我的目标是在Netbeans中编写一个Java程序来复制目录及其所有内容，包括子目录及其内容。为此，我首先向用户询问要复制的源目录和目标目录。从这里开始，我的程序应该在新位置创建一个与源目录同名的新目录。然后，我的程序应该为源目录内容中的每个项目创建一个带有File类对象的数组。接下来，我尝试迭代数组，对于每一项—如果它是一个文件，它应该复制到新目录—如果它是一个目录，它应该递归地调用这个方法来复制目录及其所有内容。
一个非常有用的程序，如果我能让它正常工作的话。我现在很难理解使这个程序有效运行所需的整个逻辑。
当我运行程序时，它返回找不到文件，但这不是真的。所以我的代码一定是哪里出错了。如果有任何帮助，我将不胜感激。
谢谢。
package copydirectories;
/**
* CSCI 112, Ch. 18 Ex. 5
* @author zhughes3
* Last edited Tuesday, March 11th, 2014 @ 9pm
*/
import java.io.*;
import java.util.Scanner;
public class CopyDirectories {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws Exception {
//Create a new instance of scanner to get user input
Scanner scanner = new Scanner (System.in);
//Ask user to input the directory to be copied
System.out.print("Input directory to be copied.");
//Save input as String
String dirName = scanner.nextLine();
//Ask user to input destination where direction will be copied
System.out.print("Input destination directory will be moved to.");
//Save input as String
String destName = scanner.nextLine();
//Run method to determine if it is a directory or file
isDirFile(dirName, destName);
}//end main
public static void isDirFile (String source, String dest) throws Exception{
//Create a File object for new directory in new location with same name
//as source directory
File dirFile = new File (dest + source);
//Make the new directory
dirFile.mkdir();
//Create an array of File class objects for each item in the source
//directory
File[] entries;
//If source directory exists
if (dirFile.exists()){
//If the source directory is a directory
if (dirFile.isDirectory()){
//Get the data and load the array
entries = dirFile.listFiles();
//Iterate the array using alternate for statement
for (File entry : entries){
if (entry.isFile()){
copyFile (entry.getAbsolutePath(), dest);
} //end if
else {
isDirFile (entry.getAbsolutePath(), dest);
} //end else if
}//end for
}//end if
}//end if
else {
System.out.println("File does not exist.");
} //end else
}
public static void copyFile (String source, String dest) throws Exception {
//declare Files
File sourceFile = null;
File destFile = null;
//declare stream variables
FileInputStream sourceStream = null;
FileOutputStream destStream = null;
//declare buffering variables
BufferedInputStream bufferedSource = null;
BufferedOutputStream bufferedDest = null;
try {
//Create File objects for source and destination files
sourceFile = new File (source);
destFile = new File (dest);
//Create file streams for the source and destination
sourceStream = new FileInputStream(sourceFile);
destStream = new FileOutputStream(destFile);
//Buffer the file streams with a buffer size of 8k
bufferedSource = new BufferedInputStream(sourceStream,8182);
bufferedDest = new BufferedOutputStream(destStream,8182);
//Use an integer to transfer data between files
int transfer;
//Alert user as to what is happening
System.out.println("Beginning file copy:");
System.out.println("tCopying " + source);
System.out.println("tTo " + dest);
//Read a byte while checking for End of File (EOF)
while ((transfer = bufferedSource.read()) !=-1){
//Write a byte
bufferedDest.write(transfer);
}//end while
}//end try
catch (IOException e){
e.printStackTrace();
System.out.println("An unexpected I/O error occurred.");
}//end catch
finally {
//close file streams
if (bufferedSource !=null)
bufferedSource.close();
if (bufferedDest !=null)
bufferedDest.close();
System.out.println("Your files have been copied correctly and "
+ "closed.");
}//end finally
}//end copyDir
}//end class
如果您通读JavaDocs，您将看到mkdir…
创建以抽象路径名命名的目录。
这有点晦涩，但基本上，它只会创建目录的最后一层。例如，如果路径为C:thisisalongpath, mkdir将只尝试在C:thisisalong末尾创建path目录，但如果C:thisisalong不存在，它将失败。
相反，如果使用mkdirs
创建以抽象路径名命名的目录，包括任何必需但不存在的父目录。注意，如果操作失败时，可能已经成功创建了一些必要的父目录。
我还将检查这些方法的结果，因为它们将指示操作是否成功
我认为entries = dirFile.listFiles();看起来不对，你应该列出源目录的文件，而不是目标目录…