JavaSE商品购物流程设计

package com.log; import java.io.*; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Properties; public class LogUtils { public static String level = "error";//默认是error级别的 public static String logFile = null; static { try{ InputStream in = new BufferedInputStream(new FileInputStream("src/demo.properties")) ; Properties p = new Properties(); p.load(in); level = p.getProperty("level");//这里重置掉上面的级别 logFile = p.getProperty("logFile");//读取日志打印目录文件 }catch (IOException e){ e.printStackTrace(); } } public static void info(Exception e,String msg){ if(level.equals("info") || level.equals("debug") || level.equals("error")){ System.out.println("info msg = " + msg); log(e,msg); } } public static void debug(Exception e,String msg){ if(level.equals("debug") || level.equals("error")){ System.out.println("debug msg = " + msg); log(e,msg); } } public static void error(Exception e,String msg){ if(level.equals("error") || level.equals("info") || level.equals("debug")){ System.out.println("error msg = " + msg+" 异常：" + e.getMessage()); log(e,msg); } } /** * 记录日志 * @param ex 这个异常信息 * @param msg 自定义信息 */ private static void log(Exception ex,String msg){ try { StringBuilder sbr = new StringBuilder(); StackTraceElement[] trace = ex.getStackTrace(); for (StackTraceElement traceElement : trace) { sbr.append(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + "|at " + traceElement); } Throwable ourCause = ex.getCause(); if (ourCause != null) { sbr.append(trace); } sbr.append(ex.getMessage()); BufferedWriter bw = new BufferedWriter(new FileWriter(logFile)); bw.write(sbr.toString()+"\n"); bw.close(); }catch (IOException e){ e.printStackTrace(); } } }