/**
     * 替换四个字节的字符 '\xF0\x9F\x98\x84\xF0\x9F）的解决方案 😁
     * @author ChenGuiYong
     * @data 2015年8月11日 上午10:31:50
     * @param content
     * @return
     */
    public static String removeFourChar(String content) {
        byte[] conbyte = content.getBytes();
        for (int i = 0; i < conbyte.length; i++) {
            if ((conbyte[i] & 0xF8) == 0xF0) {
                for (int j = 0; j < 4; j++) {                          
                    conbyte[i+j]=0x30;                     
                }  
                i += 3;
            }
        }
        content = new String(conbyte);
        return content.replaceAll("0000", "");
    }

结果：

String title = "ff的范德萨分😁😁😁😁Llfldakf;dsk。f😁😁😁😁😁😁daslfjdsa;lfkjdsd'j'l'f'k'd'j'sa'l'k";
        System.out.println(Test_Common2.removeFourChar(title).replaceAll("0000", ""));
        //ff的范德萨分Llfldakf;dsk。fdaslfjdsa;lfkjdsd'j'l'f'k'd'j'sa'l'k