小编典典

Spring MVC:如何重定向到有错误的页面?

spring-mvc

我试图使我的控制器重定向到带有自定义错误消息的页面:

    @RequestMapping(method=RequestMethod.POST)
    public String processSubmit(@Valid Voter voter, BindingResult result, HttpServletRequest request) {
        if (result.hasErrors()) {
            logger.info("RegisterController encountered form errors ");
            return "registerPage";
        }
        if (service.isVoterRegistered(voter.getVoterID())) {
          logger.info("VoterID exists");

          request.setAttribute("firstName", voter.getFirstName());
          request.setAttribute("lastName", voter.getLastName());
          request.setAttribute("ssn", voter.getSsn());
          return "forward:/question";

        }else {
          logger.info("RegisterController is redirecting because it voter info failed to authenticate");
          //TODO: should re-direct to register page with error

          return "redirect:registerPage";
        }
       }
}






  <!-- registerPage.jsp -->
    <div class="container">
        <h1>
            Voter Registration
        </h1>
        <div class="span-12 last">  
            <form:form modelAttribute="voter" method="post">
                <fieldset>      
                    <legend>Voter Fields</legend>
                    <p>
                        <form:label for="firstName" path="firstName" cssErrorClass="error">First Name : </form:label></br>
                        <form:input path="firstName" /><form:errors path="firstName"/>
                    </p>
                    <p> 
                        <form:label for="lastName" path="lastName" cssErrorClass="error">Last Name : </form:label> </br>
                        <form:input path="lastName" /> <form:errors path="lastName" />
                    </p>
                    <p> 
                        <form:label for="ssn" path="ssn" cssErrorClass="error">Social Security Number : </form:label> </br>
                        <form:input path="ssn" /> <form:errors path="ssn" />
                    </p>
                    <p> 
                        <input type="submit"/>
                    </p>
                </fieldset>
            </form:form>
        </div>
        <hr>    
    </div>

在重定向到register.jsp页面时,我希望该页面显示一条错误消息,指出未注册选民。我的问题是如何让Controller返回页面,就像表单有验证错误一样(即result.hasErrors()==
true)。

提前致谢


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2020-06-01

共1个答案

小编典典

您可以在jsp中添加以下部分-

<c:choose>
<c:when test="${not empty  errors}">
    <div class="error">
    <c:forEach items="${errors}" var="err">
        ${err.defaultMessage}
        <br/>
    </c:forEach>
    </div>
</c:when>
</c:choose>

c不过是this–

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

另外,您还需要将错误传递到模型中,并在控制器方法的if块中进行如下查看:

model.addAttribute("errors",result.getFieldErrors());

error DIV中的 class 只是我的自定义CSS,显示为红色块-

.error{
    color: red;
    border:2px solid red;
    padding:10px;

}

您也可以看看这个
希望我的回答对您有所帮助。

2020-06-01