package com.dy.dyFile.util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;


public class FileUtil {
	
	protected static final Logger log = LogManager.getLogger(FileUtil.class.getName()) ;
	/**
	 * 保存文件
	 * @param fileAbsolutelyPath 文件绝对路径
	 * @param input
	 * @return 保存文件的是否成功的结果
	 */
	public boolean saveFile(String fileAbsolutelyPath , InputStream input){
		boolean success = true ;
		if(fileAbsolutelyPath == null || input == null){
			success = false ;
		}else{
			OutputStream os = null;
			try {
				os = new FileOutputStream(fileAbsolutelyPath);
				byte[] b = new byte[1024] ;
				int len = input.read(b) ;
				while(len > 0){
					os.write(b, 0, len);
					len = input.read(b) ;
					os.flush();
				}
			} catch (Exception e) {
				e.printStackTrace();
				success = false ;
			} finally {
				try {
					if(os != null){
						os.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return success ;
	}
	/**
	 * 复制文件
	 * @param fromFile
	 * @param realPath 绝对路径
	 * @param newFileRelativityPath 相对路径
	 * @return
	 */
	public boolean copyFile(File fromFile, String realPath, String newFileRelativityPath){
		boolean flag = true ;
		FileChannel fromChannel = null ;
		FileChannel toChannel = null ;
		try {
			fromChannel = new RandomAccessFile(fromFile, "r").getChannel();
			toChannel = new RandomAccessFile(new File(realPath + newFileRelativityPath), "rw").getChannel();
			fromChannel.transferTo(0, fromChannel.size(), toChannel);
		} catch (FileNotFoundException e) {
			flag = false ;
			log.error("复制文件出错:" + e.getMessage()) ;
		} catch (IOException e) {
			flag = false ;
			log.error("复制文件出错:" + e.getMessage()) ;
		}finally{
			try{
				if(fromChannel != null){
					fromChannel.close() ;
				}
				if(toChannel != null){
					toChannel.close() ;
				}
			}catch(Exception e){}finally{}
		}
		return flag ;
	}
	
	/**
	 * 删除文件
	 * @param f
	 */
	public boolean deleteFile(File f){
		boolean flag = false ;
		try{
			if(f != null){
				flag = f.delete() ;
			}
		}catch(Exception e){
		}finally{}
		return flag ;
	}
	
	/**
	 * 删除文件
	 * @param path
	 */
	public boolean deleteFile(String path){
		boolean flag = false ;
		try{
			if(path != null && !path.equals("")){
				File f = new File(path) ;
				if(f != null && f.exists()){
					flag = f.delete() ;
				}
			}
		}catch(Exception e){
		}finally{}
		return flag ;
	}

}