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Problems encountered in byte stream exercises and Solutions
2022-07-26 12:17:00 【Wang Xiaoya】
stem ：
Use byte stream and byte buffer stream respectively , Realize text file / picture / Copy of video files . And compare their efficiency in data replication （ Tips ： Date class
Test process and problems encountered ：
Mingming video is only short 3 second , Take up memory 1.25MB, But byte stream copy video often calculation method 2 ( Read and write one byte array at a time ) But with 7854 millisecond , There's something wrong ,
Later, the inspection revealed that
about 3 second 1.25MB In the video , The byte stream replication speed is as follows ：
Method 1 : Byte stream copy video is often calculated ( Read and write one byte at a time )
Total time consuming ：7645 millisecond
-----------
Method 2 : Byte stream copy video is often calculated ( Read and write one byte array at a time )
Total time consuming ：10 millisecond
-----------
Method 3 ： The byte buffer stream reads and writes one byte at a time
Total time consuming ：26 millisecond
-----------
Method four ： The byte buffer stream reads and writes one byte array at a time )
Total time consuming ：30 millisecond
Process ended , Exit code 0
Try to enlarge the video size to 20MB above ：
give the result as follows ：
Method 1 : Byte stream copy video is often calculated ( Read and write one byte at a time )
Total time consuming ：232989 millisecond
-----------
Method 2 : Byte stream copy video is often calculated ( Read and write one byte array at a time )
Total time consuming ：299 millisecond
-----------
Method 3 ： The byte buffer stream reads and writes one byte at a time
Total time consuming ：564 millisecond
-----------
Method four ： The byte buffer stream reads and writes one byte array at a time )
Total time consuming ：648 millisecond
Process ended , Exit code 0
Finally, the comparison results are obtained ：
Sort by output speed ：
Byte stream The frequent calculation of copying video ( Read and write one byte at a time Array ) > Byte buffer stream Read and write one at a time byte > Byte buffer stream Read and write one byte at a time Array > Byte stream The frequent calculation of copying video ( Read and write one at a time byte )
The complete code is as follows ：
package com.B.IOStream_14.IODemo;
import java.io.*;
//1.25MB3 Second video
//1. Use byte stream and byte buffer stream respectively , Realize text file / picture / Copy of video files .
// And compare their efficiency in data replication （ Tips ： Date class ）
public class A1Copymp4 {
public A1Copymp4() throws FileNotFoundException {
}
public static void main(String[] args) throws IOException {
// Record the start time
long startTime1 = System.currentTimeMillis();
// Copy video
// Call method 1 ：
time1();
System.out.println(" Method 1 : Byte stream copy video is often calculated ( Read and write one byte at a time )");
// Record the end time
long endTime1 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime1 - startTime1) + " millisecond ");
System.out.println("-----------");
// Call method 2 ：
long startTime2 = System.currentTimeMillis();
time2();
System.out.println(" Method 2 : Byte stream copy video is often calculated ( Read and write one byte array at a time )");
long endTime2 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime2 - startTime2) + " millisecond ");
System.out.println("-----------");
// Call method three ：
long startTime3 = System.currentTimeMillis();
time3();
System.out.println(" Method 3 ： The byte buffer stream reads and writes one byte at a time ");
long endTime3 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime3 - startTime2) + " millisecond ");
System.out.println("-----------");
// Call method four ：
long startTime4 = System.currentTimeMillis();
time4();
System.out.println(" Method four ： The byte buffer stream reads and writes one byte array at a time )");
long endTime4 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime4 - startTime2) + " millisecond ");
}
// Method 1 : Byte stream copy video is often calculated ( Read and write one byte at a time )
public static void time1() throws IOException {
// Create a byte input stream object from the data source
FileInputStream fis = new FileInputStream("D:\\ My document duck \\ Picture material \\ A young man in high spirits .mp4");
// Create a byte output stream object based on the destination
FileOutputStream fos = new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Is envy duck .mp4");
// Read and write data , Copy the picture ( Read one byte at a time , Write one byte at a time )
int by;
while ((by = fis.read()) != -1) {
fos.write(by);
}
// Release resources
fis.close();
fos.close();
}
// Method 2 : Byte stream copy video is often calculated ( Read and write one byte array at a time )
public static void time2() throws IOException {
// Create a byte input stream object from the data source
FileInputStream fis = new FileInputStream("D:\\ My document duck \\ Picture material \\ A young man in high spirits .mp4");
// Create a byte output stream object based on the destination
FileOutputStream fos = new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Is envy duck .mp4");
// Read and write data , Copy the picture ( Read one byte array at a time , Write one byte array at a time )
byte[] bys = new byte[1024];
int len;
while ((len = fis.read(bys)) != -1) {
fos.write(bys, 0, len);
}
// Release resources
fis.close();
fos.close();
}
// Method 3 ： The byte buffer stream reads and writes one byte at a time
public static void time3() throws IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\ My document duck \\ Picture material \\ A young man in high spirits .mp4"));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Is envy duck .mp4"));
// Read and write data , Copy the picture ( Read one byte at a time , Write one byte at a time )
int by;
while ((by = bis.read()) != -1) {
bos.write(by);
}
// Release resources
bos.close();
bis.close();
}
// Method four ： The byte buffer stream reads and writes one byte array at a time
public static void time4() throws IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\ My document duck \\ Picture material \\ A young man in high spirits .mp4"));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Is envy duck .mp4"));
// Read and write data , Copy the picture ( Read one byte array at a time , Write one byte array at a time )
byte[] bys = new byte[1024];
int len;
while ((len = bis.read(bys)) != -1) {
bos.write(bys, 0, len);
}
// Release resources
bos.close();
bis.close();
}
}
package com.B.IOStream_14.IODemo;
import java.io.*;
//11:02 Long ,37.5MB Big video
//1. Use byte stream and byte buffer stream respectively , Realize text file / picture / Copy of video files .
// And compare their efficiency in data replication （ Tips ： Date class ）
public class A1Copyavi {
public static void main(String[] args) throws IOException {
// Record the start time
long startTime1 = System.currentTimeMillis();
// Copy video
// Call method 1 ：
time1();
System.out.println(" Method 1 : Byte stream copy video is often calculated ( Read and write one byte at a time )");
// Record the end time
long endTime1 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime1 - startTime1) + " millisecond ");
System.out.println("-----------");
// Call method 2 ：
long startTime2 = System.currentTimeMillis();
time2();
System.out.println(" Method 2 : Byte stream copy video is often calculated ( Read and write one byte array at a time )");
long endTime2 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime2 - startTime2) + " millisecond ");
System.out.println("-----------");
// Call method three ：
long startTime3 = System.currentTimeMillis();
time3();
System.out.println(" Method 3 ： The byte buffer stream reads and writes one byte at a time ");
long endTime3 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime3 - startTime2) + " millisecond ");
System.out.println("-----------");
// Call method four ：
long startTime4 = System.currentTimeMillis();
time4();
System.out.println(" Method four ： The byte buffer stream reads and writes one byte array at a time ");
long endTime4 = System.currentTimeMillis();
System.out.println(" Total time consuming ：" + (endTime4 - startTime2) + " millisecond ");
}
// Method 1 : Byte stream copy video is often calculated ( Read and write one byte at a time )
public static void time1() throws IOException {
// Create a byte input stream object from the data source
FileInputStream fis = new FileInputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ video \\18_ Byte stream copy video .avi");
// Create a byte output stream object based on the destination
FileOutputStream fos = new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Teach me byte stream replication .avi");
// Read and write data , Copy the picture ( Read one byte at a time , Write one byte at a time )
int by;
while ((by = fis.read()) != -1) {
fos.write(by);
}
// Release resources
fis.close();
fos.close();
}
// Method 2 : Byte stream copy video is often calculated ( Read and write one byte array at a time )
public static void time2() throws IOException {
// Create a byte input stream object from the data source
// Create a byte input stream object from the data source
FileInputStream fis = new FileInputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ video \\18_ Byte stream copy video .avi");
// Create a byte output stream object based on the destination
FileOutputStream fos = new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Teach me byte stream replication .avi");
// Read and write data , Copy the picture ( Read one byte array at a time , Write one byte array at a time )
byte[] bys = new byte[1024];
int len;
while ((len = fis.read(bys)) != -1) {
fos.write(bys, 0, len);
}
// Release resources
fis.close();
fos.close();
}
// Method 3 ： The byte buffer stream reads and writes one byte at a time
public static void time3() throws IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ video \\18_ Byte stream copy video .avi"));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Teach me byte stream replication .avi"));
// Read and write data , Copy the picture ( Read one byte at a time , Write one byte at a time )
int by;
while ((by = bis.read()) != -1) {
bos.write(by);
}
// Release resources
bos.close();
bis.close();
}
// Method four ： The byte buffer stream reads and writes one byte array at a time
public static void time4() throws IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ video \\18_ Byte stream copy video .avi"));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("E:\\yangzhou\\ Back end level 8-16\\ checkpoint 14_ file IO flow \\02_ Byte stream \\ Homework \\Homework\\ Teach me byte stream replication .avi"));
// Read and write data , Copy the picture ( Read one byte array at a time , Write one byte array at a time )
byte[] bys = new byte[1024];
int len;
while ((len = bis.read(bys)) != -1) {
bos.write(bys, 0, len);
}
// Release resources
bos.close();
bis.close();
}
}
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