# 仿SpringBoot属性文件加载

> 一般Java应用程序中,用于加载属性文件


maven
```
<dependency>
    <groupId>me.yuxiaoyao.lang</groupId>
    <artifactId>configuration-loader</artifactId>
    <version>1.0.0</version>
</dependency>
```

[最新版本见:pom.xml](./pom.xml)

## 依赖

### 1.必须的依赖
```xml
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>${jackson.version}</version>
</dependency>
```
### 2. 可先依赖(至少有一个,或者两个都加)
```xml
<!-- yml/yaml -->
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
    <version>${jackson.version}</version>
</dependency>

<!-- properties -->
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-properties</artifactId>
    <version>${jackson.version}</version>
</dependency>
```
如果两个依赖都加的话,文件后缀顺序为:

1. yml - jackson-dataformat-yaml
2. yaml - jackson-dataformat-yaml
3. properties - jackson-dataformat-properties

## 用法
ConnectorProperties.java
```java
@Data
public class ConnectorProperties {

    private Connector connector;
    private Transfer transfer;
    private Redis redis;

    @Data
    public static class Connector {
        private Integer port;
    }

    @Data
    public static class Transfer {
        private List<String> urls;
    }

    @Data
    public static class Redis {
        private String host;
        private Integer port;
        private String password;
        private int database;
    }

}
```
application.yml
```yaml
profile:
  active: dev
```

application-dev.yml
```yaml
connector:
  port: 9081
transfer:
  # all transfer services url
  urls: [127.0.0.1:9082]
redis:
  host: ${connector.port}
  port: 6379
  password:
  dababase: 0
```

默认的配置文件为`application.yml/application.yaml/application.properties`

```java
ConnectorProperties connectorProperties = ConfigLoader.parseConfig(ConnectorProperties.class);
```