擷取檔案名稱作為儲存到伺服器的檔案名稱String fileName=uploadFile.getOriginalFilename();if(fileName.endsWith(".jpg")||fileName.endsWith(".JPG")){//03.路徑拼接File file = new File(path,fileName);uploadFile.transferTo(file);}return "welcome.jsp";}return "error.jsp";}
applicationContext.xml配置
<?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 "><!-- 配置包掃描器 --><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><!-- 用戶端發送資料的編碼 --><property name="maxUploadSize" value="5242880"></property><!-- 上傳檔案的大小 --><!-- <property name="uploadTempDir" value="/upload"></property> --></bean><!-- mvc註解驅動 --><mvc:annotation-driven /></beans>
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> <!-- ================spring mvc 適配器================ --> <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>
多檔案上傳(多檔案上傳與單檔案上傳配置相同下面介紹一下不同的地方)
標記為紅色的欄位為多檔案上傳 與單檔案上傳的區別
@RequestMapping(value="/firstdown.do")public String doFirst(@RequestParam MultipartFile[] uploadFile,HttpSession session)throws Exception{for (MultipartFile item : uploadFile) {if(item.getSize()>0){//02.擷取前半部分路徑，jiangWebRoot下一個名稱為images檔案夾 轉換成絕對路徑String path = session.getServletContext().getRealPath("/upload");//01.擷取檔案名稱作為儲存到伺服器的檔案名稱String fileName=item.getOriginalFilename();if(fileName.endsWith(".jpg")||fileName.endsWith(".JPG")){//03.路徑拼接File file = new File(path,fileName);item.transferTo(file);}return "welcome.jsp";}}return "error.jsp";}
檔案下載
@RequestMapping(value="/first.do")
public static void download(HttpServletRequest request, HttpServletResponse response, String storeName, String contentType ) throws Exception { request.setCharacterEncoding("UTF-8"); BufferedInputStream bis = null; BufferedOutputStream bos = null; //擷取項目根目錄 String ctxPath = request.getSession().getServletContext() .getRealPath(""); //擷取下載檔案露肩 String downLoadPath = ctxPath+"/uploadFile/"+ storeName; //擷取檔案的長度 long fileLength = new File(downLoadPath).length(); //設定檔案輸出類型 response.setContentType("application/octet-stream"); response.setHeader("Content-disposition", "attachment; filename=" + new String(storeName.getBytes("utf-8"), "ISO8859-1")); //設定輸出長度 response.setHeader("Content-Length", String.valueOf(fileLength)); //擷取輸入資料流 bis = new BufferedInputStream(new FileInputStream(downLoadPath)); //輸出資料流 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); } //關閉流 bis.close(); bos.close(); }
下載直接存取控制器如：http:\\localhost:8080/springmvc/download.do
或者通過JSP頁面
<a href="./downloadFile/download" >下載</a>
檔案上傳(StringMVC)
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