Tomcat CatalinaProperties的loadProperties()方法

CatalinaProperties是加载全局配置

该类有一个Properties properties成员

1 从系统变量中看是否有配置文件，如果有的话加载

private static String getConfigUrl() {
        return System.getProperty("catalina.config");
    }

if (configUrl != null) {
                is = (new URL(configUrl)).openStream();
            }

 

2.如果系统变量没有配置，查找CatalinaBase()下的conf目录下的catalina.properties，有的话加载

if (is == null) {
            try {
                File home = new File(getCatalinaBase());
                File conf = new File(home, "conf");
                File propsFile = new File(conf, "catalina.properties");
                is = new FileInputStream(propsFile);
            } catch (Throwable t) {
                handleThrowable(t);
            }
        }

 

3.如果还没有，在/org/apache/catalina/startup下寻找catalina.properties

if (is == null) {
            try {
                is = CatalinaProperties.class.getResourceAsStream
                    ("/org/apache/catalina/startup/catalina.properties");
            } catch (Throwable t) {
                handleThrowable(t);
            }
        }

 

按照以上顺序寻找配置文件，如果找到就load

 properties = new Properties();
 properties.load(is);