Maven - Web 应用程序

本章教您如何使用Maven管理基于 Web 的项目。在这里您将学习如何创建/构建/部署和运行 Web 应用程序。

创建网络应用程序

要创建一个简单的 Java Web 应用程序，我们将使用maven-archetype-webapp插件。那么，让我们打开命令控制台，进入C:\MVN目录并执行以下mvn命令。

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

Maven 将开始处理并创建完整的基于 Web 的 java 应用程序项目结构，如下所示 -

C:\MVN>mvn archetype:generate -DgroupId=com.companyname.automobile -DartifactId=trucks -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
...
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-webapp:1.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: basedir, Value: C:\MVN
[INFO] Parameter: package, Value: com.companyname.automobile
[INFO] Parameter: groupId, Value: com.companyname.automobile
[INFO] Parameter: artifactId, Value: trucks
[INFO] Parameter: packageName, Value: com.companyname.automobile
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: C:\MVN\trucks
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  10.381 s
[INFO] Finished at: 2021-12-13T19:00:13+05:30
[INFO] ------------------------------------------------------------------------
C:\MVN>

现在转到 C:/MVN 目录。您将看到一个已创建的 Java 应用程序项目，名为 Trucks（在artifactId 中指定），如以下快照中所指定。以下目录结构通常用于 Web 应用程序 -

Java Web应用程序项目结构

Maven 使用标准目录布局。使用上面的例子，我们可以理解以下关键概念 -

先生。 文件夹结构和说明
1

卡车

包含 src 文件夹和 pom.xml。
2

src/主/网络应用程序

包含index.jsp和WEB-INF文件夹。
3

src/main/webapp/WEB-INF

包含 web.xml

4

src/主/资源

它包含图像/属性文件。

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>

如果您观察，您会发现 Maven 还创建了一个示例 JSP 源文件。

使用以下代码打开C:\ > MVN > Trucks > src > main > webapp >文件夹以查看 index.jsp -

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

构建网络应用程序

我们打开命令控制台，进入C:\MVN\trucks目录并执行以下mvn命令。

C:\MVN\trucks>mvn clean package

Maven 将开始构建项目。

C:\MVN\trucks>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] -----------------< com.companyname.automobile:trucks >------------------
[INFO] Building trucks Maven Webapp 1.0-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ trucks ---
[INFO] Deleting C:\MVN\trucks\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ trucks ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ trucks ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ trucks ---
[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]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ trucks ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ trucks ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-war-plugin:2.2:war (default-war) @ trucks ---
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.thoughtworks.xstream.core.util.Fields (file:/C:/Users/intel/.m2/repository/com/thoughtworks/xstream/xstream/1.3.1/xstream-1.3.1.jar) to field java.util.Properties.defaults
WARNING: Please consider reporting this to the maintainers of com.thoughtworks.xstream.core.util.Fields
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[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 [50 msecs]
[INFO] Building war: C:\MVN\trucks\target\trucks.war
[INFO] WEB-INF\web.xml already added, skipping
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.494 s
[INFO] Finished at: 2021-12-13T19:02:15+05:30
[INFO] ------------------------------------------------------------------------
C:\MVN\trucks>

部署网络应用程序

现在将C:\ > MVN > Trucks > target >文件夹中创建的Trucks.war复制到您的网络服务器 webapp 目录并重新启动网络服务器。

测试网络应用程序

使用 URL 运行 Web 应用程序：http://<server-name>:<port-number>/trucks/index.jsp。

验证输出。

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