Principles of file processing technology in Apache Commons IO framework
Apache Commont IO is an open source Java class library that provides multiple tool classes for processing files and directory.It provides many commonly used file operation functions, such as file replication, file deletion, file renames, file read and write, etc.In this article, we will explore the principles of File processing technology in the Apache Commons IO framework and discuss related programming code and configuration.
1. File copy and delete
Apache Commons IO provides the FileUtils class that contains many static methods for file operations.The principle of file copying is to read the content of the source file and write it into the target file.The following is an example code for file copying:
import org.apache.commons.io.FileUtils;
public class FileCopyExample {
public static void main(String[] args) {
try {
FileUtils.copyFile(new File("source.txt"), new File("destination.txt"));
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above code, we use the CopyFile () method to copy the source file named Source.txt to the target file named Destination.txt.
The principle of file deleting is to delete the file from the file system by deleting the file.The following is an example code deleted by file:
import org.apache.commons.io.FileUtils;
public class FileDeleteExample {
public static void main(String[] args) {
try {
FileUtils.forceDelete(new File("file.txt"));
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above code, we use the forcedElete () method to delete files named File.txt.
2. File renamed
Apache Commons Io provides the Movefile () method in the FileUtils class for file renames.The principle of the file renamed is to move the source file to the path of the target file and rename it as the target file name.The following is a sample code named by a file:
import org.apache.commons.io.FileUtils;
public class FileRenameExample {
public static void main(String[] args) {
try {
FileUtils.moveFile(new File("oldName.txt"), new File("newName.txt"));
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above code, we use the Movefile () method to rename the source file named OldName.txt to name.txt.
3. File read and write
Apache Commons IO provides practical methods for InputStream and OutputStream for file reading and writing operations.The principle of file reading and writing is to read data through the input stream from the file, and use the output stream to write the data to the file.The following is a file read and write sample code:
import org.apache.commons.io.IOUtils;
public class FileReadWriteExample {
public static void main(String[] args) {
try {
String content = FileUtils.readFileToString(new File("file.txt"), StandardCharsets.UTF_8);
System.out.println("File Content: " + content);
String newContent = "This is a new content for the file.";
FileUtils.writeStringToFile(new File("file.txt"), newContent, StandardCharsets.UTF_8);
String updatedContent = FileUtils.readFileToString(new File("file.txt"), StandardCharsets.UTF_8);
System.out.println("Updated File Content: " + updatedContent);
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above code, we read the content from the file using the ReadFiletring () method, and write the new content to the file with the WritStringtofile () method.
In terms of configuration, Apache Commons IO does not require additional configuration.You only need to add its related jar package to the class path of the project, and then you can use the file processing function provided by it.
Summarize:
The Apache Commons IO framework provides many functions for processing files and directory.Its file processing technical principle is to realize file copying, delete, rename and read and write operations by reading and writing files.By using Apache Commons IO, we can make more convenient file processing operations and simplify our coding work.
