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SSM框架-SpringMVC 实例文件上传下载

2017-10-24 11:11 651 查看
原文: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

[html] view
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<?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

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<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

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@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

[html] view
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<%@ 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

[java] view
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/**

* 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";

}



[html] view
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<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

[html] view
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<form action="file/onefile"

改成

[html] view
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<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

[html] view
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@RequestMapping("/toFile2")

public String toFileUpload2() {

return "fileUpload2";

}

[java] view
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/**

* 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

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<%@ 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

[html] view
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</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

[java] view
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/**

* 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

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<%@ 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

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@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。

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