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完全初学者到spring mvc。我需要在 springmvc 框架中预填充编辑表单。

contact_edit.jsp

<form:form method="post" action="edit/1" commandName="contact">
<% Contact contact = (Contact)request.getAttribute("contact");  %>
    <table>

        <tr>
            <td><form:label path="firstname">
                    <spring:message code="label.firstname" />
                </form:label></td>
            <td><form:input path="firstname" value="<%=contact.getFirstname() %>"/></td>
        </tr>
        <tr>
            <td><form:label path="lastname">
                    <spring:message code="label.lastname" />
                </form:label></td>
            <td><form:input path="lastname" value="<%=contact.getLastname() %>"/></td>
        </tr>
        <tr>
            <td><form:label path="email">
                    <spring:message code="label.email" />
                </form:label></td>
            <td><form:input path="email" value="<%=contact.getEmail()%>" /></td>
        </tr>
        <tr>
            <td><form:label path="telephone">
                    <spring:message code="label.telephone" />
                </form:label></td>
            <td><form:input path="telephone" value="<%=contact.getTelephone()%>"/></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit"
                value="<spring:message code="label.addcontact"/>" /></td>
        </tr>
    </table>
</form:form>

获取此页面的控制器代码：

@RequestMapping(value = "/edit/{contactId}", method = RequestMethod.GET)
public ModelAndView edit(@PathVariable("contactId") Integer contactId,
        HttpServletRequest request) {
    System.out.println("I was here");
    Contact contact = contactService.getContact(contactId);
    request.setAttribute("contact", contact);
    Map<String, Object> model = new HashedMap();
    model.put("contact", contact);

    return new ModelAndView("contact_edit", model);
}

我的例外：

org.springframework.beans.InvalidPropertyException: Invalid property 'firstname' of bean class [net.viralpatel.contact.form.Contact_$$_javassist_0]: Getter for property 'firstname' threw exception; nested exception is java.lang.reflect.InvocationTargetException
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:845)
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:721)
org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:99)
org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:219)
org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:120)
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.LabelTag.autogenerateFor(LabelTag.java:129)
org.springframework.web.servlet.tags.form.LabelTag.resolveFor(LabelTag.java:119)
org.springframework.web.servlet.tags.form.LabelTag.writeTagContent(LabelTag.java:89)
org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102)
org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79)
org.apache.jsp.WEB_002dINF.jsp.contact_005fedit_jsp._jspx_meth_form_005flabel_005f0(contact_005fedit_jsp.java:320)
org.apache.jsp.WEB_002dINF.jsp.contact_005fedit_jsp._jspService(contact_005fedit_jsp.java:147)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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:1180)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

root cause

  java.lang.reflect.InvocationTargetException
  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:761)
org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:721)
org.springframework.validation.AbstractPropertyBindingResult.getActualFieldValue(AbstractPropertyBindingResult.java:99)
org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:219)
org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:120)
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.LabelTag.autogenerateFor(LabelTag.java:129)
org.springframework.web.servlet.tags.form.LabelTag.resolveFor(LabelTag.java:119)
org.springframework.web.servlet.tags.form.LabelTag.writeTagContent(LabelTag.java:89)
org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102)
org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79)
org.apache.jsp.WEB_002dINF.jsp.contact_005fedit_jsp._jspx_meth_form_005flabel_005f0(contact_005fedit_jsp.java:320)
org.apache.jsp.WEB_002dINF.jsp.contact_005fedit_jsp._jspService(contact_005fedit_jsp.java:147)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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:1180)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

我的联系方式：

@Entity
@Table(name="CONTACTS")
public class Contact {

@Id
@Column(name="ID")
@GeneratedValue
private Integer id;

@Column(name="FIRSTNAME")
private String firstname;

@Column(name="LASTNAME")
private String lastname;

@Column(name="EMAIL")
private String email;

@Column(name="TELEPHONE")
private String telephone;


public String getEmail() {
    return email;
}
public String getTelephone() {
    return telephone;
}
public void setEmail(String email) {
    this.email = email;
}
public void setTelephone(String telephone) {
    this.telephone = telephone;
}
public String getFirstname() {
    return firstname;
}
public String getLastname() {
    return lastname;
}
public void setFirstname(String firstname) {
    this.firstname = firstname;
}
public void setLastname(String lastname) {
    this.lastname = lastname;
}
public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}

}

我的 Contact 类包含所有 getter 和 setter 方法，甚至我的创建表单也可以正常工作。无法弄清楚是什么在哪里造成了问题。我已经在请求以及 ModelAndView 类中插入了联系人对象。！！！？？！！

4

4 回答 4

1

我通过在 applicationContext.xml 而不是 spring-servlet.xml 中初始化 sessionFactory 来解决它。并确保将其从 spring-servlet.xml 中删除。

于 2012-09-23T14:54:15.360 回答
0

您不需要显式调用 getter。由于您使用的是 spring 表单标签，因此 spring 将自动填充您的表单。

编辑：

@RequestMapping(value = "/edit/{contactId}", method = RequestMethod.GET)
public ModelAndView edit(@PathVariable("contactId") Integer contactId) {
    System.out.println("I was here");
    Contact contact = contactService.getContact(contactId);
    return new ModelAndView("contact_edit","contact", contact);
}

请尝试替换此行

Contact contact = contactService.getContact(contactId);

和

Contact contact = new Contact();

只是为了找出问题的根源

于 2012-09-12T04:21:47.427 回答
0

我认为问题出在您的模型类上。您的模型中有 getter/setter 方法firstname吗？如果是，请添加代码以便我们进一步调查

于 2012-09-12T03:59:28.843 回答
0

您的代码中要纠正的几件事：

1）当您将域对象添加到模型时，spring mvc 使它们可用于您的 JSP。您无需在请求中再次设置域对象。因此，请从您的控制器中删除以下内容。

request.setAttribute("contact", contact);

同样不需要在你的jsp中引用请求对象。所以删除

Contact contact = (Contact)request.getAttribute("contact");

2) 当您使用 spring 表单标签的 'commandName' 属性设置表单支持域对象时，spring 使用域对象的属性来设置/获取表单元素的值。

例如，在以下代码中，spring 将在填充/提交表单时使用 getter/setter 作为联系人的名字属性。

<form:form method="post" action="edit/1" commandName="contact">
    <form:input path="firstname"/>
</form>

只需确保为您需要从域/表单烘焙对象中使用的所有属性实现 getter/setter。

于 2012-09-12T04:34:54.967 回答