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 Tools and Libs > Commons Http Client > Basic Authentication

Basic Authentication 

Commons Http Client is a HTTP agent implementation in java supporting client-side authentication, HTTP state management and HTTP connection management. This requires the libraries httpclient-4.1.2.jar, httpcore-4.1.2.jar, httpmime-4.1.2.jar, httpclient-cache-4.1.2.jar, commons-codec.jar and commons-logging-1.1.1.jar to be in classpath. The following example shows how to access a JSP page protected through basic authentication in Tomcat v6.0.

Configure a new tomcat user venakat and role btc in tomcat-users.xml as shown below,

File Name  :  
/HTTP_TEST_APP/tomcat_config_files/tomcat-users.xml 

Configure BASIC Authentication for HTTP_TEST_APP in web.xml as shown below,

File Name  :  
/HTTP_TEST_APP/tomcat_config_files/basic_auth_web.xml 

A simple JSP page protected through BASIC Authentication.

File Name  :  
/HTTP_TEST_APP/WebContent/basic_protected.jsp 

A simple Http Client to access the protected JSP. We can see that the basic authentiction information is passed as request header in the format Authorization : Basic Base64(username:password)

File Name  :  
com/bethecoder/tutorials/commons_httpclient/BasicAuthenticationTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.commons_httpclient;

import java.io.IOException;

import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;

public class BasicAuthenticationTest {

  /**
   @param args
   @throws IOException 
   @throws ClientProtocolException 
   */
  public static void main(String[] argsthrows ClientProtocolException, IOException {
    DefaultHttpClient httpclient = new DefaultHttpClient();
    HttpGet httpget = new HttpGet("http://localhost:8080/HTTP_TEST_APP/basic_protected.jsp");
    System.out.println("Requesting : " + httpget.getURI());

    try {
      UsernamePasswordCredentials creds = new UsernamePasswordCredentials("venkat""mypassword");
      httpget.addHeader(new BasicScheme().authenticate(creds, httpget));

      ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String responseBody = httpclient.execute(httpget, responseHandler);
            
      System.out.println("responseBody : " + responseBody);
    catch (AuthenticationException e) {
      e.printStackTrace();
    finally {
       httpclient.getConnectionManager().shutdown();
    }

  }

}
   

It gives the following output,
File Name  :  OUTPUT


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