📄 cookieservlet.java
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package sessions;import java.io.IOException;import java.io.PrintWriter;import java.util.Random;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.Cookie;import javax.servlet.ServletException;public class CookieServlet extends HttpServlet{ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Cookie[] cookies = request.getCookies(); Cookie token = null; if(cookies != null) { for(int i = 0; i < cookies.length; i++) { if(cookies[i].getName().equals("token")) { // Found a token cookie token = cookies[i]; break; } } } response.setContentType("text/html"); PrintWriter writer = response.getWriter(); writer.println("<html><head><title>Tokens</title></head><body "); writer.println("style=\"font-family:verdana;font-size:10pt\">"); String reset = request.getParameter("reset"); if(token == null || (reset != null && reset.equals("yes"))) { Random rand = new Random(); long id = rand.nextLong(); writer.println("<p>Welcome. A new token " + id + " is now established</p>"); // Set the cookie token = new Cookie("token", Long.toString(id)); token.setComment("Token to identify user"); token.setMaxAge(-1); token.setPath("/cookie/track"); response.addCookie(token); } else { writer.println("Welcome back. Your token is " + token.getValue() + ".</p>"); } String requestURLSame = request.getRequestURL().toString(); String requestURLNew = request.getRequestURL() + "?reset=yes"; writer.println("<p>Click <a href=" + requestURLSame + ">here</a> again to continue browsing with the same identity.</p>"); writer.println("<p>Otherwise, click <a href=" + requestURLNew + ">here</a> again to start browsing with a new identity.</p>"); writer.println("</body></html>"); writer.close(); }}⌨️ 快捷键说明
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