Question

我想使用HttpClient登录网站，登录后我想搜索某些内容并检索搜索结果的内容。

/**
 * A example that demonstrates how HttpClient APIs can be used to perform
 * form-based logon.
 */
public class TestHttpClient {

    public static void main(String[] args) throws Exception {

        DefaultHttpClient httpclient = new DefaultHttpClient();

        HttpGet httpget = new HttpGet("http://projecteuler.net/");

        HttpResponse response = httpclient.execute(httpget);
        HttpEntity entity = response.getEntity();

        System.out.println("Login form get: " + response.getStatusLine());
        if (entity != null) {
            entity.consumeContent();
        }
        System.out.println("Initial set of cookies:");
        List<Cookie> cookies = httpclient.getCookieStore().getCookies();
        if (cookies.isEmpty()) {
            System.out.println("None");
        } else {
            for (int i = 0; i < cookies.size(); i++) {
                System.out.println("- " + cookies.get(i).toString());
            }
        }

        HttpPost httpost = new HttpPost("http://projecteuler.net/index.php?section=login");

        List <NameValuePair> nvps = new ArrayList <NameValuePair>();
        nvps.add(new BasicNameValuePair("IDToken1", "username"));
        nvps.add(new BasicNameValuePair("IDToken2", "password"));

        httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));

        response = httpclient.execute(httpost);

        System.out.println("Response "+response.toString());
        entity = response.getEntity();

        System.out.println("Login form get: " + response.getStatusLine());
        if (entity != null) {

            InputStream is = entity.getContent();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String str ="";
            while ((str = br.readLine()) != null){
                System.out.println(""+str);
            }
        }

        System.out.println("Post logon cookies:");
        cookies = httpclient.getCookieStore().getCookies();
        if (cookies.isEmpty()) {
            System.out.println("None");
        } else {
            for (int i = 0; i < cookies.size(); i++) {
                System.out.println("- " + cookies.get(i).toString());
            }
        }
        httpclient.getConnectionManager().shutdown();        
    }
}

当我从HttpEntity打印输出时，它正在打印登录页面内容。使用HttpClient登录后如何获取页面内容？

Answer 1

该帖子应该模仿表单提交。无需先登录页面。如果我查看http://projecteuler.net，似乎表单已发布到index.php，所以我尝试更改帖子网址：

HttpPost httpost = new HttpPost("http://projecteuler.net/index.php");

使用类似Fire bug的内容来查看浏览器中发生的事情。也许你应该在登录后遵循重定向（HttpClient支持这一点）。似乎还有一个名为“login”的参数，其值为“Login”，正在发布。

HttpClient登录，搜索并获取XML内容

1 个答案: