java - 读取 URL 的前 5 行，然后以相反的顺序打印

Question

我想写一个简单的程序，读取 URL 的前五行，然后以相反的顺序打印出来，所以它是第 5 行、第 4 行、第 3 行、第 2 行、第 1 行。

这是我到目前为止所得到的:

public static void main(String[] arg) throws Exception {

    BufferedReader keyboard;
    String inputLine;

    keyboard = new BufferedReader(new InputStreamReader(System.in));

    System.out.print("Please enter the name of a company (without spaces): ");
    System.out.flush();        /* Make sure the line is printed immediately. */
    inputLine = keyboard.readLine();

    URL u = new URL("http://www." + inputLine + ".com/");
    InputStream ins = u.openStream();

    InputStreamReader isr = new InputStreamReader(ins);
    BufferedReader readURL = new BufferedReader(isr);

做我想做的事情最优雅的方法是什么？

Answer 1

取Reading Directly from a URL作为初始示例，因为它已经是一段优雅的代码，可以满足您的需求。例如……

import java.net.*;
import java.io.*;
import java.util.*;

public class DataURL {
    public static void main(String[] args) throws Exception {
        URL yahoo = new URL("http://www.yahoo.com/");
        BufferedReader in = new BufferedReader(
                new InputStreamReader(
                yahoo.openStream()));

        String inputLine;

        int i=5; /* number lines */
        List<String> lines = new ArrayList<String>();
        while (i>0 && (inputLine = in.readLine()) != null) {
            lines.add(inputLine);
            i--;
        }   
        in.close();

        for (i=lines.size()-1; i >= 0; i--) {
            System.out.println("Line " + i + ": " + lines.get(i));
        }   
    }   
}

这段代码只是简单地读取前五行，然后倒序输出。