[Add] PropertiesUtils 增加一个工具类;

src/main/java/net/lamgc/cgj/util/PropertiesUtils.java

@@ -0,0 +1,51 @@
+package net.lamgc.cgj.util;
+
+import net.lamgc.utils.base.ArgumentsProperties;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public final class PropertiesUtils {
+
+    private final static Logger log = LoggerFactory.getLogger(PropertiesUtils.class);
+
+    private PropertiesUtils() {}
+
+    /**
+     * 从ArgumentsProperties获取设置项到System Properties
+     * @param prop ArgumentsProperties对象
+     * @param key 设置项key
+     * @param defaultValue 默认值
+     * @return 如果成功从ArgumentsProperties获得设置项, 返回true, 如未找到(使用了defaultValue或null), 返回false;
+     */
+    public static boolean getSettingToSysProp(ArgumentsProperties prop, String key, String defaultValue) {
+        if(prop.containsKey(key)) {
+            log.info("{}: {}", key, prop.getValue(key));
+            System.setProperty("cgj." + key, prop.getValue(key));
+            return true;
+        } else {
+            if(defaultValue != null) {
+                System.setProperty("cgj." + key, defaultValue);
+            }
+            return false;
+        }
+    }
+
+    /**
+     * 将环境变量的值读取并存入System Properties.
+     * @param envKey 待获取的环境变量Key
+     * @param sysPropKey 要设置的System Properties Key值
+     * @param defaultValue 默认值, 可选
+     * @return 如果设置成功, 返回true, 否则返回false
+     */
+    public static boolean getEnvSettingToSysProp(String envKey, String sysPropKey, String defaultValue) {
+        String env = System.getenv(envKey);
+        if(env != null) {
+            System.setProperty("cgj." + sysPropKey, env);
+            return true;
+        } else if(defaultValue != null) {
+            System.setProperty("cgj." + sysPropKey, defaultValue);
+        }
+        return false;
+    }
+
+}