Maven – Web 应用
本教程将指导你如何使用 Maven 版本控制系统来管理一个基于 Web 的工程。在此，你将学习到如何创建/构建/部署以及运行 Web 应用程序：
创建 Web 应用
建立一个简单的 Java web 应用，我们可以使用 maven-archetype-webapp 插件。首先我们打开命令控制台，进入 C:\MVN 目录并且执行以下的 mvn 命令。
C:\MVN>mvn archetype:generate
-DgroupId=com.companyname.automobile
-DartifactId=trucks
-DarchetypeArtifactId=maven-archetype-webapp
-DinteractiveMode=false
Maven 将开始处理并且将创建完整的基于 Web 的 java 应用工程结构。
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'archetype'.
[INFO] -------------------------------------------------------------------
[INFO] Building Maven Default Project
[INFO] task-segment: [archetype:generate] (aggregator-style)
[INFO] -------------------------------------------------------------------
[INFO] Preparing archetype:generate
[INFO] No goals needed for project - skipping
[INFO] [archetype:generate {execution: default-cli}]
[INFO] Generating project in Batch mode
[INFO] --------------------------------------------------------------------
[INFO] Using following parameters for creating project
from Old (1.x) Archetype: maven-archetype-webapp:1.0
[INFO] --------------------------------------------------------------------
[INFO] Parameter: groupId, Value: com.companyname.automobile
[INFO] Parameter: packageName, Value: com.companyname.automobile
[INFO] Parameter: package, Value: com.companyname.automobile
[INFO] Parameter: artifactId, Value: trucks
[INFO] Parameter: basedir, Value: C:\MVN
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: C:\MVN\trucks
[INFO] -------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] -------------------------------------------------------------------
[INFO] Total time: 16 seconds
[INFO] Finished at: Tue Jul 17 11:00:00 IST 2012
[INFO] Final Memory: 20M/89M
[INFO] -------------------------------------------------------------------
现在进入 C:/MVN 目录，你将看到一个名为 trucks（由 artifactld 指定）的 java 应用工程。
Maven 使用一个标准的目录架构，如上示例，我们可以理解以下的关键概念：
| 文件夹结构 | 描述 |
|---|---|
| trucks | 包含 src 文件夹和 pom.xml |
| src/main/webapp | 包含 index.jsp 和 WEB-INF 文件夹. |
| src/main/webapp/WEB-INF | 包含 web.xml |
| src/main/resources | 包含 images / properties 文件。 |
POM.xml
<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.companyname.automobile</groupId>
<artifactId>trucks</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>trucks Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>trucks</finalName>
</build>
</project>
如果仔细观察，Maven 还创建了一个示例 JSP 的源文件。
打开 C:\ > MVN > trucks > src > main > webapp > 文件夹, 你将看到 index.jsp.
<html>
<body>
<h2>Hello World!</h2>
</body>
</html>
Build Web Application
打开终端，进入 C:\MVN\trucks 目录，然后执行如下 mvn 命令.
C:\MVN\trucks>mvn clean package
Maven 将会开始构建此工程，日志输出如下：
[INFO] Scanning for projects...
[INFO] -------------------------------------------------------------------
[INFO] Building trucks Maven Webapp
[INFO] task-segment: [clean, package]
[INFO] -------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] [resources:resources {execution: default-resources}]
[WARNING] Using platform encoding (Cp1252 actually) to
copy filtered resources,i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO] [compiler:compile {execution: default-compile}]
[INFO] No sources to compile
[INFO] [resources:testResources {execution: default-testResources}]
[WARNING] Using platform encoding (Cp1252 actually) to
copy filtered resources,i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory
C:\MVN\trucks\src\test\resources
[INFO] [compiler:testCompile {execution: default-testCompile}]
[INFO] No sources to compile
[INFO] [surefire:test {execution: default-test}]
[INFO] No tests to run.
[INFO] [war:war {execution: default-war}]
[INFO] Packaging webapp
[INFO] Assembling webapp[trucks] in [C:\MVN\trucks\target\trucks]
[INFO] Processing war project
[INFO] Copying webapp resources[C:\MVN\trucks\src\main\webapp]
[INFO] Webapp assembled in[77 msecs]
[INFO] Building war: C:\MVN\trucks\target\trucks.war
[INFO] -------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] -------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Tue Jul 17 11:22:45 IST 2012
[INFO] Final Memory: 11M/85M
[INFO] -------------------------------------------------------------------
部署 Web 应用
现在拷贝在 C:\ > MVN > trucks > target > 文件夹下的 trucks.war 到你的 web 服务器的 webapp 目录下，并且重启 web 服务。
测试 Web 应用
使用URL: http://\ :\ /trucks/index.jsp 来运行你的 Web 应用。
验证输出结果：
