[21.09.13] HelloServlet - init() / doGet() / destroy()
////////HelloServlet
package com.hello;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//@WebServlet("/HelloServlet")
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
public void init(ServletConfig config) throws ServletException {
System.out.println("실행하자마자 제일 먼저 호출되는 함수 - init()");
} // Servlet은 브라우저 결과를 찾을 때 init을 가장 먼저 찾는다
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("클라이언트 요청이 있을 때마다 호출하는 함수 - service()");
response.setContentType("text/html"); // 이제부터 쓰는 모든 문서를 html로 인식해라
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("</head>");
out.println("<body>");
out.println("Hello Servlet!!");
out.println("</body>");
out.println("</html>");
}
@Override
public void destroy() {
System.out.println("서블릿 종료될 때 호출된다 - destroy()");
}
}
////////web.xml
<?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_4_0.xsd"
id="WebApp_ID" version="4.0">
<display-name>helloServlet</display-name>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.hello.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
<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>
</web-app>