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
@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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持亿速云。
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