修改jdk编译版本为1.8

pom.xml

@@ -73,8 +73,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.5.1</version>
                 <configuration>
-                    <source>1.7</source>
-                    <target>1.7</target>
+                    <source>1.8</source>
+                    <target>1.8</target>
                     <encoding>UTF-8</encoding>
                     <compilerArgs>
                         <arg>-Xlint:unchecked</arg>