listObjectsV2RequestTransformer怎么写
时间: 2024-03-21 13:43:55 浏览: 18
listObjectsV2RequestTransformer 是 Amazon S3 SDK for Java 中的一个类,用于将 ListObjectsV2Request 对象转换为 HttpRequest 对象,以便发送请求。
以下是一个示例代码,可以作为 listObjectsV2RequestTransformer 的实现:
```java
import com.amazonaws.Request;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.model.ListObjectsV2Request;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import java.net.URI;
import java.net.URISyntaxException;
public class MyListObjectsV2RequestTransformer implements Request<HttpRequestBase> {
private final ListObjectsV2Request listObjectsV2Request;
private final AmazonS3 amazonS3;
public MyListObjectsV2RequestTransformer(ListObjectsV2Request listObjectsV2Request, AmazonS3 amazonS3) {
this.listObjectsV2Request = listObjectsV2Request;
this.amazonS3 = amazonS3;
}
@Override
public HttpRequestBase getOriginalRequest() {
return new HttpGet();
}
@Override
public void setEndpoint(URI endpoint) {
// do nothing
}
@Override
public URI getEndpoint() {
try {
URIBuilder uriBuilder = new URIBuilder(amazonS3.getEndpoint());
uriBuilder.setPath(listObjectsV2Request.getBucketName());
// add query parameters
uriBuilder.addParameter("list-type", "2");
if (listObjectsV2Request.getPrefix() != null) {
uriBuilder.addParameter("prefix", listObjectsV2Request.getPrefix());
}
if (listObjectsV2Request.getContinuationToken() != null) {
uriBuilder.addParameter("continuation-token", listObjectsV2Request.getContinuationToken());
}
if (listObjectsV2Request.getMaxKeys() != null) {
uriBuilder.addParameter("max-keys", listObjectsV2Request.getMaxKeys().toString());
}
return uriBuilder.build();
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
}
@Override
public void addHeader(String name, String value) {
// do nothing
}
@Override
public void addParameter(String name, String value) {
// do nothing
}
@Override
public void setContent(Object content) {
// do nothing
}
@Override
public void setHeaders(Iterable<Map.Entry<String, String>> headers) {
// do nothing
}
@Override
public void setParameters(Iterable<Map.Entry<String, String>> parameters) {
// do nothing
}
@Override
public void setEndpoint(String endpoint) {
// do nothing
}
}
```
这个实现中,我们将 listObjectsV2Request 转换为一个 HTTP GET 请求,然后使用 URIBuilder 构建请求的 URL,最后返回一个 HttpGet 对象,即可完成转换。
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