出现问题,然后想做一个单元测试，但是不知道‘登录’的单元测试怎么写，网上的单元测试太简单，比较难借鉴，请问，那位大神教教
出现问题,然后想做一个单元测试，但是不知道‘登录’的单元测试怎么写，网上的单元测试太简单，比较难借鉴，请问，那位大神教教

org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet jsp threw exception

java.lang.NullPointerException

at org.apache.jsp.left_jsp._jspService(left_jsp.java:105)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

at java.lang.Thread.run(Thread.java:619)

#LoginAction 代码#

package org.sx.action;



import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;



import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;



import org.apache.log4j.Logger;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import org.sx.dao.ObjectDao;

import org.sx.dto.TRole;

import org.sx.dto.TUser;



public class LoginAction extends DispatchAction {



ObjectDao objectDao;



public ObjectDao getObjectDao() {

return objectDao;

}



public void setObjectDao(ObjectDao objectDao) {

this.objectDao = objectDao;

}



public HttpSession session;

public Logger log = Logger.getRootLogger();



public ActionForward login(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {



System.out.println("-------开始验证用户信息------------");

log.info("进入登陆--LoginAction");

session = request.getSession();



TUser userinfor = (TUser) form;

// 取得账户信息

TUser user = (TUser) objectDao.getObjectForm("from TUser&nbs