把文件复制到另一个地方

File filea=new File("C://temp//InventoryUnitShelf");                 //读取文件的路径
if ( ! filea.exists()){   
        return ;  
       } 
File fileb=new File(fileName_InventoryUnitShelf);               //保存文件的路径
if (filea.isFile()){  
            FileInputStream fis  =   null ;  
            FileOutputStream fos  = null ;  
             try  {  
                fis  =   new  FileInputStream(filea);  
                fos  =    new  FileOutputStream(fileb);  
                  
                byte [] bb  = new   byte [ ( int )filea.length()];  
                fis.read(bb);  
                fos.write(bb);  
 
            } catch  (IOException e){  
                e.printStackTrace();  
            } finally {  
                 try  {  
                    fis.close();  
                    fos.close();  
                }  catch  (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }