[英]How to limit HttpClient response length
我使用htmlunit
與httpclient
。 如何將httpclient
的response body length
限制為1MB
?
訣竅很簡單。 您必須接受InputStream,從中讀取並在超出限制時停止讀取。
InputStream instream = method.getResponseBodyAsStream();
我做了一個調整apache示例的示例。
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class HttpClientTutorial {
private static String url = "http://www.apache.com";
private static final int LIMIT = 1024*1024;//set to 1MB
public static void main(String[] args) {
// Create an instance of HttpClient.
HttpClient client = new HttpClient();
// Create a method instance.
GetMethod method = new GetMethod(url);
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler(3, false));
try {
// Execute the method.
int statusCode = client.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println("Method failed: " + method.getStatusLine());
}
// Read the response body.
//byte[] responseBody = method.getResponseBody();
byte[] responseBody = null;
InputStream instream = method.getResponseBodyAsStream();
if (instream != null) {
long contentLength = method.getResponseContentLength();
if (contentLength < Integer.MAX_VALUE) { //guard below cast from overflow
ByteArrayOutputStream outstream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
int total = 0;
while ((len = instream.read(buffer)) > 0 && total<LIMIT) {
outstream.write(buffer, 0, len);
total+= len;
}
responseBody = outstream.toByteArray();
outstream.close();
instream.close();
System.out.println(new String(responseBody));
}
}
} catch (HttpException e) {
System.err.println("Fatal protocol violation: " + e.getMessage());
e.printStackTrace();
} catch (IOException e) {
System.err.println("Fatal transport error: " + e.getMessage());
e.printStackTrace();
} finally {
// Release the connection.
method.releaseConnection();
}
}
}
我希望這有幫助。
您可以使用Apache Commons的BoundedInputStream 。 這是一個只提供一定長度字節的流 - 如果它的位置高於該值,它將停止。
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