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我正在嘗試創建可由所有DAO擴展的BaseDAO接口。該項目使用mongodb的spring數據。問題是，如果我讓所有單獨的DAO擴展MongoRepository並且不寫一個Implementation類，那麼一切正常。但是，如果我嘗試將MongoRepository添加到帶有泛型的BaseDAO接口，則應用程序不再工作，因爲實例化SimpleMongoRepository所需的參數爲空。這是我的代碼至今：如何從spring-data mongodb擴展SimpleMongoRepository？
BaseDAO.java
import com.test.mongodb.BaseEntity;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.NoRepositoryBean;
import java.io.Serializable;
@NoRepositoryBean
public 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;
@NoRepositoryBean
public 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;
@Repository
public interface UserDAO extends BaseDAO<User, String> {}
UserDAOImpl.java
import com.test.mongodb.User;
import org.springframework.stereotype.Repository;
@Repository
public class UserDAOImpl extends BaseDAOImpl<User, String> implements UserDAO {
public UserDAOImpl(){
super(User.class);
}
}
的applicationContext.xml
<?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()));
}
}
所以，當我運行它，我得到了BaseDAOImpl因爲NPE mongoTemplate和entityInformationCreator都是nul湖我如何加載它們？我還查看了Spring MongoDB參考文檔，但它主要說遵循其他類型存儲庫的文檔。我能在網上找到的唯一東西就是創建一個工廠bean。於是，我與嘗試，以及：
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;
@NoRepositoryBean
public 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;
}
}
}
，並改變了applicationContext.xml的有：
<mongo:repositories base-package="com.test.mongodb.repo"
factory-class="com.test.mongodb.repo.MongoRepoFactoryBean"/>
但是，這並不工作。我也嘗試過使用JavaConfig，但我不知道如何在使用註釋進行配置時設置工廠類。我究竟做錯了什麼？ SimpleMongoRepository不帶默認構造函數。注入靜態字段是否存在問題？
不是在
對不起，我只是瀏覽了一下你的XML配置文件，並認爲是這樣，工廠配置似乎已經被流出文本字段的代碼覆蓋了。改編我的答案。 –