首先,创建一个index.html页面
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="upload" method="post" enctype="multipart/form-data">
<input type="file" name="file"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
然后,在Controller中新建文件上传方法
package com.example.demo.controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
@RestController
public class TestController {
SimpleDateFormat sdf = new SimpleDateFormat("/yyyy/MM/dd/");//根据日期创建文件分级目录
@PostMapping("/upload")
public void upload(MultipartFile file,HttpServletRequest req) throws IOException {
String format = sdf.format(new Date());
String realPath = req.getServletContext().getRealPath("/img")+ format;//我们即将要保存的位置
System.out.println(realPath);
File folder = new File(realPath);
if(!folder.exists()){//判断是否存在文件
folder.mkdirs();
}
String oldName = file.getOriginalFilename();
String newName = UUID.randomUUID().toString() + oldName.substring(oldName.lastIndexOf("."),oldName.length());
file.transferTo(new File(folder,newName));//保存文件
String url = req.getScheme() + "//" + req.getServerName() + ":" + req.getServerPort() + "/img" + format + newName;
System.out.println(url);//文件的访问路径
}
}
至此,我们的文件上传功能已实现,我们还可以继续在application.properties中增加一些文件属性相关信息
#上传的单个文件的大小
spring.servlet.multipart.max-file-size=1MB
#上传的文件总大小
spring.servlet.multipart.max-request-size=10MB
#文件上传临时保存目录
spring.servlet.multipart.location=
#文件上传临界值(超过这个临界值,就要保存到location中去了)
spring.servlet.multipart.file-size-threshold=1MB