我无法在JSP page.Actually到了错误信息,我想检查用户名和密码是正确的或者不database.Iam在控制器检查抛出dataexception DAO和捕捉显示在jsp中的错误下面的代码如何使用Spring MVC的
SimpleFormController
public ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response,Object command,BindException errors) throws Exception {
log.info("onSubmit handleRequest method"+request.getParameter("username"));
boolean isError=false;
String username="",password="",errMessage="";
username=request.getParameter("username");
password=request.getParameter("password");
UserBean ubean=null;
try{
ubean=userservice.chkUsername(username,password);
}catch(DataException ex){
errMessage=ex.getMessage();
isError=true;
//throw ex;
}
if(isError==true){
System.out.println("errMessage handleRequest method"+errMessage);
errors.reject(errMessage);
return showForm(request, response, errors);
}
log.info("After shownform method called");
HttpSession session=request.getSession(true);
session.setAttribute("User",ubean);
return new ModelAndView("UserPage");
}
public ModelAndView showForm(HttpServletRequest request, HttpServletResponse response,BindException errors) throws Exception {
//Displaying Count size
log.info("Show form Error Count"+errors.getErrorCount()+getFormView());
return new ModelAndView(getFormView());
}
荫试图在jsp页面即两种方式,
JSP页面来显示: -
1)
<spring:hasBindErrors name="UserBean">
<h3>You have errors in your input!</h3>
<font color="red">
<c:forEach items="${errors.allErrors}" var="error">
<spring:message code="${error.code}" text="${error.defaultMessage}"/>
</c:forEach>
</font>
</spring:hasBindErrors>
2) <form:form action="userpage.htm" method="post" onsubmit="javascript:fun()">
<tr>
<form:errors path="*"/>
--------
--------
</form:form>
我试图在上面jsp.But两种方式最后我没跟任何上述问题有任何thing.is有code.plz帮我
Iam使用数据库表检查数据然后我抛出异常i..e invalida username/apssword.But如果iam使用验证程序,它在表单提交和数据库命中object.is之间工作是正确的? – user1357722
在我看来,你应该注入你的DAO到您的验证和实现自定义验证里面所有的逻辑。引用来自[链接](http://stackoverflow.com/questions/1045895/should-validators-in-spring-access-the-database):“那么你的验证器只是春豆,是的,所以他们可以注入与处理数据访问的服务对象相关联,您可以让验证器从数据库中获取数据,而不会影响设计。“ – MrKiller21