import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileOperateDemo {
public static boolean copyGeneralFile(String srcPath, String destDir) {
boolean flag = false;
File file = new File(srcPath);
if(!file.exists()) { //The source file or folder does not exist
return false;
}
if(file.isFile()) { //Copying files
flag = copyFile(srcPath, destDir);
}
else if(file.isDirectory()) { //Folder copy
flag = copyDirectory(srcPath, destDir);
}
return flag;
}
public static boolean copyFile(String srcPath, String destDir) {
return copyFile(srcPath, destDir, true); //Overwrites the file with the same name by default
}
public static boolean copyDirectory(String srcPath, String destDir) {
return copyDirectory(srcPath, destDir, true);
}
public static boolean copyFile(String srcPath, String destDir, boolean overwriteExistFile) {
boolean flag = false;
File srcFile = new File(srcPath);
if (!srcFile.exists() || !srcFile.isFile()) { //The source file does not exist
return false;
}
//Gets the filename of the file to be copied
String fileName = srcFile.getName();
String destPath = destDir + File.separator +fileName;
File destFile = new File(destPath);
if (destFile.getAbsolutePath().equals(srcFile.getAbsolutePath())) { //The source file path and the destination file path overlap
return false;
}
if(destFile.exists() && !overwriteExistFile) { //There are files with the same name in the target directory and overwrite is not allowed
return false;
}
File destFileDir = new File(destDir);
if(!destFileDir.exists() && !destFileDir.mkdirs()) { //The directory does not exist and the directory creation failure returns directly
return false;
}
try {
FileInputStream fis = new FileInputStream(srcPath);
FileOutputStream fos = new FileOutputStream(destFile);
byte[] buf = new byte[1024];
int c;
while ((c = fis.read(buf)) != -1) {
fos.write(buf, 0, c);
}
fos.flush();
fis.close();
fos.close();
flag = true;
} catch (IOException e) {
e.printStackTrace();
}
return flag;
}
public static boolean copyDirectory(String srcPath, String destDir, boolean overwriteExistDir) {
if(destDir.contains(srcPath))
return false;
boolean flag = false;
File srcFile = new File(srcPath);
if (!srcFile.exists() || !srcFile.isDirectory()) { //The source folder does not exist
return false;
}
//Get the name of the folder to be copied. For example, if the folder to be copied is "E:\dir ", get the name "dir"
String dirName = srcFile.getName();
//The full path to the destination folder
String destDirPath = destDir + File.separator + dirName + File.separator;
File destDirFile = new File(destDirPath);
if(destDirFile.getAbsolutePath().equals(srcFile.getAbsolutePath())) {
return false;
}
if(destDirFile.exists() && destDirFile.isDirectory() && !overwriteExistDir) { //If the destination has a folder with the same name and overwriting is not allowed, then false is returned directly
return false;
}
if(!destDirFile.exists() && !destDirFile.mkdirs()) { //If the target directory does not exist and the directory creation failed
return false;
}
File[] fileList = srcFile.listFiles(); //Gets the subfiles and subfolders under the source folder
if(fileList.length==0) { //If the source folder is an empty directory, set the flag to true. This step is very subtle and has been debug for a long time
flag = true;
}
else {
for(File temp: fileList) {
if(temp.isFile()) { //file
flag = copyFile(temp.getAbsolutePath(), destDirPath, overwriteExistDir); //Recursive replication also inherits the override property
}
else if(temp.isDirectory()) { //file clip
flag = copyDirectory(temp.getAbsolutePath(), destDirPath, overwriteExistDir); //Recursive replication also inherits the override property
}
if(!flag) {
break;
}
}
}
return flag;
}
public static boolean deleteFile(String path) {
boolean flag = false;
File file = new File(path);
if (!file.exists()) { //file There is no direct return
return flag;
}
flag = file.delete();
return flag;
}
public static boolean cutGeneralFile(String srcPath, String destDir) {
boolean flag = false;
if(copyGeneralFile(srcPath, destDir) && deleteFile(srcPath)) { //Copy and delete were successful
flag = true;
}
return flag;
}
public static void main(String[] args) {
System.out.println(copyGeneralFile("d://test/test.html", "d://test/test/")); // Normal scenario
System.out.println(copyGeneralFile("d://notexistfile", "d://test/")); // Copy a file or folder that does not exist
System.out.println(copyGeneralFile("d://test/test.html", "d://test/")); // The files to be copied are in the same directory as the destination files
System.out.println(copyGeneralFile("d://test/test.html", "d://test/test/")); // Overwrite the file of the same name in the target directory
System.out.println(copyFile("d://test/", "d://test2", false)); // Does not overwrite a file of the same name in the target directory
System.out.println(copyGeneralFile("d://test/test.html", "notexist://noexistdir/")); // Copy files to a directory that cannot exist or be created
System.out.println("---------");
System.out.println(copyGeneralFile("d://test/", "d://test2/"));
System.out.println("---------");
System.out.println(deleteFile("d://a/"));
}
}