Servlet의 LifeCycle

초기화 정보 얻기

- init() 메소드에서 서블릿 개체 초기화

- 초기화 정보의 위치

-> web.xml

<servlet>

<servlet-name>~</servlet-name>

<servlet-class>~</servlet-class>

<init-param>

<param-name>name</param-name>

<param-value>value</param-value>

- String getInitParameter(String name)

=================================================================================================================

(InitParameterServlet)

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class InitParameterServlet extends HttpServlet{

@Override

public void init(ServletConfig config) throws ServletException {

// TODO Auto-generated method stub

super.init(config);

}

@Override

protected void service(HttpServletRequest req, HttpServletResponse res)

throws ServletException, IOException {

// TODO Auto-generated method stub

PrintWriter out = res.getWriter();

out.println("초기 파라미터들....");

Enumeration enumer = getInitParameterNames();

while(enumer.hasMoreElements()){

String name = (String)enumer.nextElement();

out.println(name + " ---> " + getInitParameter(name));

}

}

}

(web.xml)

<servlet>

      <servlet-name>InitParameterServlet</servlet-name>

      <servlet-class>InitParameterServlet</servlet-class>

      <init-param>

          <param-name>tomcat ver</param-name>

          <param-value>7.0.0</param-value>

      </init-param>

  </servlet>

  

  <servlet-mapping>

      <servlet-name>InitParameterServlet</servlet-name>

      <url-pattern>/InitParameterServlet</url-pattern>

  </servlet-mapping>

================================================================================================================

요청 정보 얻기

- HttpServletRequest 개체

-> String getParameter(String name)

-> String[] getParameterValues(String name)

-> String getHeader(String name)

-> String getRemoteAddr()

-> void setCharacterEncoding(String env)

응답 생성

- HttpServletResponse 개체

-> void setContentType(String type)

-> void addHeader(String name, String value)

-> PrintWriter getWriter()

-> ServletOutputStream getOutputStream()