Mongodb总结4-Spring环境使用Mongodb

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前几次的例子，要么是Shell，要么是普通Java应用程序的例子。
实际情况，是要在Spring的项目里用，因此需要做一些改造。

1.配置文件
C:\hanhai\config\mongodb.properties
mongodb.host=172.17.100.150
mongodb.port=27017
mongodb.db=zrb

2.配置文件对应的实体类

 public class MongodbConfig {private String host;private String port;private String db;}

3.Spring扫描配置文件

<context:property-placeholderlocation="file:${zhaorongbao.config_path}/config/mongodb.properties"ignore-unresolvable="true" />

4.属性到实体类

<bean id="mongodbConfig" class="com.hanhai.zrb.api.mongodb.MongodbConfig">    <property name="host" value="${mongodb.host}"></property>    <property name="port" value="${mongodb.port}"></property>    <property name="db" value="${mongodb.db}"></property></bean>

5.Spring工具类，获得容器中的对象
需要扫描这个类SpringContextUtil
<context:component-scan base-package="com.hanhai.zrb.api.mongodb" />
SpringContextUtil在com.hanhai.zrb.api.mongodb这个包中。

@Componentpublic class SpringContextUtil implements ApplicationContextAware{private static ApplicationContext ctx;@Overridepublic void setApplicationContext(ApplicationContext applicationContext)throws BeansException {this.ctx = applicationContext;}public static ApplicationContext getCtx(){return ctx;}public static Object getBean(String name) throws BeansException {         return ctx.getBean(name); } }

6.SpringMVC中使用。
@

Controller@RequestMapping("mongodb")public class MongodbTestController extends BaseController {@RequestMapping("test")public void test(HttpServletResponse response) throws IOException {DB db = MongoUtil.db();ProjectDetail projectDetail = buildProjectDetail();DBCollection projectDetailCollection = db.getCollection("projectDetail");}

7.MongoUtil工具类。

import java.net.UnknownHostException;import org.apache.log4j.Logger;import com.mongodb.DB;import com.mongodb.Mongo;public class MongoUtil {public static final int DEFAULT_PORT = 27017;public static final String DEFAULT_HOST = "172.17.100.150";public static Logger log = Logger.getLogger(MongoUtil.class);private static Mongo instance;//@Resource(name="mongodbConfig")//private static MongodbConfig mongodbConfig;//没有直接注入private static MongodbConfig config = null;public static Mongo mongo() {//使用工具方法获得容器中的对象Object object=SpringContextUtil.getBean("mongodbConfig");if(object instanceof MongodbConfig){config = (MongodbConfig)object;}else{log.error("Mongodb config error~");}try {if (instance == null) {instance = new Mongo(config.getHost(), Integer.parseInt(config.getPort()));}} catch (UnknownHostException e) {e.printStackTrace();}return instance;}public static DB db(){Mongo mongo = MongoUtil.mongo();DB db = mongo.getDB(config.getDb());if(db == null){throw new RuntimeException("Mongo db is null");}return db;}public static void close() {if (instance != null) {instance.close();}}}

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