使用BufferedReader对象的readLine()方法必须处理java.io.IOException异常(Exception).

一次可以读一行：

import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.IOException; 
public class ConsoleOutput { 
    public static void main(String arg[]) { 
        if(arg.length != 2) { 
            System.out.println("Usage: java CopyTextLines <infile> <outfile>"); 
            return; 
        } 
        try { 
            String str; 
            FileReader fr = new FileReader(arg[0]); 
            BufferedReader br = new BufferedReader(fr); 
            FileWriter fw = new FileWriter(arg[1]); 
            BufferedWriter bw = new BufferedWriter(fw); 
            while((str = br.readLine()) != null) 
                bw.write(str); 
            br.close(); 
            bw.close(); 
        } catch(IOException e) { 
            System.out.println(e); 
        } 
    } 
}

本文转自gnuhpc博客园博客，原文链接：http://www.cnblogs.com/gnuhpc/archive/2012/12/17/2822308.html，如需转载请自行联系原作者