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";
    }
}

文件上传

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