SpringBoot文件上传（MVC情况和webFlux情况）

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<?xml version="1.0" encoding="UTF-8"?>
<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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <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>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

前台（两个js框架自行下载）

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
    <meta charset="UTF-8">
    <title>Index</title>
    <style>
        html, body {
            margin: 0;
            padding: 0;
            height: 100%;
            min-height: 100%;
        .header {
            padding: 1px;
            position: relative;
            left: 0;
            top: 0;
            width: 100%;
            height: 70px;
            background-color: #4E3384;
            color: #c7acff;
        .header h2 {
            text-align: center;
        .header a {
            display: block;
            position: absolute;
            top: 18px;
            right: 15px;
            padding: 8px 15px;
            background-color: #a27bf1;
            color: #fff;
            border-radius: 3px;
            text-decoration: none;
        .container {
            min-height: 100%;
        .main {
            max-width: 1200px;
            margin: 30px auto;
            text-align: center;
        .file-wrap {
            position: relative;
            padding: 8px 10px;
            background-color: #ad0660;
            color: #fff;
            text-decoration: none;
            font-size: 14px;
            border-radius: 3px;
            margin: 60px 25px;
            display: inline-block;
        .file-wrap:hover {
            background-color: #d80b7a;
        .file-input {
            font-size: 0;
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            cursor: pointer;
            opacity: 0;
    </style>
</head>
<div class="container">
    <div class="header">
        <h2>文件上传</h2>
    </div>
    <div class="main">
        <a href="javascript:;" class="file-wrap">单文件上传
            <input type="file" id="singleFile" name="singleFile" class="file-input">
        <a href="javascript:;" class="file-wrap">多文件上传
            <input type="file" id="multiFile" name="multiFile" class="file-input" multiple>
        <div id="imgDiv"></div>
    </div>
</div>
<script th:src="@{js/jquery-3.3.1.min.js}"></script>
<script th:src="@{js/ajaxfileupload.js}"></script>
<script>
    $(document).on('change', '#singleFile', function () {
        $.ajaxFileUpload({
            url: '/upload/single', // 用于文件上传的服务器端请求地址
            secureuri: false, // 是否需要安全协议，一般设置为false
            fileElementId: 'singleFile', // 文件上传域的ID
            dataType: 'json', // 返回值类型 一般设置为json
            // 服务器成功响应处理函数
            success: function (data, status) {
                alert(data.msg);
                if (data.code == 1){
                    $('#imgDiv').append($('<img src="'+ data.data +'">'));
            // 服务器响应失败处理函数
            error: function (data, status, e) {
                alert(e);
        $('#singleFile').val('');
    $(document).on('change', '#multiFile', function () {
        $.ajaxFileUpload({
            url: '/upload/multi', // 用于文件上传的服务器端请求地址
            secureuri: false, // 是否需要安全协议，一般设置为false
            fileElementId: 'multiFile', // 文件上传域的ID
            dataType: 'json', // 返回值类型 一般设置为json
            // 服务器成功响应处理函数
            success: function (data, status) {
                alert(data.msg);
                if (data.code == 1){
                    for (var i = 0; i < data.data.length; i++){
                        $('#imgDiv').append($('<img src="'+ data.data[i] +'">'));
            // 服务器响应失败处理函数
            error: function (data, status, e) {
                alert(e);
        $('#multiFile').val('');
</script>
</body>
</html>

最后是Java代码

这个是通用的返回结果

package com.example.demo;
import lombok.Data;
@Data
public class BaseResponse<T> {
    private T data;
    private int code = 1;   // 0-false；1-true；默认1
    private String msg = "success";
下面是核心上传代码（一个单文件上传，一个多文件上传）
package com.example.demo;
import org.apache.commons.io.FileUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
@RestController
@RequestMapping("/upload")
public class FileController {
    @PostMapping("/single")
    public BaseResponse<String> single(@RequestParam("singleFile") MultipartFile file, HttpServletRequest req) throws IOException {
        String fileName = file.getOriginalFilename();
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        String newFileName = new Date().getTime() + "";
        String fileSize = FileUtils.byteCountToDisplaySize(file.getSize());
        System.out.println("文件名：" + fileName);
        System.out.println("文件大小：" + fileSize);
        String path = req.getServletContext().getRealPath("/MyFiles/"); // 保存在项目运行目录下的MyFiles文件夹
        File targetFile = new File(path + newFileName + fileType);
        FileUtils.copyInputStreamToFile(file.getInputStream(), targetFile);
        String imgPath = targetFile.getPath();
        System.out.println("保存路径：" + imgPath);
//        String url = req.getScheme() + "://" + req.getServerName() + req.getContextPath() +
//                "/MyFiles/" + newFileName + fileType;
        String url = req.getScheme() + "://" + req.getServerName() + ":" + req.getServerPort() + req.getContextPath() +
                "/MyFiles/" + newFileName + fileType;
        System.out.println("URL:" + url);
        BaseResponse<String> response = new BaseResponse<>();
        response.setData(url);
        return response;
    @PostMapping("/multi")
    public BaseResponse<List<String>> multi(@RequestParam("multiFile") MultipartFile[] files, HttpServletRequest req) throws IOException {
        List<String> urls = new ArrayList<>();
        for (MultipartFile file : files){
            String fileName = file.getOriginalFilename();
            String fileType = fileName.substring(fileName.lastIndexOf("."));
            String newFileName = new Date().getTime() + "";
            String fileSize = FileUtils.byteCountToDisplaySize(file.getSize());
            System.out.println("文件名：" + fileName);
            System.out.println("文件大小：" + fileSize);
            String path = req.getServletContext().getRealPath("/MyFiles/");
            File targetFile = new File(path + newFileName + fileType);
            FileUtils.copyInputStreamToFile(file.getInputStream(), targetFile);
            String imgPath = targetFile.getPath();
            System.out.println("保存路径：" + imgPath);
            String url = req.getScheme() + "://" + req.getServerName() + ":" + req.getServerPort() + req.getContextPath() +
                    "/MyFiles/" + newFileName + fileType;
            System.out.println("URL:" + url);
            urls.add(url);
            System.out.println("=======================================");
        BaseResponse<List<String>> response = new BaseResponse<>();
        response.setData(urls);
        return response;
 最后你可以配置上传文件大小，在application.properties
spring.servlet.multipart.max-file-size=5MB
spring.servlet.multipart.max-request-size=10MB
启动项目：http://localhost:8080/
后台打印：
 WebFlux情况（Spring5的新产品）
 这种情况不同于SpringMVC，我只能以我目前开发的情况来说明。我们是前后端分离的项目，前端用vue+vuetify+VueX+Axios，大概思路就是搞一个按钮，当change事件发生就执行上传操作。
<v-btn dark small color="blue darken-1">上传文件
    <input type="file" id="pbFileInput" class="file-input" @change="uploadFile('pbFileInput')"/>
</v-btn>
// id 为文件域的id
uploadFile: function(id){
    let me = this;
    let formData = new window.FormData();
    formData.append('file',document.querySelector('#'+id).files[0])
    let options = {  // 设置axios的参数
        headers: {
            'Content-Type': 'multipart/form-data'
    me.$store.state.axios.post('/upload',formData, options)
        .then(function (response) {
            let data = response.data;
            if (data.code == 0){
                console.log(data);
                document.querySelector('#'+id).value = '';  // 解决上传第二次不能选择同一文件
            } else{
                console.log(data.msg)
        .catch(function (error) {
            console.log(error);
后端(这个是借鉴网友的代码，还可以用)
    private static final String BASE_PATH = "/MyFiles/";
    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public Mono<BaseResponse<String>> requestBodyFlux(@RequestPart("file") FilePart filePart) throws IOException {
        String base = BASE_PATH;  // 存放在当前磁盘的根目录
        System.out.println(filePart.filename());
        Path path = Paths.get(base);
        if (!Files.exists(path)){
            Files.createDirectories(path);
        Path file = Files.createFile(Paths.get(base + filePart.filename()));
        // 方法一
        AsynchronousFileChannel channel =
                AsynchronousFileChannel.open(file, StandardOpenOption.WRITE);
        DataBufferUtils.write(filePart.content(), channel, 0)
                .doOnComplete(() -> {
                    System.out.println("finish");
                .subscribe();
        // 方法二
//        filePart.transferTo(file.toFile());
        System.out.println(file.toString());
        BaseResponse<String> response = new BaseResponse<>();
        response.setData(filePart.filename()); // 把文件名传回给前端
        return Mono.just(response);
 填坑：网友的代码也不是万能的哦
    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public Mono<BaseResponse<String>> requestBodyFlux(@RequestPart("file") FilePart filePart, @RequestHeader("uniqueId") String uniqueId) throws IOException {
        String base = baseConfiguration.getPbUploadPath();  // 存放在当前磁盘的根目录
        if (StringUtils.isEmpty(uniqueId)){
            uniqueId = randomNumber();   // 每个pb协议有个独立的文件夹名称
        String filename = filePart.filename();
        log.info("=======================上传文件=======================");
        log.info(filename);
        log.info(uniqueId);
        Path path = Paths.get(org.apache.commons.lang3.StringUtils.appendIfMissing(base, "/") + uniqueId + "/");
        if (!Files.exists(path)){
            Files.createDirectories(path);
        // 如果存在同名文件，先删除
        Path targetPath = Paths.get(org.apache.commons.lang3.StringUtils.appendIfMissing(base, "/") + uniqueId + "/" + filename);
        if (Files.exists(targetPath)){
            boolean b = Files.deleteIfExists(targetPath);
            log.info("已存在同名文件：" + filename + "，先删除：" + b);
        // 再建立新的
        Path tempFile = Files.createFile(targetPath);
        // 方法一
        AsynchronousFileChannel channel =
                AsynchronousFileChannel.open(tempFile, StandardOpenOption.WRITE);
        DataBufferUtils.write(filePart.content(), channel, 0)
                .doOnComplete(() -> {
                    log.info("文件写入完毕...");
                    // 不关闭的话如果再上传同一个文件，会报错：java.nio.file.AccessDeniedException，因为资源被占用，无法删除
                    log.info("文件流关闭...");
                    try {
                        channel.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                        log.info("文件流关闭失败...");
                .subscribe();
        // 方法二
//        filePart.transferTo(tempFile.toFile());
        log.info(tempFile.toString());
        log.info("=======================--------=======================");
        BaseResponse<String> response = new BaseResponse<>();
        response.setData(filename + "," + uniqueId); // 把唯一id和文件名传回给前端
        return Mono.just(response);
生成随机文件夹名字
    private String randomNumber(){
        long time = new Date().getTime();
        String s = time + "";
        Random random = new Random();
        for (int i = 0; i < 4; i++){
            s += random.nextInt(10);
        return s;
我已经测试这种方式可以行得通