PropertyPlaceholderConfigurer를 이용한 properties 파일 로드 예

properties파일에 프로그램의 설정내용을 저장하고 클래스패스에 저장해 두면 PropertyPlaceholderConfigurer를 이용하여 로드할 수 있고 다른  빈에서 그 속성들을 사용할 수가 있다.

/src/config/jdbc.properties

jdbc.driver=oracle.jdbc.OracleDriver
jdbc.url=jdbc:oracle:thin:@localhost:1521:XE
jdbc.username=scott
jdbc.password=tiger

src/applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:p="http://www.springframework.org/schema/p"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

 ..............  
  
 <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="location">
   <value>classpath:config/jdbc.properties</value>
  </property>
 </bean>
 
 <bean id="configTest" class="test.ConfigTest">
  <property name="driverClass" value="${jdbc.driver}"/>
  <property name="url" value="${jdbc.url}"/>
  <property name="username" value="${jdbc.username}"/>
  <property name="password" value="${jdbc.password}"/>
 </bean>
</beans>

test.ConfigTest.java

package test;

public class ConfigTest {
 
 private String driverClass;
 private String url;
 private String username;
 private String password;
 
 public String getDriverClass() {
  return driverClass;
 }
 public String getUrl() {
  return url;
 }
 public String getUsername() {
  return username;
 }
 public String getPassword() {
  return password;
 }
 public void setDriverClass(String driverClass) {
  this.driverClass = driverClass;
 }
 public void setUrl(String url) {
  this.url = url;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public void setPassword(String password) {
  this.password = password;
 }
}

test.Main.java

package test;
import java.util.ArrayList;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

import gugu.*;
import util.*;

public class Main {
 
 public static void main(String[] args){

 ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
 ConfigTest config = (ConfigTest) context.getBean("configTest");
 System.out.println(config.getDriverClass());
 System.out.println(config.getUrl());
 System.out.println(config.getUsername());
 System.out.println(config.getPassword());
 }
}