Java HTTPClient

Just a quick post with an example of using the Java HTTPClient to make requests to remote web servers. I did not find much in the way of succint examples, so here is one:

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.*;
import org.apache.commons.httpclient.params.HttpMethodParams;

import java.io.*;

public class MyClient {

	public MyClient() {
	}

	private String url;
	
	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public byte[] grok() {
		// 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();

			// Deal with the response.
			// Use caution: ensure correct character encoding and is not binary
			// data
			return 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();
		}
		return null;
	}
}

Done.

Liked this post? Follow this blog to get more.