SpringMVC单文件上传、多文件上传、文件列表显示、文件下载

女爷i 2021-09-10 12:52 404阅读 0赞

[林炳文Evankaka][Evankaka]原创作品。转载请注明出处[http://blog.csdn.net/evankaka][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。

[本文工程免费下载][Link 1]

# 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：

![20150518201851323][]

整个工程目录如下：

![20150518202129854][]

# 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">
    	
    	<servlet>
    		<servlet-name>MyDispatcher</servlet-name>
    		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    		
    		<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>
    	
    
    	
    	<servlet-mapping>
    		<servlet-name>MyDispatcher</servlet-name>
    		
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
    	
    </web-app>

(2)springMVC-servlet.xml文件

# 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

![20150518202617893][]

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

![20150518202810288][]

来看看服务器的路径：E:\\workspace\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0\\wtpwebapps\\SpringMVCLearningChapter4\_1\\img

![20150518202824858][]

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

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

![20150518203432523][]

页面结果

![20150518203604201][]

# 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）

![20150518204036753][]

选择图片，然后点上传

![20150518205956974][]

控制台输出结果：

![20150518204242879][]

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**

![20150518204538688][]

来看看服务器，这就是刚刚上传的三张

![20150518204522686][]

# 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>
          
        <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。

![20150518205845303][]

# 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。

![20150518205259564][]

终于讲完了，花了大半天啊！

[本文工程免费下载][Link 1]

[林炳文Evankaka][Evankaka]原创作品。转载请注明出处[http://blog.csdn.net/evankaka][http_blog.csdn.net_evankaka]

更多技术请关注笔者微信技术公众号"单例模式"

![70][]

[Evankaka]: http://my.csdn.net/Evankaka
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