ConvertEncodingpublic class ConvertEncoding extends Object | A program to convert from one character encoding to another |
| Methods Summary |
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| public static void | convert(java.lang.String infile, java.lang.String outfile, java.lang.String from, java.lang.String to)
// Set up byte streams.
InputStream in;
if (infile != null) in = new FileInputStream(infile);
else in = System.in;
OutputStream out;
if (outfile != null) out = new FileOutputStream(outfile);
else out = System.out;
// Use default encoding if no encoding is specified.
if (from == null) from = System.getProperty("file.encoding");
if (to == null) to = System.getProperty("file.encoding");
// Set up character streams.
Reader r = new BufferedReader(new InputStreamReader(in, from));
Writer w = new BufferedWriter(new OutputStreamWriter(out, to));
// Copy characters from input to output. The InputStreamReader
// converts from the input encoding to Unicode, and the
// OutputStreamWriter converts from Unicode to the output encoding.
// Characters that cannot be represented in the output encoding are
// output as '?'
char[] buffer = new char[4096];
int len;
while((len = r.read(buffer)) != -1) // Read a block of input.
w.write(buffer, 0, len); // And write it out.
r.close(); // Close the input.
w.close(); // Flush and close output.
| | public static void | main(java.lang.String[] args)
String from = null, to = null;
String infile = null, outfile = null;
for(int i = 0; i < args.length; i++) { // Parse command-line arguments.
if (i == args.length-1) usage(); // All args require another.
if (args[i].equals("-from")) from = args[++i];
else if (args[i].equals("-to")) to = args[++i];
else if (args[i].equals("-in")) infile = args[++i];
else if (args[i].equals("-out")) outfile = args[++i];
else usage();
}
try { convert(infile, outfile, from, to); } // Attempt conversion.
catch (Exception e) { // Handle exceptions.
LocalizedError.display(e); // Defined at the end of this chapter.
System.exit(1);
}
| | public static void | usage()
System.err.println("Usage: java ConvertEncoding <options>\n" +
"Options:\n\t-from <encoding>\n\t" +
"-to <encoding>\n\t" +
"-in <file>\n\t-out <file>");
System.exit(1);
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