Maven:修改JDK版本

<properties>
    <jdk>1.7</jdk>
</properties>
<build>
	<finalName>jfork</finalName>
	<defaultGoal>compile</defaultGoal>
	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>3.3</version>
			<configuration>
				<encoding>UTF-8</encoding>
				<source>${jdk}</source>
				<target>${jdk}</target>
			</configuration>
		</plugin>		
	</plugins>
</build>