从GB2312到Unicode转换表制作

简体中文有两种常用编码：GB2312 和 Unicode. 它们的对应关系可以用
下面的程式所生成：

/**
* GB2312Unicde.java
* Copyright (c) 2003 by Dr. Herong Yang, http://www.herongyang.com/
*/
import java.io.*;
import java.nio.*;
import java.nio.charset.*;
class GB2312Unicde {
static OutputStream out = null;
static char hexDigit[] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
static int b_out[] = {201,267,279,293,484,587,625,657,734,782,827,
874,901,980,5590};
static int e_out[] = {216,268,280,294,494,594,632,694,748,794,836,
894,903,994,5594};
public static void main(String[] args) {
try {
out = new FileOutputStream("gb2312.gb");
writeCode();
out.close();
} catch (IOException e) {
System.out.println(e.toString());
}
}
public static void writeCode() throws IOException {
boolean reserved = false;
String name = null;
// GB2312 is not supported by JDK. So I am using GBK.
CharsetDecoder gbdc = Charset.forName("GBK").newDecoder();
CharsetEncoder uxec = Charset.forName("UTF-16BE").newEncoder();
CharsetEncoder u8ec = Charset.forName("UTF-8").newEncoder();
ByteBuffer gbbb = null;
ByteBuffer uxbb = null;
ByteBuffer u8bb = null;
CharBuffer cb = null;
int count = 0;
for (int i=1; i<=94; i++) {
// Defining row settings
if (i>=1 && i<=9) {
reserved = false;
name = "Graphic symbols";
} else if (i>=10 && i<=15) {
reserved = true;
name = "Reserved";
} else if (i>=16 && i<=55) {
reserved = false;
name = "Level 1 characters";
} else if (i>=56 && i<=87) {
reserved = false;
name = "Level 2 characters";
} else if (i>=88 && i<=94) {
reserved = true;
name = "Reserved";
}
// writing row title
writeln();
writeString("<p>");
writeNumber(i);
writeString(" Row: "+name);
writeln();
writeString("</p>");
writeln();
if (!reserved) {
writeln();
writeHeader();
// looping through all characters in one row
for (int j=1; j<=94; j++) {
byte hi = (byte)(0xA0 + i);
byte lo = (byte)(0xA0 + j);
if (validGB(i,j)) {
// getting GB, UTF-16BE, UTF-8 codes
gbbb = ByteBuffer.wrap(new byte[]{hi,lo});
try {
cb = gbdc.decode(gbbb);
uxbb = uxec.encode(cb);
cb.rewind();
u8bb = u8ec.encode(cb);
} catch (CharacterCodingException e) {
cb = null;
uxbb = null;
u8bb = null;
}
} else {
cb = null;
uxbb = null;
u8bb = null;
}
writeNumber(i);
writeNumber(j);
writeString(" ");
if (cb!=null) {
writeByte(hi);
writeByte(lo);
writeString(" ");
writeHex(hi);
writeHex(lo);
count++;
} else {
writeGBSpace();
writeString(" null");
}
writeString(" ");
writeByteBuffer(uxbb,2);
writeString(" ");
writeByteBuffer(u8bb,3);
if (j%2 == 0) {
writeln();
} else {
writeString(" ");
}
}
writeFooter();
}
}
System.out.println("Number of GB characters worte: "+count);
}
public static void writeln() throws IOException {
out.write(0x0D);
out.write(0x0A);
}
public static void writeByte(byte b) throws IOException {
out.write(b & 0xFF);
}
public static void writeByteBuffer(ByteBuffer b, int l)
throws IOException {
int i = 0;
if (b==null) {
writeString("null");
i = 2;
} else {
for (i=0; i<b.limit(); i++) writeHex(b.get(i));
}
for (int j=i; j<l; j++) writeString(" ");
}
public static void writeGBSpace() throws IOException {
out.write(0xA1);
out.write(0xA1);
}
public static void writeString(String s) throws IOException {
if (s!=null) {
for (int i=0; i<s.length(); i++) {
out.write((int) (s.charAt(i) & 0xFF));
}
}
}
public static void writeNumber(int i) throws IOException {
String s = "00" + String.valueOf(i);
writeString(s.substring(s.length()-2,s.length()));
}
public static void writeHex(byte b) throws IOException {
out.write((int) hexDigit[(b >> 4) & 0x0F]);
out.write((int) hexDigit[b & 0x0F]);
}
public static void writeHeader() throws IOException {
writeString("<pre>");
writeln();
writeString("Q.W. ");
writeGBSpace();
writeString(" GB Uni. UTF-8 ");
writeString(" ");
writeString("Q.W. ");
writeGBSpace();
writeString(" GB Uni. UTF-8 ");
writeln();
writeln();
}
public static void writeFooter() throws IOException {
writeString("</pre>");
writeln();
}
public static boolean validGB(int i,int j) {
for (int l=0; l<b_out.length; l++) {
if (i*100+j>=b_out[l] && i*100+j<=e_out[l]) return false;
}
return true;
}
}