【复习】servlet之hello world

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本文介绍了一个简单的Servlet示例，展示了如何创建一个名为SerlervtDemo的Servlet，并在web.xml中进行配置。该Servlet实现了初始化、业务逻辑处理及销毁等基本生命周期方法。

1，新建一个servlert demo

package com.servlert;

import java.io.IOException;
import java.io.PrintWriter;

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

public class SerlervtDemo extends HttpServlet{

private String message;
@Override
public void init() throws ServletException {
    //初始化
    super.init();
    message="hello world";
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    // 业务逻辑
    resp.setContentType("text/html");
    PrintWriter out=resp.getWriter();
    out.println(message);
}
@Override
public void destroy() {
    //
    super.destroy();
}

}

2,在web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>servlet_01_lifeCycle</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>
  <!--主要在这里配置 -->
  <servlet>
    <servlet-name>hello</servlet-name>
    <servlet-class>com.servlert.SerlervtDemo</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>/SerlervtDemo</url-pattern>
  </servlet-mapping>
</web-app>