我使用了hutool的 FileUtil，IdUtil，所以需要引入hutool：
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.8.11</version>
</dependency>
application.yml 中定义上传文件目录：
files:
upload:
path: D:/java_workspace/springboot_demo/upload/
上传页面：
<form action="/files/upload" method="post" enctype="multipart/form-data">
<div><input type="file" name="file"></div>
<div><input type="submit" value="上传"></div>
</form>
上传下载处理：
package com.example.demo.controller;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.IdUtil;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.HashMap;
@RestController
@ResponseBody
@RequestMapping(value ="/files")
public class Files {
@Value("${files.upload.path}")
private String fileUploadPath;
//上传
@PostMapping(value ="/upload")
public String upload(@RequestParam MultipartFile file, HttpServletRequest request, HttpServletResponse response) throws IOException {
String originalFilename = file.getOriginalFilename(); //文件名.jpg
String type = FileUtil.extName(originalFilename);//.jpg
long size = file.getSize();//大小
String uuid = IdUtil.fastSimpleUUID();
String filename = uuid + "." + type;
File uploadFile = new File(fileUploadPath +"/"+ filename);
//先存储到磁盘
if (!uploadFile.getParentFile().exists()) {
uploadFile.getParentFile().mkdirs();
}
file.transferTo(uploadFile);
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setHeader("Content-Type", "text/html;charset=utf-8");
response.setContentType("text/html;charset=utf-8");
String str = "";
str += "<html lang=\"zh-CN\">\n";
str += "<head>\n";
str += "<meta charset=\"utf-8\">\n";
str += "<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\">\n";
str += "</head>\n";
str += "<body>\n";
str += "file: "+originalFilename+" upload success, <br /><a href='/files/download/"+filename+"' target" +
"='_blank'>download" +
"</a" +
">\n";
str += "</body>\n";
str += "</html>\n";
return str;
}
//下载
@GetMapping("/download/{filename}")
public void download(@PathVariable String filename, HttpServletResponse response) throws IOException {
File uploadFile = new File(fileUploadPath +"/"+ filename);
ServletOutputStream os = response.getOutputStream();
response.addHeader("Contene-Disposition","attachment;filename="+ URLEncoder.encode(filename,"UTF-8"));
response.setContentType("application/octet-stream");
os.write(FileUtil.readBytes(uploadFile));
os.flush();
os.close();
}
}
效果：
标签：丝滑,springboot,上传下载,upload,filename,str,import,response,String From： https://www.cnblogs.com/xuxiaobo/p/17061859.html