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템플릿 메소드 패턴 - 스프링의 DispatcherServlet
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| package org.antop.billiardslove; | |
| import javax.servlet.http.HttpServletRequest; | |
| import javax.servlet.http.HttpServletResponse; | |
| public class DispatcherServlet extends FrameworkServlet { | |
| @Override | |
| protected void doService(HttpServletRequest request, HttpServletResponse response) throws Exception { | |
| // implements | |
| } | |
| } |
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| import org.springframework.web.util.NestedServletException; | |
| import javax.servlet.ServletException; | |
| import javax.servlet.http.HttpServletRequest; | |
| import javax.servlet.http.HttpServletResponse; | |
| import java.io.IOException; | |
| public abstract class FrameworkServlet extends HttpServlet { | |
| // HttpServlet.doGet 메소드(후크)를 오버라이드 | |
| @Override | |
| protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { | |
| processRequest(request, response); | |
| } | |
| // 템플릿 메소드 | |
| protected final void processRequest(HttpServletRequest request, HttpServletResponse response) | |
| throws ServletException, IOException { | |
| try { | |
| doService(request, response); | |
| } catch (ServletException | IOException ex) { | |
| throw ex; | |
| } catch (Throwable ex) { | |
| throw new NestedServletException("Request processing failed", ex); | |
| } | |
| } | |
| // 하위 클래스가 구현해야 하는 추상 메소드 | |
| protected abstract void doService(HttpServletRequest request, HttpServletResponse response) | |
| throws Exception; | |
| } |
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| import javax.servlet.ServletException; | |
| import javax.servlet.http.HttpServletRequest; | |
| import javax.servlet.http.HttpServletResponse; | |
| import java.io.IOException; | |
| import java.util.ResourceBundle; | |
| public abstract class HttpServlet { | |
| private static final String LSTRING_FILE = "javax.servlet.http.LocalStrings"; | |
| private static final ResourceBundle lStrings = ResourceBundle.getBundle(LSTRING_FILE); | |
| // 후크 메소드 (FrameworkServlet가 오버라이드 함) | |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) | |
| throws ServletException, IOException { | |
| String msg = lStrings.getString("http.method_get_not_supported"); | |
| sendMethodNotAllowed(req, resp, msg); | |
| } | |
| // 후크 메소드 (FrameworkServlet가 오버라이드 함) | |
| protected void doPost(HttpServletRequest req, HttpServletResponse resp) | |
| throws ServletException, IOException { | |
| // 위와 같음 | |
| } | |
| // 다른 후크 메소드 | |
| // doHead() | |
| // doDelete() | |
| // doPut() | |
| private void sendMethodNotAllowed(HttpServletRequest req, HttpServletResponse resp, String msg) throws IOException { | |
| // 에러를 응답한다. | |
| } | |
| } |
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