log4j在java中实现

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public class AccLogBase {

/**致命错误. */
public static final int LOG_LEVEL_FATAL = 1;

/** 错误. */
public static final int LOG_LEVEL_ERROR = 2;

/** 警告. */
public static final int LOG_LEVEL_WARN = 3;

/**信息. */
public static final int LOG_LEVEL_INFO = 4;

/** debug. */
public static final int LOG_LEVEL_DEBUG = 5;

/** 定义log基类 */
private static Logger log = null;

/**
* 获得log实例.
* @param cls 输出log日志class
*/
@SuppressWarnings("unchecked")
protected final void getLogInstance(final Class cls) {
  if (log == null) {
   log = Logger.getLogger(cls);
  }
}

/**
* 构造函数.
*/
public AccLogBase() {

//这里面将log4j.properties放到src路径下，如果是weblogic服务器，放到domain目录下

//或者通过 Properties prop = new Properties()；InputStream inputStream = new FileInputStream(“C:/log4j.properties”); //log4j.properties的绝对路径

//prop.load(inputStream); PropertyConfigurator.configure(prop);

PropertyConfigurator.configure("log4j.properties");
getLogInstance(this.getClass());
}

/**
* 输出log日志.
* @param className
* @param methodName
* @param level
* @param msg
*/
protected final void writeLog(final String className,final String msg, final String methodName,final Throwable exp,final int level) {

StringBuffer message = new StringBuffer();

message.append("[");
message.append(className);

message.append("#");
message.append(methodName);
message.append("]");

switch (level) {
   case LOG_LEVEL_FATAL:
    if (exp != null) {
     log.fatal(message.toString(), exp);
    } else {
     log.fatal(message.toString());
    }
    break;
   case LOG_LEVEL_ERROR:
    if (exp != null) {
     log.error(message.toString(), exp);
    } else {
     log.error(message.toString());
    }
    break;
   case LOG_LEVEL_WARN:
    if (exp != null) {
     log.warn(message.toString(), exp);
    } else {
     log.warn(message.toString());
    }
    break;
   case LOG_LEVEL_INFO:
    if (exp != null) {
     log.info(message.toString(), exp);
    } else {
     log.info(message.toString());
    }
    break;
   case LOG_LEVEL_DEBUG:
    if (exp != null) {
     log.debug(message.toString(), exp);
    } else {
     log.debug(message.toString());
    }
    break;
   default:
    break;
  }

}

public class TestLog extends AccLogBase {

/**
* 构造函数.
*/
public TestLog() {
}

private String className = this.getClass().getSimpleName();
private String methodName = "";

/**
* 测试日志输出.
*/
public final void testLog () {

methodName = new Throwable().getStackTrace()[0].getMethodName();

String message = “测试日志输出”;

//+ 処理開始，输出日志文件。
writeLog(className,message, methodName,"",4);

}

#######log4j.properties配置信息########

log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=./servers/AdminServer/logs/acc_servelet.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %m %n
log4j.rootLogger=DEBUG, file

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