小兔网

本章节我们将学习如何使用版本控制系统 Maven 来管理一个基于 web 的项目,如何创建、构建、部署已经运行一个 web 应用。

创建 Web 应用

我们可以使用 maven-archetype-webapp 插件来创建一个简单的 Java web 应用。

打开命令控制台,进入到 C:\MVN 文件夹,然后执行以下的 mvn 命令:

C:\MVN>mvn archetype:generate -DgroupId=com.companyname.automobile -DartifactId=trucks -DarchetypeArtifactId=maven-archetype-webapp  -DinteractiveMode=false

执行完后 Maven 将开始处理,并且创建完整的于Java Web 项目的目录结构。

[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] -------------------------------------------------------------------

执行完后,我们可以在 C:/MVN 文件夹下看到 trucks 项目,查看项目的目录结构:

Maven Web 应用

Maven 目录结构是标准的,各个目录作用如下表所示:

文件夹结构描述
trucks包含 src 文件夹和 pom.xml 文件。
src/main/webapp包含 index.jsp 文件和 WEB-INF 文件夹.
src/main/webapp/WEB-INF包含 web.xml 文件
src/main/resources包含图片、properties资源文件。

pom.xml 文件代码如下:

<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>

接下来我们打开 C:\ > MVN > trucks > src > main > webapp > 文件夹,可以看到一个已经创建好的 index.jsp 文件,代码如下:

<html> <body> <h2>Hello World!</h2> </body></html>

构建 Web 应用

打开命令控制台,进入 C:\MVN\trucks 目录,然后执行下面的以下 mvn 命令:

C:\MVN\trucks>mvn clean package

Maven 将开始构建项目:

[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

打开 C:\ < MVN < trucks < target < 文件夹,找到 trucks.war 文件,并复制到你的 web 服务器的 web 应用目录,然后重启 web 服务器。

测试 Web 应用

访问以下 URL 运行 web 应用:

http://:/trucks/index.jsp

验证结果:

Maven Web 应用