如何从Java网站获取数据？

Question

我想在"http://www.aastocks.com/en/ltp/rtquote.aspx?symbol=01319“中获得”收益率“的值

我已经尝试过"Jsoup“，我的代码如下：

public static void main(String[] args) throws IOException {

    String url = "http://www.aastocks.com/en/ltp/rtquote.aspx?symbol=01319";
    Document document = Jsoup.connect(url).get();

    Elements answerers = document.select(".c3 .floatR ");
    for (Element answerer : answerers) {
        System.out.println("Answerer: " + answerer.data());
    }
    // TODO code application logic here
}

但它是空的。我该怎么做？

Answer 1

你的密码没问题。我亲自测试过。问题在于你使用的URL。如果我在浏览器中打开url，则值字段(例如收益率)为空。使用浏览器开发工具(网络选项卡)，您应该获得如下URL：

http://www.aastocks.com/en/ltp/RTQuoteContent.aspx?symbol=01319&process=y

使用这个URL会给出想要的结果。

Answer 2

最简单的解决方案是创建一个指向您想要的网页/链接的URL实例，使用流获取内容-

例如-

public static void main(String[] args) throws IOException 
{

    URL url = new URL("http://www.aastocks.com/en/ltp/rtquote.aspx?symbol=01319");

    // Get the input stream through URL Connection
    URLConnection con = url.openConnection();
    InputStream is =con.getInputStream();

    // Once you have the Input Stream, it's just plain old Java IO stuff.

    // For this case, since you are interested in getting plain-text web page
    // I'll use a reader and output the text content to System.out.

    // For binary content, it's better to directly read the bytes from stream and write
    // to the target file.


    BufferedReader br = new BufferedReader(new InputStreamReader(is));

    String line = null;

    // read each line and write to System.out
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
}

Answer 3

我认为珍汤在这方面是至关重要的。我不会怀疑一个有效的HTML文档(或其他什么)。