Convert to String from UTF Byte Array - Java java.lang

Java examples for java.lang:String UTF

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Description

Convert to String from UTF Byte Array

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        byte[] bytes = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(fromUTF8ByteArray(bytes));
    }//from   w w  w  . j  a  va 2 s.  co m

    public static String fromUTF8ByteArray(byte[] bytes) {
        int i = 0;
        int length = 0;

        while (i < bytes.length) {
            length++;
            if ((bytes[i] & 0xf0) == 0xf0) {
                // surrogate pair
                length++;
                i += 4;
            } else if ((bytes[i] & 0xe0) == 0xe0) {
                i += 3;
            } else if ((bytes[i] & 0xc0) == 0xc0) {
                i += 2;
            } else {
                i += 1;
            }
        }

        char[] cs = new char[length];

        i = 0;
        length = 0;

        while (i < bytes.length) {
            char ch;

            if ((bytes[i] & 0xf0) == 0xf0) {
                int codePoint = ((bytes[i] & 0x03) << 18)
                        | ((bytes[i + 1] & 0x3F) << 12)
                        | ((bytes[i + 2] & 0x3F) << 6)
                        | (bytes[i + 3] & 0x3F);
                int U = codePoint - 0x10000;
                char W1 = (char) (0xD800 | (U >> 10));
                char W2 = (char) (0xDC00 | (U & 0x3FF));
                cs[length++] = W1;
                ch = W2;
                i += 4;
            } else if ((bytes[i] & 0xe0) == 0xe0) {
                ch = (char) (((bytes[i] & 0x0f) << 12)
                        | ((bytes[i + 1] & 0x3f) << 6) | (bytes[i + 2] & 0x3f));
                i += 3;
            } else if ((bytes[i] & 0xd0) == 0xd0) {
                ch = (char) (((bytes[i] & 0x1f) << 6) | (bytes[i + 1] & 0x3f));
                i += 2;
            } else if ((bytes[i] & 0xc0) == 0xc0) {
                ch = (char) (((bytes[i] & 0x1f) << 6) | (bytes[i + 1] & 0x3f));
                i += 2;
            } else {
                ch = (char) (bytes[i] & 0xff);
                i += 1;
            }

            cs[length++] = ch;
        }

        return new String(cs);
    }
}

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