java.util.logging使用示例

import java.io.IOException; import java.io.PrintWriter; import java.io.StringWriter; import java.text.SimpleDateFormat; import java.util.Date; import java.util.logging.FileHandler; import java.util.logging.Formatter; import java.util.logging.Level; import java.util.logging.LogRecord; import java.util.logging.Logger; public class LogTest { public static void main(String[] args) throws IOException { Logger log = Logger.getLogger(LogTest.class.getName()); log.setLevel(Level.INFO); FileHandler fileHandler = new FileHandler("E:/testlog%g.log", true); fileHandler.setLevel(Level.SEVERE); fileHandler.setFormatter(new Formatter() { public String format(LogRecord record) { SimpleDateFormat sd = new SimpleDateFormat("[yyyy-MM-dd HH:mm:ss]"); String d = sd.format(new Date()); return d + record.getLevel() + ":" + record.getMessage() + "/n"; } }); log.addHandler(fileHandler); try { throw new Exception("ldddddddd"); } catch (Exception e) { StringWriter sw = new StringWriter(); e.printStackTrace(new PrintWriter(sw)); log.severe(sw.toString()); } log.info("aaa"); } }