httpclient4模拟登陆问题，用OCR可以识别验证码，但是模拟post的时候总是说验证码有误，求帮忙

Question

import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.ImageIO;

import org.apache.http.Consts;
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.cookie.Cookie;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.asprise.util.ocr.OCR;

/**
 * @title: test2.java
 * @package
 * @description: TODO
 * @author caiyigo
 * @date 2012-9-15 下午9:17:59
 * @version v1.00
 */

public class test2 {
    public static void main(String[] args) throws Exception {

        DefaultHttpClient httpclient = new DefaultHttpClient();
        try {
            HttpGet httpget = new HttpGet(
                    "http://query.5184.com/query/image.jsp");

            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();
            System.out.println("获取验证码: " + response.getStatusLine());
            /* System.out.println(EntityUtils.toString(entity)); */
            InputStream is = entity.getContent();
            BufferedImage image = ImageIO.read(is);
            String imgcode = new OCR().recognizeEverything(image);

            System.out.println("n---- 验证码是: ------- n" + imgcode);

            HttpPost httpost = new HttpPost(
                    "http://query.5184.com/query/zk/zk_seat_2012_07.jsp");

            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            nvps.add(new BasicNameValuePair("name0", "010411201317"));
            nvps.add(new BasicNameValuePair("rand", imgcode));
            nvps.add(new BasicNameValuePair("serChecked", "on"));
            httpost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));

            response = httpclient.execute(httpost);
            entity = response.getEntity();
            System.out.println(EntityUtils.toString(entity));
            System.out.println("返回: " + response.getStatusLine());

            System.out.println(response.getProtocolVersion());

            System.out.println(response.getStatusLine().getStatusCode());

            System.out.println(response.getStatusLine().getReasonPhrase());

            EntityUtils.consume(entity);

        } finally {
           
            httpclient.getConnectionManager().shutdown();
        }
    }
}

Answer 1

应该是cookie的问题,get和post使用的不是同一个cookie

Answer 2

验证码识别后有一个空格，问题就在这里

Answer 3

首先把首页获取了来，然后再进一步获取验证码，主要是为了初始化Cookie;最好是给获取验证码的HttpGet加上Referer参数