stringiocopy.java

java课程的资料以及实验的代码

import java.io.*;
public class StringIOCopy

{
	public static void copyfile(FileReader in,FileWriter out)
	throws IOException
	{
		try
		{
			while((in.read())!=-1)
			{
				out.write(in.read());
			}
		}
		catch(EOFException eof)
		{
			return ;
		}
	}
	public static void main(String args[])
	{
		if(args.length!=2)
		{
			System.out.println("Notice:This is java copy program sourceFile to targetFile ");
			System.out.println("you have to fill two string only!");			
		}
		else 
		{
			String inFileName=args[0],outFileName=args[1];
			File inFile=new File(inFileName);
			File outFile=new File(outFileName);
			if(!inFile.exists())			
			System.out.println(inFileName+"does not exist!");
			else if(outFile.exists())
			System.out.println(outFileName+"already exist!");
			else
			{
				try{
						FileReader in=new FileReader(inFileName);
						FileWriter out=new FileWriter(outFileName);
					    copyfile(in,out);
						in.close();
						out.close();
					}
					catch(IOException ioe)
					{
						ioe.printStackTrace();
					}
			}
		}
	}
	
}