maven打包，lib路径下jar包引入问题，及IDEA运行时lib引入问题

示例：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>med.szreach</groupId>
  <artifactId>oa.hb</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>


  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.1</version>
      <scope>provided</scope>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
          <webResources>
            <resource>
              <directory>${project.basedir}/lib</directory>
              <targetPath>WEB-INF/lib/</targetPath>
              <includes>
                <include>**/*.jar</include>
              </includes>
            </resource>
          </webResources>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
          <!--根据你把lib放的位置-->
          <compilerArguments>
            <extdirs>${project.basedir}/lib</extdirs>
          </compilerArguments>
        </configuration>
      </plugin>
    </plugins>
  </build>

</project>