usernamefilter.java

在学习完JAVA基础后,做的一个小小的项目.一个简单的聊天程序.呵呵,看看吧,那时候才刚刚接触到DAO,哎,惊叹的是设计思想. 呵呵,如果你也刚刚学完JAVA基础,有对SWING,AWT比较喜欢的话

package server.business.filter;
import server.model.*;
import server.dao.*;
import java.util.Map;
public class UserNameFilter extends Filter {
	public String doFilter(String userName,String password1,String password2,String name,String classNumber,String email,String phone){
		UserDAOFactory factory=UserDAOFactory.newInstance();
		UserDAO dao=factory.getUserDAO();
		Map<String,User> users=dao.getAllUsers();
		if (users.containsKey(userName)){
			return "该用户已存在";
		}
		else{
			return super.doFilter(userName,password1,password2,name,classNumber,email,phone);
		}
	}
}