InputStreamReader isr = new InputStreamReader(new FileInputStream(inputPath), "GB2312");

        OutputStreamWriter osr = new OutputStreamWriter(new FileOutputStream(outPutPath), "GB2312");

        // 可以直接写入字符串/字符/字符数组等

        osr.write("xxxxx\r\n");

        // 单个字符读写

        int c;

        while ((c = isr.read()) != -) {

            osr.write(c);

        }

        // 字符数组读写

        char[] chs = new char[];

        int len;

        while ((len = isr.read(chs)) != -) {

            osr.write(chs, , len);

        }

        osr.close();

        isr.close();

        FileReader fr = new FileReader(inPutPath);

        FileWriter fw = new FileWriter(outPutPath);

        // 一次读写一个字符

        int ch;

        while ((ch = fr.read()) != -1) {

            fw.write(ch);

        }

        // 一次读写一个字符数组

        char[] chs = new char[1024];

        int len;

        while ((len = fr.read(chs)) != -1) {

            fw.write(chs, 0, len);

        }

        fr.close();

        fw.close();

        BufferedReader br = new BufferedReader(new FileReader(inPutPath));

        BufferedWriter bw = new BufferedWriter(new FileWriter(outPutPath));

        // 一次读写一个字符

        int ch;

        while ((ch = br.read()) != -1) {

            bw.write(ch);

        }

        // 一次读写一个字符数组

        char[] chs = new char[1024];

        int len;

        while ((len = br.read(chs)) != -1) {

            bw.write(chs, 0, len);

            bw.newLine();

            System.out.print(new String(chs, 0, len));

        }

        // 一次读写一行数据

        String line;

        while ((line = br.readLine()) != null) {

            bw.write(line);

            bw.newLine();

            bw.flush();//刷新数据

        }

        br.close();

        bw.close();