public class StringReaderTest {
    public static void main(String[] args)
    {
        try
        {
            RandomAccessFile raf = new RandomAccessFile("/home/timing/test.txt","r");
            int a;
            int i=0;
            do
            {
                i++;
                a = raf.readChar();
                System.out.println(i + ":" + (char)a);
            }while(a != -1);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        
    }

}

public class StringReaderTest {
    public static void main(String[] args)
    {
        try
        {
            RandomAccessFile raf = new RandomAccessFile("/home/test/test.txt","r");
            int a;
            int i=0;
            String str;
            while(( str=raf.readLine())!=null){
                String strTemp =new String(
                        str.getBytes("ISO8859-1"),"UTF8");
                System.out.println(strTemp);
            }
        } catch(Exception e)
        {
            e.printStackTrace();
        }
        
    }

}

------解决方案--------------------
可能你文件是 GBK 的
Java code

        try {
            RandomAccessFile raf = new RandomAccessFile("/home/timing/test.txt", "r");
            byte[] bytes = new byte[2];
            long length = raf.length();
            for (long i=0; i<length; i++) {
                bytes[0] = raf.readByte();
                if (bytes[0] < 0) {
                    bytes[1] = raf.readByte(); i++;
                    System.out.print(new String(bytes));
                } else {
                    System.out.print((char)bytes[0]);
                }
            }
        } catch(Exception e) {
            e.printStackTrace();
        }