Maven (v)----Dependencies & Add Plugins

1. Scope of dependence 1.1 Compile (default)

compilation (Compile) required, required for testing, runtime required, package required
1.2 provided

Required when compiling (compile), when testing (test) is required, not required at run time, not required when packaging

Usage Scenario:: Jsp-api.jar Servlet-api.jar. If these two jar packages are set to compile, then the two jar packages will be included in the project after the war package. And, our war package will be thrown into Tomcat to run, and Tomcat inside the original two jar package, will cause the jar package conflict.
1.3 Runtime

Not required at compile time, required for testing, runtime required, package required

Usage Scenario: Database driver Package
1.4 Test

Not required at compile time, required for testing, not required at run time, no packaging required

Usage Scenario: Junit.jar
2, add plug-ins

pom.xml-Right-click-maven-add Plugin

Maven runs with TOMCAT6 by default and how to switch to TOMCAT7.

pom.xml-Right-click-maven-add Plugin

Project Right-click-run as-maven Build ...

To use the command Tomcat7:run

<build>
	<!--is configured with a number of plugins--
	<plugins>
		<plugin>
			<groupId> org.apache.maven.plugins</groupid>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>3.5.1</version>
			<configuration>
				<source>1.7</source>
				< target>1.7</target>
				<encoding>UTF-8</encoding>
			</configuration>
		</ plugin>
	</plugins>
</build>

The build contains a plugin