자바 Config 파일 읽는 클래스

프로그래밍/Java 2023. 1. 26. 21:56

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

public class ConfigProperties {
private final Properties configProp = new Properties();
private static ConfigProperties instance = null;

// private constructor
    private ConfigProperties() {
    }

    public static ConfigProperties getInstance() {
     if (instance == null) {

     for (Map.Entry entry: System.getenv().entrySet())
     {
           System.out.println( entry.getKey() + "=" + entry.getValue() );

     }

     String PATH = System.getenv("...");

            instance = new ConfigProperties(PATH);
        }
    return instance;
}
private ConfigProperties(String PATH)
{
      //Private constructor to restrict new instances
  // InputStream in = this.getClass().getClassLoader().getResourceAsStream(PATH);

InputStream in = null;
   try {
   File file = new File(PATH);
   in =  new FileInputStream(file);
   configProp.load(in);
   } catch (IOException e) {
   e.printStackTrace();
   }finally {
   try {
   if (in!=null) in.close();
   }catch(Exception e) {

   }
   }
}

public String getProperty(String key)
{
return configProp.getProperty(key);
}

public Set<String> getAllPropertyNames(){
return configProp.stringPropertyNames();
}

public boolean containsKey(String key){
return configProp.containsKey(key);
}

public void setProperty(String key, String value)
{
configProp.setProperty(key, value);
}
}