SpringBoot-mongodb集群环境配置

spring:
  data:
    mongodb:
      host: 192.168.1.1:27017
      username: test_user
      password: pass@123
      database: tdb

这是spring-mongodb的配置，当mongodb使用了集群之后我尝试着直接修改

     host: 192.168.1.1:27017,192.168.1.2:27017,192.168.1.3:27017

启动是没问题，使用是直接报错了UnknowHost，显然这样是不行的

查看了spring autorconfig的源码

org.springframework.boot.autoconfigure.mongo.MongoProperties

	private MongoClient createEmbeddedMongoClient(MongoClientOptions options, int port) {
		if (options == null) {
			options = MongoClientOptions.builder().build();
		}
		String host = (this.host != null ? this.host : "localhost");
		return new MongoClient(Collections.singletonList(new ServerAddress(host, port)),
				Collections.emptyList(), options);
	}

	private MongoClient createNetworkMongoClient(MongoClientOptions options) {
		if (hasCustomAddress() || hasCustomCredentials()) {
			if (this.uri != null) {
				throw new IllegalStateException("Invalid mongo configuration, "
						+ "either uri or host/port/credentials must be specified");
			}
			if (options == null) {
				options = MongoClientOptions.builder().build();
			}
			List credentials = new ArrayList();
			if (hasCustomCredentials()) {
				String database = (this.authenticationDatabase != null
						? this.authenticationDatabase : getMongoClientDatabase());
				credentials.add(MongoCredential.createCredential(this.username, database,
						this.password));
			}
			String host = (this.host != null ? this.host : "localhost");
			int port = (this.port != null ? this.port : DEFAULT_PORT);
			return new MongoClient(
					Collections.singletonList(new ServerAddress(host, port)), credentials,
					options);
		}
		// The options and credentials are in the URI
		return new MongoClient(new MongoClientURI(determineUri(), builder(options)));
	}

显然这个配置提供了两种配置方式createEmbeddedMongoClient和createNetworkMongoClient

createEmbeddedMongoClient中创建MongoClient的时候使用的是Collections.singletonList这不可能是集群环境的配置所以看了一下createNetworkMongoClient的代码hasCustomAddress()和hasCustomCredentials()是是否有判断username、password、host、port配置，如果有这些配置并且uri不为空就会直接报错，也就是uri配置不能与其共存，host的配置方式又不能配置集群环境那么只能使用uri来实现集群配置了。

根据配置类上的文档注释尝试着修改配置为

spring:
  data:
    mongodb:
      uri: mongodb://test_user:pass%[email protected]:27017,192.168.1.2:27017,192.168.1.3:27017/tdb

注意：username和password中含有“:”或“@”需要进行URLEncoder编码