文件流之文件输出流FileOutputStream_file转outputstream

package com.imooc.io;
 
import java.io.FileOutputStream;
import java.io.IOException;
 
public class FileOutDemo1 {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		//如果该文件不存在，则直接创建，如果存在，删除后创建
		FileOutputStream out = new FileOutputStream("demo/out.dat");
		out.write('A');//写出了'A'的低八位
		out.write('B');//写出了'B'的低八位
		int a = 10;//write只能写八位,那么写一个int需要些4次每次8位
		out.write(a >>> 24);
		out.write(a >>> 16);
		out.write(a >>> 8);
		out.write(a);
		byte[] gbk = "中国".getBytes("gbk");
		out.write(gbk);
		out.close();
		
		IOUtil.printHex("demo/out.dat");
	}
}

/**
	 * 文件拷贝，字节批量读取
	 * @param srcFile
	 * @param destFile
	 * @throws IOException
	 */
	public static void copyFile(File srcFile,File destFile)throws IOException{
		if(!srcFile.exists()){
			throw new IllegalArgumentException("文件:"+srcFile+"不存在");
		}
		if(!srcFile.isFile()){
			throw new IllegalArgumentException(srcFile+"不是文件");
		}
		FileInputStream in = new FileInputStream(srcFile);
		FileOutputStream out = new FileOutputStream(destFile);
		byte[] buf = new byte[8*1024];
		int b ;
	    while((b = in.read(buf,0,buf.length))!=-1){
	    	out.write(buf,0,b);
	    	out.flush();//最好加上
	    }
	    in.close();
	    out.close();
		
	}

package com.imooc.io;
 
import java.io.File;
import java.io.IOException;
 
public class IOUtilTest3 {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			IOUtil.copyFile(new File("e:\\javaio\\日记1.txt"), new File(
					"e:\\javaio\\日记2.txt"));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
	}
 
}