11月14日學習日誌
阿新 • • 發佈：2020-12-19
今天學習了基於servlet的網頁點選計數器。
例項：
package com.runoob.test; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class PageHitCounter */ @WebServlet("/PageHitCounter") public class PageHitCounter extends HttpServlet { private static final long serialVersionUID = 1L; private int hitCount; public void init() { // 重置點選計數器 hitCount = 0; }protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); // 增加 hitCount hitCount++; PrintWriter out = response.getWriter(); String title = "總點選量"; String docType= "<!DOCTYPE html> \n"; out.println(docType + "<html>\n" + "<head><title>" + title + "</title></head>\n" + "<body bgcolor=\"#f0f0f0\">\n" + "<h1 align=\"center\">" + title + "</h1>\n" + "<h2 align=\"center\">" + hitCount + "</h2>\n" + "</body></html>"); } public void destroy() { // 這一步是可選的，但是如果需要，您可以把 hitCount 的值寫入到資料庫 } }
現在通過訪問 http://localhost:8080/TomcatTest/PageHitCounter 來呼叫這個 Servlet。