WEB.XML에서 서블릿 맵핑 하는법
web.xml에 </welcome-file-list> 가 끝난 구문뒤에 아래 코드를 붙여주면 된다.
<?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>HelloWorld</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>
<servlet>
<servlet-name>helloworld</servlet-name>
<servlet-class>com.javalec.ex.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>helloworld</servlet-name>
<url-pattern>/hw</url-pattern>
</servlet-mapping>
</web-app>servlet-name : 임의의 이름을 만들어 준다.
servlet-class : 매핑할 클래스 파일명을 패키지명을 포함하여 정확하게 입력한다.
url-pattern : servlet-class의 클래스를 매핑할 임의의 이름을 입력합니다. 주의할 점은 '/' 로 시작해야한다.
Servlet Project 분석?
package com.javalec.ex;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class HelloWorld
*/
@WebServlet("/HWorld")
public class HelloWorld extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloWorld() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("헬로월드");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
Servlet프로젝트는 httpServlet클래스를 상속 받는다.
(HttpServletRequest request, HttpServletResponse response) 메서드에서 (HttpServletRequest request 는 요청처리객체이며, HttpServletResponse response 응답처리 객체이다.
Get 방식 : URL값으로 정보가 전송되어 보안에 약함
Post 방식 : header를 이용해 정보가 전송되어 보안에 강화
Get 과 Post방식을 정하는것은 HTML 안에 Form태그 method 속성값으로 정한다.
Get방식 예제 ?
package com.javalec.ex;
import java.io.IOException;
import java.io.PrintWriter;
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 sun.print.PrinterJobWrapper;
/**
* Servlet implementation class HelloWorld
*/
@WebServlet("/HWorld")
public class HelloWorld extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloWorld() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
response.setContentType("text/html");
out.println("<html>");
out.println("<head>");
out.println("</head>");
out.println("<body>");
out.println("Helloworld~~");
out.println("</body>");
out.println("</html>");
out.close();
System.out.println("doGet");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("doPost");
}
}
공부하며 예제풀이 정리