在log4J輸出中跳過並重復的行號

Question

我已經設置了log4j，但是我注意到這樣的奇怪輸出（我希望看到0 1 2 3 4是行號）-

0    [main] DEBUG org.dnsdojo.ryanhost.GA.MuPlusOne.Genome  - 0011110101101010110110111011101111110001010001110011100011110111011001011100100100101001100110100000011100010100
2    [main] DEBUG org.dnsdojo.ryanhost.GA.MuPlusOne.Genome  - 112
2    [main] DEBUG org.dnsdojo.ryanhost.GA.MuPlusOne.Genome  - 0010100111111010110110010001000100000110110111111011011100101010011100011001111111111011110011001111010100100101
3    [main] DEBUG org.dnsdojo.ryanhost.GA.MuPlusOne.Genome  - 112
3    [main] DEBUG org.dnsdojo.ryanhost.GA.MuPlusOne.Genome  - 0101101000001010000001101000101001001000111111111110001010011001111011010101011010010000111000100011110010101100
3    [main] DEBUG org.dnsdojo.ryanhost.GA.MuPlusOne.Genome  - 112

誰能解釋為什么會這樣？ log4j.properties＃定義控制台附加程序log4j.appender.consoleAppender = org.apache.log4j.ConsoleAppender

# now define the layout for the appender
log4j.appender.consoleAppender.layout = org.apache.log4j.PatternLayout
log4j.appender.consoleAppender.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

# now map our console appender as a root logger, means all log messages will go to this appender
log4j.rootLogger = DEBUG, consoleAppender

基因組類別

package org.dnsdojo.ryanhost.GA.MuPlusOne;

import java.util.Random;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;


public class Genome
{
private static Logger logger = Logger.getLogger(Genome.class);
byte[] genome;
Random rng = new Random();
String genomeString = "";

public Genome ( int stringLength, int motorSet )
{
    PropertyConfigurator.configure("log4j.properties");
    genome = new byte[ stringLength * 7 * motorSet]; // stringLength depends on how many bytes you wish to have. For the arpibot this is dependant on the number of sensor readings taken
    for (int i = 0; i < genome.length; i++)
    {
        genome[i] = (byte)rng.nextInt(2);
        genomeString += genome[i];
    }
    logger.debug(genomeString);
    logger.debug(genomeString.length());
}

public byte[] getGenome()
{
    return genome;
}

public byte[] mutate (float mutationStep)
{
    return genome;                                  //placeholder
}

}

駕駛員等級

package org.dnsdojo.ryanhost.GA.MuPlusOne;

import java.util.ArrayList;
public class Driver 
{
int populationSize = 0; //mu
int evaluationTime = 0; //tau measured in seconds
double reevaluationRate, mutationStep = 0;//rho = reevaluationRate, sigma = mutationStep
int numberOfSensors, numberOfMotors = 0;

ArrayList<Genome> population = new ArrayList<Genome>();

public Driver (int populationSize, int evaluationTime, double reevaluationRate, double mutationStep, int numberOfSensors, int numberOfMotors)
{
    this.populationSize = populationSize;
    this.evaluationTime = evaluationTime;
    this.reevaluationRate = reevaluationRate;
    this.mutationStep = mutationStep;
    this.numberOfSensors = numberOfSensors;
    this.numberOfMotors = numberOfMotors;

    for(int i = 0; i < populationSize; i++)
    {
        population.add (new Genome (numberOfSensors , numberOfMotors) );
    }
}

public static void main( String[] args)
{
    Driver gADriver = new Driver(100, 60 , 0.2, 0.2, 8, 2);
}

}

Answer 1

此Javadoc頁面針對模式%-4r聲明以下%-4r

r-用於輸出從布局的構造到創建日志記錄事件所經過的毫秒數。

%-4表示使用4個空格（填充）寫入r所需的信息。 因此，我猜測您的日志會如此之快，以至於它們之間只有1-2毫秒的間隔（日志語句中的第一個數字）。 當您實際開始記錄事物時，我們還可以推斷出Pattern布局是惰性構造的。

Answer 2

這與記錄器無關（我使用log4j已經15年了）。 它似乎完全記錄了發送給它的字符串。 再次查看代碼，並與預期的結果進行比較。 nextInt(2)的Random生成器正在尋找0-1的值...因此，記錄了0和1的字符串。

for (int i = 0; i < genome.length; i++)
{
    genome[i] = (byte)rng.nextInt(2);
    genomeString += genome[i];
}
logger.debug(genomeString);
logger.debug(genomeString.length());