transcn.java

手机的联网应用

package cn.com.javachen;

import java.io.IOException;

public class transCN {
	static public String convertUTF8String2Unicode(String instr)
			throws IOException {
		// byte[] strbytes = instr.getBytes();
		int charindex = instr.length();
		int actualValue;
		int inputValue;
		StringBuffer sbtemp = new StringBuffer();

		for (int i = 0; i < charindex;) {

			actualValue = -1;
			inputValue = instr.charAt(i++);

			inputValue &= 0xff;

			if ((inputValue & 0x80) == 0) {
				actualValue = inputValue;
			} else if ((inputValue & 0xF8) == 0xF0) {
				actualValue = (inputValue & 0x1f) << 18;

				int nextByte = instr.charAt(i++) & 0xff;
				if ((nextByte & 0xC0) != 0x80)
					throw new IOException("Invalid UTF-8 format");
				actualValue += (nextByte & 0x3F) << 12;

				nextByte = instr.charAt(i++) & 0xff;
				if ((nextByte & 0xC0) != 0x80)
					throw new IOException("Invalid UTF-8 format");
				actualValue += (nextByte & 0x3F) << 6;

				nextByte = instr.charAt(i++) & 0xff;
				if ((nextByte & 0xC0) != 0x80)
					throw new IOException("Invalid UTF-8 format");
				actualValue += (nextByte & 0x3F);
			} else if ((inputValue & 0xF0) == 0xE0) {
				actualValue = (inputValue & 0x1f) << 12;

				int nextByte = instr.charAt(i++) & 0xff;
				if ((nextByte & 0xC0) != 0x80)
					throw new IOException("Invalid UTF-8 format");
				actualValue += (nextByte & 0x3F) << 6;

				nextByte = instr.charAt(i++) & 0xff;
				if ((nextByte & 0xC0) != 0x80)
					throw new IOException("Invalid UTF-8 format");
				actualValue += (nextByte & 0x3F);
			} else if ((inputValue & 0xE0) == 0xC0) {
				actualValue = (inputValue & 0x1f) << 6;

				int nextByte = instr.charAt(i++) & 0xff;
				if ((nextByte & 0xC0) != 0x80)
					throw new IOException("Invalid UTF-8 format");
				actualValue += (nextByte & 0x3F);
			}
			sbtemp.append((char) actualValue);
		}

		return sbtemp.toString();
	}

	public static byte[] convertUnicode2UTF8Byte(String instr) {
		int len = instr.length();
		byte[] abyte = new byte[len << 2];
		int j = 0;
		for (int i = 0; i < len; i++) {
			char c = instr.charAt(i);

			if (c < 0x80) {
				abyte[j++] = (byte) c;
			} else if (c < 0x0800) {
				abyte[j++] = (byte) (((c >> 6) & 0x1F) | 0xC0);
				abyte[j++] = (byte) ((c & 0x3F) | 0x80);
			} else if (c < 0x010000) {
				abyte[j++] = (byte) (((c >> 12) & 0x0F) | 0xE0);
				abyte[j++] = (byte) (((c >> 6) & 0x3F) | 0x80);
				abyte[j++] = (byte) ((c & 0x3F) | 0x80);
			} else if (c < 0x200000) {
				abyte[j++] = (byte) (((c >> 18) & 0x07) | 0xF8);
				abyte[j++] = (byte) (((c >> 12) & 0x3F) | 0x80);
				abyte[j++] = (byte) (((c >> 6) & 0x3F) | 0x80);
				abyte[j++] = (byte) ((c & 0x3F) | 0x80);
			}
		}

		byte[] retbyte = new byte[j];
		for (int i = 0; i < j; i++) {
			retbyte[i] = abyte[i];
		}
		return retbyte;
	}

	public static String ISO106462Unicode(byte[] myByte) {
		String result = new String("");

		StringBuffer sb = new StringBuffer("");
		try {
			/* 将字符串转换成byte数组 */
			// byte[] myByte= str.getBytes("ISO10646");
			int len = myByte.length;

			for (int i = 0; i < len; i = i + 2) {
				byte hiByte = myByte[i];
				byte loByte = myByte[i + 1];

				int ch = (int) hiByte << 8;
				ch = ch & 0xff00;
				ch += (int) loByte & 0xff;

				sb.append((char) ch);
			}

			result = new String(sb.toString());

		} catch (Exception e) {
			System.out.println("Encoding Error");
		}
		return result;
	}

	public static byte[] Unicode2Byte(String s) {
		int len = s.length();
		byte abyte[] = new byte[len << 1];
		int j = 0;
		for (int i = 0; i < len; i++) {
			char c = s.charAt(i);
			abyte[j++] = (byte) (c & 0xff);
			abyte[j++] = (byte) (c >> 8);
		}

		return abyte;
	}
}