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package IO_04;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;//复制单级文件夹public class CopyFolderDemo {	public static void main(String[] args) throws IOException {		File srcFolder = new File("demo");		File destFolder = new File("dest");				if(!destFolder.exists()){			destFolder.mkdir();		}		File[] fileArr = srcFolder.listFiles();		for(File f: fileArr){			File newFile = new File(destFolder, f.getName());			copyFile(f, newFile);		}	}		private static void copyFile(File srcFile, File destFile) throws IOException{		BufferedInputStream br = new BufferedInputStream(new FileInputStream(srcFile));		BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream(destFile));			byte[] buf = new byte[1024];		int len = 0;		while((len=br.read(buf))!=-1){			bo.write(buf, 0, len);			bo.flush();		}				br.close();		bo.close();	}}

package IO_05;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FilenameFilter;import java.io.IOException;//需求：复制指定目录下的指定文件，并修改后缀名。public class CopyFolderDemo {	public static void main(String[] args) throws IOException {		File srcFolder = new File("demo");		File destFolder = new File("dest");				if(!destFolder.exists()){			destFolder.mkdir();		}		File[] fileArr = srcFolder.listFiles(new FilenameFilter() {						@Override			public boolean accept(File dir, String name) {				return new File(dir, name).isFile() && name.endsWith(".txt");			}		});		for(File f: fileArr){			File destFile = new File(destFolder, f.getName());						copyFile(f, destFile);		}				File[] destArr = destFolder.listFiles();		for(File f: destArr){			String name = f.getName();			String newName = name.replace(".txt", ".java");						File newFile = new File(destFolder,newName);			f.renameTo(newFile);		}	}		private static void copyFile(File srcFile, File destFile) throws IOException{		BufferedInputStream br = new BufferedInputStream(new FileInputStream(srcFile));		BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream(destFile));			byte[] buf = new byte[1024];		int len = 0;		while((len=br.read(buf))!=-1){			bo.write(buf, 0, len);			bo.flush();		}				br.close();		bo.close();	}}

package IO_06;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;//copy多级目录public class CopyFolderDemo {	public static void main(String[] args) throws IOException {		File srcFolder = new File("demo");		File destFolder = new File("dest");		if(!destFolder.exists()){			destFolder.mkdir();		}				copyFolder(srcFolder,destFolder);			}		private static void copyFolder(File srcFolder, File destFolder) throws IOException{		File[] srcFile = srcFolder.listFiles();				for(File f:srcFile){			if(f.isDirectory()){				File destFile = new File(destFolder,f.getName());				destFile.mkdir();				copyFolder(f, destFile);			}else{				File destFile = new File(destFolder,f.getName());				copyFile(f, destFile);			}		}	}		private static void copyFile(File srcFile, File destFile) throws IOException{		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(srcFile));		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destFile));				byte[] buf = new byte[1024];		int len = 0;		while((len = bis.read(buf))!=-1){			bos.write(buf,0,len);			bos.flush();		}		bis.close();		bos.close();	}}

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