logwriter.java

java版源代码,里面包含很多源代码,大家可以看看.

package com.trulytech.mantis.system;

import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.Hashtable;

/**
 * <p>Title: logWriter</p>
 * <p>Description: 日志处理</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: trulytech</p>
 * @author WangXian
 * @version 1.2
 */
public class logWriter {

//是否初始化
  public static boolean isInited = false;
//日志
  public static PrintWriter LogWriter = null;
//日期格式
  private static SimpleDateFormat Formatter = null;
//日期格式
  private static SimpleDateFormat DateFormatter = null;
//日志记录时间
  private static String LogDate = null;
  /**
   * 日志初始化
   * @throws Exception
   */

  protected static void init() throws Exception {
    if (isInited)
      return;
    try {
      Formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
      DateFormatter = new SimpleDateFormat("yyyyMMdd");

      if (Properties.logFileType.equalsIgnoreCase("multi")) {
        LogDate = DateFormatter.format(new java.sql.Timestamp(System.
            currentTimeMillis()));
        if (Properties.logType.equalsIgnoreCase("Append"))
          LogWriter = new PrintWriter(new BufferedWriter(new FileWriter(
              Properties.logFilePrefix + LogDate + ".log", true)), true);
        else
          LogWriter = new PrintWriter(new BufferedWriter(new FileWriter(
              Properties.logFilePrefix + LogDate + ".log", false)), true);

      }
      else {


          if (Properties.logType.equalsIgnoreCase("Append"))
            LogWriter = new PrintWriter(new BufferedWriter(new FileWriter(
                Properties.logFilePrefix + ".log", true)), true);
          else
            LogWriter = new PrintWriter(new BufferedWriter(new FileWriter(
                Properties.logFilePrefix + ".log", false)), true);



      }
       isInited = true;
    }
    catch (Exception e) {
      System.out.println("LogWriter initlizes failure!");
      throw e;
    }
  }

  /**
   *写日志
   *@param Level 等级
   *@param logInfo log信息
   */
  private static void log(int Level, String logInfo) {
    if (!isInited)
      return;
    try {
      //是否产生多个文件
      if (Properties.logFileType.equalsIgnoreCase("multi")) {
        //产生多个日志文件
        if (!LogDate.equalsIgnoreCase(DateFormatter.format(new java.sql.
            Timestamp(System.
                      currentTimeMillis())))) {
          ChangeLogFile();
        }
      }
      if (Level <= Properties.logLevel) {
        java.sql.Timestamp time = new java.sql.Timestamp(System.
            currentTimeMillis());
        if (Level == 1) {
          LogWriter.println("[错误信息 " + Formatter.format(time) + "] " + logInfo);

          if (Properties.ScreenLog)
            System.out.println("[错误信息 " + Formatter.format(time) + "] " +
                               logInfo);

        }
        else if (Level == 2) {
          LogWriter.println("[一般信息 " + Formatter.format(time) + "] " + logInfo);

          if (Properties.ScreenLog)
            System.out.println("[一般信息 " + Formatter.format(time) + "] " +
                               logInfo);

        }
        else {
          LogWriter.println("[详细信息 " + Formatter.format(time) + "] " + logInfo);

          if (Properties.ScreenLog)
            System.out.println("[详细信息 " + Formatter.format(time) + "] " +
                               logInfo);

        }
        time = null;
      }
      LogWriter.flush();
    }
    catch (Exception e) {
      System.out.println("Write LogFile Failure [" + e.toString() + "]");
    }
  }

  /**
   * 写一般信息
   * @param logInfo String
   */
  public static void Info(String logInfo) {
    log(2, logInfo);
  }

  /**
   * 写调试信息
   * @param logInfo String
   */
  public static void Debug(String logInfo) {
    log(3, logInfo);
  }

  /**
   * 写错误信息
   * @param logInfo String
   */
  public static void Error(String logInfo) {
    log(1, logInfo);
  }

  /**
   * 更换日志文件
   * @throws Exception
   */
  public synchronized static void ChangeLogFile() throws Exception {
    LogDate = DateFormatter.format(new java.sql.Timestamp(System.
        currentTimeMillis()));
    LogWriter.flush();
    LogWriter.close();
    if (Properties.logType.equalsIgnoreCase("Append"))
      LogWriter = new PrintWriter(new BufferedWriter(new FileWriter(
          Properties.logFilePrefix + LogDate + ".log", true)), true);
    else
      LogWriter = new PrintWriter(new BufferedWriter(new FileWriter(
          Properties.logFilePrefix + LogDate + ".log", false)), true);

  }
}