1.依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
2.controller
package com.upload.upload_demo.controller;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 FileUploadController {
private static final Logger logger = LoggerFactory.getLogger(FileUploadController.class);
// 项目根路径下的目录 -- SpringBoot static 目录相当于是根路径下(SpringBoot 默认)
public final static String UPLOAD_PATH_PREFIX = "static/uploadFile/";
@PostMapping("/upload")
public String upload(MultipartFile uploadFile, HttpServletRequest request){
if(uploadFile.isEmpty()){
//返回选择文件提示
return "请选择上传文件";
}
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd/");
//构建文件上传所要保存的"文件夹路径"--这里是相对路径,保存到项目根路径的文件夹下
String realPath = new String("src/main/resources/" + UPLOAD_PATH_PREFIX);
logger.info("-----------上传文件保存的路径【"+ realPath +"】-----------");
String format = sdf.format(new Date());
//存放上传文件的文件夹
File file = new File(realPath + format);
logger.info("-----------存放上传文件的文件夹【"+ file +"】-----------");
logger.info("-----------输出文件夹绝对路径 -- 这里的绝对路径是相当于当前项目的路径而不是“容器”路径【"+ file.getAbsolutePath() +"】-----------");
if(!file.isDirectory()){
//递归生成文件夹
file.mkdirs();
}
//获取原始的名字 original:最初的,起始的 方法是得到原来的文件名在客户机的文件系统名称
String oldName = uploadFile.getOriginalFilename();
logger.info("-----------文件原始的名字【"+ oldName +"】-----------");
String newName = UUID.randomUUID().toString() + oldName.substring(oldName.lastIndexOf("."),oldName.length());
logger.info("-----------文件要保存后的新名字【"+ newName +"】-----------");
try {
//构建真实的文件路径
File newFile = new File(file.getAbsolutePath() + File.separator + newName);
//转存文件到指定路径,如果文件名重复的话,将会覆盖掉之前的文件,这里是把文件上传到 “绝对路径”
uploadFile.transferTo(newFile);
String filePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + "/uploadFile/" + format + newName;
logger.info("-----------【"+ filePath +"】-----------");
return filePath;
} catch (Exception e) {
e.printStackTrace();
}
return "上传失败!";
}
}