java - HttpClient HTTP/1.1 302 对象已移动

Question

此代码适用于我的简单测试登录表单。它使用 POST 登录，然后将所有信息从登录 View 打印到屏幕上。但它不适用于我一直在创建此代码的某个特定网站。有什么想法为什么会发生这种情况以及如何解决它吗？

package visualutopiabot;

import org.apache.http.client.ResponseHandler;
import org.apache.http.impl.client.BasicResponseHandler;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

    public class Main {

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

            DefaultHttpClient httpclient = new DefaultHttpClient();
            try {

                /* POST login */
                HttpPost httpost = new HttpPost("http://website.com/login.asp");

                List <NameValuePair> nvps = new ArrayList <NameValuePair>();
                nvps.add(new BasicNameValuePair("username", "nnnnick"));
                nvps.add(new BasicNameValuePair("password", "pppassswww123"));

                httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
                HttpResponse response = httpclient.execute(httpost);
                HttpEntity entity = response.getEntity();
                System.out.println("Login form get: " + response.getStatusLine());
                EntityUtils.consume(entity);

                /* get content*/
                HttpGet httpget = new HttpGet("http://website.com/index.asp");

                System.out.println("executing request " + httpget.getURI());

                // Create a response handler
                ResponseHandler<String> responseHandler = new BasicResponseHandler();
                String responseBody = httpclient.execute(httpget, responseHandler);
                System.out.println("----------------------------------------");
                System.out.println(responseBody);
                System.out.println("----------------------------------------");


            } finally {
                // When HttpClient instance is no longer needed,
                // shut down the connection manager to ensure
                // immediate deallocation of all system resources
                httpclient.getConnectionManager().shutdown();
            }
        }
    }

Answer 1

如果您使用 httpclient 3x

GetMethod默认情况下 followRedirects 标志设置为 true

您可以尝试将 PostMethod 显式设置重定向设置为 true

 PostMethod postMethod = ...;
 postMethod.setFollowRedirects(true)

如果您使用 httpcomponents

httpclient.setRedirectStrategy(new DefaultRedirectStrategy());
httpost.getParams().setParameter("http.protocol.handle-redirects",true);

参见http://hc.apache.org/httpcomponents-client-ga/tutorial/html/httpagent.html#d4e1192了解更多详情