loginaction.java

本书由浅入深、循序渐进地介绍了MVC的体系结构和如何构建一个基于MVC的Web框架

package com.gf.action;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.*;
public class LoginAction extends Action  {
	public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)  throws Exception {   
		String forwardJsp = "success";
		//将页面提交的进行转换成form
		String username = ((User) form).getUsername();
		String password = ((User) form).getPassword();
		if (username == null && password == null) {
			request.setAttribute("msg", "请输入用户名和密码");
			forwardJsp = "login";
		} else if ("".equals(username) || "".equals(password)) {
			request.setAttribute("msg", "必须输入用户名和密码");
			forwardJsp = "login";
		} else if ("gf".equals(username) && "123456".equals(password)) {
			request.setAttribute("msg", "登录成功");
			forwardJsp = "success"; 
		} else if (!"gf".equals(username) || !"123456".equals(password)) {
			request.setAttribute("msg", "登录失败");
		}
		return mapping.findForward(forwardJsp); 
	}
}