SpringMVC单文件上传、多文件上传、文件列表显示、文件下载

林炳文Evankaka原创作品。转自https://blog.csdn.net/Evankaka/article/details/45826697

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

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！

本文工程免费下载

林炳文Evankaka原创作品。转自https://blog.csdn.net/Evankaka/article/details/45826697

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

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>