Detailed explanation of Core :: IO framework in the java class library
Detailed explanation of Core :: IO framework in the java class library
Java is a popular programming language with a powerful class library and framework. One of them is Core :: IO framework.This framework provides many classes and methods for input and output operations, so that the Java program can easily process files and network data.
Core :: IO framework contains many important categories, the most important of which are InputStream and OutputStream.The inputStream class represents the input stream, which is mainly used to read data from data source (such as file or network connection).The OutputStream class represents the output stream and is used to write the data into the target position.
The following is a simple example that shows how to use the data and the OutputStream class to read the data from the file and write it into another file:
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileCopyExample {
public static void main(String[] args) {
try {
FileInputStream inputStream = new FileInputStream("input.txt");
FileOutputStream outputStream = new FileOutputStream("output.txt");
int character;
while ((character = inputStream.read()) != -1) {
outputStream.write(character);
}
inputStream.close();
outputStream.close();
System.out.println ("File replication is successful!"););
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above example, first created a FileInputStream object to read the file named "Input.txt".Then, a filetputstream object was created to write a file with data to "Output.txt".Read the data in the file by calling the Read () method of inputStream, and write the data into the target file by calling the WRITE () method of OutputStream.Finally, turn off the input and output stream.
In addition to the basic input and output operations, the Core :: IO framework also provides many other classes and methods for more advanced IO operations, such as processing buffer, character coding and serialization.
BufferedInputStream and BufferedOutPutStream are two commonly used classes to provide a buffer mechanism to improve read and write performance.They added stream buffer on the basis of InputStream and OutputStream.
The Charset class is used to represent the character set, which can be used to read and write data encoded in different characters.When dealing with Chinese files, appropriate character codes are usually required to ensure the correct reading and writing of the content of the file.
ObjectInputStream and ObjectOutPutstream are used for the serialization and derivativeization of the object. They can convert the Java object into byte flow for storage or transmission. It can also convert the byte flow back to the Java object.This is very useful for transmitting data in a distributed system or stored data in files.
In short, the Core :: IO framework in the Java class library provides a powerful input and output function, so that the Java program can easily process files and network data.To learn more about the Core :: IO framework, please refer to the Java official documentation or related tutorials.
