Write log in Json format using log4j
import java.io.File; import java.io.IOException; import java.net.InetAddress; import java.net.UnknownHostException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.Enumeration; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.TimeZone; import java.util.regex.Pattern; import org.apache.log4j.Appender; import org.apache.log4j.Category; import org.apache.log4j.FileAppender; import org.apache.log4j.Layout; import org.apache.log4j.helpers.LogLog; import org.apache.log4j.spi.AppenderAttachable; import org.apache.log4j.spi.LoggingEvent; import org.apache.log4j.spi.ThrowableInformation; public class JsonLayout extends Layout { private static final Pattern SEP_PATTERN = Pattern.compile("(?:\\p{Space}*?[,;]\\p{Space}*)+"); private static final Pattern PAIR_SEP_PATTERN = Pattern.compile("(?:\\p{Space}*?[:=]\\p{Space}*)+"...