refactor(project):convert java project to Maven project

Author: yansheng836

.classpath

@@ -23,3 +23,24 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+/target/
+
+# Maven files
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+# Eclipse project files
+.settings
+.project
+.classpath
+.mymetadata
+
+release