11.文件上传
templates/index.ftl
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>index</title>
</head>
<body>
<h4 style="color: red">${name}</h4>
</body>
</html>
文件上传
页面使用thymeleaf
templates/upload.html：
<!DOCTYPE HTML>
<html>
<head>
<title>upload</title>
</head>
<body>
<h4>文件上传</h4>
<form method="post" enctype="multipart/form-data" action="/fileUpload">
<p><input type="file" name="file"></p>
<p><input type="submit"></p> <h4 style="color: red" th:text="${session.msg}"></h4>
</form>
</body>
</html>
templates/upload2.html:
<!DOCTYPE HTML>
<html>
<head>
<title>upload</title>
</head>
<body>
<h4>文件批量上传</h4>
<form method="post" enctype="multipart/form-data" action="/fileUpload2">
<p><input type="file" name="files"></p>
<p><input type="file" name="files"></p>
<p><input type="submit"></p> <h4 style="color: red" th:text="${session.msg}"></h4>
</form>
</body>
</html>
文件大小限制：
spring.http.multipart.max-request-size=10KB
spring.http.multipart.max-file-size=10KB
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.util.UUID;
@Controller
public class Index2Controller {
@RequestMapping("/upload")
public String upload(){
return "upload";
}
@PostMapping("fileUpload")
public String fileUpload(MultipartFile file, HttpServletRequest request){
try {
//获取真实路径
String dir = request.getServletContext().getRealPath("/files");
File fileDir = new File(dir);
if (!fileDir.exists())
fileDir.mkdirs();
//原始文件名的前缀
String fileSuffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
String fileName = UUID.randomUUID().toString() + fileSuffix;
File files = new File(fileDir + "/" + fileName);
//上传
file.transferTo(files);
} catch (Exception e) {
//e.printStackTrace();
System.out.println(e.toString());
request.getSession().setAttribute("msg","上传失败");
return "redirect:/upload";
}
request.getSession().setAttribute("msg","上传成功");
return "redirect:/upload";
}
@RequestMapping("/upload2")
public String upload2(){
return "upload2";
}
@PostMapping("fileUpload2")
public String fileUpload2(MultipartFile[] files, HttpServletRequest request){
try {
//获取真实路径
String dir = request.getServletContext().getRealPath("/files");
File fileDir = new File(dir);
if (!fileDir.exists())
fileDir.mkdirs();
for (MultipartFile file : files) {
//原始文件名的前缀
String fileSuffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
String fileName = UUID.randomUUID().toString() + fileSuffix;
System.out.println(fileName);
File f = new File(fileDir + "/" + fileName);
//上传
file.transferTo(f);
}
} catch (Exception e) {
//e.printStackTrace();
System.out.println(e.toString());
request.getSession().setAttribute("msg","上传失败");
return "redirect:/upload2";
}
request.getSession().setAttribute("msg","上传成功");
return "redirect:/upload2";
}
}
