一、创建简单的springboot-web项目
二、文件上传属性配置
#默认支持文件上传 spring.http.multipart.enabled =true spring.http.multipart.file-size-threshold =0 # 上传文件的临时目录 #spring.http.multipart.location=E:/upload/temp/ # 最大支持文件大小 spring.http.multipart.max-file-size =100MB # 最大支持请求大小 spring.http.multipart.max-request-size =100Mb
三、文件上传代码
1.Controller层代码：
@RestController
public class UploadController {
private static final Logger LOGGER = LoggerFactory.getLogger(UploadController.class);
@GetMapping("/toUpload")
public String upload() {
return "upload";
}
@PostMapping("/upload")
public String UploadFile(@RequestParam("file") MultipartFile file) {
if (file.isEmpty()) {
return "请选择文件";
}
//获取文件名
String fileName = file.getOriginalFilename();
String filePath = "C:/Users/upload/";
File dest = new File(filePath + fileName);
try {
file.transferTo(dest);
LOGGER.info("上传成功");
return "上传成功";
} catch (IOException e) {
LOGGER.error(e.toString(), e);
}
return "上传失败！";
}
}
2.jsp代码
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title>单文件上传</title>
</head>
<body>
<form method="post" action="/upload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
四、文件下载代码
@RequestMapping(value = "/download", method = RequestMethod.GET)
@ResponseBody
public String testDownload(HttpServletResponse res,HttpServletRequest request) {
String fileName = "xxx.txt";
String filePath = "D:/uploadFile";
File file = new File(filePath + "/" + fileName);
System.out.println(file);
if (file.exists()){//判断文件是否存在
//判断浏览器是否为火狐
try {
if ("FF".equals(getBrowser(request))) {
// 火狐浏览器 设置编码new String(realName.getBytes("GB2312"), "ISO-8859-1");
fileName = new String(fileName.getBytes("GB2312"), "ISO-8859-1");
}else{
fileName = URLEncoder.encode(fileName, "UTF-8");//encode编码UTF-8 解决大多数中文乱码
fileName = fileName.replace("+", "%20");//encode后替换空格 解决空格问题
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
res.setContentType("application/force-download");//设置强制下载
res.setHeader("Content-Disposition", "attachment;filename=" + fileName);//设置文件名
byte[] buff = new byte[1024];// 用来存储每次读取到的字节数组
//创建输入流（读文件）输出流（写文件）
BufferedInputStream bis = null;
OutputStream os = null;
try {
os = res.getOutputStream();
bis = new BufferedInputStream(new FileInputStream(file));
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();
}
}
if (os != null){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}else {
return "文件不存在！！！";
}
return "download success";
}
/**
* @Title: getBrowser
* @Description: 判断客户端浏览器
* @return String
* @author
* @date
*/
private static String getBrowser(HttpServletRequest request) {
String UserAgent = request.getHeader("USER-AGENT").toLowerCase();
if (UserAgent != null) {
if (UserAgent.indexOf("msie") != -1)
return "IE";
if (UserAgent.indexOf("firefox") != -1)
return "FF";
if (UserAgent.indexOf("safari") != -1)
return "SF";
}
return null;
}
}
五、测试