Java写文件乱码问题

写入文件的例子：

public static void main(String[] args) throws IOException {        // TODO Auto-generated method stub        File file = new File("/home/k/a");        OutputStreamWriter osw=new OutputStreamWriter(new FileOutputStream(file),"unicode");        BufferedWriter writer=new BufferedWriter(osw);        writer.write("12 add 34 equals 46");        writer.close();        System.out.println("write done.");    }

读取文件的例子：

public static void main(String[] args) throws IOException {        // TODO Auto-generated method stub        File file = new File("/home/k/a");        InputStreamReader isr=new InputStreamReader(new FileInputStream(file), "unicode");        BufferedReader reader=new BufferedReader(isr);        String s=reader.readLine();        System.out.println("s = "+s);        System.out.println("read done.");    }