一.pom.xml

<?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.wj</groupId>
    <artifactId>fastdsf-boot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>fastdsf-boot</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</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-thymeleaf</artifactId>
        </dependency>



        <dependency>
            <groupId>com.github.tobato</groupId>
            <artifactId>fastdfs-client</artifactId>
            <version>1.26.2</version>
        </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>

　二.application.yml

#fastdfs 配置
fdfs:
  so-timeout: 150000
  connect-timeout: 150000  #超时时间
  thumb-image:
    width: 150
    height: 150
  tracker-list:
    - 111.111.111.111:22122 #ip:端口号
spring:
  thymeleaf:
    prefix: classpath:/templates/
  servlet:
    multipart:
      max-file-size: 50MB     #单次单个文件最大大小
      max-request-size: 50MB  #单次上传所有文件的总大小
　　#注意，这里springboot默认配置的大小是1MB和10MB，可能不够用，具体参考MultipartProperties.java

三.FastUtil.java  前提先将Nginx和FastDFS整合

@Component
public class FastUtil {

    private final Logger logger = LoggerFactory.getLogger(FastUtil.class);

    @Autowired
    private FastFileStorageClient fastFileStorageClient;

    /**
     * 文件上传
     * 最后返回fastDFS中的文件名称;
     *
     * @param bytes     文件字节
     * @param fileSize  文件大小
     * @param extension 文件扩展名
     * @return fastDfs路径
     */
    public String uploadFile(byte[] bytes, long fileSize, String extension) {
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
        StorePath storePath = fastFileStorageClient.uploadFile(byteArrayInputStream, fileSize, extension, null);
        return "http://111.111.111.111/"+storePath.getFullPath();
    }

    public byte[] downloadFile(String group,String path) throws IOException {
        DownloadByteArray downloadByteArray = new DownloadByteArray();
        byte[] bytes = fastFileStorageClient.downloadFile(group, path, downloadByteArray);
        return bytes;
    }

}

　四.配置类  FdfsConfig.java

@Configuration
@Import(FdfsClientConfig.class)
@EnableMBeanExport(registration = RegistrationPolicy.IGNORE_EXISTING)
public class FdfsConfig {

}

　五.Controller

@RestController
public class FdfsController {

    @Autowired
    private FastUtil fastDFSClientWrapper;

    private final Logger logger = LoggerFactory.getLogger(FdfsController.class);

    @PostMapping("/upload")
    @ResponseBody
    public String upload(MultipartFile file) throws Exception {
        byte[] bytes = new byte[0];
        try {
            bytes = file.getBytes();
        } catch (IOException e) {
            logger.error("获取文件错误");
            e.printStackTrace();
        }
        //获取源文件名称
        String originalFileName = file.getOriginalFilename();
        //获取文件后缀--.doc
        String extension = originalFileName.substring(originalFileName.lastIndexOf(".") + 1);
        String fileName = file.getName();
        //获取文件大小
        long fileSize = file.getSize();
        System.out.println(originalFileName + "==" + fileName + "==" + fileSize + "==" + extension + "==" + bytes.length);
        String string = fastDFSClientWrapper.uploadFile(bytes, fileSize, extension);
        return string;
    }
    
}

　六.前端页面 index.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
    <meta charset="UTF-8" />
    <title>Insert title here</title>
</head>
<body>
<h1 th:inlines="text">文件上传</h1>
<form action="upload" method="post" enctype="multipart/form-data">
    <p>选择文件: <input type="file" name="file"/></p>
    <p><input type="submit" value="提交"/></p>
</form>
</body>
</html>

 七.开始上传、

 

最后在页面上返回一个URL，可以直接访问

 

 

 

参考博客：

https://www.cnblogs.com/dalianpai/p/11838009.html