Spring-data-mongodb Converter实现

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最新推荐文章于 2025-04-21 13:16:59 发布

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分类专栏： JAVA SpringMVC Mongodb

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本文详细介绍了如何在Spring Data MongoDB中使用Converter进行数据转换，通过配置XML文件来实现自定义类型转换，提升数据存储和读取的灵活性。

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Springxml增加配置：

	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
		<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
		<constructor-arg name="mongoConverter" ref="mappingConverter"/>
	</bean>
	
	<mongo:mapping-converter >
	    <mongo:custom-converters>
	      <mongo:converter>
	        <bean class="com.mongo.MyConverter"/>
	      </mongo:converter>
	      <mongo:converter>
	        <bean class="com.mongo.MyReadConverter"/>
	      </mongo:converter>
	    </mongo:custom-converters>
	</mongo:mapping-converter>

或者：

<mongo:mapping-converter>
	<mongo:custom-converters base-package="com.mongodb.converters"/>
</mongo:mapping-converter>

Java代码实现：

import org.springframework.core.convert.converter.Converter;

import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.util.JSON;

public class MyConverter implements Converter<SrUserWithBLOBs, DBObject> {

	@Override
	public DBObject convert(SrUserExtWithBLOBs arg0) {
		System.out.println("==================>>>converter");
		SrUserExtWithBLOBs srUserExtWithBLOBs = arg0;
		DBObject object = new BasicDBObject();
		object.put("_id", String.valueOf(srUserExtWithBLOBs.getId()));
		object.put("sruid", srUserExtWithBLOBs.getSruid());
		object.put("uid", srUserExtWithBLOBs.getUid());
		object.put("user_additionnal",
				JSON.parse(srUserExtWithBLOBs.getUserAdditional()));
		object.put("user_verify",
				JSON.parse(srUserExtWithBLOBs.getUserVerify()));
		return object;
	}

}

import org.springframework.core.convert.converter.Converter;

import com.mongodb.DBObject;

public class MyReadConverter
		implements Converter<DBObject, SrUserExtWithBLOBs> {

	@Override
	public SrUserExtWithBLOBs convert(DBObject source) {
		System.out.println("==================>>>converter");
		SrUserExtWithBLOBs srUserExtWithBLOBs = new SrUserExtWithBLOBs();
		srUserExtWithBLOBs
				.setId(Integer.valueOf(String.valueOf(source.get("_id"))));
		srUserExtWithBLOBs
				.setUid(Integer.valueOf(String.valueOf(source.get("uid"))));
		srUserExtWithBLOBs
				.setSruid(Integer.valueOf(String.valueOf(source.get("sruid"))));
		srUserExtWithBLOBs
				.setUserAdditional(source.get("user_additionnal").toString());
		srUserExtWithBLOBs.setUserVerify(source.get("user_verify").toString());

		return srUserExtWithBLOBs;
	}

}