Servlet----httpservlet-优快云博客

本文深入解析了Java Servlet的基本实现，包括HHServlet、HiServlet和HelloServlet三个示例，展示了Servlet的初始化、服务和销毁过程，以及如何通过注解或XML配置映射URL。

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package com.lanou;

import javax.servlet.*;
import java.io.IOException;

public class HHServlet implements Servlet {
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {

    }

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

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {

    }

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

    @Override
    public void destroy() {

    }
}

package com.lanou;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
//系统提供的适配器模式下的抽象类
public class HiServlet extends GenericServlet {
    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {

    }
}

package com.lanou;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet(urlPatterns = "/Hello")
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("get请求");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("post请求");
    }
}

@WebServlet(urlPatterns = “/Hello”)注解相当于xml文件下的配置

<servlet>
        <servlet-name>Hello</servlet-name>
        <servlet-class>com.lanou.HelloServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>Hello</servlet-name>
        <url-pattern>/Hello</url-pattern>
    </servlet-mapping>