如何使用Java以编程方式登录Facebook？

Question

我正在尝试编写一个可以自动登录Facebook的Java程序。

到目前为止，我已经获得了下面的代码，可以将主页html页面下载到String中，但是不知道如何发送电子邮件和密码来登录Facebook？Java程序还需要处理返回的Cookie才能保持登录状态吗？

public static void main(String[] args) throws Exception {
        URL url = new URL("http://www.facebook.com/");
        URLConnection yc = url.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(yc
                .getInputStream()));
        String inputLine;
        String allInput = "";

        while ((inputLine = in.readLine()) != null) {

            allInput += inputLine + "\r\n";
        }
        System.out.println(allInput);

        in.close();
    }

}

更新：

我已经使用htmlUnit尝试了以下代码，但是出现以下异常：

Exception in thread "main" com.gargoylesoftware.htmlunit.ElementNotFoundException:     elementName=[form] attributeName=[name] attributeValue=[login_form] at com.gargoylesoftware.htmlunit.html.HtmlPage.getFormByName(HtmlPage.java:588)

有人知道为什么吗？

    final WebClient webClient = new WebClient();
    final HtmlPage page1 = webClient.getPage("http://www.facebook.com");
    final HtmlForm form = page1.getFormByName("login_form");

    final HtmlSubmitInput button = (HtmlSubmitInput) form.getInputsByValue("Login").get(0);
    final HtmlTextInput textField = form.getInputByName("email");
    textField.setValueAttribute("[e-mail]");
    final HtmlTextInput textField2 = form.getInputByName("pass");
    textField2.setValueAttribute("ahhhh");
    final HtmlPage page2 = button.click();

Answer 1

您应该看一下HTMLUnit，它比使用上面的要简单得多。以下页面和代码将指导您：

final WebClient webClient = new WebClient();
final HtmlPage page1 = webClient.getPage("http://www.facebook.com");
final HtmlForm form = page1.getFormByName("login_form");

final HtmlSubmitInput button = form.getInputsByValue("Log in");
final HtmlTextInput textField = form.getInputByName("email");
textField.setValueAttribute("[e-mail]");
final HtmlTextInput textField = form.getInputByName("pass");
textField.setValueAttribute("ahhhh");
final HtmlPage page2 = button.click();

http://htmlunit.sourceforge.net/gettingStarted.html