字符编码

输入中国怎么照样得到正确编码？
import java.io.*;
public class CharDecoder
{
    public static void main(String [] args) throws Exception
    {
        System.getProperties().put("file.encoding","iso8859-1");
        System.out.println("please enter a Chinese String");
        byte [] buf=new byte[1024];
        int ch=0;  
        int pos=0;
        String strInfo=null;
        while(true)
        {            
        ch =System.in.read();
        System.out.println(Integer.toHexString(ch));
        switch(ch)
        {
            case '\r':
                break;
            case '\n':
                strInfo= new String(buf,0,pos);
                for(int i=0;i<strInfo.length();i++)
                {
                    System.out.println(Integer.toHexString
                        (/*(int)*/strInfo.charAt(i)));
                }
                System.out.println(strInfo);//如输入中国怎么还能输出中国
                return;
            default:
                buf[pos++]=(byte)ch;
        }
        }            
    }
}

运行例子：
D:\>java CharDecoder
please enter a Chinese String
中国
d6
d0
b9
fa
d
a
4e2d
56fd
中国
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