Spring Boot中使用MongoDB的连接池配置的方法

因为今天开发遇到了性能问题，可能与MongoDB的连接有关，所以稍稍深入看了一下，正好搜到原来有人写过这篇相关的内容，所以转载过来。回头有时间可以写个扩展到SpringForAll里，主体思路还是一样的。感谢这位美女程序媛的文章！

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@Validatedpublic 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;@Configurationpublic 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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