modi conf file to use sys evn vars

src/main/java/com/bbdtek/test/controller/TestController.java

@@ -34,7 +34,9 @@ public class TestController {
 
     @RequestMapping("hi")
     public String hi() {
-        return "HI!";
+        return "host=" + System.getenv("MYSQL_SERVICE_HOST") + "; "
+                + "username=" + System.getenv("MYSQL_USERNAME") + "; "
+                + "password=" + System.getenv("MYSQL_PASSWORD") + "; ";
     }
 
     @RequestMapping("createTable")

src/main/resources/jdbc/jdbc.properties

 jdbc.driver=com.mysql.jdbc.Driver
-jdbc.url=jdbc:mysql://mysql/mysql_database?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull
-jdbc.username=mysql_username
-jdbc.password=mysql_password
+jdbc.url=jdbc:mysql://#{systemEnvironment['MYSQL_SERVICE_HOST']}/mysql_database?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull
+jdbc.username=#{systemEnvironment['MYSQL_USERNAME']}
+jdbc.password=#{systemEnvironment['MYSQL_PASSWORD']}
 #\u521d\u59cb\u5316\u8fde\u63a5
 jdbc.initialSize=10
 #\u6700\u5927\u8fde\u63a5\u6570\u91cf\uff0c\u8bbe\u7f6e\u4e3a0\u65f6\uff0c\u8868\u793a\u6ca1\u6709\u9650\u5236