单文件html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
<h1 th:inlines="text">文件上传</h1>
<form action="fileUpload" method="post" enctype="multipart/form-data">
<p>选择文件: <input type="file" name="file"/></p>
<p><input type="submit" value="提交"/></p>
</form>
</body>
</html>
多文件html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
<h1 th:inlines="text">文件上传</h1>
<form action="multifileUpload" method="post" enctype="multipart/form-data" >
<p>选择文件1: <input type="file" name="file"/></p>
<p>选择文件2: <input type="file" name="file"/></p>
<p>选择文件3: <input type="file" name="file"/></p>
<p><input type="submit" value="提交"/></p>
</form>
</body>
</html>
单文件上传Controller
@Controller
public class FileUploadController {
/**
* 实现文件上传
* */
@RequestMapping("fileUpload")
@ResponseBody
public String fileUpload(@RequestParam("file") MultipartFile file){
if(file.isEmpty()){
return "false";
}
String fileName = file.getOriginalFilename();
int size = (int) file.getSize();
System.out.println(fileName + "-->" + size);
String path = "F:/test" ;
File dest = new File(path + "/" + fileName);
if(!dest.getParentFile().exists()){
//判断文件父目录是否存在
dest.getParentFile().mkdir();
}
try {
file.transferTo(dest); //保存文件
return "true";
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "false";
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "false";
}
}
}
多文件上传Controller
/**
* 实现多文件上传
* */
@PostMapping("multifileUpload")
@ResponseBody
public String multifileUpload(HttpServletRequest request){
List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("fileName");
if(files.isEmpty()){
return "false";
}
String path = "F:/test" ;
for(MultipartFile file:files){
String fileName = file.getOriginalFilename();
int size = (int) file.getSize();
System.out.println(fileName + "-->" + size);
if(file.isEmpty()){
return "false";
}else{
File dest = new File(path + "/" + fileName);
if(!dest.getParentFile().exists()){
//判断文件父目录是否存在
dest.getParentFile().mkdir();
}
try {
file.transferTo(dest);
}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "false";
}
}
}
return "true";
}
}
可能会出现文件超大的问题
在application.yml中声明最大文件大小限制即可
spring:
servlet:
multipart:
max-file-size: 10MB
max-request-size: 100MB
或者创建一个配置类，在配置类中声明
文件的下载
前端（url下载）：
后端：
@GetMapping("download")
@ResponseBody
public String downloadDrawings(HttpServletRequest request,HttpServletResponse response,String path) throws IOException {
if (path != null) {
File file = new File(path);
String fileName = file.getName();
if (file.exists()) {
response.setContentType("application/octet-stream");//
response.setHeader("content-type", "application/octet-stream");
response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名
byte[] buffer = new byte[1024];
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
OutputStream os = response.getOutputStream();
int i = bis.read(buffer);
while (i != -1) {
os.write(buffer, 0, i);
i = bis.read(buffer);
}
System.out.println("success");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
return null;
}