public class StrtoBin {

    public static void main(String[] args) {
        String str = "我是";
        byte[] b = str.getBytes();
        StringBuffer sb = new StringBuffer();
        for(int i = 0; i < b.length; i++) {
            sb.append(byteBin(b[i]));
        }
        System.out.println(sb.toString());
    }
    
    public static String byteBin(byte ib) {
        char[] Digit = {'0', '1'};
        char[] bin = new char[8];
        for(int i = 0; i < bin.length; i++) {
            bin[i] = Digit[(ib>>(7-i)) & 0X01];
        }
        return new String(bin);
    }
}