Question

我正在按照http://docs.spring.io/docs/Spring-MVC-step-by-step/所述的春季逐步完成网页应用。

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

       <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
         <property name="basename" value="messages"/>
       </bean>

       <!-- Scans the classpath of this application for @Components to deploy as beans -->
       <context:component-scan base-package="com.companyname.springapp.web" />

       <!-- Configures the @Controller programming model -->
       <mvc:annotation-driven/>

       <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
         <property name="prefix" value="/WEB-INF/views/"></property>
         <property name="suffix" value=".jsp"></property>        
       </bean>
</beans>

<%@ include file="/WEB-INF/views/include.jsp" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

<html>
<head>
  <title><fmt:message key="title"/></title>
  <style>
    .error { color: red; }
  </style>  
</head>
<body>
<h1><fmt:message key="priceincrease.heading"/></h1>
<form:form method="post" commandName="priceIncrease">
  <table width="95%" bgcolor="f8f8ff" border="0" cellspacing="0" cellpadding="5">
    <tr>
      <td align="right" width="20%">Increase (%):</td>
        <td width="20%">
          <form:input path="percentage"/>
        </td>
        <td width="60%">
          <form:errors path="percentage" cssClass="error"/>
        </td>
    </tr>
  </table>
  <br>
  <input type="submit" value="Execute">
</form:form>
<a href="<c:url value="hello.htm"/>">Home</a>
</body>
</html>

package com.companyname.springapp.service;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;

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

public class PriceIncrease {

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

    @Min(0)
    @Max(50)
    private int percentage;

    public void setPercentage(int i) {
        percentage = i;
        logger.info("Percentage set to " + i);
    }

    public int getPercentage() {
        return percentage;
    }
}

package com.companyname.springapp.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.validation.Valid;

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

import com.companyname.springapp.service.PriceIncrease;
import com.companyname.springapp.service.ProductManager;

@Controller
@RequestMapping(value="/priceincrease.htm")
public class PriceIncreaseFormController {

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

    @Autowired
    private ProductManager productManager;

    @RequestMapping(method = RequestMethod.POST)
    public String onSubmit(@Valid PriceIncrease priceIncrease, BindingResult result)
    {
        if (result.hasErrors()) {
            return "priceincrease";
        }

        int increase = priceIncrease.getPercentage();
        logger.info("Increasing prices by " + increase + "%.");

        productManager.increasePrice(increase);

        return "redirect:/hello.htm";
    }

    @RequestMapping(method = RequestMethod.GET)
    protected PriceIncrease formBackingObject(HttpServletRequest request) throws ServletException {
        PriceIncrease priceIncrease = new PriceIncrease();
        priceIncrease.setPercentage(15);
        return priceIncrease;
    }

    public void setProductManager(ProductManager productManager) {
        this.productManager = productManager;
    }

    public ProductManager getProductManager() {
        return productManager;
    }
}

title=SpringApp
heading=Hello :: SpringApp
greeting=Greetings, it is now
priceincrease.heading=Price Increase :: SpringApp
error.not-specified=Percentage not specified!!!
error.too-low=You have to specify a percentage higher than {0}!
error.too-high=Don''t be greedy - you can''t raise prices by more than {0}%!
required=Entry required.
typeMismatch=Invalid data.
typeMismatch.percentage=That is not a number!!!

问题是我没有得到我定义的消息，例如当我在百分比字段中插入65时，我没有得到以下消息：不要贪婪 - 你不能提高价格超过{0}％！而不是这个我得到默认消息。我删除了与自动连接注释相关的代码，只是为了缩短帖子。您必须知道应用程序正常工作，问题出在返回的消息中。

如何显示我想要的消息？

Answer 1

这篇文章详细解释了如何在spring mvc中进行验证。 Click Here

Answer 2

你只需要实现Validator这里有一个简单的例子......

public class PriceIncreaseValidator implements Validator {

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

    @Override
    public void validate( Object o, Errors e ) {            
        PriceIncrease priceIncrease = (PriceIncrease) o;
       if( priceIncrease.getPercentage() == 0 ) {
           e.rejectValue( "priceIncrease", "error.too-low");
       } else if( priceIncrease.getPercentage() >= 50 ) {
           e.rejectValue( "priceIncrease", "error.too-high");
       }

    }
}

如何在春天更改错误消息？

2 个答案: