从文本文件中一行一行读的方法

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.io.Reader;public class insertCountry {/** * @param args */public static void main(String[] args) {try {File f = new File("D:/guojia.txt");FileReader fi = new FileReader(f);BufferedReader  fr = new BufferedReader(fi);try {String s = fr.readLine();System.out.println(s);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}