林炳文Evankaka原創作品。轉載請註明出處http://blog.csdn.net/evankaka
本文詳細講解了SpringMVC實例單文件上傳、多文件上傳、文件列表顯示、文件下載。
一、新建一個Web工程,導入相關的包
springmvc的包+commons-fileupload.jar+connom-io.jar+commons-logging,jar+jstl.jar+standard.jar
整個相關的包如下:
整個工程目錄如下:
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>
<!-- 設置自己定義的控制器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配置文件結束 -->
<!-- 攔截設置 -->
<servlet-mapping>
<servlet-name>MyDispatcher</servlet-name>
<!-- 由SpringMVC攔截所有請求 -->
<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">
<!-- 把標記了@Controller註解的類轉換爲bean -->
<context:component-scan base-package="com.mucfc" />
<!-- 對模型視圖名稱的解析,即在模型視圖名稱添加前後綴 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/views/" p:suffix=".jsp"/>
<!-- 上傳文件的設置 ,maxUploadSize=-1,表示無窮大。uploadTempDir爲上傳的臨時目錄 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
p:defaultEncoding="UTF-8"
p:maxUploadSize="5400000"
p:uploadTempDir="fileUpload/temp"
/>
</beans>
三、單個文件上傳
(1)控制器
@Controller
@RequestMapping("/file")
public class FileController {
@RequestMapping("/toFile")
public String toFileUpload() {
return "fileUpload";
}
@RequestMapping("/toFile2")
public String toFileUpload2() {
return "fileUpload2";
}
/**
* 方法一上傳文件
*/
@RequestMapping("/onefile")
public String oneFileUpload(
@RequestParam("file") CommonsMultipartFile file,
HttpServletRequest request, ModelMap model) {
// 獲得原始文件名
String fileName = file.getOriginalFilename();
System.out.println("原始文件名:" + fileName);
// 新文件名
String newFileName = UUID.randomUUID() + fileName;
// 獲得項目的路徑
ServletContext sc = request.getSession().getServletContext();
// 上傳位置
String path = sc.getRealPath("/img") + "/"; // 設定文件保存的目錄
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("上傳圖片到:" + path + newFileName);
// 保存文件地址,用於JSP頁面回顯
model.addAttribute("fileUrl", path + newFileName);
return "fileUpload";
}
/**
* 方法二上傳文件,一次一張
*/
@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,這個頁面是用來上傳又用來顯示上傳後的圖片的頁面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>用戶上傳圖片頁面</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 傳" />
</form>
<h5>上傳結果:</h5>
<img alt="暫無圖片" src="${fileUrl}" />
</center>
</body>
</html>
現在運行後來看看效果,輸入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile
控制檯輸出結果,選擇圖片後
原始文件名:Chrysanthemum.jpg
上傳圖片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/4eafc28c-4baa-4018-ac06-c4a5aec88d6cChrysanthemum.jpg
圖片已被上傳,可以在JSP中顯示出來
來看看服務器的路徑:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img
表明圖片已經上傳到服務器
方法二:
使用文件流的方式來上傳
/**
* 方法二上傳文件,一次一張
*/
@RequestMapping("/onefile2")
public String oneFileUpload2(HttpServletRequest request,
HttpServletResponse response) throws Exception {
CommonsMultipartResolver cmr = new CommonsMultipartResolver(
request.getServletContext());
if (cmr.isMultipart(request)) {
MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request);
Iterator<String> files = mRequest.getFileNames();
while (files.hasNext()) {
MultipartFile mFile = mRequest.getFile(files.next());
if (mFile != null) {
String fileName = UUID.randomUUID()
+ mFile.getOriginalFilename();
String path = "d:/upload/" + fileName;
File localFile = new File(path);
mFile.transferTo(localFile);
request.setAttribute("fileUrl", path);
}
}
}
return "fileUpload";
}
把
<center>
<form action="file/onefile"
method="post" enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="上 傳" />
</form>
<h5>上傳結果:</h5>
<img alt="暫無圖片" src="${fileUrl}" />
</center>
中的<form action="file/onefile"
改成
<form action="file/onefile2"
輸入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile方法二指定上傳到了本地E盤的upload文件夾
頁面結果
四、多文件上傳
(1)控制器
@RequestMapping("/toFile2")
public String toFileUpload2() {
return "fileUpload2";
}
/**
* 一次上傳多張圖片
*/
@RequestMapping("/threeFile")
public String threeFileUpload(
@RequestParam("file") CommonsMultipartFile files[],
HttpServletRequest request, ModelMap model) {
List<String> list = new ArrayList<String>();
// 獲得項目的路徑
ServletContext sc = request.getSession().getServletContext();
// 上傳位置
String path = sc.getRealPath("/img") + "/"; // 設定文件保存的目錄
File f = new File(path);
if (!f.exists())
f.mkdirs();
for (int i = 0; i < files.length; i++) {
// 獲得原始文件名
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("上傳圖片到:" + path + newFileName);
list.add(path + newFileName);
}
// 保存文件地址,用於JSP頁面回顯
model.addAttribute("fileList", list);
return "fileUpload2";
}
其實就是在單文件上傳的方法一中來修改的,只不過弄成了個循環(2)JSP顯示頁面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>用戶上傳圖片頁面</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 傳" />
</form>
<h5>上傳結果:</h5>
<c:forEach items="${fileList}" var="imagename">
<img alt="暫無圖片" src="${imagename}" /> <br/>
</c:forEach>
</center>
</body>
</html>
注意這裏用了</c:forEach>
表單,需要jstl.jar+standard.jar
(3)運行後輸入:http://localhost:8080/SpringMVCLearningChapter4_1/file/toFile2(注意上面是單文件沒有後面的數字2)
選擇圖片,然後點上傳
控制檯輸出結果:
圖片不清看文字 吧:
原始文件名:Desert.jpg
上傳圖片到: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
上傳圖片到: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
上傳圖片到:E:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\SpringMVCLearningChapter4_1\img/dee340d8-9cc0-41ae-9959-f7fa47ff172bJellyfish.jpg
三張圖片都可以顯示出來了
來看看服務器,這就是剛剛上傳的三張
五、上傳文件列表顯示
(1)控制器
/**
* 列出所有的圖片
*/
@RequestMapping("/listFile")
public String listFile(HttpServletRequest request,
HttpServletResponse response) {
// 獲取上傳文件的目錄
ServletContext sc = request.getSession().getServletContext();
// 上傳位置
String uploadFilePath = sc.getRealPath("/img") + "/"; // 設定文件保存的目錄
// 存儲要下載的文件名
Map<String, String> fileNameMap = new HashMap<String, String>();
// 遞歸遍歷filepath目錄下的所有文件和目錄,將文件的文件名存儲到map集合中
listfile(new File(uploadFilePath), fileNameMap);// File既可以代表一個文件也可以代表一個目錄
// 將Map集合發送到listfile.jsp頁面進行顯示
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>下載文件顯示頁面</title>
</head>
<body>
<!-- 遍歷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}">下載</a>
<br/>
</c:forEach>
</body>
</html>
(3)運行後輸入:http://localhost:8080/SpringMVCLearningChapter4_1/file/listFile
這些爲剛剛上傳到四張圖片。
六、文件下載
(1)控制器
@RequestMapping("/downFile")
public void downFile(HttpServletRequest request,
HttpServletResponse response) {
System.out.println("1");
// 得到要下載的文件名
String fileName = request.getParameter("filename");
System.out.println("2");
try {
fileName = new String(fileName.getBytes("iso8859-1"), "UTF-8");
System.out.println("3");
// 獲取上傳文件的目錄
ServletContext sc = request.getSession().getServletContext();
System.out.println("4");
// 上傳位置
String fileSaveRootPath = sc.getRealPath("/img");
System.out.println(fileSaveRootPath + "\\" + fileName);
// 得到要下載的文件
File file = new File(fileSaveRootPath + "\\" + fileName);
// 如果文件不存在
if (!file.exists()) {
request.setAttribute("message", "您要下載的資源已被刪除!!");
System.out.println("您要下載的資源已被刪除!!");
return;
}
// 處理文件名
String realname = fileName.substring(fileName.indexOf("_") + 1);
// 設置響應頭,控制瀏覽器下載該文件
response.setHeader("content-disposition", "attachment;filename="
+ URLEncoder.encode(realname, "UTF-8"));
// 讀取要下載的文件,保存到文件輸入流
FileInputStream in = new FileInputStream(fileSaveRootPath + "\\" + fileName);
// 創建輸出流
OutputStream out = response.getOutputStream();
// 創建緩衝區
byte buffer[] = new byte[1024];
int len = 0;
// 循環將輸入流中的內容讀取到緩衝區當中
while ((len = in.read(buffer)) > 0) {
// 輸出緩衝區的內容到瀏覽器,實現文件下載
out.write(buffer, 0, len);
}
// 關閉文件輸入流
in.close();
// 關閉輸出流
out.close();
} catch (Exception e) {
}
}
這裏就是通過文件流的方式來下載圖片的。
然後就可以自己選擇下載的地方了。
終於講完了,花了大半天啊!
林炳文Evankaka原創作品。轉載請註明出處http://blog.csdn.net/evankaka