@Test
public void testContentTypeByPath() {

	assertEquals("text/plain",
			ContentTypeUtil.getContentTypeByPath("/a/bb.txt"));
	assertEquals("text/html",
			ContentTypeUtil.getContentTypeByPath("/a/bb.html"));
	assertNull(ContentTypeUtil.getContentTypeByPath("/a/bb.notexists"));
	assertNull(ContentTypeUtil.getContentTypeByPath("/a/bb"));
}