Eclipse开发环境创建Servlet3.0 Maven WebApp 项目

在eclipse中创建 Maven WebApp项目； 初步文件结构已经建好，但是可以看到项目名称左侧有错误显示

index.jsp 文件有一个error ; Error的原因是在pom.xml文件中还没有配置web项目的依赖，打开pom.xml文件，添加JavaWeb 需要的Servlet、JSP、JSTL等依赖;

由于每个人本地的JDK版本可能不同，因此在pom.xml中来配置jdk的版本，以后就不用在去手动更改jdk的版本了

在pom.xml中添加如下代码：

<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>dayuanapp</groupId>
<artifactId>secondweb</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>secondweb Maven Webapp</name>
<url>http://maven.apache.org</url>
<!--定义一个全局变量，统一管理版本号  -->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.version>4.3.9.RELEASE</spring.version>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>

<!-- spring相关的依赖的jar包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.33</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.8.1</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- 数据库相关 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.31</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.4</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>

<!-- JSP -->
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
<scope>provided</scope>
</dependency>

<!-- JSTL -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<finalName>secondweb</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

2. 默认建立的webapp版本为2.3, 在eclipse中默认无法修改，因此打开项目的根目录下，

./settings/org.eclipse.wst.common.project.facet.core.xml文件，修改<installed facet="jst.web" version="3.0"/>

3.删除web.xml文件，右键点击项目，Java EE Tools>Generate Deployment Descriptor Stub

右键项目名称，Maven>Update Project...

Maven更改本地仓库、默认中央仓库的配置

在maven的安装目录下的conf/settings.xml 文件中进行设置即可，配置代码如下：

<!-- localRepository
| The path to the local repository maven will use to store artifacts.
|
| Default: ${user.home}/.m2/repository
<localRepository>/path/to/local/repo</localRepository>
-->
<localRepository>D:\Program Files (x86)\maven_repository</localRepository>//指定了本地仓库的位置

<mirrors>
<!-- 这里是配置了阿里云的仓库，下载速度非常快  -->
<mirror>
<!--This sends everything else to /public -->
<id>nexus</id>
<mirrorOf>*</mirrorOf>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</mirror>
<mirror>
<!--This is used to direct the public snapshots repo in the
profile below over to a different nexus group -->
<id>nexus-public-snapshots</id>
<mirrorOf>public-snapshots</mirrorOf>
<url>http://maven.aliyun.com/nexus/content/repositories/snapshots/</url>
</mirror>
</mirrors>