getUTF8StringFromGBKString

最新推荐文章于 2023-04-22 17:23:08 发布

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最新推荐文章于 2023-04-22 17:23:08 发布

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本文提供了一个Java编码转换的具体实例，展示了如何将GBK编码的字符串转换为UTF-8编码，并通过手动构造UTF-8字节来实现这一过程。此方法有助于理解不同字符集之间的转换原理。

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http://www.iteye.com/problems/94345

package test;

import java.io.UnsupportedEncodingException;

public class TestEncoder {

/**
* @param args
*/
public static void main(String[] args) throws Exception {
  String gbk = "iteye问答频道编码转换问题";

  String iso = new String(gbk.getBytes("UTF-8"),"ISO-8859-1");

  System.out.println(iso);

  String utf8 = new String(iso.getBytes("ISO-8859-1"),"UTF-8");
  System.out.println(utf8);

  System.out.println(getUTF8StringFromGBKString(gbk));
}

public static String getUTF8StringFromGBKString(String gbkStr) {
  try {
   return new String(getUTF8BytesFromGBKString(gbkStr), "UTF-8");
  } catch (UnsupportedEncodingException e) {
   throw new InternalError();
  }
}

public static byte[] getUTF8BytesFromGBKString(String gbkStr) {
  int n = gbkStr.length();
  byte[] utfBytes = new byte[3 * n];
  int k = 0;
  for (int i = 0; i < n; i++) {
   int m = gbkStr.charAt(i);
   if (m < 128 && m >= 0) {
    utfBytes[k++] = (byte) m;
    continue;
   }
   utfBytes[k++] = (byte) (0xe0 | (m >> 12));
   utfBytes[k++] = (byte) (0x80 | ((m >> 6) & 0x3f));
   utfBytes[k++] = (byte) (0x80 | (m & 0x3f));
  }
  if (k < utfBytes.length) {
   byte[] tmp = new byte[k];
   System.arraycopy(utfBytes, 0, tmp, 0, k);
   return tmp;
  }
  return utfBytes;
}
}