新建maven项目改servlet3.0配置

新建maven的web项目时，默认都是servlet2.3。想改成3.0，见以下步骤：
1.POM文件修改：

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.along.studio</groupId>
  <artifactId>test-hibernate</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>test-hibernate Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <properties>
		<java-api.version>1.8</java-api.version>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<spring.version>4.1.1.RELEASE</spring.version>
		<hibernate.version>5.1.0.Final</hibernate.version>
		<mysql.connector.version>5.1.16</mysql.connector.version>
	</properties>
  <dependencies>
  <dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>1.16.6</version>
		</dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>hibernate</finalName>
    <plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.5.1</version>
				<configuration>
					<compilerVersion>${java-api.version}</compilerVersion>
					<source>${java-api.version}</source>
					<target>${java-api.version}</target>
					<encoding>${project.build.sourceEncoding}</encoding>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-source-plugin</artifactId>
				<version>2.4</version>
				<configuration>
					<attach>true</attach>
				</configuration>
				<executions>
					<execution>
						<phase>compile</phase>
						<goals>
							<goal>jar</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
  </build>
</project>

2.web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="hibernate" version="3.0">
  <display-name>Archetype Created Web Application</display-name>
</web-app>

3.项目下settings文件夹中的org.eclipse.wst.common.project.facet.core.xml打开

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
  <fixed facet="wst.jsdt.web"/>
  <installed facet="java" version="1.8"/>
  <installed facet="jst.web" version="3.0"/>
  <installed facet="wst.jsdt.web" version="1.0"/>
</faceted-project>

4.java build path：
add library——Server runtime—— tomcat

以上修改完之后，maven-update project， 再install一下，就ok了