Servlet其实就是一个运行在web服务器上的Java程序,用于处理从web客户端发送的请求,并且对请求作出响应。
package com.itheima.servlet.demo1; import java.io.IOException; import javax.servlet.Servlet; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; public class HelloServlet implements Servlet{ @Override public void destroy() { // TODO Auto-generated method stub } @Override public ServletConfig getServletConfig() { // TODO Auto-generated method stub return null; } @Override public String getServletInfo() { // TODO Auto-generated method stub return null; } @Override public void init(ServletConfig arg0) throws ServletException { // TODO Auto-generated method stub } @Override public void service(ServletRequest req, ServletResponse resp) throws ServletException, IOException { // T在页面上输出 resp.getWriter().println("HelloServlet..."); } }
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>web_test</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <!-- 配置servlet --> <servlet> <!-- 配置servlet的名称 --> <servlet-name>helloServlet</servlet-name> <!-- 配置servlet的全路径 --> <servlet-class>com.itheima.servlet.demo1.HelloServlet</servlet-class> </servlet> <!-- 配置servlet的映射 --> <servlet-mapping> <!-- 配置servlet的名称 --> <servlet-name>helloServlet</servlet-name> <!-- 配置访问路径 --> <url-pattern>/hello</url-pattern> </servlet-mapping> </web-app>