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我正在嘗試創(chuàng)建一個(gè)可以由所有DAO擴(kuò)展的BaseDAO接口.該項(xiàng)目使用mongodb的spring-data.問題是,如果我讓所有單獨(dú)的DAO擴(kuò)展MongoRepository而不是編寫實(shí)現(xiàn)類,那么一切正常.但是如果我嘗試使用泛型將MongoRepository添加到BaseDAO接口,則該應(yīng)用程序不再起作用,因?yàn)閷?shí)例化SimpleMongoRepository所需的參數(shù)為null.這是我到目前為止的代碼：

BaseDAO.java

import com.test.mongodb.BaseEntity;import org.springframework.data.mongodb.repository.MongoRepository;import org.springframework.data.repository.NoRepositoryBean;import java.io.Serializable;@NoRepositoryBeanpublic interface BaseDAO<T extends BaseEntity, ID extends Serializable> extends         MongoRepository<T, ID> {    public T getTestObject(ID id);}

BaseDAOImpl.java

import com.test.mongodb.BaseEntity;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.mongodb.core.MongoTemplate;import org.springframework.data.mongodb.repository.query.EntityInformationCreator;import org.springframework.data.mongodb.repository.query.MongoEntityInformation;import org.springframework.data.mongodb.repository.support.SimpleMongoRepository;import org.springframework.data.repository.NoRepositoryBean;import java.io.Serializable;@NoRepositoryBeanpublic class BaseDAOImpl<T extends BaseEntity, ID extends Serializable> extends     SimpleMongoRepository<T,        ID> implements BaseDAO<T, ID> {    @Autowired    private static MongoTemplate mongoTemplate;    @Autowired    private static EntityInformationCreator entityInformationCreator;    public BaseDAOImpl(Class<T> type){        super((MongoEntityInformation<T, ID>)     entityInformationCreator.getEntityInformation(type), mongoTemplate);    }    @Override    public T getTestObject(ID id){        return findOne(id);    }}

UserDAO.java

import com.test.mongodb.User;import org.springframework.stereotype.Repository;@Repositorypublic interface UserDAO extends BaseDAO<User, String> {}

UserDAOImpl.java

import com.test.mongodb.User;import org.springframework.stereotype.Repository;@Repositorypublic class UserDAOImpl extends BaseDAOImpl<User, String> implements UserDAO {    public UserDAOImpl(){        super(User.class);    }}

applicationContext.xml中

    <?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns="http://www.springframework.org/schema/beans"       xmlns:mongo="http://www.springframework.org/schema/data/mongo"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd    http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.1.xsd">    <!-- MongoFactoryBean instance -->    <mongo:mongo host="localhost" port="27017" />    <mongo:db-factory dbname="bank" mongo-ref="mongo" />    <!-- MongoTemplate instance -->    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />    </bean>    <bean id="mappingContext" class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />    <bean id="entityInformationCreator" class="org.springframework.data.mongodb.repository.support.DefaultEntityInformationCreator">        <constructor-arg name="mappingContext" ref="mappingContext" />    </bean>    <mongo:repositories base-package="com.test.mongodb.repo"/></beans>

App.java

public class App {    public static void main(String[] args) {        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");        UserRepository userRepository = context.getBean("userRepository", UserRepository.class);        User user = new User("Test User");        userRepository.save(user);        String id = user.getId();        System.out.println(id);        System.out.println(userRepository.getTestObject(user.getId()));    }}

因此,當(dāng)我運(yùn)行它時(shí),我在BaseDAOImpl中得到一個(gè)NPE,因?yàn)閙ongoTemplate和entityInformationCreator都是null.如何加載它們？我還查看了Spring MongoDB參考文檔,但它主要是說要遵循其他類型的存儲(chǔ)庫的文檔.我在那里和網(wǎng)上其他地方唯一能找到的就是創(chuàng)建一個(gè)工廠bean.所以我也試過了：

MongoRepoFactoryBean.java

import org.springframework.data.mongodb.core.MongoTemplate;import org.springframework.data.mongodb.repository.MongoRepository;import org.springframework.data.mongodb.repository.support.MongoRepositoryFactory;import org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean;import org.springframework.data.repository.NoRepositoryBean;import org.springframework.data.repository.core.support.RepositoryFactorySupport;import java.io.Serializable;@NoRepositoryBeanpublic class MongoRepoFactoryBean<T extends MongoRepository<?,?>, ID extends    Serializable> extends MongoRepositoryFactoryBean {    protected RepositoryFactorySupport createRepositoryFactory(Class<T> clazz, MongoTemplate mongoTemplate) {        return new MongoRepoFactory(clazz, mongoTemplate);    }    private static class MongoRepoFactory extends MongoRepositoryFactory {        private Class clazz;        private MongoTemplate mongoTemplate;        public MongoRepoFactory(Class clazz, MongoTemplate mongoTemplate) {            super(mongoTemplate);            this.mongoTemplate = mongoTemplate;            this.clazz = clazz;        }        public Object getTargetRepository() {            return new BaseDAOImpl(clazz);        }        public Class<?> getRepositoryBaseClass() {            return BaseDAOImpl.class;        }    }}

并使用以下命令更改了applicationContext.xml：

<mongo:repositories base-package="com.test.mongodb.repo"                    factory-class="com.test.mongodb.repo.MongoRepoFactoryBean"/>

但這也不起作用.我也嘗試使用JavaConfig,但是在使用注釋進(jìn)行配置時(shí)我不知道如何設(shè)置工廠類.我究竟做錯(cuò)了什么？ SimpleMongoRepository沒有默認(rèn)構(gòu)造函數(shù).注入靜態(tài)字段有問題嗎？

解決方法:

參考文檔已過時(shí),未反映spring-data-mongodb 1.1.1.RELEASE的更改.

我和你有同樣的問題,這就是我解決它的方法.

請注意,我使用的是MongoConfig類和應(yīng)用程序上下文XML,但您確實(shí)不需要兩者,我只是決定這樣做來舉例說明它們的用法.

MongoConfig類:(你也可以通過spring app context XML來做到這一點(diǎn))

@Configurationpublic class MongoConfig extends AbstractMongoConfiguration {    @Override    protected String getDatabaseName() {        return "myDb";    }    @Override    @Bean    public Mongo mongo() throws Exception {        return new Mongo("localhost");    }}

Spring App Context XML：

<!-- You can also expose the bean as a method in the MongoConfig class --><bean id="mongoRepositoryFactory" class="org.springframework.data.mongodb.repository.support.MongoRepositoryFactory">    <!-- mongoTemplate comes from AbstractMongoConfiguration -->    <constructor-arg ref="mongoTemplate" /></bean><context:annotation-config /><context:component-scan base-package="com.example.domain" /><mongo:repositories base-package="com.example.domain.repository" mongo-template-ref="mongoTemplate" />

我的repository / dao類：

@Repositorypublic class MyBeanDao extends SimpleMongoRepository<MyBean, String> {    public MyBeanDao(MongoEntityInformation<MyBean, String> metadata, MongoOperations mongoOperations) {        super(metadata, mongoOperations);    }    @Autowired    public MyBeanDao(MongoRepositoryFactory factory, MongoOperations mongoOperations) {        this(factory.<MyBean, String>getEntityInformation(MyBean.class), mongoOperations);    }    ... // more stuff}

我知道這真的很丑,只適用于Java 6,但由于getEntityInformation()的返回類型是完全無界限的,所以它或者ID類型是Serializable而不是你的實(shí)際ID類型,并且每次你都進(jìn)行顯式轉(zhuǎn)換需要它.

我希望有一個(gè)更清潔的方式,但我已經(jīng)看了很長一段時(shí)間通過API甚至源代碼,并沒有想出一個(gè)更好的方法來做到這一點(diǎn),而沒有提出你自己的一些彈簧數(shù)據(jù)的實(shí)現(xiàn)-mongodb課程.

希望能幫助到你.