平台默认的打开首页的时候会从Cookie中获取bsessionid
第三方集成登录时不在跳转的首页地址后加username和password或者bsessionid参数就直接打开登录后的首页，可以在登录后把bsessionid放到Cookie中

实现登录的.j如下：

import java.io.IOException;
import java.sql.Date;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSONObject;
import com.justep.biz.client.ActionEngine;
import com.justep.biz.client.ActionResult;
import com.justep.biz.client.ActionUtils;


public class Login extends com.justep.ui.impl.JProcessorImpl  {
	public void execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		JSONObject content = null;
		String bsessionid = "";
		//从cookie中获取已有的bsessionid
		Cookie[] cookies = request.getCookies();
		if (cookies != null){
			for (int i = 0; i < cookies.length; i++) {
			  String name = cookies[i].getName();
			  if(name.equals("bsessionid")){
				  bsessionid = cookies[i].getValue();
			  }
			}
		}
		//判断bsessionid是否超时
		ActionResult checkResult = ActionEngine.checkSession(bsessionid, ActionUtils.JSON_CONTENT_TYPE);
		if (checkResult.isSessionTimeOut()) {
			String username = request.getParameter("username");
			String password = request.getParameter("password");
			String ip = request.getRemoteAddr();
			String language = "zh_CN";
			Date loginDate = new Date(System.currentTimeMillis());
			ActionResult actionResult = ActionEngine.login2(username, password, ip, language, loginDate, null, ActionUtils.JSON_CONTENT_TYPE, null);
			content = (JSONObject) actionResult.getContent();
			bsessionid = actionResult.getBSessionID();
			//把bsessionid放到Cookie中
			Cookie cookie = new Cookie("bsessionid",bsessionid);
			cookie.setMaxAge(-1);
			cookie.setPath("/");    
			response.addCookie(cookie);
		} else {
			content = (JSONObject) checkResult.getContent();
		}
		content.put("bsessionid", bsessionid);
		response.setCharacterEncoding("UTF-8");
		response.addHeader("Access-Control-Allow-Origin", "*");
		response.setContentType(ActionUtils.JSON_CONTENT_TYPE);
		response.sendRedirect("/x5/UI2/portal/pc3/index.w");  
		response.flushBuffer();
		
	}
}