文件操作

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class TxtProcessor {

	public static void main(String[] args) throws IOException {

		String src = "src.txt";//源文件名
		String desc = "desc.txt";//新文件名
		
		BufferedReader bf = new BufferedReader(new FileReader(src));
		BufferedWriter bw = new BufferedWriter(new FileWriter(desc));
		
		String content = null;
		
		while((content = bf.readLine()) != null){
			String[] ary = content.trim().split("\\s+");
			
			StringBuilder sb = new StringBuilder();
			sb.append(ary[2]).append(" ");
			sb.append(ary[1]).append(" ");
			sb.append(ary[0]);
			
			bw.write(sb.toString());
			bw.newLine();
		}
		
		bf.close();
		bw.close();

	}

}