用文件类实现复制功能（并用正则表达式替换里面值）

/*
 * couter:苏奕祥
 * 实现两个文件的复制功能并且用到正则表达式替换复制完后的值
 * 
 */

import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
	public class CopyFile {
	 	public static void main(String[] args)throws IOException{
	 		File f=new File("E:\\sdx.txt");
	 		File f2=new File("E:\\sdxcopy.txt");
	 		Writer copy=new FileWriter(f2);
	 	    	Writer aaa=null;
	 	    	aaa=new FileWriter(f);
	 	    	aaa.write("I LOVE U I LOVE U I LOVE U\r\nI LOVE U I LOVE U I LOVE U\r\nI LOVE U I LOVE U I LOVE U");
	 	    	aaa.close();
		    
	 	    	Reader read=null;
	 	    	read=new FileReader(f);
	 	    	char c[]=new char[1024];
	 	    	int len=read.read(c);
	 	    	System.out.println(len);
	 	    	read.close();
	 	    	String str=new String(c,0,len);
	 	    	System.out.println("内容为："+str);
	 	
 			Pattern p=Pattern.compile("LOVE");
 			Matcher m=p.matcher(str);
	 		String str2=m.replaceAll("HATE");
			System.out.println(str2);
			copy.write(str2);
			copy.close();

 		
 	}	
}