Spring的驗證

Question

我想打春端驗證..春天驗證，但是當我試圖通過錯誤的形式，我得到的錯誤：

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'newProductType' available as request attribute 
    org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:141) 
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:178) 
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:198) 
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:164) 
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:151) 
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:142) 
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:126) 
    org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421) 
    org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142) 
    org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102) 
    org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79) 
    org.apache.jsp.jsp.admin_jsp._jspx_meth_form_005finput_005f0(admin_jsp.java:532) 
    org.apache.jsp.jsp.admin_jsp._jspService(admin_jsp.java:143) 
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393) 
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) 
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) 
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) 
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:710) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 

這裏我的代碼：

驗證： 公共類MetalTypeValidator實現了Validator {

@Override 
public boolean supports(Class<?> clazz) { 
    return MetalTypeEntity.class.isAssignableFrom(clazz); 
} 

@Override 
public void validate(Object target, Errors errors) { 
    ValidationUtils.rejectIfEmptyOrWhitespace(errors, "value", "value.required"); 
} 

}

聲明驗證在彈簧的XML：

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" /> 
<bean id="metalTypeValidator" class="com.javanix.xmetal.web.validator.MetalTypeValidator" /> 

控制器：

@Controller 
@RequestMapping("/admin") 
public class AdminController implements IConstants { 
    @Autowired 
    private MetalTypeValidator metalTypeValidator; 

    @Autowired 
    private MetalTypeServiceImpl metalTypeService; 

    @RequestMapping 
    public String getMainPageData(Map<String, Object> map) { 
     map.put("newProductType", new MetalTypeEntity()); 
     map.put("productTypeList", metalTypeService.getList()); 
     return "admin"; 
    } 

    @RequestMapping(value = "/add/product_type", method = RequestMethod.POST) 
    public String addProductType(
      @Valid @ModelAttribute("newType") MetalTypeEntity entity, 
      BindingResult result, SessionStatus status) { 

     metalTypeValidator.validate(entity, result); 
     if (result.hasErrors()) { 
      // result.getModel().put("newProductType", new MetalTypeEntity()); 
      return "/admin"; 
     } 
     metalTypeService.add(entity); 
     return "redirect:/admin"; 
    } 

} 

tiles.xml：

<definition name="admin" extends=".mainTemplate" > 
    <put-attribute name="title" value="Admin page" type="string" /> 
    <put-attribute name="content" value="/jsp/admin.jsp" /> 
    <!-- here some other stuff --> 
</definition> 

admin.jsp（用我的實體塊）：

<div id="MetalType"> 
    <table class="data"> 
     <tr> 
      <th><spring:message code="label.header.metal.name"/> **</th> 
      <th>&nbsp;</th> 
     </tr> 
     <c:forEach items="${productTypeList}" var="productType"> 
      <tr> 
       <td>${productType.value}</td> 
       <td><a href = "<c:url value="admin/delete/product_type/${productType.id}" />" > <spring:message code="label.button.delete"/> </a> </td> 
      </tr> 
     </c:forEach> 

     <form:form method="post" action="admin/add/product_type" commandName="newProductType"> 
      <tr> 
       <td><form:input path="value"/></td> 
       <td><input type="submit" value="<spring:message code="label.type.add"/>"/></td> 
      </tr> 
      <tr> 
       <td><form:errors path="value" cssClass="errors"/></td> 
       <td>&nbsp;</td> 
      </tr> 
     </form:form> 

    </table> 
</div> 

Answer 1

添加這樣的事情你Controller類：

@ModelAttribute("newProductType") 
public MetalTypeEntity createMetalTypeEntity() { 
    return new MetalTypeEntity(); 
} 

Answer 2

這是一個很好的例子對於春季CRUD應用程序：

http://www.javacodegeeks.com/2011/04/spring-mvc3-hibernate-crud-sample.html?m=1

看一看

@RequestMapping(value="/updateContact", method=RequestMethod.POST) 
public String update(@ModelAttribute("editContact") Contact contact, BindingResult result, SessionStatus status) 
{ 
    validator.validate(contact, result); 
    if (result.hasErrors()) { 
    return "editContact"; 
    } 
    contactsDAO.update(contact); 
    status.setComplete(); 
    return "redirect:viewAllContacts.do"; 
}