Explore the internal mechanism of Core :: IO framework in the Java class library
The Core :: IO framework in the Java class library is an important component for processing input and output operations.It provides many categories and methods for reading and writing data, processing files and directory, and processing network connections.
Core :: IO Framework internal mechanism based on flow -based concept.Streaming is a way to read or write data in order.It can be byte flow (processing binary data) or character stream (processing text data).
Java's Core :: IO framework contains many streamlined classes to handle various scenarios and data types.Here are some commonly used streams:
1. InputStream and OutputStream: Used to process byte flow, you can read the byte from the input stream, or write the byte into the output stream.
2. Reader and Writer: Used to process character streams, you can read characters from the input stream, or write the characters into the output stream.
3. BufferedInputStream and BufferedOutPutstream: Used to provide byte streams with buffer functions, which can improve read and write performance.
4. BufferedReader and BufferedWriter: Used to provide character streams with buffer functions, which can improve read and write performance.
In addition to the basic streaming class, Core :: IO framework also provides many other classes and methods to process files and directory operations, as well as the operation of network connection.Here are some commonly used categories and methods:
1. FILE class: It is used to represent the abstract path name of the file or directory, and the operation of files and directory can be created, deleted, and renamed.
2. FileInputStream and FileoutPutStream: The byte flow for processing files can be read or written to the bytes in the file.
3. FileReader and FileWriter: The character stream used to handle files can be read or written into the characters in the file.
4. RandomaccessFile: For data in random access to the file, you can read or write any position in the file.
5. Socket and Serversocket: Used to handle network connections, you can create sockets on the client and server side and conduct network communication.
Now let's take a look at some Java code examples to demonstrate the use of Core :: IO framework:
1. Use InputStream and OUTPUTSTREAM to read and write byte flow:
try (InputStream input = new FileInputStream("input.txt");
OutputStream output = new FileOutputStream("output.txt")) {
int data;
while ((data = input.read()) != -1) {
output.write(data);
}
} catch (IOException e) {
e.printStackTrace();
}
2. Read and write character streams with bufferedReader and bufferedwriter:
try (BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
BufferedWriter writer = new BufferedWriter(new FileWriter("output.txt"))) {
String line;
while ((line = reader.readLine()) != null) {
writer.write(line);
writer.newLine();
}
} catch (IOException e) {
e.printStackTrace();
}
3. Use the File class to perform files and directory operations:
File file = new File("example.txt");
if (file.exists()) {
System.out.println("File exists");
} else {
System.out.println("File does not exist");
}
File directory = new File("mydir");
if (directory.mkdirs()) {
System.out.println("Directory created");
} else {
System.out.println("Failed to create directory");
}
File renamedFile = new File("newname.txt");
if (file.renameTo(renamedFile)) {
System.out.println("File renamed");
} else {
System.out.println("Failed to rename file");
}
The above is some basic concepts and examples of the Core :: IO framework.By understanding these classes and methods in depth, you can better use the Core :: IO framework in the Java class library to process the input and output operation.
