由外部讀取 properties 檔案的範例

這是之前朋友問我的問題，給自己備忘一下

package com.acs.test;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class readProperties {

  public static void main(String[] args) {
    // 由程式的class path 讀取properties 檔案 (ex.art.properties)
    ClassLoader classLoader = ClassLoader.getSystemClassLoader();
    InputStream is = classLoader.getResourceAsStream("art.properties");

    Properties theProperties = new Properties();
    try {
      theProperties.load(is);
      System.out.println(theProperties.getProperty("foo"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
  }
}