JAVA整合阿里云OSS实现文件上传功能

引入maven

<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
        <!--阿里云oss-->

        <dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>2.8.2</version>
        </dependency>

阿里云oss上传工具类

AliOssCloudUtil.java

package com.test.cms.aliyunoss;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.*;

/**
 * 阿里云 OSS文件类
 */
public class AliOssCloudUtil {
    Log log = LogFactory.getLog(AliOssCloudUtil.class);
    private String endpoint = "oss-cn-hangzhou.aliyuncs.com";

    //阿里云的accessKeyId
    private String accessKeyId = "LTAI4GBP";
    
　　//阿里云的accessKeySecret
　　private String accessKeySecret = "mwpBLG";

    //空间
    private String bucketName = "js";

    //文件存储目录
    private String filedir = "val/";

    private OSSClient ossClient;

    public AliOssCloudUtil() {
        ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }

    public String getFiledir() {
        return this.filedir;
    }

    //自定义上传文件夹
    public AliOssCloudUtil(String filedir) {
        this.filedir = filedir;
        ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }

    /**
     * 初始化
     */
    public void init() {
        ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }

    /**
     * 销毁
     */
    public void destory() {
        ossClient.shutdown();
    }

    /**
     * 上传到OSS服务器
     *
     * @param instream 文件流
     * @param fileName 文件名称 包括后缀名
     * @return 出错返回"" ,唯一MD5数字签名
     */
    public String uploadFile2OSS(InputStream instream, String fileName) {
        String ret = "";
        // 判断bucket是否已经存在,不存在进行创建
        if (!doesBucketExist()) {
            createBucket();
        }
        try {
            //创建上传Object的Metadata
            ObjectMetadata objectMetadata = new ObjectMetadata();
            objectMetadata.setContentLength(instream.available());
            objectMetadata.setCacheControl("no-cache");
            objectMetadata.setHeader("Pragma", "no-cache");
            objectMetadata.setContentType(getcontentType(fileName.substring(fileName.lastIndexOf("."))));
            objectMetadata.setContentDisposition("inline;filename=" + fileName);

            // 指定上传文件操作时是否覆盖同名Object。
            // 不指定x-oss-forbid-overwrite时，默认覆盖同名Object。
            // 指定x-oss-forbid-overwrite为false时，表示允许覆盖同名Object。
            // 指定x-oss-forbid-overwrite为true时，表示禁止覆盖同名Object，如果同名Object已存在，程序将报错。
            objectMetadata.setHeader("x-oss-forbid-overwrite", "false");

            String objectName = filedir + fileName;

            //上传文件
            ossClient.putObject(bucketName, objectName, instream, objectMetadata);
            // 封装  url 路径
            String url = "http://" + bucketName + "." + endpoint + "/" + objectName;
            System.out.println(objectName);
            ret = url;
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        } finally {
            ossClient.shutdown();
            try {
                if (instream != null) {
                    instream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return ret;
    }

    /**
     * 判断文件是否存在。doesObjectExist还有一个参数isOnlyInOSS，
     * 如果为true则忽略302重定向或镜像；如果为false，则考虑302重定向或镜像。
     * yourObjectName 表示上传文件到OSS时需要指定包含文件后缀在内的完整路径，例如abc/efg/123.jpg。
     *
     * @return 存在返回true
     */
    public boolean doesObjectExist(String objectName) {
        boolean exists = ossClient.doesObjectExist(bucketName, filedir + objectName);
        return exists;
    }

    /**
     * 判断Bucket是否存在
     *
     * @return 存在返回true
     */
    public boolean doesBucketExist() {
        boolean exists = ossClient.doesBucketExist(bucketName);
        return exists;
    }

    /**
     * 创建Bucket
     */
    public void createBucket() {
        CreateBucketRequest createBucketRequest = new CreateBucketRequest(bucketName);
        // 设置bucket权限为公共读，默认是私有读写
        createBucketRequest.setCannedACL(CannedAccessControlList.PublicRead);
        // 设置bucket存储类型为低频访问类型，默认是标准类型
        createBucketRequest.setStorageClass(StorageClass.IA);
        boolean exists = ossClient.doesBucketExist(bucketName);
        if (!exists) {
            try {
                ossClient.createBucket(createBucketRequest);
                // 关闭client
                ossClient.shutdown();
            } catch (Exception e) {
                log.error(e.getMessage());
            }
        }
    }

    /**
     * Description: 判断OSS服务文件上传时文件的contentType
     *
     * @param FilenameExtension 文件后缀
     * @return String
     */
    public static String getcontentType(String FilenameExtension) {
        if ("bmp".equalsIgnoreCase(FilenameExtension)) {
            return "image/bmp";
        }
        if ("gif".equalsIgnoreCase(FilenameExtension)) {
            return "image/gif";
        }
        if ("jpeg".equalsIgnoreCase(FilenameExtension) ||
                "jpg".equalsIgnoreCase(FilenameExtension) ||
                "png".equalsIgnoreCase(FilenameExtension)) {
            return "image/jpeg";
        }
        if ("html".equalsIgnoreCase(FilenameExtension)) {
            return "text/html";
        }
        if ("txt".equalsIgnoreCase(FilenameExtension)) {
            return "text/plain";
        }
        if ("vsd".equalsIgnoreCase(FilenameExtension)) {
            return "application/vnd.visio";
        }
        if ("pptx".equalsIgnoreCase(FilenameExtension) ||
                "ppt".equalsIgnoreCase(FilenameExtension)) {
            return "application/vnd.ms-powerpoint";
        }
        if ("docx".equalsIgnoreCase(FilenameExtension) ||
                "doc".equalsIgnoreCase(FilenameExtension)) {
            return "application/msword";
        }
        if ("xml".equalsIgnoreCase(FilenameExtension)) {
            return "text/xml";
        }
        return "image/jpeg";
    }

    /**
     * @param fileName
     * @return
     * @Title: getInputStreamByFileUrl
     * @Description: 根据文件路径获取InputStream流
     * @return: InputStream
     */
    public InputStream getInputStreamByFileUrl(String fileName) {
        // ossObject包含文件所在的存储空间名称、文件名称、文件元信息以及一个输入流。
        OSSObject ossObject = ossClient.getObject(bucketName, fileName);
        return ossObject.getObjectContent();
    }
}

控制器类（调用类）

FileUploadController.java

package com.test.cms.controller;

import com.test.cms.aliyunoss.AliOssCloudUtil;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.UUID;

@RestController
public class FileUploadController {

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/file/upload")
    public String upload(@RequestParam("file") MultipartFile file) {
        String filename = file.getResource().getFilename();
        //这里文件名用了uuid 防止重复，可以根据自己的需要来写
        String name = UUID.randomUUID() + filename.substring(filename.lastIndexOf("."), filename.length());
        name = name.replace("-", "");
        InputStream inputStream = null;
        try {
            inputStream = file.getInputStream();
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("上传失败");
        }
        AliOssCloudUtil util = new AliOssCloudUtil();
        //上传成功返回完整路径的url
        String url = util.uploadFile2OSS(inputStream, name);
        return url;
    }

    /**
     * 判断文件是否存在
     * @param fileName  储存的文件名
     * @return
     */
    @GetMapping("/file/exists")
    public Boolean exists(String fileName) {
        AliOssCloudUtil util = new AliOssCloudUtil();
        Boolean bool = util.doesObjectExist(fileName);
        return bool;
    }

    /**
     * 下载oss对应文件
     * @param fileName 储存的文件名
     * @return
     */
    @PostMapping("/file/downLoad")
    public void downloadFile(String fileName, HttpServletResponse response) {
        try {
            AliOssCloudUtil ossClientUtil = new AliOssCloudUtil();
            InputStream is = ossClientUtil.getInputStreamByFileUrl(ossClientUtil.getFiledir() + fileName);
            // 配置文件下载
            response.setHeader("content-type", "application/octet-stream");
            response.setContentType("application/octet-stream");
            // 下载文件能正常显示中文
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            OutputStream os = response.getOutputStream();
            byte[] b = new byte[1024];
            int len = -1;
            while ((len = is.read(b)) != -1) {
                os.write(b, 0, len);
            }
            is.close();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}