23 posts tagged with "Java"

public static void main(String arg[])   
      {  

      }  

package com.usebrain.util;

public class LoadClass {
 static {
  System.out.println("************LoadClass static block************");
 }
}


package com.usebrain.action;

public class Test {

 public static void main(String[] args) {
  try {
   Class c = Class.forName("com.usebrain.util.LoadClass");
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }
 }
}

package com.usebrain.util;

public class LoadClass {
 static {
  System.out.println("************LoadClass static block************");
 }
 
 public LoadClass() {
     System.out.println("*************LoadClass Constructor************");
   }
}


package com.usebrain.action;

import com.usebrain.util.LoadClass;

public class Test {

 public static void main(String[] args) {

  try {
   System.out.println("first time calls forName method");

   Class loadObj = Class.forName("com.usebrain.util.LoadClass");
   LoadClass loadClass = (LoadClass) loadObj.newInstance();

   System.out.println("\nsecond time calls forName method");
   Class.forName("com.usebrain.util.LoadClass");

  } catch (InstantiationException e) {
   e.printStackTrace();
  } catch (IllegalAccessException e) {
   e.printStackTrace();
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }
 }
}

package com.blog.struts.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.StrutsStatics;

import com.blog.struts.action.LoginAction;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class LoginInterceptor extends AbstractInterceptor implements
		StrutsStatics {

	private static final Log log = LogFactory.getLog(LoginInterceptor.class);
	private static final String USER_HANDLE = "loggedInUser";

	public void init() {
		log.info("Intializing LoginInterceptor");
	}

	public void destroy() {
	}

	public String intercept(ActionInvocation invocation) throws Exception {

		final ActionContext context = invocation.getInvocationContext();
		HttpServletRequest request = (HttpServletRequest) context
				.get(HTTP_REQUEST);
		HttpSession session = request.getSession(true);

		// Is there a "user" object stored in the user's HttpSession?
		Object user = session.getAttribute(USER_HANDLE);
		if (user == null) {
			// The user has not logged in yet.

			/* The user is attempting to log in. */
			if (invocation.getAction().getClass().equals(LoginAction.class))
			{
				return invocation.invoke();
			}
			return "login";
		} else {
			return invocation.invoke();
		}
	}

}

package com.blog.struts.action;

import org.apache.commons.lang.xwork.StringUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
	private String userName;
	private String password;

	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	// all struts logic here
	public String execute() {

		ServletActionContext.getRequest().getSession().setAttribute("loggedInUser", userName);
		return "login-success";

	}

	// simple validation
	public void validate() {
		if (StringUtils.isNotEmpty(userName)
				|| StringUtils.isNotEmpty(password)) {
			addActionMessage("You are valid user!");

		} else {
			addActionError("Username and Password can't be blanked");
		}

	}
}

package com.blog.struts.action;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LogoutAction extends ActionSupport {

	// all struts logic here
	public String execute() {

		ServletActionContext.getRequest().getSession().invalidate();
		addActionMessage("You are successfully logout!");
		return "logout";

	}
}

package com.blog.struts.action;

import com.opensymphony.xwork2.ActionSupport;

public class ProfileAction extends ActionSupport {

	// all struts logic here
	public String execute() {

		return "success";

	}
}