參考：
http://blog.csdn.net/u012706811/article/details/51059419
http://blog.csdn.net/u012660464/article/details/53434331
一、文件上傳
1.引入依賴包
在pom.xml文件中添加如下內容，引入 commons-fileupload 和 commons-io 兩個包。
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.3</version>
</dependency>2.spring-mvc.xml
<!--文件上傳-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--最大上傳大小(字節)-->
<property name="maxUploadSize" value="1048576" />
</bean>3.fileUpload.jsp
form中加入 enctype=”multipart/form-data” 屬性，表示將文件一二進制流傳輸，否則報錯。
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>fileUpload —— 單個文件</title>
</head>
<body>
<h1 align = "center">文件上傳</h1>
<form action = "${website}FileController" enctype="multipart/form-data" method = "post">
選擇文件:<input type="file" name = "file">
<input type="submit" value = "提交">
</form>
</body>
</html>4.Success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>success</title>
</head>
<body>
<h1 align="center">Success!</h1>
</body>
</html>
5.index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2 align="center">Hello World!</h2>
<a href="${website}admin/listUser">進入用戶管理界面</a>
<a href="${website}file/fileUpload">上傳單個文件</a>
<a href="${website}file/multiFileUpload">上傳多個文件</a>
<%--<a href="${website}file/fileDownload">下載文件</a>--%>
<a href="${website}file/download">下載指定文件</a>
</body>
</html>
6.FileController
/**
* 去文件上傳頁面
*
* @return
*/
@RequestMapping(value = "fileUpload", method = RequestMethod.GET)
public String toFileUpload(){
return "/file/fileUpload";
}
/**
* 單個文件上傳
*
* @param file
* @return
*/
@RequestMapping(value = "upload", method = RequestMethod.POST)
public String fileUpload(@RequestParam("file")MultipartFile file){
if (!file.isEmpty()){
try {
//存入F:\temp目錄下
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("F:\\temp",
System.currentTimeMillis()+ file.getOriginalFilename()));
} catch (IOException e){
e.printStackTrace();
}
}
//上傳成功，跳轉至success頁面
return "file/success";
}
7.多個文件上傳
/**
* 去多個文件上傳頁面
*
* @return
*/
@RequestMapping(value = "multiFileUpload", method = RequestMethod.GET)
public String toMultiFileUpload(){
return "/file/multiFileUpload";
}
/**
* 多個文件上傳
*
* @param multiRequest
* @return
*/
@RequestMapping(value = "multiUpload", method = RequestMethod.POST)
public String multiFileUpload(MultipartHttpServletRequest multiRequest) throws IOException {
Iterator<String> filesNames = multiRequest.getFileNames(); //獲得所有的文件名
while(filesNames.hasNext()){ //迭代，對單個文件進行操作
String fileName =filesNames.next();
MultipartFile file = multiRequest.getFile(fileName);
if(!file.isEmpty()){
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("F:\\temp",
System.currentTimeMillis()+ file.getOriginalFilename()));
}
}
//上傳成功，跳轉至success頁面
return "file/success";
}
二、文件下載
1.index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2 align="center">Hello World!</h2>
<a href="${website}admin/listUser">進入用戶管理界面</a>
<a href="${website}file/fileUpload">上傳文件</a>
<%--<a href="${website}file/fileDownload">下載文件</a>--%>
<a href="${website}file/download">下載指定文件</a>
</body>
</html>
2.FileController
現在實現的功能是點擊“下載指定文件”則下載在controller中指定好的文件，還沒有實現把上傳的文件傳入數據庫，也沒實現下載數據庫中要存的文件，日後慢慢改進。
/**
* 指定文件下載
*
* @return
* @throws IOException
*/
@RequestMapping(value = "download",produces = "application/octet-stream;charset=UTF-8")
public ResponseEntity<byte[]> download() throws IOException {
// 指定文件,必須是絕對路徑
File file = new File("F:\\temp\\1513489657107psb.jpg");
// 下載瀏覽器響應的那個文件名
String dfileName = "1.jpg";
// 下面開始設置HttpHeaders,使得瀏覽器響應下載
HttpHeaders headers = new HttpHeaders();
// 設置響應方式
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
// 設置響應文件
headers.setContentDispositionFormData("attachment", dfileName);
// 把文件以二進制形式寫回
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);
}效果
