单文件上传：

pom.xml:

commons-io

commons-io

1.3.2

commons-fileupload

commons-fileupload

1.2.1

jstl

jstl

1.2

taglibs

standard

1.1.2

upload.jsp：

1.input的type设置为file。

2.form表单的method设置为post。(get请求只会将文件名传给后台)

3.form表单的enctype设置为multipart/form-data，以二进制的形式传输数据。

" method="post" enctype="multipart/form-data">

上传的图片

FileController.java:

@RequestMapping(value="upload", method = RequestMethod.POST)

public String upload(@RequestParam(value="img")MultipartFile img, HttpServletRequest request)

throws Exception {

//getSize()方法获取文件的大小来判断是否有上传文件

if (img.getSize() > 0) {

//获取保存上传文件的file文件夹绝对路径

String path = request.getSession().getServletContext().getRealPath("file");

//获取上传文件名

String fileName = img.getOriginalFilename();

File file = new File(path, fileName);

img.transferTo(file);

//保存上传之后的文件路径

request.setAttribute("filePath", "file/"+fileName);

System.out.println("file/"+fileName);

return "upload";

}

return "error";

}

springMVC.xml:

注意：这里需要在webapp文件下手动创建一个file文件夹。

多文件上传：

uploads.jsp:

file1:

file2:

file3:

上传的图片

FileController.java:

@RequestMapping(value="/uploads", method = RequestMethod.POST)

public String uploads(@RequestParam MultipartFile[] imgs, HttpServletRequest request)throws Exception {

//创建集合，保存上传后的文件路径

ListfilePaths = new ArrayList();

for (MultipartFile img : imgs) {

if (img.getSize() > 0) {

String path = request.getSession().getServletContext().getRealPath("file");

String fileName = img.getOriginalFilename();

File file = new File(path, fileName);

filePaths.add("file/"+fileName);

img.transferTo(file);

}

}

request.setAttribute("filePaths", filePaths);

return "uploads";

}

文件下载：

download.jsp:

Insert title here

下载图片

FileController.java:

@RequestMapping("/download")

public void downloadFile(String fileName,HttpServletRequest request,

HttpServletResponse response){

if(fileName!=null){

//获取file绝对路径

String realPath = request.getServletContext().getRealPath("file/");

File file = new File(realPath,fileName);

OutputStream out = null;

if(file.exists()){

//设置下载完毕不打开文件

response.setContentType("application/force-download");

//设置文件名

response.setHeader("Content-Disposition", "attachment;filename="+fileName);

try {

out = response.getOutputStream();

out.write(FileUtils.readFileToByteArray(file));

out.flush();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

if(out != null){

try {

out.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

}

}