Monday, September 21, 2009

HttpClient 4.0, a quick tutorial

A simple start:

package com.acme.stress;

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;

/**
* Generate a load on the Webapp
* @author levieuxbarbu
*
*/
public class StressTest {

public static void main(String[] args) throws ClientProtocolException, IOException {
StressTest stressTest = new StressTest();
stressTest.run();
}

private void run() throws ClientProtocolException, IOException {

DefaultHttpClient httpclient = new DefaultHttpClient();
HttpUriRequest request = new HttpGet("http://www.lesjoliesnana.com/");
HttpResponse response = httpclient.execute(request);
System.out.println(response);
}

}



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A more complex example to generate multiple clients hammering the server with requests:


package com.acme.stress;

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;

/**
* Generate a load on the Webapp
* @author vernetto
*
*/
public class StressTest implements Runnable {
public static int NUMBER_OF_VUSERS = 2;
public static int PAUSE_BETWEEN_TESTS_IN_SECONDS = 10;
public static int NUMBER_OF_CYCLES = 2;

public static void main(String[] args) throws ClientProtocolException, IOException {
Thread[] threads = new Thread[NUMBER_OF_VUSERS];
for (int i = 0 ; i < NUMBER_OF_VUSERS; i++) {
StressTest stressTest = new StressTest(Integer.toString(i));
Thread thread = new Thread(stressTest);
threads[i] = thread;
thread.start();
}
}

private String name;


public StressTest (String name) {
this.name = name;
}

public void run() {
// TODO Auto-generated method stub
for (int i = 0 ; i < NUMBER_OF_CYCLES; i++) {
try {
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpUriRequest request = new HttpGet("http://myserver.com/");
System.out.println("executing request # " + i + " for tester " + name);
HttpResponse response = httpclient.execute(request);

Thread.sleep(PAUSE_BETWEEN_TESTS_IN_SECONDS * 1000);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

}

2 comments:

raj said...

really helpful example. is there a way redirect the requests through a public proxy so that my Ip doesn't get blocked?

Pierre said...

yes I vaguely remember that you have to set a couple of -D properties in your JVM command line... see here
http://java.sun.com/javase/6/docs/technotes/guides/net/proxies.html

http.proxyHost and http.proxyPort