在SpringBoot中，我们可以通过引入 spring-boot-starter-data-mongodb 依赖来实现spring-data-mongodb 的自动配置。但是，默认情况下，该依赖并没有像使用MySQL或者Redis那样为我们提供连接池配置的功能。因此，我们需要自行重写 MongoDbFactory，实现MongoDB客户端连接的参数配置扩展。需要说明的是，MongoDB的客户端本身就是一个连接池，因此，我们只需要配置客户端即可。

一、引入依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.2.RELEASE</version>
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

二、配置文件

为了方便对Mongodb进行统一管理，我们将相关的配置抽取到 mongo-pool.properties 中，前缀为spring.data.mongodb（前缀可自己随意配置）：

spring.data.mongodb.address=172.16.250.234:27017,172.16.250.239:27017,172.16.250.240:27017
spring.data.mongodb.replica-set=rs0
spring.data.mongodb.database=test
spring.data.mongodb.username=admin
spring.data.mongodb.password=admin
 
# Configure spring.data.mongodbDB Pool
spring.data.mongodb.min-connections-per-host=10
spring.data.mongodb.max-connections-per-host=100
spring.data.mongodb.threads-allowed-to-block-for-connection-multiplier=5
spring.data.mongodb.server-selection-timeout=30000
spring.data.mongodb.max-wait-time=120000
spring.data.mongodb.max-connection-idel-time=0
spring.data.mongodb.max-connection-life-time=0
spring.data.mongodb.connect-timeout=10000
spring.data.mongodb.socket-timeout=0
spring.data.mongodb.socket-keep-alive=false
spring.data.mongodb.ssl-enabled=false
spring.data.mongodb.ssl-invalid-host-name-allowed=false
spring.data.mongodb.always-use-m-beans=false
spring.data.mongodb.heartbeat-socket-timeout=20000
spring.data.mongodb.heartbeat-connect-timeout=20000
spring.data.mongodb.min-heartbeat-frequency=500
spring.data.mongodb.heartbeat-frequency=10000
spring.data.mongodb.local-threshold=15
spring.data.mongodb.authentication-database=auth_dev

三、配置文件映射为JavaBean

为方便调用，将上述配置包装成一个配置实体类，代码如下:

import java.util.List;
 
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
 
@Component
@PropertySource(value = "classpath:mongo-pool.properties")
@ConfigurationProperties(prefix = "spring.data.mongodb")
public class MongoSettingsProperties {
 
	private List address;
	private String replicaSet;
	private String database;
	private String username;
	private String password;
	private Integer minConnectionsPerHost = 0;
	private Integer maxConnectionsPerHost = 100;
	private Integer threadsAllowedToBlockForConnectionMultiplier = 5;
	private Integer serverSelectionTimeout = 30000;
	private Integer maxWaitTime = 120000;
	private Integer maxConnectionIdleTime = 0;
	private Integer maxConnectionLifeTime = 0;
	private Integer connectTimeout = 10000;
	private Integer socketTimeout = 0;
	private Boolean socketKeepAlive = false;
	private Boolean sslEnabled = false;
	private Boolean sslInvalidHostNameAllowed = false;
	private Boolean alwaysUseMBeans = false;
	private Integer heartbeatConnectTimeout = 20000;
	private Integer heartbeatSocketTimeout = 20000;
	private Integer minHeartbeatFrequency = 500;
	private Integer heartbeatFrequency = 10000;
	private Integer localThreshold = 15;
	private String authenticationDatabase;
 
	// 省略Getters和Setters方法
 
}

四、覆盖MongoDbFactory

自定义创建一个MongoDbFactory用来替代Springboot为我们自动装配的MongoDbFactory，代码如下：

import java.util.ArrayList;
import java.util.List;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.SimpleMongoDbFactory;
 
import com.mongodb.MongoClient;
import com.mongodb.MongoClientOptions;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
 
@Configuration
public class MongoConfig {
 
	private static final Logger logger = LoggerFactory.getLogger(MongoConfig.class);
 
	// 覆盖容器中默认的MongoDbFacotry Bean
	@Bean
	@Autowired
	public MongoDbFactory mongoDbFactory(MongoSettingsProperties properties) {
 
		// 客户端配置（连接数，副本集群验证）
		MongoClientOptions.Builder builder = new MongoClientOptions.Builder();
		builder.connectionsPerHost(properties.getMaxConnectionsPerHost());
		builder.minConnectionsPerHost(properties.getMinConnectionsPerHost());
		if (properties.getReplicaSet() != null) {
			builder.requiredReplicaSetName(properties.getReplicaSet());
		}
		builder.threadsAllowedToBlockForConnectionMultiplier(
				properties.getThreadsAllowedToBlockForConnectionMultiplier());
		builder.serverSelectionTimeout(properties.getServerSelectionTimeout());
		builder.maxWaitTime(properties.getMaxWaitTime());
		builder.maxConnectionIdleTime(properties.getMaxConnectionIdleTime());
		builder.maxConnectionLifeTime(properties.getMaxConnectionLifeTime());
		builder.connectTimeout(properties.getConnectTimeout());
		builder.socketTimeout(properties.getSocketTimeout());
		// builder.socketKeepAlive(properties.getSocketKeepAlive());
		builder.sslEnabled(properties.getSslEnabled());
		builder.sslInvalidHostNameAllowed(properties.getSslInvalidHostNameAllowed());
		builder.alwaysUseMBeans(properties.getAlwaysUseMBeans());
		builder.heartbeatFrequency(properties.getHeartbeatFrequency());
		builder.minHeartbeatFrequency(properties.getMinHeartbeatFrequency());
		builder.heartbeatConnectTimeout(properties.getHeartbeatConnectTimeout());
		builder.heartbeatSocketTimeout(properties.getHeartbeatSocketTimeout());
		builder.localThreshold(properties.getLocalThreshold());
		MongoClientOptions mongoClientOptions = builder.build();
 
		// MongoDB地址列表
		List serverAddresses = new ArrayList();
		for (String address : properties.getAddress()) {
			String[] hostAndPort = address.split(":");
			String host = hostAndPort[0];
			Integer port = Integer.parseInt(hostAndPort[1]);
			ServerAddress serverAddress = new ServerAddress(host, port);
			serverAddresses.add(serverAddress);
		}
 
		logger.info("serverAddresses:" + serverAddresses.toString());
 
		// 连接认证
		// MongoCredential mongoCredential = null;
		// if (properties.getUsername() != null) {
		// 	mongoCredential = MongoCredential.createScramSha1Credential(
		// 			properties.getUsername(), properties.getAuthenticationDatabase() != null
		// 					? properties.getAuthenticationDatabase() : properties.getDatabase(),
		// 			properties.getPassword().toCharArray());
		// }
 
		// 创建认证客户端
		// MongoClient mongoClient = new MongoClient(serverAddresses, mongoCredential, mongoClientOptions);
 
		// 创建非认证客户端
		MongoClient mongoClient = new MongoClient(serverAddresses, mongoClientOptions);
 
		// 创建MongoDbFactory
		MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(mongoClient, properties.getDatabase());
		return mongoDbFactory;
	}
}

MongoDB测试

创建数据实体

 
import java.io.Serializable;
 
public class UserEntity implements Serializable {
 
	private static final long serialVersionUID = 1L;
 
	private Long id;
	private String userName;
	private String passWord;
 
	public Long getId() {
		return id;
	}
 
	public void setId(Long id) {
		this.id = id;
	}
 
	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 toString() {
		return "id: " + id + ",userName: " + userName + ",passWord: " + passWord;
	}
}

创建Dao接口及实现

public interface UserDao {
 
	void saveUser(UserEntity user);
 
	UserEntity findUserByName(String userName);
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Component;
 
@Component
public class UserDaoImpl implements UserDao {
 
	@Autowired
	private MongoTemplate mongoTemplate;
 
	@Override
	public void saveUser(UserEntity user) {
		mongoTemplate.save(user);
	}
 
	@Override
	public UserEntity findUserByName(String userName) {
		Query query = new Query(Criteria.where("userName").is(userName));
		UserEntity user = mongoTemplate.findOne(query, UserEntity.class);
		return user;
	}
 
}

编写测试代码

 
import java.util.Optional;
 
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.Example;
import org.springframework.test.context.junit4.SpringRunner;
 
import com.pengjunlee.UserDao;
import com.pengjunlee.UserEntity;
import com.pengjunlee.UserRepository;
 
@RunWith(SpringRunner.class)
@SpringBootTest
public class MongoTest {
	@Autowired
	private UserDao userDao;
 
	@Autowired
	private UserRepository userRepository;
 
	@Test
	public void testSaveUser() {
		UserEntity user = new UserEntity();
		user.setId(88L);
		user.setUserName("XiaoMing");
		user.setPassWord("123456");
		userDao.saveUser(user);
	}
 
	@Test
	public void testFindUser01() {
		UserEntity user = userDao.findUserByName("XiaoMing");
		System.out.println(user);
	}
 
	@Test
	public void testFindUser02() {
		UserEntity queryUser = new UserEntity();
		queryUser.setUserName("XiaoMing");
		Example example = Example.of(queryUser);
		Optional optional = userRepository.findOne(example);
		System.out.println(optional.get());
	}
}

查询结果：

id: 88,userName: XiaoMing,passWord: 123456