1 제목 #

2 발문 #

3 필자 소개 #

4 본문 #

4.1 서론, 어떻게 공부할 것인가 #

4.2 본론 #

4.2.1 web.xml #

<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>
        org.apache.struts.action.ActionServlet
    </servlet-class>
    <init-param>
        <param-name>config</param-name>
        <param-value>
         /WEB-INF/struts-config.xml
        </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<security-constraint>
  <web-resource-collection>
    <web-resource-name>retail</web-resource-name>
    <url-pattern>/acme/retail/*</url-pattern>
    <http-method>GET</http-method>
    <http-method>POST</http-method>
  </web-resource-collection>
  <auth-constraint>
    <role-name>CONTRACTOR</role-name>
    <role-name>HOMEOWNER</role-name>
  </auth-constraint>
</security-constraint>

4.2.2 예외 처리 #

<error-page>
  <exception-type>java.lang.Exception</exception-type>
  <location>/common/error.jsp</location>
</error-page>

<error-page>
  <error-code>404</error-code>
  <location>/common/error.jsp</location>
</error-page>

4.2.3 로깅 #

package com.hangame.avatar;

import ...

public class Avatar {
    private static Log log = LogFactory.getLog(Avatar.class);

    public void changeBackgroud() {
        log.debug("avatar changing..");
    }
}

<?xml version="1.0" encoding="UTF-8" ?>

<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
  <appender name="normal" class="org.apache.log4j.ConsoleAppender">
    <param name="Threshold" value="DEBUG"/>
    <layout class="org.apache.log4j.PatternLayout">
     <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} [%-5p] %m%n"/>
    </layout>
  </appender>
  <appender name="memory" class="com.nhn.logging.MemoryAppender" >
    <param name="Threshold" value="ERROR"/>
     <layout class="org.apache.log4j.PatternLayout">
     <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} [%-5p](%F:%L) %m%n"/>
     </layout>
  </appender>

  <logger name="com.hangame" additivity="false">
    <level value="DEBUG"/>
    <appender-ref ref="normal"/>
    <appender-ref ref="memory"/>
  </logger>
  <logger name="org.apache" additivity="false">
    <level value="INFO"/>
    <appender-ref ref="normal"/>
  </logger>

  <root>
    <level value="WARN"/>
    <appender-ref ref="STDOUT"/>
  </root>
</log4j:configuration>

4.2.4 예외 추적 #

    if ("Y".equals(param)) doSomthing();
    else doOther();

4.2.5 한글 문제 #

  <meta http-equiv="Content-Type" content="text/html;charset=euc-kr" />

4.2.6 URL 인코드 #

4.2.7 클래스패스의 리소스 사용법 #

    public File getFile(String name) {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        return new File(loader.getResource(name).getFile());
    }

    public void doSomeProcess() {
        File file = getFile("config.xml");
    }

4.2.8 서블릿/액션 멤버 변수 공유 문제 #

public class BadServlet extends HttpServlet {

    Map userInfo;

    protected void service(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException {

        String username = req.getParameter("name");
        Map userInfo = UserManager.getUserInfo(username);
        req.setAttribute("userInfo", username);
    }
}

4.3 결론, 생각하기 #