接口 Log
public interface Log
A simple logging interface abstracting logging APIs. In order to be instantiated successfully byLogFactory
, classes that implement this interface must have a constructor that takes a single String parameter representing the "name" of this Log.The six logging levels used by
Log
are (in order):- trace (the least serious)
- debug
- info
- warn
- error
- fatal (the most serious)
Performance is often a logging concern. By examining the appropriate property, a component can avoid expensive operations (producing information to be logged).
For example,
if (log.isDebugEnabled()) { ... do something expensive ... log.debug(theResult); }
Configuration of the underlying logging system will generally be done external to the Logging APIs, through whatever mechanism is supported by that system.
- 从以下版本开始:
- 5.0
- 作者:
- Juergen Hoeller (for the
spring-jcl
variant)
方法概要
所有方法 实例方法 抽象方法 修饰符和类型 方法 说明 void
debug(Object message)
Logs a message with debug log level.void
debug(Object message, Throwable t)
Logs an error with debug log level.void
error(Object message)
Logs a message with error log level.void
error(Object message, Throwable t)
Logs an error with error log level.void
fatal(Object message)
Logs a message with fatal log level.void
fatal(Object message, Throwable t)
Logs an error with fatal log level.void
info(Object message)
Logs a message with info log level.void
info(Object message, Throwable t)
Logs an error with info log level.boolean
isDebugEnabled()
Is debug logging currently enabled?boolean
isErrorEnabled()
Is error logging currently enabled?boolean
isFatalEnabled()
Is fatal logging currently enabled?boolean
isInfoEnabled()
Is info logging currently enabled?boolean
isTraceEnabled()
Is trace logging currently enabled?boolean
isWarnEnabled()
Is warn logging currently enabled?void
trace(Object message)
Logs a message with trace log level.void
trace(Object message, Throwable t)
Logs an error with trace log level.void
warn(Object message)
Logs a message with warn log level.void
warn(Object message, Throwable t)
Logs an error with warn log level.
方法详细资料
isFatalEnabled
boolean isFatalEnabled()
Is fatal logging currently enabled?Call this method to prevent having to perform expensive operations (for example,
String
concatenation) when the log level is more than fatal.- 返回:
- true if fatal is enabled in the underlying logger.
isErrorEnabled
boolean isErrorEnabled()
Is error logging currently enabled?Call this method to prevent having to perform expensive operations (for example,
String
concatenation) when the log level is more than error.- 返回:
- true if error is enabled in the underlying logger.
isWarnEnabled
boolean isWarnEnabled()
Is warn logging currently enabled?Call this method to prevent having to perform expensive operations (for example,
String
concatenation) when the log level is more than warn.- 返回:
- true if warn is enabled in the underlying logger.
isInfoEnabled
boolean isInfoEnabled()
Is info logging currently enabled?Call this method to prevent having to perform expensive operations (for example,
String
concatenation) when the log level is more than info.- 返回:
- true if info is enabled in the underlying logger.
isDebugEnabled
boolean isDebugEnabled()
Is debug logging currently enabled?Call this method to prevent having to perform expensive operations (for example,
String
concatenation) when the log level is more than debug.- 返回:
- true if debug is enabled in the underlying logger.
isTraceEnabled
boolean isTraceEnabled()
Is trace logging currently enabled?Call this method to prevent having to perform expensive operations (for example,
String
concatenation) when the log level is more than trace.- 返回:
- true if trace is enabled in the underlying logger.
fatal
void fatal(Object message, Throwable t)
Logs an error with fatal log level.- 参数:
message
- log this messaget
- log this cause
error
void error(Object message, Throwable t)
Logs an error with error log level.- 参数:
message
- log this messaget
- log this cause
warn
void warn(Object message, Throwable t)
Logs an error with warn log level.- 参数:
message
- log this messaget
- log this cause
info
void info(Object message, Throwable t)
Logs an error with info log level.- 参数:
message
- log this messaget
- log this cause
debug
void debug(Object message, Throwable t)
Logs an error with debug log level.- 参数:
message
- log this messaget
- log this cause