在javaIO中，文件的查询和删除，文件的复制程序如下：
普通的复制是：
public class Acopy {
public void copy(String oldpath,String newpath ) throws IOException {
File of = new File(oldpath);
File nf = new File(newpath);
if(!nf.exists()){
nf.createNewFile();
}
FileInputStream i = new FileInputStream(of);
FileOutputStream o = new FileOutputStream(nf);
int b= 0;
byte[] buffer = new byte[100];
while((b=i.read(buffer))!=-1){
o.write(buffer, 0, b-1);
}
i.close();
o.flush();
o.close();
}
}
加强的复制是：
public class Bcopy {
public void copy(String opath,String npath) throws IOException{
File of = new File(opath);
File nf = new File(npath);
if(!nf.exists()){
nf.createNewFile();
}
FileInputStream i = new FileInputStream(of);
BufferedInputStream bi = new BufferedInputStream(i);
FileOutputStream o = new FileOutputStream(nf);
BufferedOutputStream bo = new BufferedOutputStream(o);
int b = 0;
byte[] buffer = new byte[100];
while((b=bi.read(buffer))!=-1){
bo.write(buffer, 0, b-1);
}
bi.close();
bo.flush();
bo.close();
}
}
文件的查询是：
public void show(String path){
File f = new File(path);
if(f.isFile()){
System.out.println(f.getPath());
}else if(f.isDirectory()){
File[] files = f.listFiles();
if(files!=null){
for(File file : files){
if(file.isFile()){
System.out.println(file.getPath());
}else if(file.isDirectory()){
System.out.println("["+file.getPath()+"]");
show(file.getPath());
}
}
}
}
}
文件的删除是：
public void del(String path){
File f = new File(path);
if(f.isFile()){
f.delete();
}else if(f.isDirectory()){
File[] files = f.listFiles();
if(files.length==0){
f.delete();
}else if(files!=null){
for(File file : files){
if(file.isFile()){
file.delete();
}else if(file.isDirectory()){
del(file.getPath());
}
}
}
}
f.delete();
}