使用java将Base64编码的图像上载到AmazonS3
我正在尝试使用Amazon的JavaAPI将文件上传到AmazonS3存储。代码是使用java将Base64编码的图像上载到AmazonS3,java,amazon-web-services,amazon-s3,Java,Amazon Web Services,Amazon S3,我正在尝试使用Amazon的JavaAPI将文件上传到AmazonS3存储。代码是 Byte[] b = data.getBytes(); InputStream stream = new ByteArrayInputStream(b); //InputStream stream = new FileInputStream(new File("D:/samples/test.txt")); AWSCredentials credentials = new BasicAWSCredentials
Byte[] b = data.getBytes();
InputStream stream = new ByteArrayInputStream(b);
//InputStream stream = new FileInputStream(new File("D:/samples/test.txt"));
AWSCredentials credentials = new BasicAWSCredentials("<key>", "<key1>");
AmazonS3 s3client = new AmazonS3Client(credentials);
s3client.putObject(new PutObjectRequest("myBucket",name,stream, new ObjectMetadata()));
Byte[]b=data.getBytes();
InputStream=新的ByteArrayInputStream(b);
//InputStream=新文件InputStream(新文件(“D:/samples/test.txt”);
AWSCredentials credentials=新的基本WSCredentials(“,”);
AmazonS3 s3client=新的AmazonS3客户端(凭据);
s3client.putObject(新的PutObjectRequest(“myBucket”、名称、流、新的ObjectMetadata());
当我在注释前两行并取消注释第三行之后运行代码时,即stream
是FileoutputStream
,文件已正确上载。但是当数据
是base64编码字符串(即图像数据)时,会上载文件,但图像已损坏。
Amazon文档说,我需要创建并附加一个POST策略和签名,以使其生效。我如何在java中做到这一点?我没有使用
html
表单进行上传 首先应该删除数据:image/png;base64,从字符串的开头开始:
示例代码块:
下面是一个DTO类,它接收直接从客户端传入的base64Image数据,并将其解析为不同的组件,这些组件可以轻松地在UploadToWSS3方法中传递:
public class Base64ImageDto {
private byte[] imageBytes;
private String fileName;
private String fileType;
private boolean hasErrors;
private List<String> errorMessages;
private static final List<String> VALID_FILE_TYPES = new ArrayList<String>(3);
static {
VALID_FILE_TYPES.add("jpg");
VALID_FILE_TYPES.add("jpeg");
VALID_FILE_TYPES.add("png");
}
public Base64ImageDto(String b64ImageData, String fileName) {
this.fileName = fileName;
this.errorMessages = new ArrayList<String>(2);
String[] base64Components = b64ImageData.split(",");
if (base64Components.length != 2) {
this.hasErrors = true;
this.errorMessages.add("Invalid base64 data: " + b64ImageData);
}
if (!this.hasErrors) {
String base64Data = base64Components[0];
this.fileType = base64Data.substring(base64Data.indexOf('/') + 1, base64Data.indexOf(';'));
if (!VALID_FILE_TYPES.contains(fileType)) {
this.hasErrors = true;
this.errorMessages.add("Invalid file type: " + fileType);
}
if (!this.hasErrors) {
String base64Image = base64Components[1];
this.imageBytes = javax.xml.bind.DatatypeConverter.parseBase64Binary(base64Image);
}
}
}
public byte[] getImageBytes() {
return imageBytes;
}
public void setImageBytes(byte[] imageBytes) {
this.imageBytes = imageBytes;
}
public boolean isHasErrors() {
return hasErrors;
}
public void setHasErrors(boolean hasErrors) {
this.hasErrors = hasErrors;
}
public List<String> getErrorMessages() {
return errorMessages;
}
public void setErrorMessages(List<String> errorMessages) {
this.errorMessages = errorMessages;
}
public String getFileType() {
return fileType;
}
public void setFileType(String fileType) {
this.fileType = fileType;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
}
对于使用更高版本SDK的用户: 实施组:
software.amazon.awssdk
,名称:s3
,版本:2.10.3
byte[] bI = Base64.decodeBase64((base64Data.substring(base64Data.indexOf(",") + 1)).getBytes());
InputStream fis = new ByteArrayInputStream(bI);
amazonS3Client.putObject(PutObjectRequest.builder().bucket(bucketName).key(fileName)
.contentType(contentType)
.contentLength(Long.valueOf(bI.length))
.build(),
RequestBody.fromInputStream(fis, Long.valueOf(bI.length)));
如何上传图像(png/jpg)的示例代码如下。-
然而,我没有使用任何编码或解码的概念。这个平面使用了简单的元数据内容类型“image/jpg” 问题真的很好+1问得好,有没有运气弄明白?使用java8,您可以使用内置的util对字符串进行解码:
byte[]bI=java.util.Base64.getDecoder.decode(base64Data)
public void uploadBase64Image(Base64ImageDto base64ImageDto, String pathToFile) {
InputStream stream = new ByteArrayInputStream(base64ImageDto.getImageBytes());
ObjectMetadata metadata = new ObjectMetadata();
metadata.setContentLength(base64ImageDto.getImageBytes().length);
metadata.setContentType("image/"+base64ImageDto.getFileType());
String bucketName = awsS3Configuration.getBucketName();
String key = pathToFile + base64ImageDto.getFileName();
try {
LOGGER.info("Uploading file " + base64ImageDto.getFileName() + " to AWS S3");
PutObjectRequest objectRequest = new PutObjectRequest(bucketName, key, stream, metadata);
objectRequest.setCannedAcl(CannedAccessControlList.PublicRead);
Upload s3FileUpload = s3TransferManager.upload(objectRequest);
s3FileUpload.waitForCompletion();
} catch (Exception e) {
e.printStackTrace();
LOGGER.info("Error uploading file " + base64ImageDto.getFileName() + " to AWS S3");
}
}
byte[] bI = Base64.decodeBase64((base64Data.substring(base64Data.indexOf(",") + 1)).getBytes());
InputStream fis = new ByteArrayInputStream(bI);
amazonS3Client.putObject(PutObjectRequest.builder().bucket(bucketName).key(fileName)
.contentType(contentType)
.contentLength(Long.valueOf(bI.length))
.build(),
RequestBody.fromInputStream(fis, Long.valueOf(bI.length)));
try {
BasicAWSCredentials awsCreds = new BasicAWSCredentials(accessKey, secretKey);
AmazonS3 s3Client =
AmazonS3ClientBuilder.standard().withRegion(clientRegion)
.withCredentials(new
AWSStaticCredentialsProvider(awsCreds))
.build();
PutObjectRequest request = new PutObjectRequest(bucketName, fileName, new File(fileToUpload));
ObjectMetadata metadata = new ObjectMetadata();
metadata.setContentType("image/jpg");
request.setMetadata(metadata);
s3Client.putObject(request.withCannedAcl(CannedAccessControlList.PublicRead));
logger.info("File " + fileToUpload + " uploaded to AWS bucket " + bucketName);
} catch (AmazonServiceException e) {
logger.error(e);
fileName = Common.NO_VALUE.toString();
} catch (SdkClientException e) {
logger.error(e);
fileName = Common.NO_VALUE.toString();
}