Servlet笔记

Posted 2020-10-21 jepson6669

1 Servlet的快速入门

1 web.xml配置文件

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>WEBTest13</display-name>
  
  <servlet>
      <servlet-name>myservlet</servlet-name>
      <servlet-class>p1.servlet.MyFirstServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>myservlet</servlet-name>
      <url-pattern>/fist</url-pattern>
  </servlet-mapping>
  
  <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>
</web-app>

2 servlet代码

package p1.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;
import javax.servlet.http.HttpServletResponse;

/*
 * 1 创建类实现servlet接口
 * 2 添加里面没有实现的方法，并重写service方法
 * 3 配置web.xml文件。
 */
public class MyFirstServlet implements Servlet{

    /**
     * 重写service方法
  */
    @Override
    public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
    
        HttpServletResponse response = (HttpServletResponse) res;
        res.getWriter().write("this is my first servlet");
    }

    @Override
    public void init(ServletConfig config) throws ServletException {
    }

    @Override
    public ServletConfig getServletConfig() {
        
        return null;
    }

    
    @Override
    public String getServletInfo() {
        
        return null;
    }

    @Override
    public void destroy() {
    }

    
}