📄 cookiedemo.java
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import javax.servlet.http.HttpServlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import javax.servlet.http.Cookie;
import java.io.PrintWriter;
public class CookieDemo extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html;charset=GB2312");
PrintWriter out = response.getWriter();
//检查名字为register的Cookie是否已存在
boolean registerStatus=false;
Cookie[] cookieArr=request.getCookies(); //取得浏览器端的所有Cookie
if(cookieArr!=null){
for(int i=0;i<cookieArr.length;i++){
if(cookieArr[i].getName().equals("register")){
registerStatus=true; //设置已注册状态
out.println("<html>");
out.println("<head>");
out.println("<title>检测用户注册状态</title>");
out.println("</head>");
out.println("<body>");
out.println("<br>很抱歉!您不能以多个用户身份进行注册</br>");
out.println("<br>如果您希望修改注册信息，请执行注册信息更新.</br>");
out.println("</body>");
out.println("</html>");
break;
}
}
}
if(registerStatus==false){
//创建一个表示已注册的Cookie,并把它输出到客户端保存.
Cookie statusCookie=new Cookie("register","1");
statusCookie.setMaxAge(360*24*60*60); //保留一年
response.addCookie(statusCookie); //输出Cookie信息
out.println("<html>");
out.println("<head>");
out.println("<title>用户注册</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>模拟注册成功</h1>");
out.println("</body>");
out.println("</html>");
}
}
}
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