关于HttpClient4.0的POST登录问题

Question

本帖最后由 qq355538000 于 2010-07-16 14:57:33 编辑

Answer 1

2010-7-16 15:10:53 org.apache.http.impl.client.DefaultRequestDirector execute
信息: I/O exception (org.apache.http.NoHttpResponseException) caught when processing request: The target server failed to respond
2010-7-16 15:10:53 org.apache.http.impl.client.DefaultRequestDirector execute
信息: Retrying request
2010-7-16 15:10:54 org.apache.http.impl.client.DefaultRequestDirector execute
信息: I/O exception (org.apache.http.NoHttpResponseException) caught when processing request: The target server failed to respond
2010-7-16 15:10:54 org.apache.http.impl.client.DefaultRequestDirector execute
信息: Retrying request
2010-7-16 15:10:54 org.apache.http.impl.client.DefaultRequestDirector execute
信息: I/O exception (org.apache.http.NoHttpResponseException) caught when processing request: The target server failed to respond
2010-7-16 15:10:54 org.apache.http.impl.client.DefaultRequestDirector execute
信息: Retrying request
Exception in thread "main" org.apache.http.NoHttpResponseException: The target server failed to respond
at org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:101)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:210)
at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:271)
at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:227)
at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:209)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:292)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:126)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:483)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554)
at framework.common.http.BaiduPost.main(BaiduPost.java:51)
捕着处理信息：目标服务器没有回应

Answer 2

会百度HTTPS登陆的麻烦给个HttpClient4.0的POST登录问题

Answer 3

tr id="vcodeTr" style="display:none;">
                <td class="f14" valign="top">验证码:</td>
                <td><input type="text" name="verifycode" class="ip" style="width:60px" maxlength="4"/>
                <br />
                <span class="fgy">请输入下面的字符</span><br />
                <img src="/?verifypic" width="100" height="40" id="verifypic" /> <a href="javascript:newverifypic();" title="看不清左边的字符">看不清?</a></td>        </tr>它在登录的时候是需要输入验证码的，而这个验证码是是一个图片的形式，你获取不到里面的字母数字，是没法用httpclient进行登录的

Answer 4

还有，页面的编码格式不是utf-8，是gb2312<meta http-equiv=content-type content="text/html; charset=gb2312">

Answer 5

之前网上找来的代码，我以前用4.0的时候也是那么郁闷，慢慢适应改变吧，不过我发现多看看4.0自带的例子很有帮助。
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
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.client.params.CookiePolicy;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.cookie.Cookie;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.HttpParams;/**
 * 使用httpclient4登陆百度
 * @author gohands
 *
 */
public class BaiduLogin {
   
    private static String URL_CHARACTER = "gb2312"; // 统一字符集
    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        //初始化
        DefaultHttpClient httpclient = new DefaultHttpClient();
        // 这一行必须要加，否则服务器无法获取登陆状态
        HttpClientParams.setCookiePolicy(httpclient.getParams(),CookiePolicy.BROWSER_COMPATIBILITY);        // 第一次访问
        String url = "http://www.baidu.com";
        HttpGet httpget = new HttpGet(url);
        HttpResponse response = httpclient.execute(httpget);
        System.out.println("Length1::" + response.getEntity().getContentLength());
        HttpEntity entity = response.getEntity();
        BaiduLogin.printEntity(entity);        // 使用POST方式登录
        HttpPost httpost = new HttpPost("http://passport.baidu.com/?login");
        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
        nvps.add(new BasicNameValuePair("username", "111"));
        nvps.add(new BasicNameValuePair("password", "111"));
        httpost.setEntity(new UrlEncodedFormEntity(nvps, BaiduLogin.URL_CHARACTER));        HttpParams params=httpclient.getParams();
        System.out.println(params.getParameter("username"));
        response = httpclient.execute(httpost);
        
        // 第二次访问
        System.out.println("\n----------------------------------------");
        System.out.println(response.getStatusLine());
        List<Cookie> cookies = httpclient.getCookieStore().getCookies();
        entity = response.getEntity();
        BaiduLogin.printEntity(entity);
        
        System.out.println("\n----------------------------------------");        cookies = httpclient.getCookieStore().getCookies();        System.out.println("cookies" + cookies.size());
        httpget = new HttpGet(url);
        // httpget.setr
        // httpget.setHeader(name, value)
        response = httpclient.execute(httpget);
        System.out.println("Length2::"
                + response.getEntity().getContentLength());
        entity = response.getEntity();
        BaiduLogin.printEntity(entity);
    }    /**
     * 输出entity内容，获取和输出返回的HTML文
     * @param entity
     * @throws IllegalStateException
     * @throws IOException
     */
    private static void printEntity(HttpEntity entity)
            throws IllegalStateException, IOException {        if (entity == null) {
            return;
        }
        System.out.println("HttpEntity start >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
        System.out.println("Response content length: " + entity.getContentLength());
        InputStream is = entity.getContent();
        BufferedReader in = new BufferedReader(new InputStreamReader(is));
        List<Byte> li = new ArrayList();
        int i;        //之所以写的如此复杂是因为了解决中文问题
        while ((i = is.read()) != -1) {
            li.add((byte) i);
        }
        byte a[] = new byte[li.size()];
        for (i = 0; i < a.length; i++) {
            a[i] = (byte) li.get(i);
        }
        System.out.println(new String(a, BaiduLogin.URL_CHARACTER)); // 打印HTML内容
        entity.consumeContent(); // entity销毁
        System.out.println("HttpEntity END >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
    }
}

Answer 6

HttpPost httpost = new HttpPost("http://passport.baidu.com/?login");    这行报错，提示没有这个方法httpclient 4.0