java - 从在线文本获取行不起作用 - 运行时出现错误

Question

我尝试从在线文本文件输入一些地址，但运行代码时出现我不明白的错误。

错误是:

Exception in thread "main" java.util.NoSuchElementException: No line found  
      at java.util.Scanner.nextLine(Unknown Source)  
    at Main.main(Main.java:20)  

我做错了什么？

我用浏览器打开了网址文本，它打开正确(问题不在于连接或链接)
我正在使用 Windows 命令提示符

import java.net.URL;
import java.util.Scanner;

class Address
{
    String street;
    String city;
    String state;
    int zip;
}

public class WebAddresses
{
    public static void main(String[] args) throws Exception
    {
        URL addys = new URL("http://cs.leanderisd.org/txt/fake-addresses.txt");
        Scanner fin = new Scanner( addys.openStream() );

        Address uno = new Address();
        uno.street = fin.nextLine();  //line 20
        uno.city   = fin.nextLine();
        uno.state  = fin.next();
        uno.zip    = fin.nextInt();
        fin.skip("\n");

        Address dos = new Address();
        dos.street = fin.nextLine();
        dos.city   = fin.nextLine();
        dos.state  = fin.next();
        dos.zip    = fin.nextInt();
        fin.skip("\n");

        Address tre = new Address();
        tre.street = fin.nextLine();
        tre.city   = fin.nextLine();
        tre.state  = fin.next();
        tre.zip    = fin.nextInt();
        fin.skip("\n");

        fin.close();

        System.out.println(uno.street + ", " + uno.city + ", " + uno.state + "  " + uno.zip);
        System.out.println(dos.street + ", " + dos.city + ", " + dos.state + "  " + dos.zip);
        System.out.println(tre.street + ", " + tre.city + ", " + tre.state + "  " + tre.zip);
    }
}

Answer 1

该 URL 返回 302“对象已移动”响应，将您重定向到安全协议(protocol)；请注意响应的 Location header 中的 https:

curl -v http://cs.leanderisd.org/txt/fake-addresses.txt

*   Trying 204.57.104.225...
* Connected to cs.leanderisd.org (204.57.104.225) port 80 (#0)
> GET /txt/fake-addresses.txt HTTP/1.1
> Host: cs.leanderisd.org
> User-Agent: curl/7.43.0
> Accept: */*
> 
< HTTP/1.1 302 Object Moved
< Date: Thu, 07 Apr 2016 20:13:01 GMT
< Connection: Keep-Alive
< Content-Length: 0
< Location: https://cs.leanderisd.org/txt/fake-addresses.txt
< 
* Excess found in a non pipelined read: excess = 1 url = /txt/fake-addresses.txt (zero-length body)
* Connection #0 to host cs.leanderisd.org left intact

您必须遵循重定向，如下所述:How to get redirected URL and content using HttpURLConnection

或者直接使用安全 URL:

https://cs.leanderisd.org/txt/fake-addresses.txt