自己動手搭建Tomcat下的Servlet，搭建tomcatservlet
我以一個簡單的登入執行個體，來介紹如何在tomcat下搭建一個servlet web程式
1.環境搭建
首先要保證JDK和tomcat安裝成功，並且配置好了環境變數。
通過java -version命令檢測JDK是否安轉並配置成功，如下則配置成功
接下來查看tomcat是否可以正常啟動
雙擊檔案下apache-tomcat-7.0.54\bin\startup.bat以啟動Tomcat伺服器
在瀏覽器中輸入：http://localhost:8080/
2.在tomcat安裝目錄下的webapps檔案夾下，建立專案檔夾test_servlet
並在此檔案夾中，建立WEB_INF檔案夾
進入WEB-INF目錄,建立classes和lib目錄以及web.xml
3.編寫LoginServlet類
import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//接收表單穿過來的參數值 String username = request.getParameter("username"); String password = request.getParameter("password"); //控制台列印輸出參數值以供查看 System.out.println("username=" + username); System.out.println("password=" + password); //設定編碼格式 response.setContentType("text/html;charset=GB18030"); //輸出瀏覽器資訊 response.getWriter().println("<html>"); response.getWriter().println("<head>"); response.getWriter().println("<title>登入資訊</title>"); response.getWriter().println("</head>"); response.getWriter().println("<body>"); response.getWriter().println("歡迎【" + username + "】使用者登入成功！！！"); response.getWriter().println("</body>"); response.getWriter().println("</html>"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
編譯該類，並將產生的LoginServlet .class 檔案拷貝到WEB-INF目錄的classes檔案夾中
4.在web.xml中描述這個LoginServlet 類
<?xml version="1.0" encoding="ISO-8859-1"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <servlet><servlet-name>example</servlet-name><servlet-class>LoginServlet</servlet-class></servlet><servlet-mapping><servlet-name>example</servlet-name><url-pattern>/loginServlet</url-pattern></servlet-mapping></web-app>
html設計
<html><head><title>登入</title></head><body><form action="loginServlet" method="post">使用者：<input type="text" name="username"><br>密碼：<input type="password" name="password"><br><input type="submit" value="登入"></form></body></html>
至此一個簡單的servlet的web程式就寫好了，下面運行一下
啟動tomcat伺服器，輸入以下URL：http://localhost:8080/test_servlet/login.html
點擊登入
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