如何使用 Java 以编程方式登录 Facebook？

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，我已经得到了以下代码，可以将主页 html 页面下载到字符串中，但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 以保持登录状态吗？

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();
    }

}

Update:

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)

有谁知道这是为什么吗？

    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("[email protected] /cdn-cgi/l/email-protection");
    final HtmlTextInput textField2 = form.getInputByName("pass");
    textField2.setValueAttribute("ahhhh");
    final HtmlPage page2 = button.click();

您的代码存在一些问题

1. is that login_form不是表单名称而是表单 ID
2. 提交按钮值 iLog In
3. 密码字段的类型是HtmlPasswordInput

so:

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

final HtmlSubmitInput button = (HtmlSubmitInput) form.getInputsByValue("Log In").get(0);
final HtmlTextInput textField = form.getInputByName("email");
textField.setValueAttribute("[email protected] /cdn-cgi/l/email-protection");
final HtmlPasswordInput textField2 = form.getInputByName("pass");
textField2.setValueAttribute("ahhhh");
final HtmlPage page2 = button.click();