使用正则表达式去除html中的标签元素以及js和css脚本和样式

public static void main(String[] args) {
		String str = readFile(new File("D:\workspace\izbra_front\WebRoot\aa\aa.java"));
		// 先过滤 script 标签
		String reg_tag = "<[\s]*?#t#[^>]*?>[\s\S]*?<[\s]*?\/[\s]*?#t#[\s]*?>".replace("#t#", "script");
		str = Pattern.compile(reg_tag,Pattern.CASE_INSENSITIVE).matcher(str).replaceAll("");
		// 再 过滤 hmtl 标签
		reg_tag = "<[^>]+>";
		reg_tag = "<[\s\S]*?>";
		str = Pattern.compile(reg_tag,Pattern.CASE_INSENSITIVE).matcher(str).replaceAll("");
		str = str.replaceAll(" ", "");
		str = str.replaceAll("\n{1,}", "#");
		str = str.startsWith("#") ? str.substring(1) : str;
		str = str.endsWith("#") ? str.substring(0, str.length() - 1) : str;
		System.out.println("数目=="+str.split("#").length);
		str = str.replaceAll("#", "\n");
		System.out.println(str);
		
		
	}
	
	public static String readFile(File file){
		StringBuilder sb = new StringBuilder();
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"));
			String line = null;
			while((line = br.readLine()) != null){
				if("添加".equals(line))
					continue;
				sb.append(line+"\n");
			}
			br.close();
		} catch (Exception e) {
			e.printStackTrace();
		} 
		return sb.toString();
	}public static void main(String[] args) {
		Strin