Springboot 2.x 多个 mongodb 数据源 MongoTemplate

home 编辑时间 2019/08/23

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## 简介
多数据源有很多好处，根据重要性区别备份，也可以区别分配资源等
网上查了很多例子都是针对`Repository`用法的mongodb多数据源
奈何我就喜欢用MongoTemplate
参考了以下这篇博客，自己实现了一下mongodb 多数据源 搭配多个MongoTemplate

参考：[https://blog.csdn.net/u011663149/article/details/88634598](https://blog.csdn.net/u011663149/article/details/88634598)

## 代码

### 配置源
**application.yml**
```yml
test1:
    mongodb:
        host:localhost
        port:27001
        database:test1
 
test2:
    mongodb:
        host:localhost
        port:27001
        database:test2
```

### springboot配置类
**AbstractMongoConfig.java**
```java
package com.zzzmh.api.config;

import com.mongodb.MongoClient;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.SimpleMongoDbFactory;

public abstract class AbstractMongoConfig {
    private String host;
    private String database;
    private int port;

public String getHost() {
        return host;
    }

public void setHost(String host) {
        this.host = host;
    }

public String getDatabase() {
        return database;
    }

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

public int getPort() {
        return port;
    }

public void setPort(int port) {
        this.port = port;
    }

public MongoDbFactory mongoDbFactory() throws Exception {
        return new SimpleMongoDbFactory(new MongoClient(host, port), database);
    }

abstract public MongoTemplate getMongoTemplate() throws Exception;
}
```

**Test1MongoConfig.java**
```java
@Configuration
@ConfigurationProperties(prefix = "test1.mongodb")
public class Test1MongoConfig extends AbstractMongoConfig {

/**
     * @Primary 设为默认
     * MongoTemplate实现
     */
    @Primary
    @Override
    public @Bean(name = "test1MongoTemplate")
    MongoTemplate getMongoTemplate() throws Exception {
        return new MongoTemplate(mongoDbFactory());
    }
}
```

**Test2MongoConfig.java**
```java
@Configuration
@ConfigurationProperties(prefix = "test2.mongodb")
public class Test2MongoConfig extends AbstractMongoConfig {

/**
     * MongoTemplate实现
     */
    @Override
    public @Bean(name = "test2MongoTemplate")
    MongoTemplate getMongoTemplate() throws Exception {
        return new MongoTemplate(mongoDbFactory());
    }
}
```

### 用法
使用Qualifier配置MongoTemplate用哪个数据源
不配置则使用默认数据源
```java
@Autowired
@Qualifier(value = "test1MongoTemplate")
private MongoTemplate mongoTemplate;
```

## END

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