1 第一个Servlet_牛客博客

1、创建Java Web工程

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2、引入serverlet-api

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3、新建Servlet类

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package com.xianhuii.servlet;

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

public class MyFirstServlet implements Servlet {
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
        System.out.println("init");
    }

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

    @Override
    public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
        System.out.println("service");
        PrintWriter writer = response.getWriter();
        writer.println("Hello, Java Web!");
    }

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

    @Override
    public void destroy() {
        System.out.println("destroy");
    }
}

4、部署

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!-- 配置Servlet -->
    <servlet>
        <servlet-name>myFirstServlet</servlet-name>
        <servlet-class>com.xianhuii.servlet.MyFirstServlet</servlet-class>
    </servlet>
    <!-- 配置映射的URL -->
    <servlet-mapping>
        <servlet-name>myFirstServlet</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>
</web-app>

5、编写前端页面

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>$Title$</title>
</head>
<body>
    <a href="/hello">hello</a>
</body>
</html>

6、运行

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