mvn install:install-file -Dfile=c:whereYoureFileIs-{version}.jar -DgroupId=com.companyName.projectName
-DartifactId=projectName -Dversion={Your version} -Dpackaging=jar

<dependency>
        <groupId>groupId of project2</groupId>
        <artifactId>artifactId of project2</artifactId>
        <version>version  of project2</version>
    </dependency>

<dependency>
   <groupId>com.p1</groupId>
   <artifactId>p1</artifactId>
   <version>1.0-SNAPSHOT</version>
   <scope>compile</scope>
 </dependency>