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Spring Data MongoDB 简单使用

这篇文章,主要是作为一个记录,记录我一个小时之前搞定这个东西的兴奋心情。spring mongodb主要是mongodb-java-driver 进行了一些封装,然后可以配合强大的spring使用。我觉得可以简单把它看成一个mongo的”ORM”框架。通过我从星期五到星期天的捣腾,我发现熟悉spring 框架本身其实是最重要的。好下面直接上吧:

首先我在eclipse里面建了一个maven项目,你需要添加如下依赖信息(这里用到的spring框架是3.0.6.RELEASE版本):

<properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 <spring.version>3.0.6.RELEASE</spring.version>
 <slf4j.version>1.6.1</slf4j.version>
 </properties>

<dependencies>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>4.8.1</version>
 <scope>test</scope>
 </dependency>
 <dependency>
 <groupId>org.springframework.data</groupId>
 <artifactId>spring-data-mongodb</artifactId>
 <version>1.0.2.RELEASE</version>
 </dependency>
 <dependency>
 <groupId>log4j</groupId>
 <artifactId>log4j</artifactId>
 <version>1.2.16</version>
 </dependency>
 <dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-api</artifactId>
 <version>${slf4j.version}</version>
 </dependency>
 <dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>jcl-over-slf4j</artifactId>
 <version>${slf4j.version}</version>
 </dependency>
 <dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-log4j12</artifactId>
 <version>${slf4j.version}</version>
 </dependency>
 <!-- Spring dependencies -->
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-core</artifactId>
 <version>${spring.version}</version>
 <exclusions>
 <exclusion>
 <groupId>commons-logging</groupId>
 <artifactId>commons-logging</artifactId>
 </exclusion>
 </exclusions>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-test</artifactId>
 <version>${spring.version}</version>
 <scope>test</scope>
 <exclusions>
 <exclusion>
 <groupId>commons-logging</groupId>
 <artifactId>commons-logging</artifactId>
 </exclusion>
 </exclusions>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-context</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-aop</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>cglib</groupId>
 <artifactId>cglib</artifactId>
 <version>2.2</version>
 </dependency>
 <dependency>
 <groupId>org.mongodb</groupId>
 <artifactId>mongo-java-driver</artifactId>
 <version>2.8.0</version>
 </dependency>
 <dependency>
 <groupId>org.springframework.data</groupId>
 <artifactId>spring-data-commons-core</artifactId>
 <version>1.2.1.RELEASE</version>
 </dependency>
 </dependencies>

由于这里面的某些依赖可能maven中央仓库没有,所以请在pom里添加下面两个spring的仓库:

<repository>
 <id>spring-maven-release</id>
 <name>Spring Maven Release Repository</name>
 <url>http://maven.springframework.org/release</url>
 </repository>
 <repository>
 <id>spring-maven-milestone</id>
 <name>Spring Maven Milestone Repository</name>
 <url>http://maven.springframework.org/milestone</url>
 </repository>

下面进行我们的代码编写,首先我们需要一个简单的java POJO类:person.java用于存储人的信息,其有三个属性:id(和mongodb中的ObjectId对应),name-姓名,age-年龄。

package com.toozhao.mongo.bean;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

/**
 *
 * @author Junv
 *
 */
@Document
public class Person {

@Id
 private String id;
 private String name;
 private int age;

public Person() {

}

public Person(String name, int age) {
 this.name = name;
 this.age = age;
 }

public String getId() {
 return id;
 }

public String getName() {
 return name;
 }

public void setId(String id) {
 this.id = id;
 }

public void setName(String name) {
 this.name = name;
 }

public void setAge(int age) {
 this.age = age;
 }

public int getAge() {
 return age;
 }

@Override
 public String toString() {
 return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
 }

}

然后我们定义一个执行操作的接口,和其实现类,这里可以看做是一个dao模式。在接口中我们只定义了保存对象和查询一条记录两个方法。

package com.toozhao.mongo.repository;

import com.toozhao.mongo.bean.Person;
/**
 *
 * @author Junv
 *
 */
public interface MongoAction {

 public void saveObject(Person objToSave);

 public Person findObject(String id);

}

实现类:

package com.toozhao.mongo.repository;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Repository;

import com.toozhao.mongo.bean.Person;

@Repository
public class PersonActionImp implements MongoAction {

@Autowired
 MongoOperations operation;

public void saveObject(Person objToSave) {
 operation.insert(objToSave);

}

public Person findObject(String id) {
 return operation.findOne(new Query(Criteria.where("_id").is(id)),
 Person.class);

}

}

@repository,和@autowired是spring框架中的,主要功能是起到类似反射的作用吧,具体我还没弄得很清楚。

写一个有main方法的java类,对功能进行简单测试:

package com.toozhao.mongo;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.toozhao.mongo.bean.Person;
import com.toozhao.mongo.repository.MongoAction;

public class MainTest {

private static final Log log = LogFactory.getLog(MainTest.class);

public static void main(String[] args) {

log.info("initial -----------------");
 ConfigurableApplicationContext context = null;
 //实例化appliaction Context对象
 context = new ClassPathXmlApplicationContext(
 "META-INF/spring/applicationContext.xml");
 //获取一个MongoAction Bean,以便后面执行相关操作
 MongoAction action = context.getBean(MongoAction.class);
 Person person = new Person("Tom", 11);

 action.saveObject(person);
 log.info("结果为:" + action.findObject(person.getId()));

}

}

最后,贴出applicationContext文档,里面主要对mongodb进行了简单的配置,和设置了repository的扫描目录(和@repository对应)。

<?xml version="1.0" encoding="UTF-8"?>
<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">

 <context:annotation-config/>

<context:component-scan base-package="com.toozhao.mongo.repository">
 <context:exclude-filter type="annotation" expression="org.springframework.context.annotation.Configuration"/>
 </context:component-scan>

 <!-- Default bean name is 'mongo' -->
 <mongo:mongo host="localhost" port="27017">
 <mongo:options connections-per-host="8"
 threads-allowed-to-block-for-connection-multiplier="4"
 connect-timeout="1000"
 max-wait-time="1500"
 auto-connect-retry="true"
 socket-keep-alive="true"
 socket-timeout="1500"
 slave-ok="true"
 write-number="1"
 write-timeout="0"
 write-fsync="true"/>
 </mongo:mongo>
 <!-- xml 配置mongoTemplate-->
 <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
 <constructor-arg ref="mongo"/>
 <constructor-arg name="databaseName" value="junv"/>
 </bean>

 <!-- Use this post processor to translate any MongoExceptions thrown in @Repository annotated classes -->
 <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

</beans>

当然你还需要做的就是运行这个项目,我们需要在pom.xml里面添加如下代码,为你需要运行的类:

<plugin>
 <groupId>org.codehaus.mojo</groupId>
 <artifactId>exec-maven-plugin</artifactId>
 <version>1.1.1</version>
 <!-- 你需要执行的类, -->
 <configuration>
 <mainClass>com.toozhao.mongo.MainTest</mainClass>
 </configuration>
 </plugin>

最后,使用 mvn exec:java 就可以运行代码了,当然你在有main方法那个类,右键以java程序的方式也可以运行。结果就是你应该可以看到程序像数据库junv.person中插入了一条数据。

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