java如何使用jsoup维护变量cookie和会话？

Question

public boolean isGood(String path)
{
    if (p != path)
    {
        good = false;
    }

    if (good)
    {
        try 
        {
            Connection connection = Jsoup.connect(path);
            Map<String, String> cookys = Jsoup.connect(path).response().cookies();

            if (cookys != cookies)
                cookies = cookys;

            for (Entry<String, String> cookie : cookies.entrySet()) 
            {
                connection.cookie(cookie.getKey(), cookie.getValue());
            }

            Doc = connection.get();
            good = true;
        }
        catch (Exception e) 
        {
            rstring = e.getMessage().toString();
            good = false;
        }
    }
    else
    {
        try
        {
            Response response = Jsoup.connect(path).execute();
            cookies = response.cookies();
            Doc = response.parse();
            good = true;
        }
        catch (Exception e) 
        {
            rstring = e.getMessage().toString();
            good = false;
        } 
    }       
    return good;
}

这种方法是不对的。我想弄明白的是，在不知道将存在哪些cookie的情况下，能够处理cookie更改以及维护会话

我正在为我的simple machines论坛编写一个应用程序，当你点击一些自定义行为时，它会更改cookie配置

但是，如果这个应用程序对我的网站很好的话，我会发布一个版本供其他人在其他论坛上使用

我知道我正朝着正确的方向前进，但逻辑是踢我的屁股

如有任何建议，将不胜感激

Answer 1

这段代码非常混乱。流程不合逻辑，异常处理不好。像if (p != path)和if (cookys != cookies)这样的对象引用比较毫无意义。要比较对象的内容，需要使用equals()方法

在这一点上，我理解您希望在同一个域上的一系列后续Jsoup请求中维护cookie。在这种情况下，您需要基本上遵循以下流程：

Map<String, String> cookies = new HashMap<String, String>();

// First request.
Connection connection1 = Jsoup.connect(url1);
for (Entry<String, String> cookie : cookies.entrySet()) {
    connection1.cookie(cookie.getKey(), cookie.getValue());
}
Response response1 = connection1.execute();
cookies.putAll(response1.cookies());
Document document1 = response1.parse();
// ...

// Second request.
Connection connection2 = Jsoup.connect(url2);
for (Entry<String, String> cookie : cookies.entrySet()) {
    connection2.cookie(cookie.getKey(), cookie.getValue());
}
Response response2 = connection2.execute();
cookies.putAll(response2.cookies());
Document document2 = response2.parse();
// ...

// Third request.
Connection connection3 = Jsoup.connect(url3);
for (Entry<String, String> cookie : cookies.entrySet()) {
    connection3.cookie(cookie.getKey(), cookie.getValue());
}
Response response3 = connection3.execute();
cookies.putAll(response3.cookies());
Document document3 = response3.parse();
// ...

// Etc.

这可以重构为以下方法：

private Map<String, String> cookies = new HashMap<String, String>();

public Document get(url) throws IOException {
    Connection connection = Jsoup.connect(url);
    for (Entry<String, String> cookie : cookies.entrySet()) {
        connection.cookie(cookie.getKey(), cookie.getValue());
    }
    Response response = connection.execute();
    cookies.putAll(response.cookies());
    return response.parse();
}

可以用作

YourJsoupWrapper jsoupWrapper = new YourJsoupWrapper();

Document document1 = jsoupWrapper.get(url1);
// ...

Document document2 = jsoupWrapper.get(url2);
// ...

Document document3 = jsoupWrapper.get(url3);
// ...

请注意，即将发布的JSoup1.6.2将附带一个新的Connection#cookies(Map)方法，这将使for循环每次都变得多余

Answer 2

巴卢斯克+1

我对你们的代码做了一些修改，它对我很有用，所以你们可以从网站上获取cookie，而不是获取文档

public Document get(String url) throws IOException {
    Connection connection = Jsoup.connect(url).userAgent("Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6");
    Connection.Response response = connection.execute();
    connection.cookies(response.cookies());
    return connection.get();
}