Java复制文件工具类

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.IOException;  
  
public class FileUtils {  
  
    public FileUtils() {  
        // TODO Auto-generated constructor stub  
    }  
    /** 
     * @warning The name of file must be end with .xls 
     * @param res The resource file 
     * @param des The destination 
     * @return  
     * @throws FileNotFoundException  
     */  
    public static boolean toCopy(String res,String des){  
        boolean flag=false;  
        Boolean bool1 = res.endsWith(".xxx");  
        Boolean bool2 = des.endsWith(".xxxb");  
          
        if(!bool1 && !bool2){  
            return false;  
        }  
        //输入源文件  
        File file = new File(res) ;  
        FileInputStream fr=null;  
        //复制目标文件  
        File desFile = new File(des);  
        FileOutputStream bw=null;  
        try {  
            fr = new FileInputStream(file);  
            bw = new FileOutputStream(desFile);  
              
            //buffer  
            byte[] b = new byte[512];  
            while(fr.read(b)!=-1){  
                bw.write(b);  
            }  
            bw.flush();  
            flag=true;  
        } catch (FileNotFoundException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }finally{  
            if(fr != null)  
                try {  
                    fr.close();  
                } catch (IOException e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                }  
            if(bw != null){  
                try {  
                    bw.close();  
                } catch (IOException e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                }  
            }  
        }  
        return flag;  
    }  
  
}