pom依赖

 <!--aws-s3-->
<dependency><groupId>com.amazonaws</groupId><artifactId>aws-java-sdk-s3</artifactId><version>1.12.95</version></dependency>

S3Utils

import cn.hutool.core.util.ZipUtil;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.*;
import com.crm.common.config.S3Config;
import com.crm.common.enums.ConflictPolicy;
import com.crm.common.utils.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.LinkedList;
import java.util.List;@Component
public class S3Utils {private BasicAWSCredentials awsCreds = null;private AmazonS3 s3 = null;@AutowiredS3Config s3Config;@PostConstructpublic void init() {/*** 创建s3对象*/if (StringUtils.isNotBlank(s3Config.getAccessKey()) && StringUtils.isNotBlank(s3Config.getSecretKey())) {ClientConfiguration config = new ClientConfiguration();AwsClientBuilder.EndpointConfiguration endpointConfig =new AwsClientBuilder.EndpointConfiguration(s3Config.getEndpoint(), "cn-north-1");awsCreds = new BasicAWSCredentials(s3Config.getAccessKey(), s3Config.getSecretKey());s3 = AmazonS3ClientBuilder.standard().withEndpointConfiguration(endpointConfig).withClientConfiguration(config).withCredentials(new AWSStaticCredentialsProvider(awsCreds)).build();}}/*** 上传文件** @param file 文件*/public String uploadFile(MultipartFile file, String moduleName) {return uploadFile(file, ConflictPolicy.NEW, moduleName);}/*** @param file* @param policy     冲突策略,当同一路径下有同名文件时可选。默认是替换同名文件* @param moduleName 项目内的模块名* @return*/public String uploadFile(MultipartFile file, ConflictPolicy policy, String moduleName) {if (isEmpty(file)) {return null;}// 生成临时文件File localFile = null;try {//先从s3服务器上查找是否有同名文件String key = s3Config.getProject() + "/" + moduleName + "/" + file.getOriginalFilename();localFile = File.createTempFile("temp", null);file.transferTo(localFile);String prefix = key.substring(0, key.lastIndexOf("."));String suffix = key.substring(key.indexOf("."));//取出同名文件的最大numberint maxNum = getMaxVersionNum(s3Config.getBucketName(), prefix, suffix);if (maxNum != -1) {switch (policy) {case NEW:key = prefix + "(" + (++maxNum) + ")" + suffix;break;case RETAIN:return "文件已存在,根据冲突策略,文件不予替换";case REPLACE:default:break;}}PutObjectRequest request = new PutObjectRequest(s3Config.getBucketName(), key, localFile);// 上传文件 如果没抛异常则可认为上传成功PutObjectResult putObjectResult = s3.putObject(request);if (StringUtils.isNotEmpty(putObjectResult.getETag())) {return key;}return null;} catch (IOException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();} finally {if (localFile != null) {localFile.delete();}}return null;}private int getMaxVersionNum(String bucketName, String prefix, String suffix) {ListObjectsRequest listRequest = new ListObjectsRequest().withBucketName(bucketName).withPrefix(prefix).withMaxKeys(100);ObjectListing objectListing = s3.listObjects(listRequest);int value = -1;for (S3ObjectSummary inst : objectListing.getObjectSummaries()) {String indexStr = inst.getKey().replace(prefix, "").replace("(", "").replace(")", "").replace(suffix, "");if (indexStr.length() == 0) {indexStr = "0";}value = Math.max(value, Integer.parseInt(indexStr));}return value;}/*** 删除单个文件** @param key 根据key删除文件* @return*/public void deleteObject(String key) {if (StringUtils.isBlank(key)) {throw new IllegalArgumentException("key can not be null");}s3.deleteObject(s3Config.getBucketName(), key);}/*** @param key 根据key得到文件的输入流* @return*/public S3ObjectInputStream getFileInputStream(String key) {S3Object object = s3.getObject(new GetObjectRequest(s3Config.getBucketName(), key));return object.getObjectContent();}/*** 根据key得到输入流并输出到输出流** @param key* @param stream*/public void downloadFile(String key, OutputStream stream) {InputStream input = getFileInputStream(key);byte[] data = null;try {data = new byte[input.available()];int len = 0;while ((len = input.read(data)) != -1) {stream.write(data, 0, len);}} catch (IOException e) {e.printStackTrace();} finally {if (stream != null) {try {stream.close();} catch (IOException e) {e.printStackTrace();}}if (input != null) {try {input.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 根据key得到输入流并输出到输出流** @param key* @param response*/public void downloadFile(String key, HttpServletResponse response) {String fileName = key;byte[] data = null;OutputStream stream = null;InputStream input = getFileInputStream(key);if (key.contains("/")) {String[] path = key.split("/");fileName = path[path.length - 1];}response.setHeader("Content-Disposition", "attachment; filename=" + fileName);try {stream = response.getOutputStream();data = new byte[input.available()];int len = 0;while ((len = input.read(data)) != -1) {stream.write(data, 0, len);}} catch (IOException e) {e.printStackTrace();} finally {if (stream != null) {try {stream.close();} catch (IOException e) {e.printStackTrace();}}if (input != null) {try {input.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 删除文件夹** @param filePath  文件夹地址[ eg:temp/1 或 temp ]* @param deleteAll true-递进删除所有文件（包括子文件夹）；false-只删除当前文件夹下的文件，不删除子文件夹内容*/public void deleteFolder(String filePath, boolean deleteAll) {ListObjectsV2Request objectsRequest = new ListObjectsV2Request();objectsRequest.setBucketName(s3Config.getBucketName());objectsRequest.setPrefix(filePath);// deliter表示分隔符, 设置为/表示列出当前目录下的object, 设置为空表示列出所有的objectobjectsRequest.setDelimiter(deleteAll ? "" : "/");// 设置最大遍历出多少个对象, 一次listobject最大支持1000objectsRequest.setMaxKeys(1000);ListObjectsV2Result listObjectsRequest = s3.listObjectsV2(objectsRequest);List<S3ObjectSummary> objects = listObjectsRequest.getObjectSummaries();String[] object_keys = new String[objects.size()];for (int i = 0; i < objects.size(); i++) {S3ObjectSummary item = objects.get(i);object_keys[i] = item.getKey();}DeleteObjectsRequest dor = new DeleteObjectsRequest(s3Config.getBucketName()).withKeys(object_keys);s3.deleteObjects(dor);}/*** 检查文件是否为空** @param* @return*/public boolean isEmpty(MultipartFile file) {if (file == null || file.getSize() <= 0) {return true;}return false;}/*** 得到所有文件的key** @return key list*/public List<String> getFileKeys() {List<String> keys = new LinkedList<>();ListObjectsRequest listRequest = new ListObjectsRequest().withBucketName(s3Config.getBucketName());try {ObjectListing objects = s3.listObjects(listRequest);while (true) {List<S3ObjectSummary> summaries = objects.getObjectSummaries();for (S3ObjectSummary summary : summaries) {keys.add(summary.getKey());}if (objects.isTruncated()) {objects = s3.listNextBatchOfObjects(objects);} else {break;}}} catch (Exception exception) {exception.printStackTrace();}return keys;}public void getBizFile(List<String> keys, File targetZipFile) {InputStream[] inputStreams = keys.stream().map(this::getFileInputStream).toArray(InputStream[]::new);String[] strings = keys.stream().map(key -> key.split("/")[key.split("/").length - 1]).toArray(String[]::new);ZipUtil.zip(targetZipFile, strings, inputStreams);}public void downBizFile(List<String> keys, HttpServletResponse response) {File file = new File(System.currentTimeMillis() + ".zip");getBizFile(keys, file);OutputStream toClient = null;try {// 以流的形式下载文件。BufferedInputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));byte[] buffer = new byte[fis.available()];fis.read(buffer);fis.close();// 清空responseresponse.reset();toClient = new BufferedOutputStream(response.getOutputStream());response.setCharacterEncoding("UTF-8");response.setContentType("application/octet-stream");response.setHeader("Content-Disposition", "attachment;filename=" + file.getName());toClient.write(buffer);toClient.flush();} catch (Exception e) {e.printStackTrace();} finally {if (toClient != null) {try {toClient.close();} catch (IOException e) {e.printStackTrace();}}//删除改临时zip包(此zip包任何时候都不需要保留,因为源文件随时可以再次进行压缩生成zip包)file.delete();}}}

相关配置类

public enum ConflictPolicy {REPLACE, NEW, RETAIN
}@Component
@ConfigurationProperties(prefix="aws.s3")
public class S3Config {private String accessKey;private String secretKey;private String bucketName;private String region;private String project;private String module;private String endpoint;public String getEndpoint() {return endpoint;}public void setEndpoint(String endpoint) {this.endpoint = endpoint;}public String getModule() {return module;}public void setModule(String module) {this.module = module;}public String getAccessKey() {return accessKey;}public void setAccessKey(String accessKey) {this.accessKey = accessKey;}public String getSecretKey() {return secretKey;}public void setSecretKey(String secretKey) {this.secretKey = secretKey;}public String getBucketName() {return bucketName;}public void setBucketName(String bucketName) {this.bucketName = bucketName;}public String getRegion() {return region;}public void setRegion(String region) {this.region = region;}public String getProject() {return project;}public void setProject(String project) {this.project = project;}
}aws:s3:endpoint: https://s3-xxxxx.comaccessKey: xxxxxsecretKey: xxxxbucketName: xxxregion: cn-north-1project: xxxmodule: dev