java.util.logging.Logger基础

import java.io.IOException;  
import java.io.PrintWriter;  
import java.io.StringWriter;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.logging.ConsoleHandler;
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 TestLogger { 
     public static void main(String[] args) throws IOException{  
            Logger log = Logger.getLogger(TestLogger.class.getName());   
            //设置在Console中的输出  
            ConsoleHandler consoleHandler =new ConsoleHandler(); 
            consoleHandler.setLevel(Level.ALL); 
            log.addHandler(consoleHandler); 
            
            //设置输出到文件中
            FileHandler fileHandler = new FileHandler("testlog.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();  
                                        }  
                                     });  
            log.addHandler(fileHandler);  
            try {  
                throw new Exception("bbb");  
            }  
            catch (Exception e) {  
                StringWriter sw = new StringWriter();  
                e.printStackTrace(new PrintWriter(sw));  
                log.severe(sw.toString());  
            }  
            log.info("aaa");  
        }  
}

catch (Exception e) {  
                StringWriter sw = new StringWriter();  
                e.printStackTrace(new PrintWriter(sw));  
                log.severe(sw.toString());  
            }