📄 cookiecounter.java
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package servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
@SuppressWarnings("serial")
public class CookieCounter extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void service(HttpServletRequest request,
HttpServletResponse response) throws IOException {
boolean cookieFound = false;
Cookie thisCookie = null;
response.setContentType("text/html;charset=gb2312;");
PrintWriter out = response.getWriter();
Cookie[] cookies = request.getCookies();
if (cookies != null){
for (int i = 0; i < cookies.length; i++) {
thisCookie = cookies[0];
if (thisCookie.getName().equals("CookieCount")) {
cookieFound = true;
break;
}
}
}
if (cookieFound == false) {
thisCookie = new Cookie("CookieCount", "1");
thisCookie.setMaxAge(10);
response.addCookie(thisCookie);
}
out.println("<html><head>\n" +
"<title>阅微草堂</title>\n" +
"</head>\n" +
"<body><p><font color=red>" +
"<center><h3>阅微草堂</h3></center></font>");
out.println("<p>欢迎来到阅微草堂！</p>");
if (cookieFound) {
int cookieCount = Integer.parseInt(thisCookie.getValue());
cookieCount++;
thisCookie.setValue(String.valueOf(cookieCount));
thisCookie.setMaxAge(10);
response.addCookie(thisCookie);
out.println("<p>这是您在近" + 10*(Integer.parseInt((thisCookie.getValue()))-1)
+ "秒钟内第 " + thisCookie.getValue() + " 次光临寒舍！</p>");
}
else {
out.println( "<p>您至少已经10秒钟没有光临寒舍了！</p>");
}
out.println("</body></html>");
}
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