Maven Web 應用

本章節我們將學習如何使用版本控制系統 Maven 來管理一個基於 web 的專案，如何創建、構建、部署已經運行一個 web 應用。

創建 Web 應用

我們可以使用 maven-archetype-webapp 插件來創建一個簡單的 Java web 應用。

打開命令控制臺，進入到 C:\MVN 檔夾，然後執行以下的 mvn 命令：

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

執行完後 Maven 將開始處理，並且創建完整的於Java Web 專案的目錄結構。

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

執行完後，我們可以在 C:/MVN 檔夾下看到 trucks 專案，查看專案的目錄結構：

Maven 目錄結構是標準的，各個目錄作用如下表所示:

檔夾結構 描述
trucks 包含 src 檔夾和 pom.xml 檔。
src/main/webapp 包含 index.jsp 檔和 WEB-INF 檔夾.
src/main/webapp/WEB-INF 包含 web.xml 檔
src/main/resources 包含圖片、properties資源檔。

pom.xml 檔代碼如下：

<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>

接下來我們打開 C:\ > MVN > trucks > src > main > webapp > 檔夾，可以看到一個已經創建好的 index.jsp 檔，代碼如下：

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

構建 Web 應用

打開命令控制臺，進入 C:\MVN\trucks 目錄，然後執行下麵的以下 mvn 命令：

C:\MVN\trucks>mvn clean package

Maven 將開始構建專案:

[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 應用

打開 C:\ < MVN < trucks < target < 檔夾，找到 trucks.war 檔，並複製到你的 web 伺服器的 web 應用目錄，然後重啟 web 伺服器。

測試 Web 應用

訪問以下 URL 運行 web 應用：

http://:/trucks/index.jsp

驗證結果：