The error messages not show and input empty xml, version, forward, problem, process

amy

I got a problem with Spring3MVC.

1. /loginInput  initalize form data and forward to /loginInput.jsp
2. the jsp has form ,the form's action isquot;/Loginquot;
3. /login process the form  a. validate the input ,if has error forward to /loginInput(inital form datas,then forward to /loginInput.jsp page,show the input data and error messages)  b. no errors, load user imformations

some one can help me?

here i show the code:

web.xml
lt;?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?gt;
lt;web-app version=quot;2.4quot; xmlns=quot;xml/ns/j2eequot;
xmlns:xsi=quot;2001/XMLSchema-instancequot;
xsi:schemaLocation=quot;xml/ns/j2ee
xml/ns/j2ee/web-app_2_4.xsdquot;gt;

lt;context-paramgt;
lt;param-namegt;contextConfigLocationlt;/param-namegt;
lt;param-valuegt;/WEB-INF/classes/spring/spring-mvc.xmllt;/param-valuegt;
lt;/context-paramgt;

lt;listenergt;
lt;listener-classgt;org..web.context.ContextLoade  rListenerlt;/listener-classgt;
lt;/listenergt;lt;!-- Spring #21047;#26032;Introspector#38450;#27490;#20839;#23384;#27945;#38706;--gt;
lt;listenergt;   lt;listener-classgt;org..web.util.IntrospectorCle  anupListenerlt;/listener-classgt;
lt;/listenergt;

lt;!-- Spring Serlvet --gt;
lt;servletgt;
lt;servlet-namegt;dispatcherServletlt;/servlet-namegt;
lt;servlet-classgt;org..web.servlet.DispatcherSe  rvletlt;/servlet-classgt;
lt;init-paramgt;
lt;param-namegt;contextConfigLocationlt;/param-namegt;
lt;param-valuegt;/WEB-INF/classes/spring/spring-mvc.xmllt;/param-valuegt;
lt;/init-paramgt;
lt;load-on-startupgt;1lt;/load-on-startupgt;
lt;/servletgt;
lt;servlet-mappinggt;
lt;servlet-namegt;dispatcherServletlt;/servlet-namegt;
lt;ucl-patterngt;/lt;/ucl-patterngt;
lt;/servlet-mappinggt;

lt;welcome-file-listgt;
lt;welcome-filegt;index.jsplt;/welcome-filegt;
lt;/welcome-file-listgt;
lt;/web-appgt;

spring-mvc.xml
lt;?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?gt;
lt;beans xmlns=quot;schema/beansquot;
xmlns:xsi=quot;2001/XMLSchema-instancequot;
xmlns:mvc=quot;schema/mvcquot;
xmlns=quot;schema/pquot;
xmlns:context=quot;schema/contextquot;
xsi:schemaLocation=quot;       schema/beans        schem...-beans-3.0.xsd              schema/context        schem...ontext-3.0.xsd              schema/mvc       schema/mvc/spring-mvc-3.0.xsdquot;gt;
lt;context:component-scan base-package=quot;cn.testquot;/gt;
lt;!-- ControllerClassNameHandlerMapping#29992;#20110;#21305;#37197;#25105;#20204;#30340;Controller --gt;      lt;bean class=quot;org..web.servlet.mvc.support  .ControllerClassNameHandlerMappingquot; p:basePackage=quot;cn.test.webquot;/gt;      lt;!-- #20351;#29992;annocation#21019;#24314;Controller#30340;bean --gt;   lt;bean class=quot;org..web.servlet.mvc.annotat  ion.AnnotationMethodHandlerAdapterquot;/gt;   
lt;bean class=quot;org..web.servlet.view.Intern  alResourceViewResolverquot; prefix=quot;/quot; p:suffix=quot;.jspquot; /gt;
lt;bean id=quot;messageSourcequot; class=quot;org..context.support.Resourc  eBundleMessageSourcequot; p:basename=quot;messagesquot;/gt;
lt;mvc:annotation-driven/gt;
lt;/beansgt;

index.jsp

HTML Code:
lt;%@ page language=quot;javaquot; import=quot;java.util.*quot; pageEncoding=quot;UTF-8quot;%gt;
lt;!DOCTYPE HTML PUBLIC quot;-//W3C//DTD HTML 4.01 Transitional//ENquot;gt;
lt;htmlgt; lt;headgt;       lt;titlegt;Testlt;/titlegt; lt;/headgt;  lt;bodygt;  lt;h1gt;#36827;#20837;LoginInput --gt; lt;a hrcf=quot;/loginInputquot;gt;LoinInputlt;/agt;lt;/h1gt; lt;/bodygt;
lt;/htmlgt;
LoginInput.jsp

HTML Code:
lt;%@ page language=quot;javaquot; import=quot;java.util.*quot; pageEncoding=quot;UTF-8quot;%gt;
lt;%@ taglib uri=quot;tagsquot; prefix=quot;springquot; %gt;
lt;%@ taglib uri=quot;tags/formquot; prefix=quot;springFormquot; %gt;
lt;!DOCTYPE HTML PUBLIC quot;-//W3C//DTD HTML 4.01 Transitional//ENquot;gt;
lt;htmlgt; lt;headgt;      lt;titlegt;LoginInputlt;/titlegt; lt;/headgt;   lt;bodygt;     lt;springForm:form action=quot;/loginquot; commandName=quot;loginCommandquot;gt;   lt;springForm:input path=quot;user.usernamequot; size=quot;10quot;/gt; lt;springForm:errors path=quot;user.usernamequot;/gt;lt;br/gt;   lt;input type=quot;submitquot;/gt;   lt;/springForm:formgt;    lt;/bodygt;
lt;/htmlgt;I got the answer:

public String updateInput(....){  //database query   //other operations    return quot;/user/article/updateInput.jspquot;
}

public String update(....BindingResult result){     if(result.hasErrors()){    return updateInput(....);  }  //operations .....
}