IO stream articles -- based on io stream to realize folder copy (copy subfolders and files in subfolders) full of dry goods

Title: To use IO stream to achieve folder copying, it is necessary to copy subfolders and files in subfolders.

Problem-solving idea: use recursion to realize folder copy, go in layer by layer to see if there is a file, if there is, perform the previous copy operation, so that it is achievedCopy folders and subfolders.

Not much to say, on the code:

public class FileCopy {

public static void main(String[] args) {
//Source file
String path = "C:/Users/Desktop/0611";
//Destination address
String path2 = "C:/Users/Desktop/0611(copy version)";
//Put the target path into the File class
File f2 = new File(path2);
//Detect the file pathWhether it exists, if not, create a folder to prevent the program from crashing due to a file not found exception
if (!f2.exists()) {
//Create a folder
f2.mkdirs();
}
//Call the method, pass in the actual parameters, and start copying the folder
copyFile(path, path2);
}

/**
* Copy files, copy subfolders and files recursively
* @param path1 Source file path
* @param path2 Destination file path
*/
public static void copyFile(String path1, String path2) {
File file = new File(path1);
File[] files = file.listFiles();
for (File file2:files) {
if (file2.isDirectory()) {
String newPath = path2 + File.separator + file2.getName();
File f2 = new File(newPath);
System.out.println(f2.getAbsolutePath());
f2.mkdirs();
System.out.println("created successfully~");
copyFile(file2.getAbsolutePath(), newPath);
}
if (file2.isFile()) {
try {
InputStream is = new FileInputStream(file2.getAbsolutePath());
int num = is.available();
byte[] bs = new byte[num];
OutputStream os = new FileOutputStream(path2 + File.separator + file2.getName());
int realLen = is.read(bs, 0, bs.length);
os.write(bs, 0, realLen);
System.out.println("Write successful~");
if (is != null) {
is.close();
}
if (os != null) {
os.close();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

}


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