文件上传在开发中是用得非常多的，担是也挺简单的，我这里简单介绍一下；
首先是前端也面，无论是HTML还是jsp，上传文件的控件是一个form表单，method=”post”；必须加上enctype="multipart/form-data"；
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/uploadFile" method="POST" enctype="multipart/form-data">
<p>单文件上传：</><br/>
<input type="file" name="file1"/>
<input type="submit" value = "上传"/>
</form>
<form method="POST" enctype="multipart/form-data"
action="${pageContext.request.contextPath }/uploadFiles">
<p>多文件上传：</>
<p>文件1：<input type="file" name="file" /></p>
<p>文件2：<input type="file" name="file" /></p>
<p><input type="submit" value="上传" /></p>
</form>
<a href="${pageContext.request.contextPath }/download">下载</a>
</body>
</html>以下是control部分的代码，简单不多做解释：
@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
public void uploadFile(HttpServletRequest req,
MultipartHttpServletRequest multiReq) {
// 获取上传文件的路径
String uploadFilePath = multiReq.getFile("file1").getOriginalFilename();
logger.info("uploadFlePath:" + uploadFilePath);
// 截取上传文件的文件名
String uploadFileName = uploadFilePath.substring(uploadFilePath.lastIndexOf('\\') + 1,
uploadFilePath.indexOf('.'));
logger.info("multiReq.getFile()" + uploadFileName);
// 截取上传文件的后缀
String uploadFileSuffix = uploadFilePath.substring(uploadFilePath.indexOf('.') + 1,
uploadFilePath.length());
logger.info("uploadFileSuffix:" + uploadFileSuffix);
FileOutputStream fos = null;
FileInputStream fis = null;
try {
fis = (FileInputStream)multiReq.getFile("file1").getInputStream();
fos = new FileOutputStream(new File("D:" + File.separator
+ "picture" + File.separator + uploadFileName + "."
+ uploadFileSuffix));
byte[] temp = new byte[1024];
int i = fis.read(temp);
while (i != -1) {
fos.write(temp, 0, temp.length);
fos.flush();
i = fis.read(temp);
}
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (fis != null) {
try {
fis.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
@RequestMapping(value = "uploadFiles", method = RequestMethod.POST)
@ResponseBody
public void uploadFiles(HttpServletRequest request) {
List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("file");
MultipartFile file = null;
BufferedOutputStream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
if (!file.isEmpty()) {
try {
String uploadFilePath = file.getOriginalFilename();
System.out.println("uploadFlePath:" + uploadFilePath);
// 截取上传文件的文件名
String uploadFileName = uploadFilePath.substring(uploadFilePath.lastIndexOf('\\') + 1,
uploadFilePath.indexOf('.'));
System.out.println("multiReq.getFile()" + uploadFileName);
// 截取上传文件的后缀
String uploadFileSuffix = uploadFilePath.substring(uploadFilePath.indexOf('.') + 1,
uploadFilePath.length());
System.out.println("uploadFileSuffix:" + uploadFileSuffix);
stream = new BufferedOutputStream(new FileOutputStream(
new File("D:" + File.separator + "picture"
+ File.separator + uploadFileName + "."
+ uploadFileSuffix)));
byte[] bytes = file.getBytes();
stream.write(bytes, 0, bytes.length);
}
catch (Exception e) {
e.printStackTrace();
}
finally {
try {
if (stream != null) {
stream.close();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
}
else {
System.out.println("上传文件为空");
}
}
System.out.println("文件接受成功了");
}
@RequestMapping(value = "/download", method = RequestMethod.GET)
public void download(HttpServletResponse res) {
String fileName = "info.log";
res.setHeader("content-type", "application/octet-stream");
res.setContentType("application/octet-stream");
res.setHeader("Content-Disposition", "attachment;filename=" + fileName);
byte[] buff = new byte[1024];
BufferedInputStream bis = null;
OutputStream os = null;
try {
os = res.getOutputStream();
bis = new BufferedInputStream(new FileInputStream(new File("D:"
+ File.separator + "picture" + File.separator + fileName)));
int i = bis.read(buff);
while (i != -1) {
os.write(buff, 0, buff.length);
os.flush();
i = bis.read(buff);
}
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (bis != null) {
try {
bis.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("success");
}
