loginaction.java

这个是j2eejava web 编程精要十五讲的全部源码。对学习java web编程的人来说是很能得的资料

package struts;

import org.apache.struts.action.*;
import javax.servlet.http.*;
import java.util.*;

public class LoginAction extends Action {
  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response)
  {
    LoginForm loginForm = (LoginForm) form;

    //从form bean中取出表单数据
    String username = loginForm.getUsername();
String password = loginForm.getPassword();

//生成一个Session 对象
      HttpSession session = request.getSession(true);
      session.removeAttribute("username");
      session.setAttribute("username",username);

//生成一个ArrayList对象，并把用户名和密码的值存入该对象中
      ArrayList arr = new ArrayList();
      arr.add(username);
       arr.add(password);

       String prompt;

      //调用模型组件LoginHandler，检查该用户是否已注册
       LoginHandler login = new LoginHandler();
       boolean mark = login.checkLogin(arr);

       if(mark)  prompt = "Success";
         else prompt = "Fail";

      return actionMapping.findForward(prompt);
  }
}