springboot文件上传（单文件上传）与下载
1、前端页面
<!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>文件上传下载</title>
</head>
<body>
<form action="http://localhost:8083/fxglxt/testUploadFile" 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="http://localhost:8080/testUploadFiles">
<p>多文件上传：</p>
<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="http://localhost:8083/fxglxt/testDownload">下载</a>
</body>
</html>
2、后端上传方法，文件一共有三种上传路径
1、使用相对路径，文件保存路径为D:/fxglxt/target/classes/static/web/uploadFiles
2、使用绝对路径，文件上传到D:/fxglxt/src/main/resources/static/web/uploadFiles/文件夹下
3、使用绝对路径，文件上传到d://uploadFiles/文件夹下
/**
* 单文件上传
* @param req
* @param multiReq
*/
@RequestMapping(value = "/testUploadFile", method = RequestMethod.POST)
public void testUploadFile(HttpServletRequest req,
MultipartHttpServletRequest multiReq) {
// 获取上传文件的路径，uploadFilePath 其实是文件带后缀的名字
String uploadFilePath = multiReq.getFile("file1").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);
FileOutputStream fos = null;
FileInputStream fis = null;
try {
//1、使用相对路径
//获取跟目录,文件保存路径为D:/fxglxt/target/classes/static/web/uploadFiles
// File path = new File(ResourceUtils.getURL("classpath:").getPath());
// if(!path.exists()) path = new File("");
// System.out.println("path:"+path.getAbsolutePath());
//
// //如果上传目录为/static/images/upload/，则可以如下获取：
// File upload = new File(path.getAbsolutePath(),"static/web/uploadFiles/");
// if(!upload.exists()) upload.mkdirs();
// System.out.println("upload url:"+upload.getAbsolutePath());
//
//
// fis = (FileInputStream) multiReq.getFile("file1").getInputStream();
// fos = new FileOutputStream(new File(path.getAbsolutePath(),"static/web/uploadFiles/"+ uploadFileName
// + ".")
// + uploadFileSuffix);
//2、使用绝对路径，文件上传到D:/fxglxt/src/main/resources/static/web/uploadFiles/文件夹下
String c=System.getProperty("user.dir");
System.out.println("c"+c);
fis = (FileInputStream) multiReq.getFile("file1").getInputStream();
fos = new FileOutputStream(new File(c+"/src/main/resources/static/web/uploadFiles/" + uploadFileName
+ ".")
+ uploadFileSuffix);
//3、使用绝对路径，文件上传到d://uploadFiles/文件夹下
// fis = (FileInputStream) multiReq.getFile("file1").getInputStream();
// fos = new FileOutputStream(new File(c+"d://uploadFiles/" + uploadFileName
// + ".")
// + uploadFileSuffix);
System.out.println("fos"+fos);
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();
}
}
}
}
3、文件的下载
@RequestMapping(value = "/testDownload", method = RequestMethod.GET)
public void testDownload(HttpServletResponse res) {
// String fileName = "列表.txt";
String path="d://upload/软件工程实训.pdf";
String fileName=path.substring(path.lastIndexOf("/")+1,path.length());
System.out.println("fileName="+fileName);
BufferedInputStream bis = null;
OutputStream os = null;
try {
res.setContentType("application/octet-stream");
res.setHeader("Content-Disposition", "attachment;filename=" + fileName);
res.setHeader("Content-Disposition", "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));
byte[] buff = new byte[1024];
os = res.getOutputStream();
//要下载文件所在的路径以及名称
bis = new BufferedInputStream(new FileInputStream(new File(path)));
// bis = new BufferedInputStream(new FileInputStream(new File("d://upload/"
// + 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");
}
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