public class CharEncode {
  /**
    * @param str
    *                        字符
    * @param charsetName
    *                        编码
    * @param debug
    *                        是否调试
    * @throws UnsupportedEncodingException
    */
  public static void displayEncode(String str, String charsetName,
      boolean debug) throws UnsupportedEncodingException {
    System.out.println("----------------------------------");
    byte[] bytes = str.getBytes(charsetName);
    int bytes_length = bytes.length;

System.out.println("字符:" + str + "\t编码:" + charsetName + "\t共占用"
        + bytes_length + "bytes(字节)," + bytes_length * 8
        + "bit(位)\t每个字节的情况如下:");
    for (int i = 0; i < bytes_length; i++) {

System.out.print("bytes[" + i + "]的十进制为:" + bytes[i]);// 获取byte字节

Integer int_byte = (int) bytes[i];// 强制转化为int,应为bytes只占8bit,而int占32bit所以个人认为万无一失.

String binaryString = Integer.toBinaryString(int_byte);// 获取整数的2进制的String表示方式
      String hexString = Integer.toHexString(int_byte);// 获取整数的16进制的String表示方式
      String octalString = Integer.toOctalString(int_byte);// 获取整数的16进制的String表示方式
      if (debug) {
        System.out.print("\t对应的十进制为:" + int_byte);
        System.out.print("\t对应整数的二进制为:" + binaryString);
        System.out.print("\t对应整数的八进制为:" + octalString);
        System.out.print("\t对应整数的十六进制为:" + hexString);
      }

/** **八进制格式显示* */
      int octalString_length = octalString.length();
      System.out.print("\t八进制为:"
          + octalString.substring(octalString_length - 2,
              octalString_length));
      /** **十六进制格式显示* */
      int hexString_length = hexString.length();
      System.out.print("\t十六进制为:"
          + hexString.substring(hexString_length - 2,
              hexString_length));

/** **为了方便阅读,将二进制以每4位一组的格式显示* */

// 不足8位的,在前段加"0"补齐
      while (binaryString.length() < 8) {
        binaryString = "0" + binaryString;
      }
      int binaryString_length = binaryString.length();

String first = binaryString.substring(binaryString_length - 8,
          binaryString_length - 4);// 取前4位
      String second = binaryString.substring(binaryString_length - 4,
          binaryString_length);// 取后4位

System.out.println("\t二进制为:" + first + " " + second);

}
    System.out.println();
  }

public static void main(String[] args) throws UnsupportedEncodingException {

// 通过UltraEdit知道: 汉字"我"在gbk编码下的十六进制是"ced2";

boolean debug = false;
    String str = "";
    String utf_8 = "utf-8";
    String gbk = "gbk";
    String gb2312 = "gb2312";
    String iso8859_1 = "iso8859-1";

str = "我";
    System.out.println("*****************" + str + "*******************\n");
    displayEncode(str, utf_8, debug);
    displayEncode(str, gbk, debug);
    displayEncode(str, gb2312, debug);
    displayEncode(str, iso8859_1, debug);

str = "A";
    System.out.println("*****************" + str + "*******************\n");
    displayEncode(str, utf_8, debug);
    displayEncode(str, gbk, debug);
    displayEncode(str, gb2312, debug);
    displayEncode(str, iso8859_1, debug);

str = "1";
    System.out.println("*****************" + str + "*******************\n");
    displayEncode(str, utf_8, debug);

}
}