📄 login.java

📁 解压在c盘

💻 JAVA

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import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
public class Login extends HttpServlet
{
	public void service(HttpServletRequest rq,HttpServletResponse rp)
	                     throws ServletException,IOException
	 {
	 	Cookie[] cookies;
	 	String[] userList={"zhang","li","wang"};
	 	String[] pwdList={"zhang","li","wang"};
	 	boolean userok=false,pwdok=false;
	 	
	 	
	 	String user=rq.getParameter("user");
	 	String pwd=rq.getParameter("pwd");
	 	
	 	if((user==null)&&(pwd==null))
	 	{
	 		cookies=rq.getCookies();
	 		user=ServletUtilities.getCookievalue(cookies,"user","test");
	 		pwd=ServletUtilities.getCookievalue(cookies,"user","test");
	 	}
	 	else
	 	{
	 		Cookie c;
	 		c=new Cookie("user",user);
	 		c.setMaxAge(100*60);
	 		rp.addCookie(c);
	 		
	 		c=new Cookie("pwd",pwd);
	 		c.setMaxAge(100*60);
	 		rp.addCookie(c);
	 	}
	 	
	 	for(int i=0;i<userList.length;i++)
	 	{
	 		if(user.equalsIgnoreCase(userList[i]))
	 		{
	 			userok=true;
	 			break;
	 		}
	 	}
	 	
	 	for(int i=0;i<pwdList.length;i++)
	 	{
	 		if(pwd.equalsIgnoreCase(pwdList[i]))
	 		{
	 			pwdok=true;
	 			break;
	 		}
	 	}
	 	
	 	PrintWriter out=rp.getWriter();
	 	out.println("<html><head><title>ServletCookie</title></head><body>");
	 	
	 	if(userok&&pwdok)
	 	{
	 		out.println("ok");
	 	}
	 	else
	 	{
	 		out.println("error");
	 	}
	 	out.println("</body></html>");
	 }
}
class ServletUtilities
{
	public static String getCookievalue(Cookie[] cookies,String cookieName,String 
	                                       defaultvalue)
	{
		for(int i=0;i<cookies.length;i++)
		{
			Cookie cookie=cookies[i];
			if(cookieName.equals(cookie.getName()))
			 return(cookie.getValue());
			 
		}
		return(defaultvalue);
	}
}

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