HelloServlet

作者: 了春风 | 来源:发表于2021-01-30 13:10 被阅读0次

HelloServlet
JavaWeb之Servlet
Servlet的生命周期和加载
002.Nginx反向代理案例以及tomcat-redis-se
servlet入门
servlet的xml配置
servlet的注解配置
创建第一个Servlet程序
【Java WEB开发】-002 手动创建一个Servlet
Java Web基础教程（四）Servlet技术

1、通过Maven创建web项目！

Snipaste_2021-01-30_12-32-06.png

2、输入项目名

Snipaste_2021-01-30_12-35-13.png

3、配置Maven

Snipaste_2021-01-30_12-39-37.png

4、创建文件夹

Snipaste_2021-01-30_12-37-26.png

5、导入Maven依赖

<!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>javax.servlet.jsp-api</artifactId>
    <version>2.3.3</version>
</dependency>

<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
</dependency>

6、在Java中创建Servlet的实现类：

package com.why.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //响应的类型：html
        resp.setContentType("text/html");
        //获取响应的输出流
        PrintWriter out = resp.getWriter();
        out.println("<html>");
        out.println("<head>");
        out.println("<title>我是导航栏</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Hello Servlet!</h1>");
        out.println("</body>");
        out.println("</html>");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

7、配置web.xml文件

<?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"
         metadata-complete="true">
<!--  web.xml中是配置我们web的核心应用-->
<!--  注册Servlet-->
  <servlet>
    <servlet-name>helloServlet</servlet-name>
    <servlet-class>com.why.servlet.HelloServlet</servlet-class>
  </servlet>
<!--  一个Servlet对应一个Mapping：映射-->
  <servlet-mapping>
    <servlet-name>helloServlet</servlet-name>
<!--    请求路径-->
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>
</web-app>

8、配置Tomcat