Maven – web 实例

Maven提供了不少项目模板,例如 web项目模板:maven-archetype-webapp、Java应用模板:maven-archetype-quickstart等等,开发人员可以通过执行maven的archetype:generate 基于这些项目模板生成项目。

生成项目命令格式:

mvn archetype:generate -DgroupId=com.qikegu.com -DartifactId=qikegu-maven-web -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false  

-DarchetypeArtifactId=maven-archetype-webapp 指定了项目模板maven-archetype-webapp

1. 创建项目

我们将基于项目模板maven-archetype-webapp,生成一个web项目。

执行命令

mvn archetype:generate -DgroupId=com.qikegu.com -DartifactId=qikegu-maven-web -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false 

命令输出

执行上面的命令后,命令行输出如下,可以看到项目已经成功生成。

[INFO] Scanning for projects...                                                                                             
[INFO]                                                                                                                      
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------                                             
[INFO] Building Maven Stub Project (No POM) 1                                                                               
[INFO] --------------------------------[ pom ]---------------------------------                                             
[INFO]                                                                                                                      
[INFO] >>> maven-archetype-plugin:3.0.1:generate (default-cli) > generate-sources @ standalone-pom >>>                      
[INFO]                                                                                                                      
[INFO] <<< maven-archetype-plugin:3.0.1:generate (default-cli) < generate-sources @ standalone-pom <<<                      
[INFO]                                                                                                                      
[INFO]                                                                                                                      
[INFO] --- maven-archetype-plugin:3.0.1:generate (default-cli) @ standalone-pom ---                                         
[INFO] Generating project in Batch mode                                                                                     
[WARNING] No archetype found in remote catalog. Defaulting to internal catalog                                              
Downloading from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetypes/maven-archetype-web
app/1.0/maven-archetype-webapp-1.0.pom                                                                                      
Downloaded from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetypes/maven-archetype-weba
pp/1.0/maven-archetype-webapp-1.0.pom (533 B at 875 B/s)                                                                    
Downloading from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetypes/maven-archetype-bun
dles/2/maven-archetype-bundles-2.pom                                                                                        
Downloaded from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetypes/maven-archetype-bund
les/2/maven-archetype-bundles-2.pom (1.5 kB at 3.5 kB/s)                                                                    
Downloading from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetype/maven-archetype-pare
nt/1/maven-archetype-parent-1.pom                                                                                           
Downloaded from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetype/maven-archetype-paren
t/1/maven-archetype-parent-1.pom (1.3 kB at 2.6 kB/s)                                                                       
Downloading from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/maven-parent/4/maven-parent-4.
pom                                                                                                                         
Downloaded from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/maven-parent/4/maven-parent-4.p
om (10.0 kB at 24 kB/s)                                                                                                     
Downloading from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetypes/maven-archetype-web
app/1.0/maven-archetype-webapp-1.0.jar                                                                                      
Downloaded from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/archetypes/maven-archetype-weba
pp/1.0/maven-archetype-webapp-1.0.jar (3.9 kB at 7.9 kB/s)                                                                  
[INFO] ----------------------------------------------------------------------------                                         
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-webapp:1.0                 
[INFO] ----------------------------------------------------------------------------                                         
[INFO] Parameter: basedir, Value: G:\project\test                                                                           
[INFO] Parameter: package, Value: com.qikegu.com                                                                            
[INFO] Parameter: groupId, Value: com.qikegu.com                                                                            
[INFO] Parameter: artifactId, Value: qikegu-maven-web                                                                       
[INFO] Parameter: packageName, Value: com.qikegu.com                                                                        
[INFO] Parameter: version, Value: 1.0-SNAPSHOT                                                                              
[INFO] project created from Old (1.x) Archetype in dir: G:\project\test\qikegu-maven-web                                    
[INFO] ------------------------------------------------------------------------                                             
[INFO] BUILD SUCCESS                                                                                                        
[INFO] ------------------------------------------------------------------------                                             
[INFO] Total time:  6.654 s                                                                                                 
[INFO] Finished at: 2019-04-22T16:33:38+08:00                                                                               
[INFO] ------------------------------------------------------------------------                                             

Kevin@KEVIN-PC G:\project\test                                                                                              

项目结构

进入生成的项目目录,查看项目目录结构如下:

G:\PROJECT\TEST\QIKEGU-MAVEN-WEB
│  pom.xml
│
└─src
    └─main
        ├─resources
        └─webapp
            │  index.jsp
            │
            └─WEB-INF
                    web.xml

可以看到,maven自动创建了3个文件:pom.xml、index.jsp和web.xml。

让我们快速浏览一下这些文件:

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.qikegu.com</groupId>
  <artifactId>qikegu-maven-web</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>qikegu-maven-web 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>qikegu-maven-web</finalName>
  </build>
</project>

index.jsp

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

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
</web-app>

2. 构建项目

在命令行中,切换到项目目录,执行以下命令

> mvn package

可以看到项目目录下多了一个target目录,target目录下已经生成qikegu-maven-web.war包。

3. 部署项目

qikegu-maven-web.war包拷贝到webserver(如tomcat)下的webapp目录下,重启服务器。

然后就可通过浏览器访问了,通常url如下(根据服务器配置):

http://localhost:80/qikegu-maven-web/index.jsp


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