jsp - Spring Forms-如何检查特定路径上的错误

Question

我正在使用Spring Form库来处理应用程序中的搜索页面。这是我的DD中的片段，显示了bean的配置:

<bean name="/search.html" class="myapp.web.AccountSearchController">
        <property name="sessionForm" value="true"/>
        <property name="commandName" value="searchAccounts"/>
        <property name="commandClass" value="myapp.service.AccountSearch"/>
        <property name="validator">
            <bean class="myapp.service.AccountSearchValidator"/>
        </property>
        <property name="formView" value="accountSearch"/>
        <property name="successView" value="accountSearch"/>
    </bean>

验证器类非常简单:

package myapp.service;

import org.springframework.validation.Validator;
import org.springframework.validation.Errors;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class AccountSearchValidator implements Validator {

    /** Logger for this class and subclasses */
    protected final Log logger = LogFactory.getLog(getClass());

    public boolean supports(Class clazz) {
        return AccountSearch.class.equals(clazz);
    }

    public void validate(Object obj, Errors errors) {
        AccountSearch accountSearch = (AccountSearch) obj;
        if (accountSearch == null) {
            errors.rejectValue("domainName", "error.accountSearch.neither-specified", null, "Value required.");
        } else if (accountSearch.getAccountId().isEmpty() && 
                   accountSearch.getDomainName().isEmpty() ) {
            errors.rejectValue("domainName", "error.accountSearch.neither-specified", null, "Value required.");
        }
    }
}

在我的JSP中，我的表单显示在HTML表中。我希望将特定于字段的错误显示在相应字段下作为单独的表格行。这是一个片段:

            <tr>
                <td align="right" valign="top"><form:label path="domainName">Domain Name</form:label>:</td>
                <td><form:input path="domainName" size="30"/></td>
            </tr>
            <tr>
                 <td>&nbsp;</td>
                 <td><form:errors path="domainName" cssClass="error"/></td>
            </tr>

我的问题是-如何使错误行的输出以存在错误为条件？是否可以从我的JSP访问Validator实例？ c:if标签的测试内容是什么？

谢谢，

-aj

Answer 1

好的，我花了几天时间，但我发现了:

    <c:set var="domainNameErrors"><form:errors path="domainName"/></c:set>
    <c:if test="${not empty domainNameErrors}">
        <tr>
             <td>&nbsp;</td>
             <td>${domainNameErrors}</td>
        </tr>
    </c:if>

这篇文章非常有帮助:
http://forum.springsource.org/archive/index.php/t-51044.html