Java 带弹簧的MongoDb工厂_Java_Spring_Mongodb_Spring Mvc_Dependency Injection

Java 带弹簧的MongoDb工厂

java spring mongodb spring-mvc dependency-injection

Java 带弹簧的MongoDb工厂,java,spring,mongodb,spring-mvc,dependency-injection,Java,Spring,Mongodb,Spring Mvc,Dependency Injection,我想将MongoDB与Spring一起使用。我正试图在我的DAO主类中注入MongoDbFactory 我不想使用MongoTemplate，因为我需要使用MongoDB驱动程序当我尝试运行jUnit测试时，为了测试我的DAO类，我在工厂中得到了一个NullPointerExection 我想这是我注射的问题我的应用程序配置： <bean id="mongoFactoryBean" class="org.springframework.data.mongodb.core.MongoF

我想将MongoDB与Spring一起使用。我正试图在我的DAO主类中注入MongoDbFactory

我不想使用MongoTemplate，因为我需要使用MongoDB驱动程序

当我尝试运行jUnit测试时，为了测试我的DAO类，我在工厂中得到了一个NullPointerExection

我想这是我注射的问题

我的应用程序配置：

<bean id="mongoFactoryBean" class="org.springframework.data.mongodb.core.MongoFactoryBean">
    <property name="host" value="127.0.0.1" />
    <property name="port" value="27017"/>   
</bean>

<bean id="mongoDbFactory"
    class="org.springframework.data.mongodb.core.SimpleMongoDbFactory">
    <constructor-arg name="mongo" ref="mongoFactoryBean" />
    <constructor-arg name="databaseName" value="agence_voyage" />
</bean>

<bean id="dao" class="dao.daoImpl.DaoImpl">
    <property name="mongoFactory" ref="mongoDbFactory" />
</bean>

public class DaoImpl implements Dao {
 private MongoDbFactory mongoFactory;
 private DB db;

 @Required
 public void setMongoFactory(MongoDbFactory myMongoFactory){
     this.mongoFactory= myMongoFactory;
 }

//TODO development mongodb://localhost
public void connect() throws UnknownHostException {
    try{
        this.db = mongoFactory.getDb("agence_voyage"); //NullPointer here
    }
    catch(DataAccessException d){
        System.out.println(d);
    }
}

public int getVoyageCount(String collection) {
    DBCollection col = db.getCollection(collection);
    return (int) col.count();
}
}

public class TestDao {

@Test
public void test() {
    Dao test = new DaoImpl();
    try {
        test.connect();
    } catch (UnknownHostException e) {
        System.out.println(e);
        assertTrue(false);
    }
    assertTrue(test.getVoyageCount("voyage")== 1);
}

}

然后是我的小测试：

<bean id="mongoFactoryBean" class="org.springframework.data.mongodb.core.MongoFactoryBean">
    <property name="host" value="127.0.0.1" />
    <property name="port" value="27017"/>   
</bean>

<bean id="mongoDbFactory"
    class="org.springframework.data.mongodb.core.SimpleMongoDbFactory">
    <constructor-arg name="mongo" ref="mongoFactoryBean" />
    <constructor-arg name="databaseName" value="agence_voyage" />
</bean>

<bean id="dao" class="dao.daoImpl.DaoImpl">
    <property name="mongoFactory" ref="mongoDbFactory" />
</bean>

public class DaoImpl implements Dao {
 private MongoDbFactory mongoFactory;
 private DB db;

 @Required
 public void setMongoFactory(MongoDbFactory myMongoFactory){
     this.mongoFactory= myMongoFactory;
 }

//TODO development mongodb://localhost
public void connect() throws UnknownHostException {
    try{
        this.db = mongoFactory.getDb("agence_voyage"); //NullPointer here
    }
    catch(DataAccessException d){
        System.out.println(d);
    }
}

public int getVoyageCount(String collection) {
    DBCollection col = db.getCollection(collection);
    return (int) col.count();
}
}

public class TestDao {

@Test
public void test() {
    Dao test = new DaoImpl();
    try {
        test.connect();
    } catch (UnknownHostException e) {
        System.out.println(e);
        assertTrue(false);
    }
    assertTrue(test.getVoyageCount("voyage")== 1);
}

}

你有什么解决办法吗？我肯定这是个愚蠢的错误，但我没发现

提前谢谢

您的测试似乎没有以任何方式连接到Spring上下文。您实际上是自己创建了对象，而不是获得Spring管理的bean

Dao test = new DaoImpl();

为什么Spring会对这个对象做任何事情

将这些注释添加到类中

@ContextConfiguration(locations = "yourfile.xml")
@RunWith(SpringJUnit4ClassRunner.class)

并直接注入

DaoImpl

bean

@Autowired
private Dao test;

然后在测试中使用它

阅读Spring文档中的。