tomcat 日志 java.util.logging.Logger使用 （四）

今天将写好的代码放到ubuntu上测试，发现了几个问题。

1：每次svn update源码，tomcat重新部署以后 log 文件会消失~~

查看源码发现：

java.util.logging.FileHandler

private void configure() {
        LogManager manager = LogManager.getLogManager();

	String cname = getClass().getName();

	pattern = manager.getStringProperty(cname + ".pattern", "%h/java%u.log");
	limit = manager.getIntProperty(cname + ".limit", 0);
	if (limit < 0) {
	    limit = 0;
	}
        count = manager.getIntProperty(cname + ".count", 1);
	if (count <= 0) {
	    count = 1;
	}
        append = manager.getBooleanProperty(cname + ".append", false);
	setLevel(manager.getLevelProperty(cname + ".level", Level.ALL));
	setFilter(manager.getFilterProperty(cname + ".filter", null));
	setFormatter(manager.getFormatterProperty(cname + ".formatter",	new XMLFormatter()));
	try {
	    setEncoding(manager.getStringProperty(cname +".encoding", null));
	} catch (Exception ex) {
	    try {
	        setEncoding(null);
	    } catch (Exception ex2) {
		// doing a setEncoding with null should always work.
		// assert false;
	    }
	}
    }

其中这行 说明默认不会追加log数据的

   append = manager.getBooleanProperty(cname + ".append", false);

所以需要在logging.properties下配置一下

java.util.logging.FileHandler.append = true 

到此问题解决

2：注意logger.properties文件中有这么一句, 也就是说基本上不可以通过配置文件配置自定义Handler了

These handlers will be installed during VM startup.
# Note that these classes must be on the system classpath.

# "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, java.util.logging.FileHandler