项目结构：

1、单文件上传

upload.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>upload file</title>

</head>

<body>

    <form action="/uploadfile/upload" method="post" enctype="multipart/form-data">

        <input type="file" name="file">

        <input type="submit" value="上传">

    </form>

</body>

</html>

http://localhost:8080/uploadfile/upload

package com.archibladwitwicke.springboot2.chapter03.controller;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.multipart.MultipartFile;

import java.io.File;

@Controller

@RequestMapping("/uploadfile")

public class UploadFileController {

    @RequestMapping("/upload")

    public String upload() {

        return "/upload.html";

    }

    @PostMapping("/upload")

    @ResponseBody

    public String upload(MultipartFile file) {

        if (file.isEmpty()) {

            return "file is null";

        }

        String originFileName = file.getOriginalFilename();

        String destFileLocation = "C:\\Users\\Administrator\\Desktop\\" + originFileName;

        File destFile = new File(destFileLocation);

        try {

            file.transferTo(destFile);

            return "upload ok! upload file location: " + destFileLocation;

        } catch (Exception ex) {

            return "upload false! reason: " + ex.getMessage();

        }

    }

    @RequestMapping("/uploads")

    public String uploads() {

        return "/multiupload.html";

    }

}

2、多文件上传

multiupload.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>upload file</title>

</head>

<body>

    <form action="/uploadfile/uploads" method="post" enctype="multipart/form-data">

        <input type="file" name="files"><br/>

        <input type="file" name="files"><br/>

        <input type="file" name="files"><br/>

        <input type="submit" value="上传">

    </form>

</body>

</html>

http://localhost:8080/uploadfile/uploads

package com.archibladwitwicke.springboot2.chapter03.controller;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.multipart.MultipartFile;

import java.io.File;

@Controller

@RequestMapping("/uploadfile")

public class UploadFileController {

    @RequestMapping("/uploads")

    public String uploads() {

        return "/multiupload.html";

    }

    @PostMapping("/uploads")

    @ResponseBody

    public String uploads(MultipartFile[] files) {

        String result = null;

        if (files.length == 0) {

            return "file is null";

        }

        for (MultipartFile file : files) {

            String originFileName = file.getOriginalFilename();

            String destFileLocation = "C:\\Users\\Administrator\\Desktop\\" + originFileName;

            File destFile = new File(destFileLocation);

            try {

                file.transferTo(destFile);

                result += "upload ok! upload file location: " + destFileLocation;

            } catch (Exception ex) {

                result = "upload false! reason: " + ex.getMessage();

            }

        }

        return result;

    }

}

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