maven 中 指定jdk 和 编译编码，仓库位置

<!-- 配置编译选项 -->
     <profile>
            <id>jdk1.8</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>
                <encoding>UTF-8</encoding>
            </properties>   

            <repositories>
                <repository>
                  <id>local-server</id>
                  <name>local repository</name>
                  <url>http://st39:8081/nexus/content/groups/public/</url>
                  <layout>default</layout>
                  <snapshotPolicy>always</snapshotPolicy>
                  <releases>
                    <enabled>true</enabled>
                  </releases>
                  <snapshots>
                    <enabled>true</enabled>
                  </snapshots>
                </repository>

                <repository>
                  <id>wso2</id>
                  <name>local repository</name>
                  <url>http://dist.wso2.org/maven2/</url>
                  <layout>default</layout>
                  <snapshotPolicy>always</snapshotPolicy>
                  <releases>
                    <enabled>true</enabled>
                  </releases>
                  <snapshots>
                    <enabled>true</enabled>
                  </snapshots>
                </repository>

                <repository>
                  <id>central</id>
                  <name>central</name>
                  <url>http://central.maven.org/maven2/</url>
                  <layout>default</layout>
                  <snapshotPolicy>always</snapshotPolicy>
                  <releases>
                    <enabled>true</enabled>
                  </releases>
                  <snapshots>
                    <enabled>true</enabled>
                  </snapshots>
                </repository>

            </repositories>
     </profile>