fix compiling issues

evcs-modules/evcs-common/pom.xml

@@ -90,4 +90,8 @@
             <scope>compile</scope>
         </dependency>
     </dependencies>
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
 </project>

evcs-modules/evcs-core/src/main/java/com/xhpc/evcs/utils/DateUtil.java

@@ -171,11 +171,11 @@ public class DateUtil {
         return getChineseDate(str.substring(0, 1))
                 + getChineseDate(str.substring(1, 2))
                 + getChineseDate(str.substring(2, 3))
-                + getChineseDate(str.substring(3, 4)) + '年'
+                + getChineseDate(str.substring(3, 4)) + "年"
                 + getChineseDate(str.substring(yearBorder + 1, monthBorder))
-                + '月'
+                + "月"
                 + getChineseDate(str.substring(monthBorder + 1, dayBorder))
-                + '日';
+                + "日";
     }
 
     /**

evcs-modules/pom.xml

@@ -11,6 +11,7 @@
     <groupId>com.xhpc</groupId>
     <artifactId>evcs-modules</artifactId>
     <packaging>pom</packaging>
+    <version>1.0</version>
 
     <modules>
         <module>evcs-core</module>