FileInputStream BufferedInputStream 使用

看代碼就知道什麼情況了

public class Ch1 {
    public static void main(String[] args) throws Exception {
        FileInputStream fis = new FileInputStream("D:\\IdeaProjects\\webkaola\\alter.sql");
        BufferedInputStream bis = new BufferedInputStream(fis);
//        BufferedReader br = getBufferedReader(bis);
//        getBuffer(bis);
//        br.close();
//        getRead1(bis);
//        getRead(bis);
        bis.close();
        fis.close();
    }

    /**
     * read(byte[]) 演示 編碼設置問題
     *
     * @param bis
     * @throws IOException
     */
    private static void getRead1(BufferedInputStream bis) throws IOException {
        byte[] buffer = new byte[1024];
        int read = bis.read(buffer);
        StringBuilder sb = new StringBuilder();
        while (read != -1) {
            sb.append(new String(buffer, "iso-8859-1"));
            read = bis.read(buffer);
        }
        System.out.println(new String(sb.toString().getBytes("iso-8859-1"), "GBK"));
    }

    /**
     * read(byte[],off,len) 演示 編碼設置問題
     *
     * @param bis
     * @throws IOException
     */
    private static void getRead(BufferedInputStream bis) throws IOException {
        byte[] buffer = new byte[1024];
        StringBuilder stringBuilder = new StringBuilder();
        while (bis.read(buffer, 0, buffer.length) != -1) {
            stringBuilder.append(new String(buffer, "iso-8859-1"));
        }
        System.out.println(new String(stringBuilder.toString().getBytes("iso-8859-1"), "GBK"));
    }

    /**
     * 演示一次性讀取完 read(byte[bis.available()]) 編碼設置問題
     *
     * @param bis
     * @throws IOException
     */
    private static void getBuffer(BufferedInputStream bis) throws IOException {
        byte[] byteChar = new byte[bis.available()];
        bis.read(byteChar);
        System.out.println(new String(new String(byteChar, "iso-8859-1").getBytes("iso-8859-1"), "GBK"));
    }

    /**
     * 演示通過BufferedReader一行一行的讀取 編碼設置問題
     *
     * @param bis
     * @return
     * @throws IOException
     */
    private static BufferedReader getBufferedReader(BufferedInputStream bis) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(bis, "iso-8859-1"));
        String s;
        StringBuilder sb = new StringBuilder();
        while ((s = br.readLine()) != null) {
            sb.append(s).append("\n");
        }
        System.out.println(new String(sb.toString().getBytes("iso-8859-1"), "GBK"));
        return br;
    }
}