mongoDB 实现主从读写分离实现的实例代码

(编辑：jimmy 日期: 2024/12/23 浏览：2)

mongoDB主从读写分离

MongoDB官方已经不建议使用主从模式了，替代方案是采用副本集的模式，点击查看。如果您的环境不符合副本集模式可参考本文，来实现主从读写分离。

resources.properties

mongodb_read.host=10.0.0.45
mongodb_read.port=27017
mongodb_read.apname=ecsp
mongodb_read.username=
mongodb_read.password=

mongodb_write.host=10.0.0.46
mongodb_write.port=27017
mongodb_write.apname=ecsp
mongodb_write.username=
mongodb_write.password=

mongo_config.xml

<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-2.0.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-2.0.xsd">

  <!-- 连接数据库信息 -->
  <bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
      <list>
        <value>classpath:resources.properties</value>
      </list>
    </property>
  </bean>
  <!-- 读start -->
  <bean id="mongoServerReadAddress" class="com.mongodb.ServerAddress">
    <constructor-arg value="${mongodb_read.host}"></constructor-arg>
    <constructor-arg value="${mongodb_read.port}"></constructor-arg>
  </bean>
  <bean id="chexunMongoReadOptions" class="com.ecsp.chexun.mongo.ChexunMongoOptions">
    <property name="username" value="${mongodb_read.username}" />
    <property name="password" value="${mongodb_read.password}" />
    <property name="dbname" value="${mongodb_read.apname}" />
    <property name="connectionsPerHost" value="100" />
    <property name="threadsAllowedToBlockForConnectionMultiplier"
      value="5" />
    <property name="slaveOk" value="true" />
  </bean>
  <bean id="mongo_read" class="com.mongodb.Mongo">
    <constructor-arg ref="mongoServerReadAddress"></constructor-arg>
    <constructor-arg ref="chexunMongoReadOptions"></constructor-arg>
  </bean>
  <!-- 读end -->

  <!-- 写start -->
  <bean id="mongoServerWriteAddress" class="com.mongodb.ServerAddress">
    <constructor-arg value="${mongodb_write.host}"></constructor-arg>
    <constructor-arg value="${mongodb_write.port}"></constructor-arg>
  </bean>
  <bean id="chexunMongoWriteOptions" class="com.ecsp.chexun.mongo.ChexunMongoOptions">
    <property name="username" value="${mongodb_write.username}" />
    <property name="password" value="${mongodb_write.password}" />
    <property name="dbname" value="${mongodb_write.apname}" />
    <property name="connectionsPerHost" value="100" />
    <property name="threadsAllowedToBlockForConnectionMultiplier"
      value="5" />
  </bean>
  <bean id="mongo_write" class="com.mongodb.Mongo">
    <constructor-arg ref="mongoServerWriteAddress"></constructor-arg>
    <constructor-arg ref="chexunMongoWriteOptions"></constructor-arg>
  </bean>
  <!-- 写end -->

  <!-- 链接对象注入start -->
  <bean id="mongoHelper" class="com.ecsp.chexun.mongo.MongoHelper">
    <constructor-arg ref="mongo_read"></constructor-arg>
    <constructor-arg ref="mongo_write"></constructor-arg>
  </bean>

  <!-- 链接对象注入end -->
</beans>

web.xml

<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>
    /WEB-INF/classes/mongo_config.xml
  </param-value>
</context-param>

实体层ChexunMongoOptions.Java

package com.ecsp.chexun.mongo;

import javax.net.SocketFactory;

import com.mongodb.DBDecoderFactory;
import com.mongodb.MongoOptions;

/**
 * Mongo配置类
 * 
 * @author vincent.he
 * @version 1.0, Created on 2012-3-12
 * 
 */
public class ChexunMongoOptions extends MongoOptions{
  private String username;
  private String password;
  private String dbname;

  public ChexunMongoOptions(){
    super();
  }

  public void setDescription(String description) {
    this.description = description;
  }

  public void setConnectionsPerHost(int connectionsPerHost) {
    this.connectionsPerHost = connectionsPerHost;
  }

  public void setThreadsAllowedToBlockForConnectionMultiplier(
      int threadsAllowedToBlockForConnectionMultiplier) {
    this.threadsAllowedToBlockForConnectionMultiplier = threadsAllowedToBlockForConnectionMultiplier;
  }

  public void setMaxWaitTime(int maxWaitTime) {
    this.maxWaitTime = maxWaitTime;
  }

  public void setConnectTimeout(int connectTimeout) {
    this.connectTimeout = connectTimeout;
  }

  public void setSocketTimeout(int socketTimeout) {
    this.socketTimeout = socketTimeout;
  }

  public void setSocketKeepAlive(boolean socketKeepAlive) {
    this.socketKeepAlive = socketKeepAlive;
  }

  public void setAutoConnectRetry(boolean autoConnectRetry) {
    this.autoConnectRetry = autoConnectRetry;
  }

  public void setMaxAutoConnectRetryTime(long maxAutoConnectRetryTime) {
    this.maxAutoConnectRetryTime = maxAutoConnectRetryTime;
  }

  public void setSlaveOk(boolean slaveOk) {
    this.slaveOk = slaveOk;
  }

  public void setDbDecoderFactory(DBDecoderFactory dbDecoderFactory) {
    this.dbDecoderFactory = dbDecoderFactory;
  }

  public void setSafe(boolean safe) {
    this.safe = safe;
  }

  public void setW(int w) {
    this.w = w;
  }

  public void setWtimeout(int wtimeout) {
    this.wtimeout = wtimeout;
  }

  public void setFsync(boolean fsync) {
    this.fsync = fsync;
  }

  public void setJ(boolean j) {
    this.j = j;
  }

  public void setSocketFactory(SocketFactory socketFactory) {
    this.socketFactory = socketFactory;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public String getDbname() {
    return dbname;
  }

  public void setDbname(String dbname) {
    this.dbname = dbname;
  }
}

Java dao层

package com.ecsp.chexun.mongo;
import java.util.List;


import com.mongodb.BasicDBObject;
import com.mongodb.CommandResult;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.Mongo;

/**
 * mongo 操做方法
 * @author zhanglibing
 * 
 */
public class MongoHelper {

  private Mongo mongo;
  private Mongo mongo_read;
  private Mongo mongo_write;
  private String dataBaseName = "cxec";
  public MongoHelper(){}
  public MongoHelper(Mongo mongo,Mongo mongo_read,Mongo mongo_write){
    this.mongo = mongo;
    this.mongo_read = mongo_read;
    this.mongo_write = mongo_write;
  }
// public MongoHelper(String dbName){
//   dataBaseName = dbName;   
// }
  public int add(String collectionName,BasicDBObject dbObject){
//   DB db = MongoManager.getDB(dataBaseName); 
    DB db = mongo_write.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName); 
    return dbc.save(dbObject).getN();
  }
  //批量添加
  public int addAll( String collectionName,List<DBObject> list){
//   DB db = MongoManager.getDB(dataBaseName); 
    DB db = mongo_write.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName); 
    return dbc.insert(list).getN();
  }

  public int isExists(String collectionName,BasicDBObject query){
//   DB db = MongoManager.getDB(dataBaseName); 
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.find(query).size();   
  }

  public List<DBObject> get(String collectionName,BasicDBObject query){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.find(query).toArray();
  }

  public int getCount(String collectionName,BasicDBObject query){    
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.find(query).count();    
  }

  public List<DBObject> get(String collectionName,BasicDBObject query,BasicDBObject keys){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.find(query, keys).toArray();
  }

  /***
   * 获取mongo 中 collection 的值
   * @param collectionName
   * @param query 查询条件
   * @param keys  查询字段
   * @param batchSize 返回个数
   * @return
   */
  public List<DBObject> get(String collectionName,BasicDBObject query,BasicDBObject keys,BasicDBObject orderBy,int batchSize){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    if(orderBy != null){
      return dbc.find(query, keys).sort(orderBy).limit(batchSize).toArray(); 
    }
    return dbc.find(query, keys).limit(batchSize).toArray();
  }

  public List<DBObject> get(String collectionName,BasicDBObject query,BasicDBObject keys,BasicDBObject orderBy,int batchSize,int n){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    if(orderBy != null){
      return dbc.find(query, keys).sort(orderBy).limit(batchSize).skip(n).toArray(); 
    }
    return dbc.find(query, keys).limit(batchSize).toArray();
  }

  public List<DBObject> get(String collectionName,DBObject query,int batchSize){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);      
    return dbc.find(query).limit(batchSize).toArray();
  }
  public List<DBObject> get(String collectionName,int number){
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);  
    List<DBObject> dboList = dbc.find().skip(0).limit(number).toArray();
    return dboList;
  }
  public List<DBObject> get(String collectionName,BasicDBObject query,BasicDBObject orderBy,int n,int pageSize ){
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);  
    List<DBObject> dboList = dbc.find(query).sort(orderBy).skip(n).limit(pageSize).toArray();
    return dboList;
  }
  public List<DBObject> get(String collectionName,BasicDBObject query,int top ){
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);  
    List<DBObject> dboList = dbc.find(query).skip(0).limit(top).toArray();

    return dboList;
  }
  public List<DBObject> get(String collectionName,DBObject query,DBObject orderBy,int batchSize){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_read.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.find(query).sort(orderBy).limit(batchSize).toArray();
  }

  public int reomve(String collectionName,BasicDBObject o){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_write.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.remove(o).getN();
  }

  public int edit(String collectionName,BasicDBObject query,BasicDBObject update){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo_write.getDB(dataBaseName);
    DBCollection dbc = db.getCollection(collectionName);
    return dbc.update(query, update).getN();
    //return dbc.updateMulti(query, update).getN();
  }

  public int edit(String cmd){
//   DB db = MongoManager.getDB(dataBaseName);
    DB db = mongo.getDB(dataBaseName);
    CommandResult cmdResult = db.command(cmd);
    if(cmdResult.ok())
    {
      return 1;
    }
    return 0;
  }

// public DBCollection get(String collectionName){
////    DB db = MongoManager.getDB(dataBaseName);
//   DB db = mongo.getDB(dataBaseName);
//   return db.getCollection(collectionName);
// }
  public void setMongo(Mongo mongo) {
    this.mongo = mongo;
  }
  public void setMongo_read(Mongo mongo_read) {
    this.mongo_read = mongo_read;
  }
  public void setMongo_write(Mongo mongo_write) {
    this.mongo_write = mongo_write;
  }



}

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