1、创建项目

在这里插入图片描述

2、POM文件

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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 https://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>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xiezhenyu</groupId>
    <artifactId>springbootfileupload</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springbootfileupload</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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

3、启动类

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package com.xiezhenyu.springbootfileupload;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringbootfileuploadApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootfileuploadApplication.class, args);
    }
}

4、编写上传页面

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<html>
<head>
</head>
<body>
<form action="/fileUploadController" method="post" enctype="multipart/form-data">
    <input type="file" name="file"/>
    <input type="submit" value="okok"/>
</form>
</body>
</html>

5、编写Controller

注意：在文件上传方法中，参数的名字必须和html中的name相同。

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package com.xiezhenyu.springbootfileupload.controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
@RestController
public class FileUploadController {
    /**
     * 文件上传
     */
    @PostMapping("/fileUploadController")
    public String fileUpload(MultipartFile file) throws Exception{
        System.out.println(file.getOriginalFilename());
        file.transferTo(new File("d:/"+file.getOriginalFilename()));
        return "yes";
    }
}

6、修改上传文件大小

默认上传的大小为1M一下，要使上传大小变化必须修改application.properties配置文件。

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#配置单个上传文件的大小限制
spring.servlet.multipart.max-file-size=2MB
#配置一次请求（批量）上传文件的总大小
spring.servlet.multipart.max-request-size=20MB