为什么在CharBuffer中得到的是乱码？

[Pinocchio_Garfield]

1、在学习中自己写了一个函数，读取文件的内容，并将其输出到控制台上，可是输出的总是乱码，请大家多多帮助！
2、源程序如下：
public static void read(String file){
try{
FileInputStream in =new FileInputStream("c:\\"+file+".txt");
FileChannel chan=in.getChannel();
Charset latin1 = Charset.forName("US-ASCII");
CharsetDecoder decoder = latin1.newDecoder();

ByteBuffer buffer=ByteBuffer.allocate(64);
while(true){
buffer.clear();
int num=chan.read(buffer);
System.out.println("Amount :"+num);

if(num==-1) break;
CharBuffer cb = decoder.decode(buffer );
while(cb.hasRemaining()){

System.out.println(cb.get());
}
}

}
catch(Exception e){
e.printStackTrace();
}
}

[masse]

try {
BufferedReader in = new BufferedReader(new FileReader("infilename"));
String str;
while ((str = in.readLine()) != null) {
System.out.println(str);
}
in.close();
} catch (IOException e) {
}

[hzhou]

Charset latin1 = Charset.forName("US-ASCII");
US-ASCII该成GB2312试试看?

[tommy_jk]

int num;
try{
FileInputStream fis =new FileInputStream("c:\\"+args[0]+".txt");
InputStreamReader isr = new InputStreamReader(fis,"GB2312");
BufferedReader br = new BufferedReader(isr);

while(true)
{
num = isr.read();
if(num == -1)
break;
System.out.print((char)num);

}
GBK和GB2312都可以.我用你的方法什么都显示不出来呀.