Spring-Data-Rest 验证器

Question

我一直在尝试将 spring 验证器添加到 spring-data-rest 项目中。

我跟随并通过此链接设置“入门”应用程序：http://spring.io/guides/gs/accessing-data-rest/

...现在我正在尝试按照此处的文档添加自定义 PeopleValidator： http://docs.spring.io/spring-data/rest/docs/2.1.0.RELEASE/reference/html/validation-chapter.html

我的自定义 PeopleValidator 看起来像

package hello;

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

public class PeopleValidator implements Validator {
    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }

    @Override
    public void validate(Object target, Errors errors) {
        errors.reject("DIE");
    }
}

...我的 Application.java 类现在看起来像这样

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;

@Configuration
@EnableJpaRepositories
@Import(RepositoryRestMvcConfiguration.class)
@EnableAutoConfiguration
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public PeopleValidator beforeCreatePeopleValidator() {
        return new PeopleValidator();
    }
}

我希望发布到http://localhost:8080/people URL 会导致某种错误，因为 PeopleValidator 拒绝所有内容。但是，不会抛出任何错误，也不会调用验证器。

我也尝试过手动设置验证器，如 spring-data-rest 文档的第 5.1 节所示。

我错过了什么？

Answer 1

有点摸不着头脑 - 我没用过spring-data-rest。但是，在阅读了您正在遵循的教程之后，我认为问题在于您需要 PersonValidator 而不是 PeopleValidator。相应地重命名所有内容：

PersonValidator

package hello;

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

public class PersonValidator implements Validator {
    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }

    @Override
    public void validate(Object target, Errors errors) {
        errors.reject("DIE");
    }
}

应用程序

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;

@Configuration
@EnableJpaRepositories
@Import(RepositoryRestMvcConfiguration.class)
@EnableAutoConfiguration
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public PersonValidator beforeCreatePersonValidator() {
        return new PersonValidator();
    }
}

Answer 2

因此，“保存”之前/之后的事件似乎只在 PUT 和 PATCH 上触发。发布时，会触发之前/之后的“创建”事件。

我使用configureValidatingRepositoryEventListener 覆盖再次尝试手动方式，它成功了。我不确定我在工作中所做的与在家中所做的不同。我明天得看看。

如果其他人对它为什么行不通有什么建议，我当然很想听。

为了记录，下面是新的 Application.java 类的样子。

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.rest.core.event.ValidatingRepositoryEventListener;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;

@Configuration
@EnableJpaRepositories
@Import(RepositoryRestMvcConfiguration.class)
@EnableAutoConfiguration
public class Application extends RepositoryRestMvcConfiguration {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    protected void configureValidatingRepositoryEventListener(ValidatingRepositoryEventListener validatingListener) {
        validatingListener.addValidator("beforeCreate", new PeopleValidator());
    }
}

Answer 3

看起来该功能目前尚未实现（2.3.0），不幸的是事件名称没有常量，否则下面的解决方案不会那么脆弱。

Configuration 使用正确的事件将所有正确命名的 Validator bean 添加到 ValidatingRepositoryEventListener。

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.event.ValidatingRepositoryEventListener;
import org.springframework.validation.Validator;

@Configuration
public class ValidatorRegistrar implements InitializingBean {

    private static final List<String> EVENTS;
    static {
        List<String> events = new ArrayList<String>();
        events.add("beforeCreate");
        events.add("afterCreate");
        events.add("beforeSave");
        events.add("afterSave");
        events.add("beforeLinkSave");
        events.add("afterLinkSave");
        events.add("beforeDelete");
        events.add("afterDelete");
        EVENTS = Collections.unmodifiableList(events);
    }

    @Autowired
    ListableBeanFactory beanFactory;

    @Autowired
    ValidatingRepositoryEventListener validatingRepositoryEventListener;

    @Override
    public void afterPropertiesSet() throws Exception {
        Map<String, Validator> validators = beanFactory.getBeansOfType(Validator.class);
        for (Map.Entry<String, Validator> entry : validators.entrySet()) {
            EVENTS.stream().filter(p -> entry.getKey().startsWith(p)).findFirst()
                    .ifPresent(p -> validatingRepositoryEventListener.addValidator(p, entry.getValue()));
        }
    }
}

Answer 4

另一种方法是使用此处指定的带注释的处理程序 http://docs.spring.io/spring-data/rest/docs/2.1.0.RELEASE/reference/html/events-chapter.html#d5e443

这是一个如何使用带注释的处理程序的示例：

import gr.bytecode.restapp.model.Agent;
import org.springframework.data.rest.core.annotation.HandleBeforeCreate;
import org.springframework.data.rest.core.annotation.HandleBeforeSave;
import org.springframework.data.rest.core.annotation.RepositoryEventHandler;
import org.springframework.stereotype.Component;

@Component
@RepositoryEventHandler(Agent.class)
public class AgentEventHandler {

    public static final String NEW_NAME = "**modified**";

    @HandleBeforeCreate
    public void handleBeforeCreates(Agent agent) {
            agent.setName(NEW_NAME);
    }

    @HandleBeforeSave
    public void handleBeforeSave(Agent agent) {
        agent.setName(NEW_NAME + "..update");
    }
}

示例来自github，为简洁起见进行了编辑。