进行文件或目录的拷贝时，要先判断处理对象是文件还是目录，如果是文件则直接拷贝，如果是目录还需要拷贝它的子目录及其文件，这就需要递归处理了
import java.io.*;
class FileUtil{
private File srcFile;
private File desFile;
public FileUtil(String src, String des) {
this(new File(src),new File(des));
}
public FileUtil(File srcFile, File desFile) {
this.srcFile = srcFile;
this.desFile = desFile;
}
public boolean copy() throws Exception {
if(!srcFile.exists()) {
System.out.println("源文件不存在,文件拷贝失败");
return false;
}
return this.copyFileImpl(srcFile, desFile);//进行文件拷贝
}
public boolean copyDir() throws Exception {
this.copyImpl(this.srcFile);//对目录用递归处理
return true;
}
public void copyImpl(File file) throws Exception {//递归
if(file.isDirectory()) {//处理对象是目录，进行递归处理
File[] results = file.listFiles();
if(results != null) {
for(int i=0;i<results.length;i++) {
copyImpl(results[i]);
}
}
}else {//处理对象是文件，进行拷贝处理
String newFilePath = file.getPath().replace(this.srcFile.getPath()+File.separator, "");
File newFile = new File(this.desFile,newFilePath);//拷贝的目标路径
this.copyFileImpl(file, newFile);
}
}
public boolean copyFileImpl(File srcFile,File desFile) throws Exception {
if(!desFile.getParentFile().exists()) {
desFile.getParentFile().mkdirs();//创建父目录
}
InputStream input = null;
OutputStream output = null;
try {
input = new FileInputStream(srcFile);
output = new FileOutputStream(desFile);
byte[] data = new byte[1024];
int len = 0;
while((len = input.read(data)) != -1) {
output.write(data,0,len);
}
return true;
}catch(Exception e) {
throw e;
}finally {
if(input != null)
input.close();
if(output != null)
output.close();
}
}
}
public class FileCopyDemo {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
String src = "D:"+File.separator+"NBA";//源路径
String des = "D:"+File.separator+"NBA2";//目标路径
FileUtil fu = new FileUtil(src,des);
if(new File(src).isFile()) {
System.out.println("文件拷贝:"+fu.copy());//处理对象是文件，调用copy()方法
}else {
System.out.println("目录拷贝:"+fu.copyDir());//处理对象是目录，调用copyDir()方法
}
}
}