android - 如何在 android 中配置 java.util.logging.logger 以使用放置在 sdcard 上的日志记录属性文件？

Question

我一直在尝试使用 java.util.logging.logger 将内容记录到 sdcard 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。

我一直在尝试的一种方法是:-

我一直在尝试使用 logmanager 和 java.util.prefs.preferences，但我得到了 BackingStoreException-->AccessPermission Exception 向下渗透到 .java/.userprefs/path 的错误消息未找到由 str/prefs.xml 表示的。

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" );
    }

}

有人可以提供一些见解吗？

-罗宾

Answer 1

在阅读了可用的文档并做了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);

日志记录属性

               ############################################################
               #    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filehandler，负责登录文件，另一个是com.android.internal.logging.AndroidHandler(负责在logcat中正确显示日志)。如果您还想在 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，所有日志将作为 sys.err(警告级别)抛出到 logcat 上。