Question

我正在掏出我留下的这个简单问题的小头发：我已经构建了一个编译和部署的Maven / Java7 / Spring3 / MySQL / Tomcat webapp。我的信用卡品牌和信用卡表格/验证员/控制器完美无瑕地工作用于将行插入各自的表中。但我的联系表格会显示出来但bodyOfEmail返回的值始终为null。它必须是一些恶魔微妙的拼写错误或配置错误，但我无法发现它 - 任何人都可以对此有所了解？

ContactForm.java

public class ContactForm {

    private String bodyOfEmail;

    // accessors

}

ContactValidator.java

public class ContactValidator implements Validator
{
    private static final Logger logger = Logger.getLogger( ContactValidator.class);

    //constructors
    public ContactValidator() {}

    //stuff
    public boolean supports(Class candidate)
    {
        return ContactForm.class.isAssignableFrom(candidate);
    }

    public void validate(Object obj, Errors errors)
    {
        logger.debug("entering");

        ContactForm form = (ContactForm) obj;

        if( errors.hasErrors() ) { // could be a data binding error, could be all sorts of things
            logger.debug( "number of errors found:" + errors.getErrorCount());
            if( errors.hasGlobalErrors()) {
                logger.debug( "    number of global errors found:" + errors.getGlobalErrorCount());
                java.util.List<ObjectError> globalErrorList = errors.getGlobalErrors();
                ListIterator gelIter = globalErrorList.listIterator();
                while( gelIter.hasNext()) {
                    logger.debug( "        gel:" + gelIter.next().toString());
                }
            }
            if( errors.hasFieldErrors()) {
                logger.debug( "    number of field  errors found:" + errors.getFieldErrorCount());
                java.util.List<FieldError>  fieldErrorList  = errors.getFieldErrors();
                ListIterator felIter = fieldErrorList.listIterator();
                while( felIter.hasNext()) {
                    logger.debug( "        fel:" + felIter.next().toString());
                }
            }
        } else { //no basic field errors detected, now apply business logic validation
            // validate textarea field
            String naughtyChars = "xxxx";
            if( form.getBodyOfEmail().matches(naughtyChars)) {
                errors.rejectValue("bodyOfEmail", "validation.negative", "bodyOfEmail contains naughty characters");    
            }
        }

        logger.debug("exiting normally");
    }

}

ContactController.java

@RequestMapping(value="/contact")
@Controller
public class ContactController
{
    private static final Logger logger = Logger.getLogger(ContactController.class);

    ContactValidator contactValidator;   // comes in from bean

    private String fromAddr;   // these all come in from bean
    private String toAddr;
    private String subjectOfEmail;

    JavaMailSender mailSender;

    //getters and setters
    public ContactValidator getContactValidator() {
        return contactValidator;
    }
    public void setContactValidator(ContactValidator contactValidator) {
        this.contactValidator = contactValidator;
    }
    public String getFromAddr() {
        return fromAddr;
    }
    public void setFromAddr(String fromAddr) {
        this.fromAddr = fromAddr;
    }
    public String getToAddr() {
        return toAddr;
    }
    public void setToAddr(String toAddr) {
        this.toAddr = toAddr;
    }
    public String getSubjectOfEmail() {
        return subjectOfEmail;
    }
    public void setSubjectOfEmail(String subjectOfEmail) {
        this.subjectOfEmail = subjectOfEmail;
    }
    public JavaMailSender getMailSender() {
        return mailSender;
    }
    public void setMailSender(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }

    //stuff
    @RequestMapping( method=RequestMethod.GET)   // home path
    public String displayContactForm(
        ModelMap model)
    {
        logger.debug("entering");

        model.addAttribute( "contactForm", new ContactForm());

        logger.debug("exiting normally");
        return "contact";  // maps to /WEB-INF/views/index
    }

    @RequestMapping( method=RequestMethod.POST)   // home path
    public String processContactForm(
        @ModelAttribute("contactForm") @Valid ContactForm contactForm, BindingResult result)
    {
        logger.debug("entering");

        String boody = contactForm.getBodyOfEmail();
        if( boody == null) {
            logger.debug("body of email is null, bad!");    // <-- this is the problem
            System.out.println("body of email is null, bad!");
        }

        contactValidator.validate( contactForm, result);
        if( result.hasErrors()) {     //binding and/or validation failed on one or more fields, re-display form with errmsgs showing
          logger.debug( "VALIDATE FOUND ERRORS");
          logger.debug( result.toString());
          return "contactFailed";
        }  

        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(    this.getFromAddr());
        message.setTo(      this.getToAddr());
        message.setSubject( this.getSubjectOfEmail());
        message.setText( contactForm.getBodyOfEmail());
//        message.setText( "forced in");
        try{
            this.mailSender.send(message);
        } catch( MailException ex) {
            //log it and go on
            logger.debug( "MAIL BROKEN");
            logger.debug( ex.getMessage());  
            return "contactFailed";
        }

        logger.debug("exiting normally");
        return "contactSent";  // maps to /WEB-INF/views/index
    }
}

servlet的context.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans ...>

  <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

  <!-- Scans within the base package of the application for @Components to configure as beans -->
  <!-- @Controller, @Service, @Configuration, etc. -->
  <context:component-scan base-package="skincare.web"/>

  <!--Enables many annotations and searches for @Controller annotated methods etc.. -->
  <context:annotation-config />

  <!--JSR-303 (Bean validation) support will be detected on classpath and enabled automatically-->
  <mvc:annotation-driven />

  <bean id="mailSender"                       class="org.springframework.mail.javamail.JavaMailSenderImpl">
    <property name="host"                     value="localhost" />
    <property name="port"                     value="25" />
  </bean>

  <!-- forms -->
  <bean name="creditCardBrandForm"            class="skincare.web.model.CreditCardBrandForm" />
  <bean name="creditCardForm"                 class="skincare.web.model.CreditCardForm" />
  <bean name="contactForm"                    class="skincare.web.model.ContactForm" />

  <!-- validators -->   
  <bean name="creditCardBrandValidator"       class="skincare.web.validator.CreditCardBrandValidator" />

  <bean name="creditCardValidator"            class="skincare.web.validator.CreditCardValidator" >
    <property name="creditCardBrandService"   ref="creditCardBrandService" />
  </bean>

  <bean name="contactValidator"               class="skincare.web.validator.ContactValidator" />

  <!-- controllers -->      
  <bean id="homeController"                   class="skincare.web.controller.HomeController" />

  <bean id="creditCardBrandController"        class="skincare.web.controller.CreditCardBrandController">
    <property name="creditCardBrandService"   ref="creditCardBrandService" />
    <property name="creditCardBrandValidator" ref="creditCardBrandValidator" />
  </bean>

  <bean id="creditCardController"             class="skincare.web.controller.CreditCardController">
    <property name="creditCardBrandService"   ref="creditCardBrandService" />
    <property name="creditCardService"        ref="creditCardService" />
    <property name="creditCardValidator"      ref="creditCardValidator" />
  </bean>

  <bean id="contactController"                class="skincare.web.controller.ContactController">
    <property name="contactValidator"         ref="contactValidator" />
    <property name="fromAddr"                 value="nobody@reply.org" />
    <property name="toAddr"                   value="prez@whitehouse.gov" />
    <property name="subjectOfEmail"           value="a msg from a concerned citizen" />
    <property name="mailSender"               ref="mailSender" />
  </bean>

  <!-- resolvers -->  
  <bean id="jspViewResolver"   class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
  </bean>

  <bean id="messageSource"     class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="customMessages"/>  <!-- in src/main/resources -->
  </bean>

</beans>

contact.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c"      uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt"    uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%@ taglib prefix="form"   uri="http://www.springframework.org/tags/form" %>
<html>
<style>
.error {
    color: #ff0000;
}
</style>
<head>
  <title>Contact</title>
</head>
<body>
  <h1>What is your concern?</h1>
  <form:form modelAttribute="contactForm" method="post">
 <!--   <form:errors path="*" cssClass="errorblock" element="div" />  -->
    <table>
      <tr>
        <td><form:label  path="bodyOfEmail"> bodyOfEmail: </form:label></td>
        <td><form:input  path="bodyOfEmail" /></td>
        <td><form:errors path="bodyOfEmail" cssClass="error" /></td>
      </tr>
      <tr>
        <td><input type="submit" value="Send" /></td>
      </tr>
    </table>
  </form:form>
  <br>
</body>
</html>

那么有人能找到我出错的地方吗？

TIA，

仍在学习史蒂夫

Answer 1

一旦遇到问题，我发现在我的表单标签中定义的编码会产生问题。我删除了它，现在我能够从控制器

中的JSP中的输入元素中检索值

是：

<form:form  name="searchForm" modelAttribute="newRequest" class="form-horizontal" method="post" enctype="multipart/form-data">

我改为下面，我可以检索值..

 <form:form  name="searchForm" modelAttribute="newRequest" class="form-horizontal" method="post" >

Spring webapp表单字段值始终返回null

1 个答案: