如何在android中配置java.util.logging.logger以使用放在SD卡上的日志属性文件？

Question

我一直在尝试使用java.util.logging.logger将内容记录到SD卡上的文件中.现在,我希望记录器使用我将在SD卡上提供的日志记录配置/属性文件.

我一直在努力的方法是: -

我一直在尝试使用日志管理和java.util.prefs.Preferences中,但我得到了BackingStoreException - > AccessPermission异常 perculating下来到的.java/.userprefs /路径表示为一个错误消息STR /的prefs.xml未找到.

private void setLoggingProperties(File logProperties) throws Exception {
    try {
    if(logProperties!=null && logProperties.isFile() && logProperties.exists()) {
        String str = logProperties.getAbsolutePath();
        MyLogger.v(TAG,"Log Properties file path: " + str);
        if(str!=null && str.length()>=0) {
            Preferences logPropPref = Preferences.userNodeForPackage(SSCService.class);

            if(logPropPref!=null) {
                String path = logPropPref.get(LOG_CONFIG_FILE_KEY,"");
                if(path.equals(str)) {
                    SirfLogger.v(TAG,"No need to set config for log");
                    return;
                }
                MyLogger.v(TAG,"Setting log properties: " + str);
                logPropPref.put(LOG_CONFIG_FILE_KEY, str);
                logPropPref.flush();
            }
            LogManager lManager = LogManager.getLogManager();
            if(lManager!=null) {
                lManager.readConfiguration();
            }

        }   

    } 
    } catch(Exception ex) {
        MyLogger.v(TAG, "Exception setting log properties: " + ex.toString() + " , ignoring" );
    }

}

愿任何人提供一些见解吗？

-Robin

Answer 1

在完成可用的文档并进行一些命中和试验之后.这是它的工作原理: -

        static final String LOGGER_NAME = "com.robin.mylogger"
        LogManager lManager = LogManager.getLogManager();
        FileInputStream is = new FileInputStream(logProperties);
        if(lManager!=null) {
            lManager.readConfiguration(is);

        }
        mLoggerInstance = Logger.getLogger(LOGGER_NAME);
         if(mLoggerInstance!=null)
             LogManager.getLogManager().addLogger(mLoggerInstance);

logging.properties

               ############################################################
               #    Default Logging Configuration File
#
# You can use a different file by specifying a filename
# with the java.util.logging.config.file system property.  
# For example java -Djava.util.logging.config.file=myfile
############################################################

############################################################
#   Global properties
############################################################

# "handlers" specifies a comma separated list of log Handler 
# classes.  These handlers will be installed during VM startup.
# Note that these classes must be on the system classpath.
# By default we only configure a ConsoleHandler, which will only
# show messages at the INFO and above levels.
#handlers= java.util.logging.ConsoleHandler

# To also add the FileHandler, use the following line instead.
handlers= java.util.logging.FileHandler, com.android.internal.logging.AndroidHandler

# Default global logging level.
# This specifies which kinds of events are logged across
# all loggers.  For any given facility this global level
# can be overriden by a facility specific level
# Note that the ConsoleHandler also has a separate level
# setting to limit messages printed to the console.
.level= FINEST

############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################

# default file output is in user's home directory.
java.util.logging.FileHandler.pattern = /mnt/sdcard/csr/logs/test.log
java.util.logging.FileHandler.limit = 5000000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.level = FINEST
java.util.logging.FileHandler.formatter = java.util.logging.SimpleFormatter

# Limit the message that are printed on the console to INFO and above.
#java.util.logging.ConsoleHandler.level = FINEST
#java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

com.android.internal.logging.AndroidHandler.level = FINEST
com.android.internal.logging.AndroidHandler.formatter = java.util.logging.SimpleFormatter


############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################

# For example, set the com.xyz.foo logger to only log SEVERE
# messages:
#com.robin.mylogger.level = FINEST

请注意,此处的logging.properties中使用了两个处理程序.一个是文件处理程序,它登录到文件,另一个是com.android.internal.logging.AndroidHandler(它负责在logcat中正确显示日志).如果要在logcat中查看日志,则必须添加com.android.internal.logging.AndroidHandler.如果您不在日志记录属性中添加此处理程序,则所有日志将作为sys.err(警告级别)在logcat上引发.