Servlet通用写法

最新推荐文章于 2024-08-16 11:28:57 发布

mqingo

最新推荐文章于 2024-08-16 11:28:57 发布

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分类专栏： Servlet 文章标签： Servlet

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本文介绍了Servlet的通用写法，重点讲解了如何创建一个继承自HttpServlet的类，并复写doGet和doPost方法。同时，提到了在web.xml中的配置方式，以实现对HTTP请求的处理。通过这种方式，可以更高效地管理Servlet的生命周期。

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###Servlet的通用写法

Servlet (接口)
           |
           |
       GenericServlet
           |
           |
       HttpServlet （用于处理http的请求）

定义一个类，继承HttpServlet 复写doGet 和 doPost

HttpServlet02:

package com.yuming.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet02 extends HttpServlet{
	
	@Override
	protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.service(arg0, arg1);
		System.out.println("HelloServlet02  service方法");
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doGet(req, resp);
		System.out.println("Get 方法............");
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doPost(req, resp);
		System.out.println("POST 方法------------------");
	}

}

不过,以后不用service方法:

HttpServlet02:

package com.yuming.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet02 extends HttpServlet{
	
	/*@Override
	protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.service(arg0, arg1);
		System.out.println("HelloServlet02  service方法");
	}*/
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doGet(req, resp);
		System.out.println("Get 方法............");
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doPost(req, resp);
		System.out.println("POST 方法------------------");
	}

}

web.xml:

<?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>helloweb</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>
  
   <!-- 向tomcat报告， 我这个应用里面有这个servlet， 名字叫做HelloServlet , 具体的路径是com.yuming.servlet.HelloServlet -->
  <servlet>
  <servlet-name>HelloServlet</servlet-name>
  <servlet-class>com.yuming.servlet.HelloServlet</servlet-class>
  </servlet>
  
  <!-- 注册servlet的映射。  servletName : 找到上面注册的具体servlet，  url-pattern: 在地址栏上的path 一定要以/打头 -->
  <servlet-mapping>
  <servlet-name>HelloServlet</servlet-name>
  <url-pattern>/HelloServlet</url-pattern>
  </servlet-mapping>
  
  <servlet>
  <servlet-name>HelloServlet02</servlet-name>
  <servlet-class>com.yuming.servlet.HelloServlet02</servlet-class>
  </servlet>
  
  <servlet-mapping>
  <servlet-name>HelloServlet02</servlet-name>
  <url-pattern>/HelloServlet02</url-pattern>
  </servlet-mapping>
  
</web-app>

运行结果: