feat: 添加配置，启动时将 dataSource.yml 加入 Environment

Author: cadecode

simple-common/src/main/java/top/cadecode/common/datasource/DataSourceEnvironment.java

@@ -0,0 +1,40 @@
+package top.cadecode.common.datasource;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.boot.env.YamlPropertySourceLoader;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+
+import java.io.IOException;
+
+/**
+ * @author Li Jun
+ * @date 2021/12/3
+ * @description 将数据源配置文件加入到 Environment
+ */
+public class DataSourceEnvironment implements EnvironmentPostProcessor {
+
+    private final YamlPropertySourceLoader loader = new YamlPropertySourceLoader();
+
+    @Override
+    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+        Resource path = new ClassPathResource("dataSource.yml");
+        PropertySource<?> propertySource = loadDataSourceYaml(path);
+        environment.getPropertySources().addLast(propertySource);
+    }
+
+    // 加载 dataSource.yml
+    private PropertySource<?> loadDataSourceYaml(Resource path) {
+        if (!path.exists()) {
+            throw new IllegalArgumentException("数据源配置文件 " + path + " 不存在");
+        }
+        try {
+            return this.loader.load("dataSource.yml", path).get(0);
+        } catch (IOException ex) {
+            throw new IllegalStateException("加载 dataSource.yml 时出错，路径是 " + path, ex);
+        }
+    }
+}

simple-web/src/main/resources/META-INF/spring.factories

@@ -0,0 +1,2 @@
+# 将数据源配置文件加入 Environment
+org.springframework.boot.env.EnvironmentPostProcessor=top.cadecode.common.datasource.DataSourceEnvironment

simple-web/src/main/resources/dataSource.yml

@@ -0,0 +1,20 @@
+# 配置数据源
+dataSource:
+  db1:
+    # 指定 dataSource 种类
+    type: com.zaxxer.hikari.HikariDataSource
+    # 指定连接配置
+    config:
+      jdbc-url: jdbc:mysql://localhost:3306/demo?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
+      driver-class-name: com.mysql.cj.jdbc.Driver
+      username: root
+      password: xxxx
+  db2:
+    type: com.zaxxer.hikari.HikariDataSource
+    config:
+      jdbc-url: jdbc:mysql://localhost:3306/demo_cluster?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
+      driver-class-name: com.mysql.cj.jdbc.Driver
+      username: root
+      password: xxxx
+# 默认数据源
+default: db2