IO：缓冲

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

BufferedInputStream字节流输入缓冲：

 1 void bufferedInputStream() {
 2         // BufferedInputStream带有缓冲区,多线程可见
 3         // 读取中文会乱码
 4         // 没有readLine()
 5         File file = new File("E:\\abcdata.txt");
 6         InputStream inputStream = null;
 7         BufferedInputStream bis = null;
 8         byte[] b = new byte[1024];
 9         int len;
10         StringBuilder sb = new StringBuilder();
11         try {
12             inputStream = new FileInputStream(file);
13             bis = new BufferedInputStream(inputStream);
14             while ((len = bis.read(b)) != -1) {
15                 String string = new String(b, 0, len, "UTF-8");
16                 sb.append(string);
17             }
18             System.out.println(sb);
19         } catch (FileNotFoundException e) {
20             // TODO Auto-generated catch block
21             e.printStackTrace();
22         } catch (IOException e) {
23             // TODO Auto-generated catch block
24             e.printStackTrace();
25         } finally {
26             if (bis != null) {
27                 try {
28                     bis.close();
29                 } catch (IOException e) {
30                     // TODO Auto-generated catch block
31                     e.printStackTrace();
32                 }
33             }
34         }
35
36     }

BufferedOutputStream字节流输出缓冲：

 1 void bufferedOutputStream() {
 2         File file = new File("E:\\abcdata.txt");
 3         OutputStream outputStream = null;
 4         BufferedOutputStream bos = null;
 5         byte[] b = new byte[1024];
 6         String s = "测试输出！！";
 7         try {
 8             outputStream = new FileOutputStream(file, true);
 9             bos = new BufferedOutputStream(outputStream);
10             b = s.getBytes();
11             bos.write(b);
12             // 刷新缓冲
13             bos.flush();
14         } catch (FileNotFoundException e) {
15             // TODO Auto-generated catch block
16             e.printStackTrace();
17         } catch (IOException e) {
18             // TODO Auto-generated catch block
19             e.printStackTrace();
20         } finally {
21             if (bos != null) {
22                 try {
23                     bos.close();
24                 } catch (IOException e) {
25                     // TODO Auto-generated catch block
26                     e.printStackTrace();
27                 }
28             }
29         }
30     }

BufferedReader字符流输入缓冲：

 1 void bufferedReader() {
 2         File file = new File("E:\\test.txt");
 3         BufferedReader br = null;
 4         Reader reader = null;
 5         String string;
 6         StringBuilder sb = new StringBuilder();
 7         try {
 8             reader = new FileReader(file);
 9             br = new BufferedReader(reader);
10             while ((string = br.readLine()) != null) {
11                 sb.append(string);
12             }
13             System.out.println(sb);
14         } catch (FileNotFoundException e) {
15             // TODO Auto-generated catch block
16             e.printStackTrace();
17         } catch (IOException e) {
18             // TODO Auto-generated catch block
19             e.printStackTrace();
20         } finally {
21             if (br != null) {
22                 try {
23                     br.close();
24                 } catch (IOException e) {
25                     // TODO Auto-generated catch block
26                     e.printStackTrace();
27                 }
28             }
29         }
30
31     }

BufferedWriter字符流输出缓冲：

 1 void bufferedWriter() {
 2         File file = new File("E:\\test.txt");
 3         Writer writer = null;
 4         BufferedWriter bw = null;
 5         String string = "test 测试！！";
 6         try {
 7             writer = new FileWriter(file,true);
 8             bw = new BufferedWriter(writer);
 9             bw.write(string);
10             bw.flush();
11         } catch (IOException e) {
12             // TODO Auto-generated catch block
13             e.printStackTrace();
14         } finally {
15             if (bw != null) {
16                 try {
17                     bw.close();
18                 } catch (IOException e) {
19                     // TODO Auto-generated catch block
20                     e.printStackTrace();
21                 }
22             }
23         }
24
25     }