Unicode 汉字与GB内码的转换

西子浣纱城·Java信区:zizi (眨巴眨巴)

使用时先将下面的码表存成文件,例如table.txt创建一个GBUnicode实例,
new GBUnicode("table.txt") 以后调用GB2Uni和Uni2GB作内码转换.注意GB内码是用两个字节表示的.

import java.io.*;
import java.util.Hashtable;

public class GBUnicode
{
byte high[]=new byte[6763],low[]=new byte[6763];
char unichar[]=new char[6763];
Hashtable UniGB;

public GBUnicode(String table_file)throws IOException
{
    BufferedInputStream tables=
                     new BufferedInputStream(new FileInput(table_file));
    DataInputStream tables=new DataInputStream(new FileInputStream(table_file));

    int i,n=0;
    byte b,bl,bh,num[]=new byte[20];

    UniGB=new Hashtable(7000,1);
    while (n<6763 )
    {
      do
      {
        bh=(byte)tables.read();
      }while ((char)bh<=' '); //find first non-blank char

      bl=(byte)tables.read();
      high[n]=bh;
      low[n]=bl;
      do{
        b=(byte)tables.read();
      }while (b!=(byte)':'); //find ':'

      do
      {
        b=(byte)tables.read();
      }while ((char)b<=' '); //find next non-blank char to reaas number

      i=0;
      while ((char)b>='0' && (char)b<='9')
      {
        num[i++]=b;
        b=(byte)tables.read();
     }
      unichar[n]=(char)Integer.parseInt(new String(num,0,0,i)));

     if (UniGB.get(new Character(unichar[n]))!= null)
        System.out.println("Duplicated : "+unichar[n]);
     UniGB.put(new Character(unichar[n]),new Integer(n));
      n=n+1;
    }
    tables.close();
}

private int getGBindex(byte high,byte low)
{
    int i,j;
    i=high-(byte)0xb0;
    j=low-(byte)0xa1;
    if (i <39)
    {
      // L1 Chinese
      if (j<0 || j>94)
        return -1;
      return (i*94+j);
    }
    else if (i==39)
    {
      //one of the last 89 L1 Chinese
      if (j<0 || j>89)
        return -1;
      return (i*94+j);
    }
    else
    {
      //L2 Chinese
      if (j<0 || j>94)
        return -1;
      return (i*94+j-5);
    }
}

public byte[] Uni2GB(char unicode)
{

    Integer index=(Integer)UniGB.get(new Character(unicode));
    if (index==null)
      return null;
    byte ch[]=new byte[2];
    ch[0]=high[index.intValue()];
    ch[1]=low[index.intValue()];
    return ch;
}

public char GB2Uni(byte high, byte low)
{
    int index=getGBindex(high,low);
    if (index ==-1) //not GB Chinese
       return 0;
    return(unichar[index]);
}
}

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