Question

我有一个包含枚举属性的类。

public class Car{
    private UserAction action;
    //getters setters
}

我想从/向Mongo db保存/读取它。我正在使用Spring框架。

SpringConfig.xml

<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:mongo="http://www.springframework.org/schema/data/mongo"
    xsi:schemaLocation="http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/data/mongo
    http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <mongo:mongo host="127.0.0.1" port="27017" />
    <mongo:db-factory dbname="dbName" />

    <bean id="mappingContext"
        class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />

    <bean id="defaultMongoTypeMapper"
        class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
        <constructor-arg name="typeKey"><null/></constructor-arg>
    </bean>

    <bean id="mappingMongoConverter"
        class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
        <constructor-arg name="mappingContext" ref="mappingContext" />
        <property name="typeMapper" ref="defaultMongoTypeMapper" />
    </bean>

    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
        <constructor-arg name="mongoConverter" ref="mappingMongoConverter" />
    </bean>

<!--CODE BELOW CASES PROBLEMS-->

    <mongo:mapping-converter id="mappingConverter">
        <mongo:custom-converters>
            <mongo:converter>
                <bean class="myapp.mongo.converters.UserActionReadConverter"/>
            </mongo:converter>
            <mongo:converter>
                <bean class="myapp.mongo.converters.UserActionWriteConverter"/>
            </mongo:converter>
        </mongo:custom-converters>
    </mongo:mapping-converter>

</beans>

UserActionReadConverter.java

package myapp.mongo.converters;

import myapp.model.UserAction;
import com.mongodb.DBObject;
import org.springframework.core.convert.converter.Converter;

public class UserActionReadConverter implements Converter<DBObject, UserAction> {

    public UserAction convert(DBObject source) {
        String val = (String) source.get("value");
        return (val.equals("PROCESSED_BY_USER" ) ? UserAction.PROCESSED_BY_USER : UserAction.UNPROCESSED_BY_USER);
    }
}

UserActionWriteConverter.java

package myapp.mongo.converters;

import myapp.model.UserAction;
import org.springframework.core.convert.converter.Converter;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;

public class UserActionWriteConverter implements Converter<UserAction, DBObject> {

    public DBObject convert(UserAction userAction) {
        DBObject dbo = new BasicDBObject();
        dbo.put("value", userAction.toString());
        return dbo;
    }
}

操作初始化

...
ApplicationContext ctx = new GenericXmlApplicationContext("SpringConfig.xml");
this.operations = (MongoOperations) ctx.getBean(beamName);
...

我不知道如何正确地将转换器映射到config .xml。它返回错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.validation.beanvalidation.LocalValidatorFactoryBean#0': Invocation of init method failed; nested exception is javax.validation.ValidationException: Unable to create a Configuration, because no Bean Validation provider could be found. Add a provider like Hibernate Validator (RI) to your classpath.

第二个问题是。我想转换简单的枚举，为此我使用了＃34;支持识别器＆＃34;值。我可以在不使用它的情况下转换枚举，数据库中的数据将存储为{car.userAction：＆＃34;数据值＆＃34;而不是{car.value.userAction：＆＃34;数据值＆＃34;谢谢。

Answer 1

缺少验证器库。

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.2.3.Final</version>
</dependency>

导入自己的枚举转换器

1 个答案: