解决struts2接收不到页面传递过来的对象VO的问题

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本人最近利用struts2+ibatis+spring框架搭建web项目，需要写一个登录页面。众所周知，需要把JSP中输入的用户名、密码传递给后台action处理，判断用户名密码是否正确。其中会遇到很多action接收不到JSP页面传值而无法完成交互的问题，因此可以进行一一排查：

LoginAction:

private PortalUserVO portalUserVO;private UserService userService;private static final String LOGIN_VIEW = "login";private static final String LOGIN_SUCCESS = "success";private static final String LOGIN_FAILED = "login";public String doLoginView() {return LOGIN_VIEW;}public String doLogin() {String status = LOGIN_SUCCESS;String loginId = portalUserVO.getLoginId();String loginPasswd = portalUserVO.getPasswd();if(loginId == null || "".equals(loginId)) {errorMsg = "登录的用户名不能为空!";status = LOGIN_VIEW;}if(loginPasswd == null || "".equals(loginPasswd)) {errorMsg = "登录的用户密码不能为空!";status = LOGIN_VIEW;}try {PortalUserVO userVO = userService.getPortalUserByLoginId(portalUserVO.getLoginId());if(userVO == null) {errorMsg = "用户不存在，请检查输入!";status = LOGIN_FAILED;}else{if(!userVO.getPasswd().equals( portalUserVO.getPasswd())){errorMsg = "登录密码错误，请重新输入!";status = LOGIN_FAILED;}else{userService.updateUserLastLogin(portalUserVO);}}} catch (Exception e) {e.printStackTrace();}return status;}

jsp页面：

<s:form id="portalUserForm"  action="Login!login.action" onsubmit="return VerifyData(this)" theme="simple">                               <div class="email-div">                  <label for="remember"><strong class="email-label">帐号</strong></label>                  <input  type="text" spellcheck="false" name="portalUserVO.loginId" value="" id="loginId" >                </div>               <div class="passwd-div">                  <label for="Passwd"><strong class="passwd-label">密码</strong></label>                  <input  type="password" name="portalUserVO.passwd" value="" id="passwd">                </div>                <input name="signIn" type="submit" class="" id="signIn" value=""/>             </s:form>

情况一：报以下异常：

java.lang.NullPointerExceptionat com.hy.action.LoginAction.doLogin(LoginAction.java:21)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:404)at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:267)at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:229)at com.hy.action.AuthenticationInterceptor.intercept(AuthenticationInterceptor.java:20)

我检查了很久，后来通过debug才发觉action接收到页面的登录VO为null，发现是LoginAction没有portalUserVO的get/set方法，遂加上：

public PortalUserVO getPortalUserVO() {return portalUserVO;}public void setPortalUserVO(PortalUserVO portalUserVO) {this.portalUserVO = portalUserVO;}

错误解决。

情况二：页面的name属性name="portalUserVO.xxx"一定要与action中的PortalUserVO portalUserVO一致。

情况三：是否在alias.xml配置文件中为JSP页面的vo配置过，否则会无法识别：

<sqlMap namespace="alias"><typeAlias alias = "portalUserVO" type= "xx.entites.PortalUserVO" /></sqlMap>

同时，entites里同样得设置get/set方法（这好像是废话……）

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