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式是什么？

Answer 1

以Reading Directly from a URL为例，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));
        }   
    }   
}

此代码只读取前五行，然后以相反的顺序输出它们。

Answer 2

读入数组并在其上调用反向函数或递减循环。

读取URL的前5行，然后按相反顺序打印

2 个答案: