Jsoup，在执行表单POST之前获取值 [英] Jsoup, get value before executing form POST

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

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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