处理二进制文件

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//----------------------------------------------------------------------------------
// Java's streams are binary at the lowest level if not processed with
// higher level stream mechanisms or readers/writers. Some additions
// to the Perl cookbook which illustrate the basics.

// Print first ten bytes of a binary file:
def dumpStart(filename) {
    bytes = new File(filename).newInputStream()
    10.times{
        print bytes.read() + ' '
    }
    println()
}
dumpStart(System.getProperty('java.home')+'/lib/rt.jar')
// => 80 75 3 4 10 0 0 0 0 0 (note first two bytes = PK - you might recognize this
// as the starting sequence of a zip file)
dumpStart('Pleac/classes/pleac8.class') // after running groovyc compiler in src directory
// => 202 254 186 190 0 0 0 47 2 20 (starting bytes in HEX: CAFEBABE)

binfile = new File('Pleac/data/temp.bin')
binfile.withOutputStream{ stream -> (0..<20).each{ stream.write(it) }}
binfile.eachByte{ print it + ' ' }; println()
// => 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
//----------------------------------------------------------------------------------

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