public static String escapeHtml4(CharSequence html) {
		Html4Escape escape = new Html4Escape();
		return escape.replace(html).toString();
	}
@Test
	public void escapeSingleQuotesTest(){
		// 单引号不做转义
		String str = "'some text with single quotes'";
		final String s = EscapeUtil.escapeHtml4(str);
		assertEquals("'some text with single quotes'", s);
	}