因為今天開發遇到了性能問題，可能與MongoDB的連接有關，所以稍稍深入看了一下，正好搜到原來有人寫過這篇相關的內容，所以轉載過來。回頭有時間可以寫個擴展到SpringForAll里，主體思路還是一樣的。感謝這位美女程序媛的文章！

說明

Spring Boot中通過依賴spring-boot-starter-data-mongodb，來實現spring-data-mongodb的自動配置。
但是默認情況下，Spring Boot 中，并沒有像使用MySQL或者Redis一樣，提供了連接池配置的功能。因此，我們需要自行重寫 MongoDbFactory，實現MongoDB客戶端連接的參數配置擴展。

需要說明的是，MongoDB的客戶端本身就是一個連接池，因此，我們只需要配置客戶端即可。

配置文件

為了統一Spring Boot的配置，我們要將重寫的配置也配置到 application.yml中，前綴為spring.data.mongodb.custom下（前綴可自己隨意配置）：

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

該配置例子中，配置了副本集，其中包含了主機10.0.5.1:27017和10.0.5.1:27018，其它配置與Spring Boot的標準配置類似，另外，connections-per-host為客戶端的連接數，in-connections-per-host為客戶端最小連接數。

將配置包裝成類

為方便調用和可讀性，將上述配置包裝成一個配置實體類，MongoConfig.java代碼如下:

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; } }

覆蓋MongoDbFactory

接下來，就是覆蓋Spring Boot原有的MongoDbFactory Bean，新建文件MongoConfig.java，代碼如下：

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 { // 注入配置實體 @Autowired private MongoSettingsProperties mongoSettingsProperties; @Bean @ConfigurationProperties( prefix = "spring.data.mongodb.custom") MongoSettingsProperties mongoSettingsProperties() { return new MongoSettingsProperties(); } // 覆蓋默認的MongoDbFactory @Bean MongoDbFactory mongoDbFactory() { //客戶端配置（連接數、副本集群驗證） 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()); // 連接認證 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()); //創建客戶端和Factory MongoClient mongoClient = new MongoClient(serverAddresses, mongoCredentialList, mongoClientOptions); MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(mongoClient, mongoSettingsProperties.getDatabase()); return mongoDbFactory; } }

在這里，實現了MongoDB連接時，前面配置的參數的設置，按照自己的實際情況，可以在new SimpleMongoDbFactory時，增加修改自己需要的配置參數。

至此，就完成了全部配置，運行測試即可。

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