<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.itheima</groupId>
    <artifactId>uploadAndDowload</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>
server.port=8082
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=50MB
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>动态添加文件上传列表</title>
<link th:href="@{/login/css/bootstrap.min.css}" rel="stylesheet">
<script th:src="@{/login/js/jquery.min.js}"></script>
</head>
<body>
    <div th:if="${uploadStatus}" style="color: red"
        th:text="${uploadStatus}">上传成功</div>

    <form th:action="@{/uploadFile}" method="post"
        enctype="multipart/form-data">

        上传文件:&nbsp;&nbsp;<input type="button" value="添加文件" onclick="add()" />

        <div id="file" style="margin-top: 10px;" th:value="文件上传区域"></div>

        <input id="submit" type="submit" value="上传"
            style="display: none;margin-top: 10px;" />
    </form>


    <script type="text/javascript">
        // 动态添加上传按钮
        function add() {
            var innerdiv = "<div>";
            innerdiv += "<input type='file' name='fileUpload' required='required'>" +
                "<input type='button' value='删除' onclick='remove(this)'>";
            innerdiv += "</div>";
            $("#file").append(innerdiv);
            // 打开上传按钮
            $("#submit").css("display", "block");
        }
        // 删除当前行<div>
        function remove(obj) {
            $(obj).parent().remove();
            if ($("#file div").length == 0) {
                $("#submit").css("display", "none");
            }
        }
    </script>
</body>
</html>
package com.itheima.controller;

import java.io.File;
import java.util.UUID;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class FileController {
    // 向文件上传页面跳转
    @GetMapping("/toUpload")
    public String toUpload() {
        return "upload";
    }

    // 文件上传管理
    @PostMapping("/uploadFile")
    public String uploadFile(MultipartFile[] fileUpload, Model model) {
        // 默认文件上传成功，并返回状态信息
        model.addAttribute("uploadStatus", "上传成功！");
        for (MultipartFile file : fileUpload) {
            // 获取文件名以及后缀名
            String fileName = file.getOriginalFilename();
            // 重新生成文件名（根据具体情况生成对应文件名）
            fileName = UUID.randomUUID() + "_" + fileName;
            // 指定上传文件本地存储目录，不存在需要提前创建
            String dirPath = "D:/copy/";
            File filePath = new File(dirPath);
            if (!filePath.exists()) {
                filePath.mkdirs();
            }
            try {
                file.transferTo(new File(dirPath + fileName));
            } catch (Exception e) {
                e.printStackTrace();
                // 上传失败，返回失败信息
                model.addAttribute("uploadStatus", "上传失败： " + e.getMessage());
            }
        }
        // 携带上传状态信息回调到文件上传页面
        return "upload";
    }
}
package com.itheima;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}