maven配置，jdk1.8

<!-- 局部jdk配置，pom.xml中 -->
    <build>  
        <plugins>  
            <plugin>  
                <groupId>org.apache.maven.plugins</groupId>  
                <artifactId>maven-compiler-plugin</artifactId>  
                <configuration>  
                    <source>1.8</source>  
                    <target>1.8</target>  
                </configuration>  
            </plugin>  
        </plugins>  
    </build>  

<!-- 全局jdk配置，settings.xml -->
    <profile>  
        <id>jdk18</id>  
        <activation>  
            <activeByDefault>true</activeByDefault>  
            <jdk>1.8</jdk>  
        </activation>  
        <properties>  
            <maven.compiler.source>1.8</maven.compiler.source>  
            <maven.compiler.target>1.8</maven.compiler.target>  
            <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>  
        </properties>   
    </profile> 

maven配置，jdk1.8