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原理：在本地或者项目的配置文件里 写了一些属性，把这些属性封装到编写的类里，什么地方需要就把该类注入即可
spring boot 1.5版本之前的写法
第一步 定义配置类
配置类要实现版本号要有get/set方法 可以用@Data实现省去set与get lokback功能
只需要一个@ConfigurationProperties注解即可
而且@ConfigurationProperties 里还可以加入位置属性，
locations = "classpath:/author/authorA.properties" 位置属性
这里是从配置中心获取的配置就省略该属性了
@ConfigurationProperties(ignoreUnknownFields = true, prefix = "manageMongo")
public class ManageMongoProperties implements Serializable{
private static final long serialVersionUID = 20180906164701L;
private String host ;
private Integer port = 27107;
private Integer connectionsPerHost = 27107;
private Integer maxWaitTime = 27107;
private Integer socketTimeout = 27107;
private Integer maxConnectionLifeTime = 27107;
private Integer connectTimeout = 27107;
public String getHost() {
return host;
}
public void setHost(String host) {
this.host = host;
}
public Integer getPort() {
return port;
}
public void setPort(Integer port) {
this.port = port;
}
public Integer getConnectionsPerHost() {
return connectionsPerHost;
}
public void setConnectionsPerHost(Integer connectionsPerHost) {
this.connectionsPerHost = connectionsPerHost;
}
public Integer getMaxWaitTime() {
return maxWaitTime;
}
public void setMaxWaitTime(Integer maxWaitTime) {
this.maxWaitTime = maxWaitTime;
}
public Integer getSocketTimeout() {
return socketTimeout;
}
public void setSocketTimeout(Integer socketTimeout) {
this.socketTimeout = socketTimeout;
}
public Integer getMaxConnectionLifeTime() {
return maxConnectionLifeTime;
}
public void setMaxConnectionLifeTime(Integer maxConnectionLifeTime) {
this.maxConnectionLifeTime = maxConnectionLifeTime;
}
public Integer getConnectTimeout() {
return connectTimeout;
}
public void setConnectTimeout(Integer connectTimeout) {
this.connectTimeout = connectTimeout;
}
}第二步 在monog数据源的配置类里使用该配置类
@Configuration
@EnableConfigurationProperties(ManageMongoProperties.class)//这个注解必须加 1.5版本之前的写
//法 有点开启配置类实例化的意思
public class ManageMongoConfig {
@Autowired
private ManageMongoProperties cfg ;//注入配置类
@Bean(name = "manageMongoClient")
public MongoClient manageMongoTemplate() throws Exception {
MongoClientOptions.Builder builder = new MongoClientOptions.Builder();
builder.connectionsPerHost(cfg.getConnectionsPerHost());//使用配置类
builder.maxWaitTime(cfg.getMaxWaitTime());
builder.maxConnectionLifeTime(cfg.getMaxConnectionLifeTime());
builder.connectTimeout(cfg.getConnectTimeout());
MongoClientOptions mongoClientOptions = builder.build();
List<ServerAddress> serverAddresses = new ArrayList<ServerAddress>();
ServerAddress serverAddress = new ServerAddress(cfg.getHost(), cfg.getPort());
serverAddresses.add(serverAddress);
MongoClient mongoClient = new MongoClient(serverAddress,mongoClientOptions);
return mongoClient;
}
}也可以在controller里注入该配置类
1.5版本以后的写法
配置类作为组建了，必须加入@Componnet注解，且@ConfigurationProperties取消location属性，想指定配置文件位置的话
那就使用@PropertySource ，monog数据源的配置类里使用该配置类，取消@EnableConfigurationProperties注解，直接注入即可
