AWS S3使用Demo

public class AwsClient {  
    static AmazonS3         s3;  
    static TransferManager     tx;  
    private static String AWS_ACCESS_KEY = "AWS_ACCESS_KEY";  
    private static String AWS_SECRET_KEY = "AWS_SECRET_KEY ";  
    static final String bucketName = "bucketName ";  
      
    static {  
        s3 = new AmazonS3Client(new BasicAWSCredentials(AWS_ACCESS_KEY, AWS_SECRET_KEY));  
        Region usWest2 = Region.getRegion(Regions.CN_NORTH_1);  
        s3.setRegion(usWest2);  
    }  
      
    /**  
    * @Title: uploadToS3  
    * @Description: 将文件上传至S3上并且返回url 
    * @param @param tempFile 目标文件 
    * @param @param remoteFileName 文件名 
    * @param @return 
    * @param @throws IOException    设定文件  
    * @return String    返回类型  
    * @throws  
    */  
    public static String uploadToS3(File tempFile, String remoteFileName) throws IOException {  
        try {  
            //上传文件  
            s3.putObject(new PutObjectRequest(bucketName, remoteFileName, tempFile).withCannedAcl(CannedAccessControlList.PublicRead));  
            //获取一个request  
            GeneratePresignedUrlRequest urlRequest = new GeneratePresignedUrlRequest(  
                    bucketName, remoteFileName);  
            //生成公用的url  
            URL url = s3.generatePresignedUrl(urlRequest);  
            System.out.println("=========URL=================" + url + "============URL=============");  
            return url.toString();  
        } catch (AmazonServiceException ase) {  
            ase.printStackTrace();  
        } catch (AmazonClientException ace) {  
            ace.printStackTrace();  
        }  
        return null;  
    }  
  
     /**  
    * @Title: getContentFromS3  
    * @Description: 获取文件2进制流 
    * @param @param remoteFileName 
    * @param @throws IOException    设定文件  
    * @return S3ObjectInputStream    返回类型  数据流 
    * @throws  
    */  
    public static S3ObjectInputStream getContentFromS3(String remoteFileName) throws IOException {  
        try {  
            GetObjectRequest request  = new GetObjectRequest(bucketName,remoteFileName);  
            S3Object object = s3.getObject(request);  
            S3ObjectInputStream inputStream = object.getObjectContent();  
            return inputStream;  
        } catch (Exception e) {  
            e.printStackTrace();  
        }   
        return null;  
     }  
      
      
    /**  
    * @Title: downFromS3  
    * @Description: 将文件下载到本地路径 
    * @param @param remoteFileName 文件名 
    * @param @param path 下载的路径 
    * @param @throws IOException    设定文件  
    * @return void    返回类型  
    * @throws  
    */  
    public static void downFromS3(String remoteFileName,String path) throws IOException {  
        try {  
            GetObjectRequest request  = new GetObjectRequest(bucketName,remoteFileName);  
            s3.getObject(request,new File(path));  
        } catch (Exception e) {  
            e.printStackTrace();  
        }   
    }  
      
    /**  
    * @Title: getUrlFromS3  
    * @Description: 获取文件的url  
    * @param @param remoteFileName 文件名 
    * @param @return 
    * @param @throws IOException    设定文件  
    * @return String    返回类型  
    * @throws  
    */  
    public static String getUrlFromS3(String remoteFileName) throws IOException {  
        try {  
            GeneratePresignedUrlRequest httpRequest=new GeneratePresignedUrlRequest(bucketName, remoteFileName);  
            String url=s3.generatePresignedUrl(httpRequest).toString();//临时链接  
            return url;  
        } catch (Exception e) {  
            e.printStackTrace();  
        }   
        return null;  
    }  
    /** 
     * 验证s3上是否存在名称为bucketName的Bucket 
     * @param s3 
     * @param bucketName 
     * @return 
     */  
    public static boolean checkBucketExists(AmazonS3 s3, String bucketName) {  
        List buckets = s3.listBuckets();  
        for (Bucket bucket : buckets) {  
            if (Objects.equals(bucket.getName(), bucketName)) {  
                return true;  
            }  
        }  
        return false;  
    }  
      
    public static void delFromS3(String remoteFileName) throws IOException {  
        try {  
            s3.deleteObject(bucketName, remoteFileName);  
        } catch (AmazonServiceException ase) {  
            ase.printStackTrace();  
        } catch (AmazonClientException ace) {  
            ace.printStackTrace();  
        }  
    }  
      
    public static void main(String[] args) throws Exception {  
        String key = "redisinfo";  
        File tempFile = new File("C:\\Users\\guosen\\Desktop\\redis.txt");  
        uploadToS3(tempFile,key);//上传文件  
        String url  = getUrlFromS3(key);//获取文件的url  
        System.out.println(url);  
//      delFromS3(key);//删除文件  
    }