JavaSevlet_Param

object요소에 의해 불러와지는 플러그인을 위한 매개변수를 정의

• name, value 두 속성 모두 반드시 존재해야 하며, 어떤 값도 가질 수 있음

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_3_1.xsd" id="WebApp_ID" version="3.1">

<display-name>17Init_param</display-name>

 

<context-param>

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

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

</context-param>

<context-param>

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

<param-value>ppp@naver.com</param-value>

</context-param>

 

<servlet>

<servlet-name>InitParamServlet</servlet-name>

<servlet-class>com.controller.InitParamServlet</servlet-class>

<init-param>

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

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

</init-param>

<init-param>

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

<param-value>aaa@naver.com</param-value>

</init-param>

</servlet>

 

<servlet>

<servlet-name>OtherServlet</servlet-name>

<servlet-class>com.controller.OtherServlet</servlet-class>

</servlet>

 

<servlet>

<servlet-name>ContextParamServlet</servlet-name>

<servlet-class>com.controller.ContextParamServlet</servlet-class>

<init-param>

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

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

</init-param>

<init-param>

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

<param-value>ccc@naver.com</param-value>

</init-param>

</servlet>

 

<servlet-mapping>

<servlet-name>InitParamServlet</servlet-name>

<url-pattern>/xxx</url-pattern>

</servlet-mapping>

 

<servlet-mapping>

<servlet-name>OtherServlet</servlet-name>

<url-pattern>/yyy</url-pattern>

</servlet-mapping>

 

<servlet-mapping>

<servlet-name>ContextParamServlet</servlet-name>

<url-pattern>/zzz</url-pattern>

</servlet-mapping>

 

<welcome-file-list>

<welcome-file>index.html</welcome-file>

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

<welcome-file>index.htm</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.jsp</welcome-file>

<welcome-file>default.htm</welcome-file>

</welcome-file-list>

</web-app>

 

INITParam

 

package com.controller;


import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/InitParamServlet")
public class InitParamServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
       
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("InitParamServlet.doGet");
//초기 파라미터 얻기
String userid = getInitParameter("userid");
String email = getInitParameter("email");
System.out.println(userid+"\t"+email);

//초기 파라미터 얻기
//Key값만 Enumeration으로 가져옴
Enumeration<String> enu = getInitParameterNames();
while(enu.hasMoreElements()) {
String key = enu.nextElement();
String value = getInitParameter(key);
System.out.println(key+"\t"+value);
}
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

 

ContextParam

 

package com.controller;


import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ContextServlet")
public class ContextParamServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
       
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("ContextParamServlet.doGet");
//web.xml에 ContextParam 설정
//context 파라미터 얻기
ServletContext ctx = getServletContext();
String userid = ctx.getInitParameter("userid");
String email = ctx.getInitParameter("email");
System.out.println(userid +"\t"+email);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

}