更新zheng-demo的编译版本

zheng-demo/pom.xml

@@ -10,6 +10,13 @@
     <name>zheng-demo Maven Webapp</name>
     <url>http://www.zhangshuzheng.cn</url>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>1.7</maven.compiler.source>
+        <maven.compiler.target>1.7</maven.compiler.target>
+        <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
+    </properties>
+
     <dependencies>
         <dependency>
             <groupId>com.zheng</groupId>