Question

我在Spring Application.i使用Spring MVC 3和Apache Tiles时显示错误消息有问题。当我在表单中有错误时，它将不会显示错误消息。请帮我听一下这段代码。

Web.xml中

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>SpringExample</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>
                /WEB-INF/spring/dispatcher-servlet.xml
            </param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>  

</web-app>

调度-servlet.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="com.examples.spring" />


    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass">
            <value>
                org.springframework.web.servlet.view.tiles2.TilesView
            </value>
        </property>
    </bean>

    <bean id="tilesConfigurer"
        class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
        <property name="definitions">
            <list>
                <value>/WEB-INF/tiles.xml</value>
            </list>
        </property>
    </bean>


</beans>

tiles.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">
<tiles-definitions>


    <definition name="create_account_success" template="/WEB-INF/jsp/account/SuccessJSP.jsp">
    </definition>

    <definition name="account_create" template="/WEB-INF/jsp/account/testForm.jsp">

    </definition>


</tiles-definitions>

testForm.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    <form:form id="form" modelAttribute="formCreate" method="post">
    <table>
        <tr>
            <td>Name :</td>
            <td><form:input path="name"/>
                <form:errors path="name"/>
            </td>
        </tr>
        <tr>
            <td>Password :</td>
            <td><form:input path="password"/>
                <form:errors path="password"/>
            </td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" /></td>
        </tr>
    </table>
    </form:form>
</body>
</html>

AccountRegistrationController.java

package com.examples.spring.controller;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.examples.spring.dto.AccountDTO;
import com.examples.spring.validator.AccountValidator;

@Controller
public class AccountRegistrationController {


    public static final String BASE_URL = "/account";

    @RequestMapping(value = BASE_URL + "/create" ,method = RequestMethod.GET)
    public ModelAndView accountCreate(){
        ModelAndView view = new ModelAndView();
        view.addObject("formCreate", new AccountDTO());
        view.setViewName("account_create");
        return view;
    }

    @RequestMapping(value = BASE_URL + "/create" ,method = RequestMethod.POST)
    public ModelAndView accountRegistration(@ModelAttribute AccountDTO accountDTO,BindingResult result ){

        ModelAndView view = new ModelAndView();

        AccountValidator validator = new AccountValidator();
        validator.validate(accountDTO, result);
        if (result.hasErrors()) {
            view.setViewName("account_create");
            view.addObject("formCreate", accountDTO);
            return view;
        }
        view.setViewName("create_account_success");
        return view;
    }

    @RequestMapping(value = BASE_URL + "/login" ,method = RequestMethod.GET)
    public ModelAndView accountLogin(){
        ModelAndView view = new ModelAndView();
        view.setViewName("account_login");
        return view;
    }
}

AccountValidator.java

package com.examples.spring.validator;

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

import com.examples.spring.dto.AccountDTO;

public class AccountValidator implements Validator {

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

    @Override
    public void validate(Object result, Errors error) {
        AccountDTO accountDTO = (AccountDTO) result;

        ValidationUtils.rejectIfEmpty(error, "name", "require.name", "Name Requires.");
        ValidationUtils.rejectIfEmpty(error, "password", "require.password", "Password Requires.");
    }

}

AccountDTO.java

package com.examples.spring.dto;

public class AccountDTO {


    private String name;
    private String password;

    public AccountDTO() {
        // TODO Auto-generated constructor stub
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

}

我的代码运行良好，但它不会在<form:errors />中显示错误消息。

请帮帮我。

Answer 1

ValidationUtils.rejectIfEmpty的第三个参数是错误代码。它应该是资源包中实际消息的关键。如果它找不到值，我不知道它是如何表现的。您应该将其更改为使用密钥，并可选择设置默认消息。请参阅api。

Answer 2

您需要将验证器注册到要使用它的控制器。请参阅：http://static.springsource.org/spring/docs/3.0.0.RC3/reference/html/ch05s07.html#validation.mvc

Spring MVC 3 Validator不显示错误消息

2 个答案: