登陆人人网的代码，测试OK
package renren;import java.util.ArrayList;import java.util.List;import org.apache.http.Header;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.ResponseHandler;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.BasicResponseHandler;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HTTP;public class Login { private static String renRenLoginURL = "http://www.renren.com/PLogin.do"; private static String redirectURL = "http://www.renren.com/SysHome.do"; private static String userName = "**"; private static String password = "***"; private HttpResponse response; private DefaultHttpClient httpclient = new DefaultHttpClient(); public static void main(String[] args) { Login login = new Login(); login.printText(); } private boolean login() { HttpPost httpost = new HttpPost(renRenLoginURL); // All the parameters post to the web site List<NameValuePair> nvps = new ArrayList<NameValuePair>(); nvps.add(new BasicNameValuePair("origURL", redirectURL)); nvps.add(new BasicNameValuePair("domain", "renren.com")); nvps.add(new BasicNameValuePair("isplogin", "true")); nvps.add(new BasicNameValuePair("formName", "")); nvps.add(new BasicNameValuePair("method", "")); nvps.add(new BasicNameValuePair("submit", "登录")); nvps.add(new BasicNameValuePair("email", userName)); nvps.add(new BasicNameValuePair("password", password)); try { httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); response = httpclient.execute(httpost); } catch (Exception e) { e.printStackTrace(); return false; } finally { httpost.abort(); } return true; } private String getRedirectLocation() { Header locationHeader = response.getFirstHeader("Location"); if (locationHeader == null) { return null; } return locationHeader.getValue(); } private String getText(String redirectLocation) { HttpGet httpget = new HttpGet(redirectLocation); // Create a response handler ResponseHandler<String> responseHandler = new BasicResponseHandler(); String responseBody = ""; try { responseBody = httpclient.execute(httpget, responseHandler); } catch (Exception e) { e.printStackTrace(); responseBody = null; } finally { httpget.abort(); httpclient.getConnectionManager().shutdown(); } return responseBody; } public void printText() { if (login()) { String redirectLocation = getRedirectLocation(); if (redirectLocation != null) { System.out.println(getText(redirectLocation)); } } } }?