file1.java

项目实战

import java.io.*;
class file{
	public static void main(String []args){
		try{
		File f1=new File(args[0]);
		if(f1.exists()&&f1.isFile()){
			FileReader fr=new FileReader(f1);
			BufferedReader read=new BufferedReader(fr); 
			
			File f2=new File(args[1]);
			FileWriter fw=new FileWriter(f2);
			BufferedWriter write=new BufferedWriter(fw); 
			String s=new String();
			while((s=read.readLine())!=null){
				String ss=new String(s.toUpperCase());
				write.write(ss);
				write.newLine();
			}	
			read.close();
			write.close();
			
			/////////////////////
			f1=new File(args[1]);
			fr=new FileReader(f1);
			read=new BufferedReader(fr); 
			
			f2=new File(args[0]);
			fw=new FileWriter(f2);
			write=new BufferedWriter(fw);
			
			s=new String();
			while((s=read.readLine())!=null){
				write.write(s);
				write.newLine();
			}	
			read.close();
			write.close();
			f1.delete();
			
			
			////////////////////////////
			System.out.println("文件转换完成");
		}else{
			System.out.println("文件不存在或者是文件夹");
		}
			
		}catch(Exception ee){
			ee.printStackTrace();
		}		
	}
}