林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka
本文详细讲解了SpringMVC实例单文件上传、多文件上传、文件列表显示、文件下载。
一、新建一个Web工程,导入相关的包
springmvc的包+commons-fileupload.jar+connom-io.jar+commons-logging,jar+jstl.jar+standard.jar
整个相关的包如下:
整个工程目录如下:
二、配置web.xml和SpringMVC文件
(1)web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <!-- SpringMVC的前端控制器 --> <servlet> <servlet-name>MyDispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 设置自己定义的控制器xml文件 --> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/springMVC-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- Spring MVC配置文件结束 --> <!-- 拦截设置 --> <servlet-mapping> <servlet-name>MyDispatcher</servlet-name> <!-- 由SpringMVC拦截所有请求 --> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
(2)springMVC-servlet.xml文件
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <!-- 把标记了@Controller注解的类转换为bean --> <context:component-scan base-package="com.mucfc" /> <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/views/" p:suffix=".jsp"/> <!-- 上传文件的设置 ,maxUploadSize=-1,表示无穷大。uploadTempDir为上传的临时目录 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="UTF-8" p:maxUploadSize="5400000" p:uploadTempDir="fileUpload/temp" /> </beans>
三、单个文件上传
(1)控制器
@Controller @RequestMapping("/file") public class FileController { @RequestMapping("/toFile") public String toFileUpload() { return "fileUpload"; } @RequestMapping("/toFile2") public String toFileUpload2() { return "fileUpload2"; } /** * 方法一上传文件 */ @RequestMapping("/onefile") public String oneFileUpload( @RequestParam("file") CommonsMultipartFile file, HttpServletRequest request, ModelMap model) { // 获得原始文件名 String fileName = file.getOriginalFilename(); System.out.println("原始文件名:" + fileName); // 新文件名 String newFileName = UUID.randomUUID() + fileName; // 获得项目的路径 ServletContext sc = request.getSession().getServletContext(); // 上传位置 String path = sc.getRealPath("/img") + "/"; // 设定文件保存的目录 File f = new File(path); if (!f.exists()) f.mkdirs(); if (!file.isEmpty()) { try { FileOutputStream fos = new FileOutputStream(path + newFileName); InputStream in = file.getInputStream(); int b = 0; while ((b = in.read()) != -1) { fos.write(b); } fos.close(); in.close(); } catch (Exception e) { e.printStackTrace(); } } System.out.println("上传图片到:" + path + newFileName); // 保存文件地址,用于JSP页面回显 model.addAttribute("fileUrl", path + newFileName); return "fileUpload"; } /** * 方法二上传文件,一次一张 */ @RequestMapping("/onefile2") public String oneFileUpload2(HttpServletRequest request, HttpServletResponse response) throws Exception { CommonsMultipartResolver cmr = new CommonsMultipartResolver( request.getServletContext()); if (cmr.isMultipart(request)) { MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request); Iterator<String> files = mRequest.getFileNames(); while (files.hasNext()) { MultipartFile mFile = mRequest.getFile(files.next()); if (mFile != null) { String fileName = UUID.randomUUID() + mFile.getOriginalFilename(); String path = "d:/upload/" + fileName; File localFile = new File(path); mFile.transferTo(localFile); request.setAttribute("fileUrl", path); } } } return "fileUpload"; } }
(2)JSP,这个页面是用来上传又用来显示上传后的图片的页面fileUpload.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>用户上传图片页面</title> <base href="<%=basePath%>"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <center> <form action="file/onefile" method="post" enctype="multipart/form-data"> <input type="file" name="file" /> <input type="submit" value="上 传" /> </form> <h5>上传结果:</h5> <img alt="暂无图片" src="${fileUrl}" /> </center> </body> </html>
现在运行后来看看效果,输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile
控制台输出结果,选择图片后
原始文件名:Chrysanthemum.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/4eafc28c-4baa-4018-ac06-c4a5aec88d6cChrysanthemum.jpg
图片已被上传,可以在JSP中显示出来
来看看服务器的路径:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img
表明图片已经上传到服务器
方法二:
使用文件流的方式来上传
/** * 方法二上传文件,一次一张 */ @RequestMapping("/onefile2") public String oneFileUpload2(HttpServletRequest request, HttpServletResponse response) throws Exception { CommonsMultipartResolver cmr = new CommonsMultipartResolver( request.getServletContext()); if (cmr.isMultipart(request)) { MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request); Iterator<String> files = mRequest.getFileNames(); while (files.hasNext()) { MultipartFile mFile = mRequest.getFile(files.next()); if (mFile != null) { String fileName = UUID.randomUUID() + mFile.getOriginalFilename(); String path = "d:/upload/" + fileName; File localFile = new File(path); mFile.transferTo(localFile); request.setAttribute("fileUrl", path); } } } return "fileUpload"; }
把
<center> <form action="file/onefile" method="post" enctype="multipart/form-data"> <input type="file" name="file" /> <input type="submit" value="上 传" /> </form> <h5>上传结果:</h5> <img alt="暂无图片" src="${fileUrl}" /> </center>
中的
<form action="file/onefile"
改成
<form action="file/onefile2"
输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile
方法二指定上传到了本地E盘的upload文件夹
页面结果
四、多文件上传
(1)控制器
@RequestMapping("/toFile2") public String toFileUpload2() { return "fileUpload2"; }
/** * 一次上传多张图片 */ @RequestMapping("/threeFile") public String threeFileUpload( @RequestParam("file") CommonsMultipartFile files[], HttpServletRequest request, ModelMap model) { List<String> list = new ArrayList<String>(); // 获得项目的路径 ServletContext sc = request.getSession().getServletContext(); // 上传位置 String path = sc.getRealPath("/img") + "/"; // 设定文件保存的目录 File f = new File(path); if (!f.exists()) f.mkdirs(); for (int i = 0; i < files.length; i++) { // 获得原始文件名 String fileName = files[i].getOriginalFilename(); System.out.println("原始文件名:" + fileName); // 新文件名 String newFileName = UUID.randomUUID() + fileName; if (!files[i].isEmpty()) { try { FileOutputStream fos = new FileOutputStream(path + newFileName); InputStream in = files[i].getInputStream(); int b = 0; while ((b = in.read()) != -1) { fos.write(b); } fos.close(); in.close(); } catch (Exception e) { e.printStackTrace(); } } System.out.println("上传图片到:" + path + newFileName); list.add(path + newFileName); } // 保存文件地址,用于JSP页面回显 model.addAttribute("fileList", list); return "fileUpload2"; }
其实就是在单文件上传的方法一中来修改的,只不过弄成了个循环
(2)JSP显示页面fileUpload2.jsp
<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>用户上传图片页面</title> <base href="<%=basePath%>"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <center> <form action="file/threeFile" method="post" enctype="multipart/form-data"> <input type="file" name="file" /><br /> <input type="file" name="file" /><br /> <input type="file" name="file" /><br /> <input type="submit" value="上 传" /> </form> <h5>上传结果:</h5> <c:forEach items="${fileList}" var="imagename"> <img alt="暂无图片" src="${imagename}" /> <br/> </c:forEach> </center> </body> </html>
注意这里用了
</c:forEach>
表单,需要jstl.jar+standard.jar
(3)运行后输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile2(注意上面是单文件没有后面的数字2)
选择图片,然后点上传
控制台输出结果:
图片不清看文字 吧:
原始文件名:Desert.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/2baccc77-43b6-4908-859d-507e86a04051Desert.jpg
原始文件名:Hydrangeas.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/51ad04e0-82aa-4b2c-958d-f00651e9ed6bHydrangeas.jpg
原始文件名:Jellyfish.jpg
上传图片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/dee340d8-9cc0-41ae-9959-f7fa47ff172bJellyfish.jpg
三张图片都可以显示出来了
来看看服务器,这就是刚刚上传的三张
五、上传文件列表显示
(1)控制器
/** * 列出所有的图片 */ @RequestMapping("/listFile") public String listFile(HttpServletRequest request, HttpServletResponse response) { // 获取上传文件的目录 ServletContext sc = request.getSession().getServletContext(); // 上传位置 String uploadFilePath = sc.getRealPath("/img") + "/"; // 设定文件保存的目录 // 存储要下载的文件名 Map<String, String> fileNameMap = new HashMap<String, String>(); // 递归遍历filepath目录下的所有文件和目录,将文件的文件名存储到map集合中 listfile(new File(uploadFilePath), fileNameMap);// File既可以代表一个文件也可以代表一个目录 // 将Map集合发送到listfile.jsp页面进行显示 request.setAttribute("fileNameMap", fileNameMap); return "listFile"; }
(2)JSP文件listFile.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE HTML> <html> <head> <title>下载文件显示页面</title> </head> <body> <!-- 遍历Map集合 --> <c:forEach var="me" items="${fileNameMap}"> <c:url value="/file/downFile" var="downurl"> <c:param name="filename" value="${me.key}"></c:param> </c:url> ${me.value}<a href="${downurl}">下载</a> <br/> </c:forEach> </body> </html>
(3)运行后输入:http://localhost:8080/SpringMVCLearningChapter4_1/file/listFile
这些为刚刚上传到四张图片。
六、文件下载
(1)控制器
@RequestMapping("/downFile") public void downFile(HttpServletRequest request, HttpServletResponse response) { System.out.println("1"); // 得到要下载的文件名 String fileName = request.getParameter("filename"); System.out.println("2"); try { fileName = new String(fileName.getBytes("iso8859-1"), "UTF-8"); System.out.println("3"); // 获取上传文件的目录 ServletContext sc = request.getSession().getServletContext(); System.out.println("4"); // 上传位置 String fileSaveRootPath = sc.getRealPath("/img"); System.out.println(fileSaveRootPath + "\\" + fileName); // 得到要下载的文件 File file = new File(fileSaveRootPath + "\\" + fileName); // 如果文件不存在 if (!file.exists()) { request.setAttribute("message", "您要下载的资源已被删除!!"); System.out.println("您要下载的资源已被删除!!"); return; } // 处理文件名 String realname = fileName.substring(fileName.indexOf("_") + 1); // 设置响应头,控制浏览器下载该文件 response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8")); // 读取要下载的文件,保存到文件输入流 FileInputStream in = new FileInputStream(fileSaveRootPath + "\\" + fileName); // 创建输出流 OutputStream out = response.getOutputStream(); // 创建缓冲区 byte buffer[] = new byte[1024]; int len = 0; // 循环将输入流中的内容读取到缓冲区当中 while ((len = in.read(buffer)) > 0) { // 输出缓冲区的内容到浏览器,实现文件下载 out.write(buffer, 0, len); } // 关闭文件输入流 in.close(); // 关闭输出流 out.close(); } catch (Exception e) { } }
这里就是通过文件流的方式来下载图片的。
然后就可以自己选择下载的地方了。
终于讲完了,花了大半天啊!
林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka