로거 사용
Java™ 로깅을 사용하여 메시지를 로깅하고 추적을 추가할 수 있습니다.
이 태스크 정보
프로시저
로컬화된 메시지
다음 샘플은 로컬화된 메시지에 적용됩니다.// note - generally avoid use of FINE, FINER, FINEST levels for messages to be consistent with
// WebSphere Application Server
String componentName = "com.ibm.websphere.componentX";
String resourceBundleName = "com.ibm.websphere.componentX.Messages";
Logger logger = Logger.getLogger(componentName, resourceBundleName);
// "Convenience" methods - not generally recommended due to lack of class
/ method names
// - cannot specify message substitution parameters
// - cannot specify class and method names
if (logger.isLoggable(Level.SEVERE))
logger.severe("MSG_KEY_01");
if (logger.isLoggable(Level.WARNING))
logger.warning("MSG_KEY_01");
if (logger.isLoggable(Level.INFO))
logger.info("MSG_KEY_01");
if (logger.isLoggable(Level.CONFIG))
logger.config("MSG_KEY_01");
// log methods are not generally used due to lack of class and method
names
// - enable use of WebSphere Application Server-specific levels
// - enable use of message substitution parameters
// - cannot specify class and method names
if (logger.isLoggable(WsLevel.FATAL))
logger.log(WsLevel.FATAL, "MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.SEVERE))
logger.log(Level.SEVERE, "MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.WARNING))
logger.log(Level.WARNING, "MSG_KEY_01", "parameter 1");
if (logger.isLoggable(WsLevel.AUDIT))
logger.log(WsLevel.AUDIT, "MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.INFO))
logger.log(Level.INFO, "MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.CONFIG))
logger.log(Level.CONFIG, "MSG_KEY_01", "parameter 1");
if (logger.isLoggable(WsLevel.DETAIL))
logger.log(WsLevel.DETAIL, "MSG_KEY_01", "parameter 1");
// logp methods are the way to log
// - enable use of WebSphere Application Server-specific levels
// - enable use of message substitution parameters
// - enable use of class and method names
if (logger.isLoggable(WsLevel.FATAL))
logger.logp(WsLevel.FATAL, className, methodName, "MSG_KEY_01",
"parameter 1");
if (logger.isLoggable(Level.SEVERE))
logger.logp(Level.SEVERE, className, methodName, "MSG_KEY_01",
"parameter 1");
if (logger.isLoggable(Level.WARNING))
logger.logp(Level.WARNING, className, methodName, "MSG_KEY_01",
"parameter 1");
if (logger.isLoggable(WsLevel.AUDIT))
logger.logp(WsLevel.AUDIT, className, methodName, "MSG_KEY_01",
"parameter 1");
if (logger.isLoggable(Level.INFO))
logger.logp(Level.INFO, className, methodName, "MSG_KEY_01",
"parameter 1");
if (logger.isLoggable(Level.CONFIG))
logger.logp(Level.CONFIG, className, methodName, "MSG_KEY_01",
"parameter 1");
if (logger.isLoggable(WsLevel.DETAIL))
logger.logp(WsLevel.DETAIL, className, methodName, "MSG_KEY_01",
"parameter 1");
// logrb methods are not generally used due to diminished performance
of switching resource bundles dynamically
// - enable use of WebSphere Application Server-specific levels
// - enable use of message substitution parameters
// - enable use of class and method names
String resourceBundleNameSpecial =
"com.ibm.websphere.componentX.MessagesSpecial";
if (logger.isLoggable(WsLevel.FATAL))
logger.logrb(WsLevel.FATAL, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.SEVERE))
logger.logrb(Level.SEVERE, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.WARNING))
logger.logrb(Level.WARNING, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
if (logger.isLoggable(WsLevel.AUDIT))
logger.logrb(WsLevel.AUDIT, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.INFO))
logger.logrb(Level.INFO, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
if (logger.isLoggable(Level.CONFIG))
logger.logrb(Level.CONFIG, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
if (logger.isLoggable(WsLevel.DETAIL))
logger.logrb(WsLevel.DETAIL, className, methodName, resourceBundleNameSpecial,
"MSG_KEY_01", "parameter 1");
추적 또는 로컬화되지 않은 컨텐츠의 경우 다음 샘플이 적용됩니다. // note - generally avoid use of FATAL, SEVERE, WARNING, AUDIT,
// INFO, CONFIG, DETAIL levels for trace
// to be consistent with WebSphere Application Server
String componentName = "com.ibm.websphere.componentX";
Logger logger = Logger.getLogger(componentName);
// Entering / Exiting methods are used for non trivial methods
if (logger.isLoggable(Level.FINER))
logger.entering(className, methodName);
if (logger.isLoggable(Level.FINER))
logger.entering(className, methodName, "method param1");
if (logger.isLoggable(Level.FINER))
logger.exiting(className, methodName);
if (logger.isLoggable(Level.FINER))
logger.exiting(className, methodName, "method result");
// Throwing method is not generally used due to lack of message - use
logp with a throwable parameter instead
if (logger.isLoggable(Level.FINER))
logger.throwing(className, methodName, throwable);
// Convenience methods are not generally used due to lack of class
/ method names
// - cannot specify message substitution parameters
// - cannot specify class and method names
if (logger.isLoggable(Level.FINE))
logger.fine("This is my trace");
if (logger.isLoggable(Level.FINER))
logger.finer("This is my trace");
if (logger.isLoggable(Level.FINEST))
logger.finest("This is my trace");
// log methods are not generally used due to lack of class and
method names
// - enable use of WebSphere Application Server-specific levels
// - enable use of message substitution parameters
// - cannot specify class and method names
if (logger.isLoggable(Level.FINE))
logger.log(Level.FINE, "This is my trace", "parameter 1");
if (logger.isLoggable(Level.FINER))
logger.log(Level.FINER, "This is my trace", "parameter 1");
if (logger.isLoggable(Level.FINEST))
logger.log(Level.FINEST, "This is my trace", "parameter 1");
// logp methods are the recommended way to log
// - enable use of WebSphere Application Server-specific levels
// - enable use of message substitution parameters
// - enable use of class and method names
if (logger.isLoggable(Level.FINE))
logger.logp(Level.FINE, className, methodName, "This is my trace",
"parameter 1");
if (logger.isLoggable(Level.FINER))
logger.logp(Level.FINER, className, methodName, "This is my trace",
"parameter 1");
if (logger.isLoggable(Level.FINEST))
logger.logp(Level.FINEST, className, methodName, "This is my trace",
"parameter 1");
// logrb methods are not applicable for trace logging because no localization
is involved
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
/**
* MyCustomHandler outputs contents to a specified file
*/
public class MyCustomHandler extends Handler {
FileOutputStream fileOutputStream;
PrintWriter printWriter;
public MyCustomHandler(String filename) {
super();
// check input parameter
if (filename == null || filename == "")
filename = "mylogfile.txt";
try {
// initialize the file
fileOutputStream = new FileOutputStream(filename);
printWriter = new PrintWriter(fileOutputStream);
setFormatter(new SimpleFormatter());
}
catch(Exception e){
// implement exception handling...
}
}
/* (non-API documentation)
* @see java.util.logging.Handler#publish(java.util.logging.LogRecord)
*/
public void publish(LogRecord record) {
// ensure that this log record should be logged by this Handler
if (!isLoggable(record))
return;
// Output the formatted data to the file
printWriter.println(getFormatter().format(record));
}
/* (non-API documentation)
* @see java.util.logging.Handler#flush()
*/
public void flush() {
printWriter.flush();
}
/* (non-API documentation)
* @see java.util.logging.Handler#close()
*/
public void close() throws SecurityException {
printWriter.close();
}
}
사용자 정의 필터는 레벨에서 제공하는 제어 외에도 로그되는 내용에 대한 선택적 보조 제어를 제공합니다. 사용자 정의 필터를 작성하기 위한 메커니즘은 IBM Developer Kit, Java Technology Edition에서 제공하는 필터 인터페이스 지원입니다. 개발자 킷에서 구현된 필터에 대해 잘 알지 못하는 경우 다양한 텍스트로부터 또는 java.util.logging API에 대한 API 문서를 읽어 자세한 정보를 얻을 수 있습니다.
다음 예는 사용자 정의 필터를 보여줍니다.
/**
* This class filters out all log messages starting with SECJ022E, SECJ0373E, or SECJ0350E.
*/
import java.util.logging.Filter;
import java.util.logging.Handler;
import java.util.logging.Logger;
import java.util.logging.LogRecord;
public class MyFilter implements Filter {
public boolean isLoggable(LogRecord lr) {
String msg = lr.getMessage();
if (msg.startsWith("SECJ0222E") || msg.startsWith("SECJ0373E") || msg.startsWith("SECJ0350E")) {
return false;
}
return true;
}
}
//This code will register the log filter with the root Logger's handlers
// (including the WAS system logs):
...
Logger rootLogger = Logger.getLogger("");
rootLogger.setFilter(new MyFilter());
포맷터는 이벤트를 형식화합니다. 핸들러는 하나 이상의 포맷터와 연관됩니다. 사용자 정의 포맷터를 작성하기 위한 메커니즘은 IBM Developer Kit, Java Technology Edition에서 제공하는 Formatter 클래스 지원입니다. 개발자 킷에서 구현된 포맷터에 대해 잘 알지 못하는 경우 다양한 텍스트로부터 또는 java.util.logging API에 대한 API 문서를 읽어 자세한 정보를 얻을 수 있습니다.
다음 예는 사용자 정의 포맷터를 보여줍니다.
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;
/**
* MyCustomFormatter formats the LogRecord as follows:
* date level localized message with parameters
*/
public class MyCustomFormatter extends Formatter {
public MyCustomFormatter() {
super();
}
public String format(LogRecord record) {
// Create a StringBuffer to contain the formatted record
// start with the date.
StringBuffer sb = new StringBuffer();
// Get the date from the LogRecord and add it to the buffer
Date date = new Date(record.getMillis());
sb.append(date.toString());
sb.append(" ");
// Get the level name and add it to the buffer
sb.append(record.getLevel().getName());
sb.append(" ");
// Get the formatted message (includes localization
// and substitution of paramters) and add it to the buffer
sb.append(formatMessage(record));
sb.append("\n");
return sb.toString();
}
}
사용자 정의 핸들러, 필터 및 포맷터를 추가하면 기본 WebSphere Application Server 로깅 인프라의 구성을 통해 얻을 수 있는 것 이상으로 로깅 환경을 사용자 정의할 수 있습니다. 다음 예는 로거의 com.myCompany 서브트리에 요청을 처리할 새 핸들러는 추가하는 방법을 보여줍니다(로거 계층 구조 구성 참조). 이 샘플의 기본 메소드는 새로 구성된 로거를 사용하는 방법의 예를 제공합니다.
import java.util.Vector;
import java.util.logging.Filter;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyCustomLogging {
public MyCustomLogging() {
super();
}
public static void initializeLogging() {
// Get the logger that you want to attach a custom Handler to
String defaultResourceBundleName = "com.myCompany.Messages";
Logger logger = Logger.getLogger("com.myCompany", defaultResourceBundleName);
// Set up a custom Handler (see MyCustomHandler example)
Handler handler = new MyCustomHandler("MyOutputFile.log");
// Set up a custom Filter (see MyCustomFilter example)
Vector acceptableLevels = new Vector();
acceptableLevels.add(Level.INFO);
acceptableLevels.add(Level.SEVERE);
Filter filter = new MyCustomFilter(acceptableLevels);
// Set up a custom Formatter (see MyCustomFormatter example)
Formatter formatter = new MyCustomFormatter();
// Connect the filter and formatter to the handler
handler.setFilter(filter);
handler.setFormatter(formatter);
// Connect the handler to the logger
logger.addHandler(handler);
// avoid sending events logged to com.myCompany showing up in WebSphere
// Application Server logs
logger.setUseParentHandlers(false);
}
public static void main(String[] args) {
initializeLogging();
Logger logger = Logger.getLogger("com.myCompany");
logger.info("This is a test INFO message");
logger.warning("This is a test WARNING message");
logger.logp(Level.SEVERE, "MyCustomLogging", "main", "This is a test SEVERE message");
}
}
C:\>type MyOutputFile.log Sat Sep 04 11:21:19 EDT 2004 INFO This is a test INFO message Sat Sep 04 11:21:19 EDT 2004 SEVERE This is a test SEVERE message