spring-mvc @Size注解没有正确解析错误信息

Question

我正在尝试使用 Spring 中的验证器和 ValidationMessages.properties 来定义在 javax 注释（@NotNull、@Size 等）中定义的错误消息。但是，打印原始字符串（如 "Size.firstName.length"）而不是已解析的消息。此外，tomcat 显示一条警告，上面写着

WARNING: ResourceBundle [/WEB-INF/messages/] not found for MessageSource: Can't find bundle for base name /WEB-INF/messages/, locale en_US

此外，我在这里也检查了类似的问题，但没有任何效果。假设这是一个简单的 Person POJO。

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class User {

    @NotNull
    @Size(min = 2, max = 10, message = "Size.firstName.length")
    private String firstName;

    @NotNull
    @Size(min = 2, max = 10)
    private String lastName;

    public User() {};

    public User(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

...
}

和相关配置相关的jsp文件如下，

WebConfig.java

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"spittr.web", "spittr.data"})
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }

    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        messageSource.setBasename("/WEB-INF/messages/");
        return messageSource;
    }

    @Bean
    public LocalValidatorFactoryBean validatorFactory() {
        LocalValidatorFactoryBean factoryBean = new LocalValidatorFactoryBean();
        factoryBean.setValidationMessageSource(messageSource());
        return factoryBean;
    }

    @Override
    public Validator getValidator() {
        return validatorFactory();
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

registerForm.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="sf" %>
<%@ page session="false" %>

<html>
    <head>
        <title>Spittr</title>
        <link href="<c:url value="/resources/css/user.css" />" rel="stylesheet">
    </head>
    <body>
        <h1>Register</h1>
        <sf:form method="POST" commandName="user">
            First Name: <sf:input path="firstName"/>
                        <sf:errors path="firstName" cssClass="error"/><br/>
            Last Name: <sf:input path="lastName"/>
                       <sf:errors path="lastName" cssClass="error"/><br/>
            <input type="submit" value="Register">
        </sf:form>
    </body>
</html>

ValidationMessages.properties

firstName.size=First Name must be between {min} and {max} charatecters long.

而ValidationMessages.properties低于

- webapp
  - WEB-INF
    - messages
      - ValidationMessages.properties

因此，正如我所说，如果 firstName 无效，则不会呈现错误消息并显示 "Size.firstName.length" 的原始字符串。

Answer 1

Spring 将消息查找委托给已配置的 MessageSource 它不为此使用 ValidationMessages.properties。（这就是默认的 bean 验证所做的！）。

但是您的 MessageSource 配置是错误的。 baseName should be a file name NOT a directory. Next you are using a ResourceBundleMessageSource which is only capable of loading files from the classpath。重新配置您的 MessageSource.

@Bean
public MessageSource messageSource() {
    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
    messageSource.setBasename("messages");
    return messageSource;
}

现在将您的 ValidationMessages.properties 重命名为 messages.properties 并将其放入 src\main\resources\。

spring-mvc @Size注解没有正确解析错误信息

spring-mvc @Size annotation does not resolve error message correctly

java

spring

jsp

spring-mvc

bean-validation