What are byte streams?

What are byte streams?

1 package com. test; 2 3 import java. io. file; 4 import java. io. fileInputStream; 5 import java. io. fileNotFoundException; 6 import java. io. fileOutputStream; 7 import java. io. IOException; 8 import java. io. inputStream; 9 import java. io. outputStream; 10/** 11 * a stream is a set of sequential bytes with a starting point and a key point. It is a general term and abstract for data transmission. And data transmission between two devices is called a stream. 12 * the essence of a stream is data transmission. Based on the data transmission characteristics, the stream is abstracted into various types for more intuitive data operations. 13 * Data Processing type: byte stream and byte stream 14 * different flows: input stream and output stream 15 * @ author lcdn16 * 17 */18 public class TestByteSream {19/** 20 * bytes input stream: read data from a file into the program --- read 21 * InputStream class: this abstract class indicates the super class 22 of all classes of the byte input stream * obtain the input byte from a file in the file system using FileInputStream23 */24 public static void read () {25 File file = new File ("e: // B .txt"); 26 try {27 // create an input stream for the file 28 InputStream in = new FileInputStream (File ); 29 byte [] bytes = new byte [1024*1024]; // defines a byte array 30 int len =- 1; // the actual length of each read is 31 StringBuffer buf = new StringBuffer (); 32 while (len = in. read (bytes ))! =-1) {// indicates that there is readable data 33 buf. append (new String (bytes, 0, len); 34} 35 in. close (); 36 System. out. println (buf); 37} catch (FileNotFoundException e) {38 // TODO Auto-generated catch block39 e. printStackTrace (); 40} catch (IOException e) {41 // TODO Auto-generated catch block42 e. printStackTrace (); 43} 44} 45/** 46 * bytes output stream: output data from a program to a file --- write 47 * OutputStream class: this abstract class is the superclass of all classes that output byte streams. The output stream receives the output bytes and sends these bytes 48 * to a receiver of the InoutStream class.. 49 * output to the File using FileOutputStream50 */51 public static void write () {52 file File = new File ("e: // B .txt"); 53 if (! File. exists () {54 try {// file may not be written 55 file. createNewFile (); 56} catch (IOException e) {57 // TODO Auto-generated catch block58 e. printStackTrace (); 59} 60} else {61 try {62/*** 63 * Create an output stream for the file 64 * FileOutStream constructor. The second parameter "true" indicates that the data is written to the original file. data is not overwritten, 65 */66 OutputStream out = new FileOutputStream (file, true); 67 String info = "Android-based Java Article 2! "; 68 // write 69 out data to the file. write (info. getBytes (); 70 // close output stream 71 out. close (); 72} catch (FileNotFoundException e) {73 // TODO Auto-generated catch block74 e. printStackTrace (); 75} catch (IOException e) {76 // TODO Auto-generated catch block77 e. printStackTrace (); 78} 79} 80} 81 public static void main (String [] args) {82 // write (); 83 read (); 84} 85}