Jsoup，在执行表单POST之前获取值

问题描述

这是我用来提交表单的代码:

Here is code i am using to submit a form:

Connection.Response res = Jsoup.connect("http://example.com")
    .data("id", "myID")
    .data("username", "myUsername")
    .data("code", "MyAuthcode") // get the value of Auth code from page element
    .method(Method.POST).execute();

要成功提交给定的表单，带有[name ="code"]的字段需要设置一个值.

To submit the given form successfully, the field with [name="code"] needs to have a value set.

该值可以在页面上的另一个元素中找到.在实际提交如上所示的表单之前，如何使用相同的连接获取元素的值?

The value can be found on the page in another element. How on earth do I get the value of an element using the same connection, before actually submitting the form as shown above?

我需要使用元素中的值，才能成功填写表单.

I need to use a value from an element, to fill out the form successfully..

推荐答案

Jsoup实际上为每个请求打开了一个新的HTTP连接，因此您的询问不太可能，但是您可以关闭:

Jsoup actually opens a new HTTP connection for each request so what your asking isn't quite possible but you can get close:

// Define where to connect (doesn't actually connect)
Connection connection = Jsoup.connect("http://example.com");

// Connect to the server and get the page
Document doc = connection.get();

// Extract the value from the page
String authCode = doc.select("input[name='code']").val();

// Add the required data to the request
connection.data("id", "myID")
    .data("username", "myUsername")
    .data("code", authCode);

// Connect to the server and do a post
Connection.Response response = connection.method(Method.POST).execute();

这将在自己的连接上发出两个HTTP请求(每个分别用于GET和POST).

This would make two HTTP request (one each for the GET and the POST) each over there own connection.

如果您确实只想要一个连接，则必须使用其他工具连接到服务器(例如 Apache-HTTPClient ).您仍然可以使用jsoup来解析使用Jsoup.parse()返回的内容.

If you really want only one connection you'll have to use a different tool for connecting to the server (eg. Apache - HTTPClient). You would still be able to use jsoup to parse what you get back using Jsoup.parse().

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