国标GB2312编码自学教程 - v3.12,杨和荣
Warning: GB2312 encoding used!
从GB2312到Unicode转换表制作程式
本章介绍了GB2312Unicode.java源程序。它可以用来制作GB2312编码到Unicode编码转换 表。
本书列出的从GB2312编码到Unicode编码转换表由下面的程式所生成。这个程式采用了 Java内部编码转换函数CharsetDecoder.encode()和CharsetDecoder.decode(),
/* GB2312Unicde.java - Copyright (c) 2016, HerongYang.com, All Rights Reserved. */ 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("区位 "); writeGBSpace(); writeString(" GB Uni. UTF-8 "); writeString(" "); writeString("区位 "); 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; } }
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