IO：缓冲

原理详解：http://ifeve.com/java-io-char-buffered-filter/

BufferedInputStream字节流输入缓冲：

void bufferedInputStream() {
        // BufferedInputStream带有缓冲区,多线程可见
        // 读取中文会乱码
        // 没有readLine()
        File file = new File("E:\abcdata.txt");
        InputStream inputStream = null;
        BufferedInputStream bis = null;
        byte[] b = new byte[1024];
        int len;
        StringBuilder sb = new StringBuilder();
        try {
            inputStream = new FileInputStream(file);
            bis = new BufferedInputStream(inputStream);
            while ((len = bis.read(b)) != -1) {
                String string = new String(b, 0, len, "UTF-8");
                sb.append(string);
            }
            System.out.println(sb);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }

BufferedOutputStream字节流输出缓冲：

void bufferedOutputStream() {
        File file = new File("E:\abcdata.txt");
        OutputStream outputStream = null;
        BufferedOutputStream bos = null;
        byte[] b = new byte[1024];
        String s = "测试输出！！";
        try {
            outputStream = new FileOutputStream(file, true);
            bos = new BufferedOutputStream(outputStream);
            b = s.getBytes();
            bos.write(b);
            // 刷新缓冲
            bos.flush();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

BufferedReader字符流输入缓冲：

void bufferedReader() {
        File file = new File("E:\test.txt");
        BufferedReader br = null;
        Reader reader = null;
        String string;
        StringBuilder sb = new StringBuilder();
        try {
            reader = new FileReader(file);
            br = new BufferedReader(reader);
            while ((string = br.readLine()) != null) {
                sb.append(string);
            }
            System.out.println(sb);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }

BufferedWriter字符流输出缓冲：

void bufferedWriter() {
        File file = new File("E:\test.txt");
        Writer writer = null;
        BufferedWriter bw = null;
        String string = "test 测试！！";
        try {
            writer = new FileWriter(file,true);
            bw = new BufferedWriter(writer);
            bw.write(string);
            bw.flush();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (bw != null) {
                try {
                    bw.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }