更改Maven工程默认的JDK版本

修改Maven中conf目录里的setting.xml文件内容，加上如下内容：

< profiles >

        < profile >
            < id >jdk-1.8 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 >
            properties >
            < repositories >
                < repository >
                    < id >nexus id >
                    < name >local private nexus name >
                    < url >http://maven.oschina.net/content/groups/public/ url >
                    < releases >
                        < enabled >true enabled >
                    releases >
                    < snapshots >
                        < enabled >false enabled >
                    snapshots >
                repository >
            repositories >
            < pluginRepositories >
                < pluginRepository >
                    < id >nexus id >
                    < name >local private nexus name >
                    < url >http://maven.oschina.net/content/groups/public/ url >
                    < releases >
                        < enabled >true enabled >
                    releases >
                    < snapshots >
                        < enabled >false enabled >
                    snapshots >
                pluginRepository >
            pluginRepositories >
        profile >



    profiles >

其中的1.8修改为你需要的jdk版本号，然后在eclipse里的项目右击鼠标-Maven-select Maven profiles，选择对应的jdk参数，然后更新项目就可以了