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参考:https://www.codejava.net/java-se/file-io/how-to-read-and-write-binary-files-in-java
this is a very important image for all .
1. Reading and Writing Binary Files Using FileInputStream and FileOutputStream
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String inputFile="C:\\Users\\Administrator\\Desktop\\test.pcm";
String outputFile="C:\\Users\\Administrator\\Desktop\\test_result.pcm";
InputStream inputStream=new FileInputStream(inputFile);
OutputStream outputStream=new FileOutputStream(outputFile);
int byteRead;
while((byteRead=inputStream.read()) != -1){
outputStream.write(byteRead);
}
inputStream.close();
outputStream.close();
return;
}
And the following program runs much faster by copying a chunk of bytes at a time (exactly 4096 bytes at a time):
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String inputFile="C:\\Users\\Administrator\\Desktop\\test.pcm";
String outputFile="C:\\Users\\Administrator\\Desktop\\test_result.pcm";
InputStream inputStream=new FileInputStream(inputFile);
OutputStream outputStream=new FileOutputStream(outputFile);
long fileSize=new File(inputFile).length();
System.out.println(fileSize);
byte[] allBytes = new byte[(int) fileSize]; //存疑。
inputStream.read(allBytes);
outputStream.write(allBytes);
inputStream.close();
outputStream.close();
return;
}
2. Reading and Writing Binary Files Using BufferedInputStream and BufferedOutputStream
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String inputFile="C:\\Users\\Administrator\\Desktop\\test.pcm";
String outputFile="C:\\Users\\Administrator\\Desktop\\test_result.pcm";
// also.
// int bufferSize = 16384; // 16KB buffer size
// InputStream inputStream
// = new BufferedInputStream(new FileInputStream(inputFile), bufferSize);
//
// OutputStream outputStream
// = new BufferedOutputStream(new FileOutputStream(outputFile), bufferSize);
InputStream inputStream=new BufferedInputStream(new FileInputStream(inputFile));
OutputStream outputStream=new BufferedOutputStream(new FileOutputStream(outputFile));
int BUFFER_SIZE = 16384;
byte[] buffer=new byte[BUFFER_SIZE];
while (inputStream.read(buffer) != -1){
outputStream.write(buffer);
}
inputStream.close();
outputStream.close();
return;
}
3.Reading and Writing Binary Files Using New File I/O API (NIO)
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String inputFile="C:\\Users\\Administrator\\Desktop\\test.pcm";
String outputFile="C:\\Users\\Administrator\\Desktop\\test_result.pcm";
byte[] allBytes=Files.readAllBytes(Paths.get(inputFile));
Files.write(Paths.get(outputFile), allBytes);
return;
}