Servlet入门第一个例子

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Aservlet implements Servlet

第一步:创建web项目在src目录下创建com.servlet,创建AServlet类

package com.servlet;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 AServlet implements Servlet {    @Override    public void destroy() {        System.out.println("destroy");    }    @Override    public ServletConfig getServletConfig() {          System.out.println("ServletConfig.....");        return null;    }    @Override    public String getServletInfo() {       System.out.println("ServletInfo....");        return null;    }    @Override    public void init(ServletConfig config) throws ServletException {       System.out.println("init....");    }    @Override    public void service(ServletRequest req, ServletResponse res)            throws ServletException, IOException {        System.out.println("service....");    }}

第二步:修改web.xml文件代码如下

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <display-name>servlet</display-name>  <servlet>  <servlet-name>Aservlet</servlet-name>  <servlet-class>com.servlet.AServlet</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>Aservlet</servlet-name>  <!-- /必须加上,后面的项目名可以随便起-->  <url-pattern>/AServlet</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

第三步:项目运行http://localhost:8080/AServlet

第二个例子表单提交到servlet

第一步:在web项目src的com.servlet包下创建servlet

package com.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CServlet extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html");        System.out.println("doGet()....");    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {          response.setContentType("text/html");        System.out.println("doPost()....");    }}

第二步:servlet配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <display-name>servlet</display-name>  <servlet>  <servlet-name>Aservlet</servlet-name>  <servlet-class>com.servlet.AServlet</servlet-class>  <!-- servletconfig -->  <init-param>     <param-name>p1</param-name>     <param-value>v1</param-value>  </init-param>  <init-param>     <param-name>p2</param-name>     <param-value>v2</param-value>  </init-param>  </servlet>  <servlet>    <servlet-name>CServlet</servlet-name>    <servlet-class>com.servlet.CServlet</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>Aservlet</servlet-name>  <url-pattern>/AServlet</url-pattern>  </servlet-mapping>  <servlet-mapping>    <servlet-name>CServlet</servlet-name>    <url-pattern>/CServlet</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

第三步:login.html代码如下

<!DOCTYPE html><html>  <head>    <title>servlet</title>    <meta charset="UTF-8">  </head>  <body>  <!-- action="/项目名/servletname" -->   <form action="/servlet/CServlet" method="post">   <!--设默认值为张三-->   <input type="text"  value="张三"><br>   <input type="submit"  vlaue="提交">   </form>  </body></html>

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