因为要从oss下载、查看、上传工具类，所以对这几个方法做了一个封装，已经经过测试，可以直接使用

1、yml添加上阿里云配置、添加maven配置

注意这里的objectName: xxx/xxx/，前面没有反斜杠/

oss:region: xxxaccessKeyId: xxxxxaccessKeySecret: xxxxxbucket: xxxxxobjectName: xxx/xxx/

<dependency><groupId>com.aliyun.oss</groupId><artifactId>aliyun-sdk-oss</artifactId><version>3.10.2</version>
</dependency>

2、工具类代码

package com.fj.utils;import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.OSSObject;
import com.sun.deploy.net.URLEncoder;
import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletResponse;
import java.io.*;/*** oss文件查看，上传，下载工具类** @author: honry.guan* @date: 2021/2/20 16:45*/
@Data
@Component
public class OssClientUtl {@Value(value = "${oss.region}")private String region;@Value(value = "${oss.accessKeyId}")private String accessKeyId;@Value(value = "${oss.accessKeySecret}")private String accessKeySecret;@Value(value = "${oss.bucket}")private String bucketName;@Value(value = "${oss.objectName}")private String objectName;/*** 通过文件名字读取文件内容** @param fileName 文件名：postman.txt* @return 文件内容字符串*/public String seeByFileName(String fileName) {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);OSSObject ossObject = ossClient.getObject(bucketName, objectName + fileName);BufferedReader reader = new BufferedReader(new InputStreamReader(ossObject.getObjectContent()));StringBuilder sb = new StringBuilder();try {while (true) {String line = reader.readLine();if (line == null) {break;}sb.append(line).append("\n");}reader.close();} catch (IOException e) {e.printStackTrace();}// 关闭OSSClient。ossClient.shutdown();return sb.toString();}/*** 读取文件内容** @param objectName oss完整的key，例子：fj_wechat_web/public/postman.txt* @return 文件内容字符串*/public String seeByObjectName(String objectName) {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);OSSObject ossObject = ossClient.getObject(bucketName, objectName);BufferedReader reader = new BufferedReader(new InputStreamReader(ossObject.getObjectContent()));StringBuilder sb = new StringBuilder();try {while (true) {String line = reader.readLine();if (line == null) {break;}sb.append(line).append("\n");}reader.close();} catch (IOException e) {e.printStackTrace();}// 关闭OSSClient。ossClient.shutdown();return sb.toString();}/*** 读取文件内容** @param url 能直接访问的url* @return 文件名*/public String seeByUrl(String url) {return seeByFileName(getFileNameByUrl(url));}/*** 绝对路径上传文件** @param filePath 绝对路径：D:\postman.txt*/public void upload(String filePath) {try {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);InputStream inputStream = new FileInputStream(filePath);ossClient.putObject(bucketName, objectName + filePath, inputStream);ossClient.shutdown();ossClient.shutdown();} catch (FileNotFoundException e) {e.printStackTrace();}}/*** 网页上传文件** @param file MultipartFile网页上传文件*/public void uploadMultipartFile(MultipartFile file) {try {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);ossClient.putObject(bucketName, objectName + file.getOriginalFilename(), file.getInputStream());ossClient.shutdown();ossClient.shutdown();} catch (IOException e) {e.printStackTrace();}}/*** 通过文件名字下载** @param response response* @param fileName 文件名字，带后缀，例子：postman.txt*/public void downloadByFileName(HttpServletResponse response, String fileName) {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);OSSObject ossObject = ossClient.getObject(bucketName, objectName + fileName);BufferedInputStream in = new BufferedInputStream(ossObject.getObjectContent());try {BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());//通知浏览器以附件形式下载response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));byte[] car = new byte[1024];int len = 0;while ((len = in.read(car)) != -1) {out.write(car, 0, len);}out.flush();out.close();in.close();ossClient.shutdown();} catch (IOException e) {e.printStackTrace();}}/*** 通过oss的完整key下载** @param response   response* @param objectName oss完整的key，例子：fj_wechat_web/public/postman.txt*/public void downloadByObjectName(HttpServletResponse response, String objectName) {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);OSSObject ossObject = ossClient.getObject(bucketName, objectName);BufferedInputStream in = new BufferedInputStream(ossObject.getObjectContent());try {BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());//通知浏览器以附件形式下载response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("postman.txt", "utf-8"));byte[] car = new byte[1024];int len;while ((len = in.read(car)) != -1) {out.write(car, 0, len);}out.flush();out.close();in.close();ossClient.shutdown();} catch (IOException e) {e.printStackTrace();}}/*** 通过oss的完整key下载** @param response   response* @param url 能直接访问的url地址*/public void downloadByUrl(HttpServletResponse response, String url) {downloadByFileName(response,getFileNameByUrl(url));}/*** 判断文件是否存在** @param fileName 文件名：postman.txt* @return true文件存在，false文件不存在*/public boolean isExitByFileName(String fileName) {String endpoint = "http://" + region + ".aliyuncs.com";OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);return ossClient.doesObjectExist(bucketName, objectName + fileName);}/*** 判断文件是否存在** @param url 能直接访问的完整url* @return true文件存在，false文件不存在*/public boolean isExitByUrl(String url) {return isExitByFileName(getFileNameByUrl(url));}/*** 通过url获取文件名* @param url 能够直接访问的url* @return 文件名：postman.txt*/public String getFileNameByUrl(String url){String[] split = url.split("/");return split[split.length-1];}
}

3、测试

@RestController
@RequestMapping("/test")
public class TestController {@Autowiredprivate OssClientUtl ossClientUtl;@GetMapping("/see")public BaseResult see() {return BaseResult.ok(ossClientUtl.seeByFileName("postman.txt"));}@GetMapping("/upload")public BaseResult upload(@RequestParam("file") MultipartFile file) {ossClientUtl.uploadMultipartFile(file);return BaseResult.ok("上传成功");}@GetMapping("/download")public void download(HttpServletResponse response) {String fileName = "postman.txt";ossClientUtl.downloadByFileName(response, fileName);}
}

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java的springboot项目操作阿里云OSS下载文件、查看文件内容、上传文件，自定义工具类

1、yml添加上阿里云配置、添加maven配置

2、工具类代码

3、测试

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