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2010-06-01T05:01:15Z

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в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Comparing Log Levels: To compare the severity of two logging levels, use Level.intValue(). ==



<source lang="java">
import java.util.logging.Level;
public class Main {
public static void main(String[] argv) throws Exception {
Level level1 = Level.INFO;
Level level2 = Level.CONFIG;
if (level1.intValue() > level2.intValue()) {
System.out.println("level1 is more severe");
} else if (level1.intValue() < level2.intValue()) {
System.out.println("level2 is more severe");
} else {
System.out.println("level1 == level2");
}
}
}</source>



== Creating a Custom Log Level ==



<source lang="java">
import java.util.logging.Level;
import java.util.logging.Logger;
class MyLevel extends Level {
public static final Level DISASTER = new MyLevel("DISASTER", Level.SEVERE.intValue() + 1);
public MyLevel(String name, int value) {
super(name, value);
}
}
public class Main {
public static void main(String[] argv) throws Exception {
Logger logger = Logger.getLogger("com.mycompany");
logger.log(MyLevel.DISASTER, "my disaster message");
Level disaster = Level.parse("DISASTER");
logger.log(disaster, "my disaster message");
}
}</source>



== Determining If a Message Will Be Logged ==



<source lang="java">
import java.util.logging.Level;
import java.util.logging.Logger;
public class Main {
public static void main(String[] argv) throws Exception {
Logger logger = Logger.getLogger("com.mycompany.MyClass");
// Check if the message will be logged
if (logger.isLoggable(Level.FINEST)) {
logger.finest("my finest message");
}
}
}</source>



== Getting the Log Level of a Logger ==



<source lang="java">
import java.util.logging.Level;
import java.util.logging.Logger;
public class Main {
public static void main(String[] argv) throws Exception {
}
// Return the level of the specified logger.
public static Level getLevel(Logger logger) {
Level level = logger.getLevel();
while (level == null && logger.getParent() != null) {
logger = logger.getParent();
level = logger.getLevel();
}
return level;
}
}</source>



== Log finest, finer, config, warning ans severe ==



<source lang="java">
import java.util.logging.Logger;
public class Logging {
public static void main(String[] args) {
Logger log = Logger.getLogger("global");
log.finest("A");
log.finer("B");
log.fine("C");
log.config("D");
log.info("E");
log.warning("O");
log.severe("A");
}
}</source>



== Setting the Log Level of a Logger ==



<source lang="java">
import java.util.logging.Level;
import java.util.logging.Logger;
public class Main {
public static void main(String[] argv) throws Exception {
// Get a logger
Logger logger = Logger.getLogger("com.mycompany");
// Set the level to a particular level
logger.setLevel(Level.INFO);
// Set the level to that of its parent
logger.setLevel(null);
// Turn off all logging
logger.setLevel(Level.OFF);
// Turn on all logging
logger.setLevel(Level.ALL);
}
}</source>



== Use different logging level ==



<source lang="java">
import java.util.logging.Level;
import java.util.logging.Logger;
public class MainClass {
private static Logger
lgr = Logger.getLogger("com"),
lgr2 = Logger.getLogger("com.jexp"),
util = Logger.getLogger("com.jexp.util"),
test = Logger.getLogger("com.jexp.test"),
rand = Logger.getLogger("random");

private static void logMessages() {
lgr.info("com : info");
lgr2.info("com.bruceeckel : info");
util.info("util : info");
test.severe("test : severe");
rand.info("random : info");
}
public static void main(String[] args) {
lgr.setLevel(Level.SEVERE);
System.out.println("com level: SEVERE");
logMessages();
util.setLevel(Level.FINEST);
test.setLevel(Level.FINEST);
rand.setLevel(Level.FINEST);
System.out.println("individual loggers set to FINEST");
logMessages();
lgr.setLevel(Level.SEVERE);
System.out.println("com level: SEVERE");
logMessages();
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010