引自：https://blog.csdn.net/tomcat_2014/article/details/50582547
一 .Amazon S3介绍
Amazon Simple Storage Service (Amazon S3) 是一种对象存储，它具有简单的 Web 服务接口，可用于在 Web 上的任何位置存储和检索任意数量的数据。它能够提供 99.999999999% 的持久性，并且可以在全球大规模传递数万亿对象。
客户使用 S3 作为云原生应用程序的主要存储；作为分析的批量存储库或“数据湖”；作为备份和恢复以及灾难恢复的目标；并将其与无服务器计算配合使用。
使用 Amazon 的云数据迁移选项，客户可以轻松地将大量数据移入或移出 Amazon S3。数据在存储到 S3 中之后，会自动采用成本更低、存储期限更长的云存储类 (如 S3 Standard – Infrequent Access 和 Amazon Glacier) 进行存档。
二.Java S3 Example
准备工作：
1.导入依赖包
<dependency>
<groupId>com.amazonaws</groupId>
<artifactId>aws-java-sdk</artifactId>
<version>1.9.2</version>
</dependency>
2.在s3服务中创建用户，获取用户的Access key和Secret Access Key，使用这个作为凭证连接s3
3.在s3服务中配置AWSConnector和AmazonS3FullAccess的连接权限。可以通过这个配置，在访问的时候进行authenticate验证。
s3 api简单操作：
1.创建凭证
AWSCredentials credentials = new BasicAWSCredentials("YourAccessKeyID", "YourSecretAccessKey");
2.创建S3 Client
AmazonS3 s3client = new AmazonS3Client(credentials);
3.创建Bucket
String bucketName = "javatutorial-net-example-bucket";
s3client.createBucket(bucketName);
4.获取s3 Bucket的list
for (Bucket bucket : s3client.listBuckets()) {
System.out.println(" - " + bucket.getName());
}
5.在s3 Bucket中创建文件
public static void createFolder(String bucketName, String folderName, AmazonS3 client) {
// create meta-data for your folder and set content-length to 0
ObjectMetadata metadata = new ObjectMetadata();
metadata.setContentLength(0);
// create empty content
InputStream emptyContent = new ByteArrayInputStream(new byte[0]);
// create a PutObjectRequest passing the folder name suffixed by /
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName,
folderName + SUFFIX, emptyContent, metadata);
// send request to S3 to create folder
client.putObject(putObjectRequest);
}
6.上传文件
String fileName = folderName + SUFFIX + "testvideo.mp4";
s3client.putObject(new PutObjectRequest(bucketName, fileName,
new File("C:\\Users\\user\\Desktop\\testvideo.mp4")));
7.删除Bucket
s3client.deleteBucket(bucketName);
8.删除文件
s3client.deleteObject(bucketName, fileName);
package com.hx.lubo.web.util;
/**
* Created by Administrator on 2016/1/20.
*/
import com.amazonaws.ClientConfiguration;
import com.amazonaws.Protocol;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.*;
import com.amazonaws.util.StringUtils;
import com.hx.lubo.dto.StorageObjectVo;
import org.springframework.beans.factory.annotation.Value;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
public class FileStorageUtil {
public static AWSCredentials awsCredentials;
@Value("${access_key}")
public static String access_key = "SK3A9042W5IMUJ1WET8V";
@Value("${secret_key}")
private static String secret_key = "c1BgQ8ge9OkZ0rZRSQp985Gauoxjv6laKGH3z02v";
@Value("${endPoint}")
private static String endPoint = "192.168.13.101";
private static AmazonS3 conn;
private SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");//设置日期格式
/**
* 创建连接，连接S3服务器
*/
public void creatConnect() {
if (awsCredentials == null) {
awsCredentials = new BasicAWSCredentials(access_key, secret_key);
ClientConfiguration clientConfig = new ClientConfiguration();
clientConfig.setProtocol(Protocol.HTTP);
conn = new AmazonS3Client(awsCredentials, clientConfig);
conn.setEndpoint(endPoint);
}
}
public AmazonS3 getConnect() {
return conn;
}
/**
* 获取该连接下所有的容器信息
* @return
*/
public List<Bucket> getBuckets() {
List<Bucket> buckets = conn.listBuckets();
return buckets;
}
public Bucket getBuketsByname(String bucketName) {
Bucket resultBucket = null;
if (bucketName.isEmpty()) {
return null;
}
List<Bucket> buckets = conn.listBuckets();
if(buckets == null){
return resultBucket;
}
for (Bucket bucket : buckets) {
if (bucketName.equals(bucket.getName())) {
resultBucket = bucket;
break;
}
}
return resultBucket;
}
/**
* 新建容器名称
* @param bucketName
* @return
*/
public Bucket creatBucket(String bucketName) {
if (bucketName.isEmpty()) {
return null;
}
Bucket bucket = conn.createBucket(bucketName);
return bucket;
}
/**
* 获取该容器下面的所有信息（文件目录集合和文件信息集合）
* @param bucketName
* @return
*/
public ObjectListing getBacketObjects(String bucketName) {
if (bucketName.isEmpty()) {
return null;
}
ObjectListing objects = conn.listObjects(bucketName);
return objects;
}
/**
* 获取某个文件（前缀路径）下的所有信息
* @param bucketName
* @param prefix
* @param isDelimiter
* @return
*/
public ObjectListing getBacketObjects(String bucketName, String prefix,Boolean isDelimiter ) {
if ( bucketName == null || bucketName.isEmpty()) {
return null;
}
ListObjectsRequest objectsRequest = new ListObjectsRequest().withBucketName(bucketName);
if (prefix != null && !prefix.isEmpty()) {
objectsRequest = objectsRequest.withPrefix(prefix);
}
if(isDelimiter){
objectsRequest = objectsRequest.withDelimiter("/");
}
ObjectListing objects = conn.listObjects(objectsRequest);
return objects;
}
/**
* 获取当前容器下面的目录集合
* @param objects
* @return
*/
public List<StorageObjectVo> getDirectList(ObjectListing objects) {
List<StorageObjectVo> diectList = new ArrayList<StorageObjectVo>();
String prefix = objects.getPrefix();
do {
List<String> commomprefix = objects.getCommonPrefixes();
for (String comp : commomprefix) {
StorageObjectVo dirStorageObjectVo = new StorageObjectVo();
String dirName = comp.substring(prefix == null?0:prefix.length(), comp.length()-1);
dirStorageObjectVo.setName(dirName);
dirStorageObjectVo.setType("文件夹");
diectList.add(dirStorageObjectVo);
}
objects = conn.listNextBatchOfObjects(objects);
} while (objects.isTruncated());
return diectList;
}
/**
* 获取当前容器下面的文件集合
* @param objects
* @return
*/
public List<StorageObjectVo> getFileList(ObjectListing objects) {
List<StorageObjectVo> fileList = new ArrayList<StorageObjectVo>();
String prefix = objects.getPrefix();
do {
for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) {
System.out.println(objectSummary.getKey() + "\t" + objectSummary.getSize() + "\t" + StringUtils.fromDate(objectSummary.getLastModified()));
if(prefix!= null && objectSummary.getKey().equals(prefix.trim())){
continue;
}
StorageObjectVo fileStorageObjectVo = new StorageObjectVo();
String fileName = objectSummary.getKey().substring(prefix == null?0:prefix.length(), objectSummary.getKey().length());
// fileStorageObjectVo.setName(objectSummary.getKey());
fileStorageObjectVo.setName(fileName);
fileStorageObjectVo.setType("文件");
fileStorageObjectVo.setSize(bytes2kb(objectSummary.getSize()));
fileStorageObjectVo.setDate(df.format(objectSummary.getLastModified()));
fileList.add(fileStorageObjectVo);
}
objects = conn.listNextBatchOfObjects(objects);
} while (objects.isTruncated());
return fileList;
}
public List<StorageObjectVo> getObjectList(String bucketName, String prefix) {
if ( bucketName == null && bucketName.isEmpty()) {
return null;
}
ListObjectsRequest objectsRequest = new ListObjectsRequest().withBucketName(bucketName);
if (prefix!=null && !prefix.isEmpty()) {
objectsRequest = objectsRequest.withPrefix(prefix);
}
objectsRequest = objectsRequest.withDelimiter("/");
ObjectListing objects = conn.listObjects(objectsRequest);
List<StorageObjectVo> resultList = new ArrayList<StorageObjectVo>();
List<StorageObjectVo> dirList = getDirectList(objects);
if (dirList != null && dirList.size() > 0) {
resultList.addAll(dirList);
}
List<StorageObjectVo> fileList = getFileList(objects);
if (fileList != null && fileList.size() > 0) {
resultList.addAll(fileList);
}
return resultList;
}
//创建文件目录
public Boolean creatpath(String bucketName,String StorageObjectVoPath, String folderName){
if(bucketName == null || folderName == null){
return false;
}
if(StorageObjectVoPath == null || StorageObjectVoPath.isEmpty()|| "null".equals(StorageObjectVoPath)){
StorageObjectVoPath ="";
}
String key = StorageObjectVoPath + folderName+"/";
ByteArrayInputStream local = new ByteArrayInputStream("".getBytes());
PutObjectResult result = conn.putObject(bucketName, key, local, new ObjectMetadata());
return true;
}
public Boolean deleteBucket(String bucketName) {
if (bucketName.isEmpty()) {
return false;
}
Bucket bucket = conn.createBucket(bucketName);
conn.deleteBucket(bucket.getName());
return true;
}
/**
*
* 上传 文件对象到容器
* @param bucketName
* @param StorageObjectVoPath
* @param fileName
* @param uploadFile
* @return
*/
public PutObjectResult creatObject(String bucketName,String StorageObjectVoPath, String fileName, File uploadFile) {
if(StorageObjectVoPath == null || StorageObjectVoPath.isEmpty()|| "null".equals(StorageObjectVoPath)){
StorageObjectVoPath ="";
}
if(uploadFile == null){
return null;
}
String fileAllPath = StorageObjectVoPath + fileName;
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(uploadFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
PutObjectResult result = conn.putObject(bucketName, fileAllPath, inputStream, new ObjectMetadata());
return result;
}
public void changeOBjectACL(String bucketName, String ObjectName, CannedAccessControlList aceess) {
conn.setObjectAcl(bucketName, ObjectName, aceess);
}
public ObjectMetadata download(String bucketName, String objectName, File destinationFile) {
if (bucketName.isEmpty() || objectName.isEmpty()) {
return null;
}
ObjectMetadata result = conn.getObject(new GetObjectRequest(bucketName, objectName), destinationFile);
return result;
}
public S3Object download(String bucketName, String objectName) {
if (bucketName.isEmpty() || objectName.isEmpty()) {
return null;
}
S3Object object = conn.getObject(bucketName, objectName);
return object;
}
public Boolean deleteObject(String bucketName, String objectName) {
if (bucketName.isEmpty() || objectName.isEmpty()) {
return false;
}
conn.deleteObject(bucketName, objectName);
return true;
}
/**生成文件url
*
* @param bucketName
* @param objectName
* @return
*/
public String getDownloadUrl(String bucketName, String objectName) {
if (bucketName.isEmpty() || objectName.isEmpty()) {
return null;
}
GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, objectName);
System.out.println(conn.generatePresignedUrl(request));
return conn.generatePresignedUrl(request).toString();
}
/**
* 移动对象信息到目标容器
* @param OrgbucketName
* @param orgKey
* @param destinationName
* @param destinationKey
* @return
*/
public Boolean moveObject(String OrgbucketName,String orgKey,String destinationName,String destinationKey){
CopyObjectResult result=conn.copyObject(OrgbucketName, orgKey, destinationName, destinationKey);
Boolean isDelete=deleteObject(OrgbucketName,orgKey);
if(result!=null){
return isDelete;
}
return false;
}
/**
* 移动目标文件夹信息到目标容器
* @param objects
* @param destinationBucket
* @return
*/
public Boolean moveForder(ObjectListing objects,String destinationBucket){
String bucketName = objects.getBucketName();
do {
for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) {
System.out.println(objectSummary.getKey() + "\t" + objectSummary.getSize() + "\t" + StringUtils.fromDate(objectSummary.getLastModified()));
CopyObjectResult result=conn.copyObject(bucketName, objectSummary.getKey(), destinationBucket, objectSummary.getKey());
Boolean isDelete=deleteObject(bucketName, objectSummary.getKey());
}
objects = conn.listNextBatchOfObjects(objects);
} while (objects.isTruncated());
return true;
}
/**
* 删除文件夹内容（必须先遍历删除文件夹内的内容）
* @param objects
* @return
*/
public Boolean deleteForder(ObjectListing objects){
String bucketName = objects.getBucketName();
do {
for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) {
System.out.println(objectSummary.getKey() + "\t" + objectSummary.getSize() + "\t" + StringUtils.fromDate(objectSummary.getLastModified()));
Boolean isDelete=deleteObject(bucketName, objectSummary.getKey());
}
objects = conn.listNextBatchOfObjects(objects);
} while (objects.isTruncated());
return true;
}
/**
* 将文件大小格式转为MB格式
* @param bytes
* @return
*/
public static String bytes2kb(long bytes) {
BigDecimal filesize = new BigDecimal(bytes);
BigDecimal megabyte = new BigDecimal(1024 * 1024);
float returnValue = filesize.divide(megabyte, 2, BigDecimal.ROUND_UP)
.floatValue();
if (returnValue > 1)
return (returnValue + "MB");
BigDecimal kilobyte = new BigDecimal(1024);
returnValue = filesize.divide(kilobyte, 2, BigDecimal.ROUND_UP)
.floatValue();
return (returnValue + "KB");
}
}