Spring Boot中使用MongoDB的连接池配置

说明

Spring Boot中通过依赖

spring-boot-starter-data-mongodb

，来实现

spring-data-mongodb

的自动配置。

但是默认情况下，Spring Boot 中，并没有像使用MySQL或者Redis一样，提供了连接池配置的功能。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。

配置文件

为了统一Spring Boot的配置，我们要将重写的配置也配置到

application.yml

中，前缀为

spring.data.mongodb.custom

下（前缀可自己随意配置）：

spring:
data:
mongodb:
custom:
hosts:
- 10.0.5.1
- 10.0.5.1
ports:
- 27017
- 27018
replica-set: mgset-3590061
username: jancee
password: abc123
database: jancee
authentication-database: admin
connections-per-host: 20
min-connections-per-host: 20

该配置例子中，配置了副本集，其中包含了主机

10.0.5.1:27017

和

10.0.5.1:27018

，其它配置与Spring Boot的标准配置类似，另外，

connections-per-host

为客户端的连接数，

in-connections-per-host

为客户端最小连接数。

将配置包装成类

为方便调用和可读性，将上述配置包装成一个配置实体类，

MongoConfig.java

代码如下:

package com.feidiao.jancee.fdiot.api.config.mongo;

import org.hibernate.validator.constraints.NotBlank;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.stereotype.Component;
import org.springframework.validation.annotation.Validated;

import java.util.List;

@Component
@Validated
public class MongoSettingsProperties {

@NotBlank
private String database;

@NotEmpty
private List<String> hosts;

@NotEmpty
private List<Integer> ports;

private String replicaSet;
private String username;
private String password;
private String authenticationDatabase;
private Integer minConnectionsPerHost = 10;
private Integer connectionsPerHost = 2;

public MongoSettingsProperties() {

}

public String getDatabase() {
return database;
}

public void setDatabase(String database) {
this.database = database;
}

public List<String> getHosts() {
return hosts;
}

public void setHosts(List<String> hosts) {
this.hosts = hosts;
}

public List<Integer> getPorts() {
return ports;
}

public void setPorts(List<Integer> ports) {
this.ports = ports;
}

public String getReplicaSet() {
return replicaSet;
}

public void setReplicaSet(String replicaSet) {
this.replicaSet = replicaSet;
}

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 getAuthenticationDatabase() {
return authenticationDatabase;
}

public void setAuthenticationDatabase(String authenticationDatabase) {
this.authenticationDatabase = authenticationDatabase;
}

public Integer getMinConnectionsPerHost() {
return minConnectionsPerHost;
}

public void setMinConnectionsPerHost(Integer minConnectionsPerHost) {
this.minConnectionsPerHost = minConnectionsPerHost;
}

public Integer getConnectionsPerHost() {
return connectionsPerHost;
}

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

覆盖MongoDbFactory

接下来，就是覆盖Spring Boot原有的

MongoDbFactory

Bean，新建文件

MongoConfig.java

，代码如下：

import com.mongodb.MongoClient;
import com.mongodb.MongoClientOptions;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 java.util.ArrayList;
import java.util.List;

@Configuration
public class MongoConfig {

// 注入配置实体
@Autowired
private MongoSettingsProperties mongoSettingsProperties;
@Bean
@ConfigurationProperties(
prefix = "spring.data.mongodb.custom")
MongoSettingsProperties mongoSettingsProperties() {
return new MongoSettingsProperties();
}

// 覆盖默认的MongoDbFactory
@Bean
MongoDbFactory mongoDbFactory() {
//客户端配置（连接数、副本集群验证）
MongoClientOptions.Builder builder = new MongoClientOptions.Builder();
builder.connectionsPerHost(mongoSettingsProperties.getConnectionsPerHost());
builder.minConnectionsPerHost(mongoSettingsProperties.getMinConnectionsPerHost());
if (mongoSettingsProperties.getReplicaSet() != null) {
builder.requiredReplicaSetName(mongoSettingsProperties.getReplicaSet());
}
MongoClientOptions mongoClientOptions = builder.build();

// MongoDB地址列表
List<ServerAddress> serverAddresses = new ArrayList<>();
for (String host : mongoSettingsProperties.getHosts()) {
Integer index = mongoSettingsProperties.getHosts().indexOf(host);
Integer port = mongoSettingsProperties.getPorts().get(index);

ServerAddress serverAddress = new ServerAddress(host, port);
serverAddresses.add(serverAddress);
}
System.out.println("serverAddresses:" + serverAddresses.toString());

// 连接认证
List<MongoCredential> mongoCredentialList = new ArrayList<>();
if (mongoSettingsProperties.getUsername() != null) {
mongoCredentialList.add(MongoCredential.createScramSha1Credential(
mongoSettingsProperties.getUsername(),
mongoSettingsProperties.getAuthenticationDatabase() != null ? mongoSettingsProperties.getAuthenticationDatabase() : mongoSettingsProperties.getDatabase(),
mongoSettingsProperties.getPassword().toCharArray()));
}
System.out.println("mongoCredentialList:" + mongoCredentialList.toString());

//创建客户端和Factory
MongoClient mongoClient = new MongoClient(serverAddresses, mongoCredentialList, mongoClientOptions);
MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(mongoClient, mongoSettingsProperties.getDatabase());

return mongoDbFactory;
}
}

在这里，实现了MongoDB连接时，前面配置的参数的设置，按照自己的实际情况，可以在

new SimpleMongoDbFactory

时，增加修改自己需要的配置参数。

至此，就完成了全部配置，运行测试即可。

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