jetbrick-commons/src/main/java/jetbrick/io/PathUtils.java
public static String concat(final String parent, final String child) {
        if (parent == null) {
            return normalize(child);
        }
        if (child == null) {
            return normalize(parent);
        }
        return normalize(parent + '/' + child);
    }
public static String concat(final String parent, final String child) {
        if (parent == null) {
            return normalize(child);
        }
        if (child == null) {
            return normalize(parent);
        }
        return normalize(parent + '/' + child);
    }
public static String concat ( final String parent , final String child ) { if ( parent == null ) { return normalize ( child ) ; } if ( child == null ) { return normalize ( parent ) ; } return normalize ( parent + ' ' + child ) ; }
组合路径.
组合路径 .