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loggingExample.java
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package example.LoggingExample;
import java.util.logging.*;
import example.EnumExample.ColorLogging;
/**
* SEVERE, WARNING, INFO, CONFIG, FINE, FINER, FINEST.
* 開發軟體時候，盡可能使用logging去取代 "system.out.print"，確保logging顯示分隔不同level。
*
* Reference:
* - https://www.liaoxuefeng.com/wiki/1252599548343744/1264738568571776
*/
public class loggingExample {
public static void main(String[] args) {
// ! 想一想使用 logging, color 和 exception 結合
// 可以參考 ExceptionExample.colorLoggingExample
// ! 思考 logging 日誌跟 system.out.println 差別
// ! 思考 logging 日誌、DB、Exception之間的關係
// Logger logger = Logger.getGlobal();
Logger logger = Logger.getLogger("loggingTest");
logger.setLevel(Level.ALL); // Leavel.OFF
/**
* Logger 預設的 Handler 是 ConsolerHandler。 - 一個 Logger 可以維護多個 Handler，每個 Handler
* 可以有自己的訊息等級。
*/
ConsoleHandler consoleHandler = new ConsoleHandler();
consoleHandler.setLevel(Level.SEVERE);
logger.addHandler(consoleHandler);
logger.severe(Color.ANSI_RED + " 嚴重資訊..." + Color.ANSI_RESET);
logger.warning(Color.ANSI_YELLOW + "警示資訊..." + Color.ANSI_RESET);
logger.info(Color.ANSI_CYAN + "一般資訊..." + Color.ANSI_RESET);
logger.config(Color.ANSI_BLUE + "設定方面資訊..." + Color.ANSI_RESET);
logger.fine("細微的資訊...");
logger.finer("更細微的資訊...");
logger.finest("最細微的資訊...");
logger.log(Level.SEVERE, "嚴重資訊");
logger.log(Level.WARNING, "警示資訊");
logger.log(Level.INFO, "一般資訊");
logger.log(Level.CONFIG, "設定方面資訊");
logger.log(Level.FINE, "細微的資訊");
logger.log(Level.FINER, "更細微的資訊");
logger.log(Level.FINEST, "最細微的資訊");
// enum.
System.out.println("High: " + ColorLogging.HIGH);
System.out.println("MEDIUM: " + ColorLogging.MEDIUM);
System.out.println("LOW: " + ColorLogging.LOW);
}
}
class Color {
public static final String ANSI_RESET = "\u001B[0m";
public static final String ANSI_RED = "\u001B[31m";
public static final String ANSI_WHITE = "\u001B[37m";
public static final String ANSI_YELLOW = "\u001B[33m";
public static final String ANSI_GREEN = "\u001B[32m";
public static final String ANSI_PURPLE = "\u001B[35m";
public static final String ANSI_BLUE = "\u001B[34m"; // 深藍色
public static final String ANSI_CYAN = "\u001B[36m"; // 淡藍色
}