体验maven插件功能，同时打包jar和war

体验maven插件功能，同时打包jar和war

maven 是一个java编写的用于构建系统的自动化工具,正在逐渐取代Ant,成为主流的工具.
官方主页:http://maven.apache.org/

maven打包的格式，可以为：pom , jar , maven-plugin , ejb , war , ear , rar , par。但是maven同时只能生成一种类型的包，在实际项目中，如果
同时生成几种类型的包，如生成jar,同时生成war，并将新生成的jar也打到war中。这就需要使用maven的插件功能,下面列举一些常用的插件:
1 同时生成jar和war, war在主文件中,用plugin生成jar            
         <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
    <configuration>
     <encoding>UTF-8</encoding>
    </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                        <configuration>
                            <classesDirectory>target/classes</classesDirectory>
                            <finalName>fooWebApp</finalName>
                            <outputDirectory>target/fooWebApp/WEB-INF/lib</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
2 类似于ant的文件复制 
           <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.4.1</version>
    <configuration>
     <encoding>UTF-8</encoding>
    </configuration>
                <executions>
                    <execution>
                        <id>copy-resources</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>copy-resources</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>
                                src/main/webapp/WEB-INF/lib
                            </outputDirectory>
                            <resources>
                                <resource>
                                    <directory>
                                        target/jar
                                    </directory>
                                    <filtering>true</filtering>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
3 指定jdk版本 
      <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
     <source>1.5</source>
     <target>1.5</target>
     <encoding>UTF-8</encoding>
    </configuration>
   </plugin>
4 指定编码格式 
     <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <configuration>
     <encoding>UTF-8</encoding>
    </configuration>
   </plugin>
   
注意: maven打包和构建是异步执行的，同时执行多个任务时，可能会发生IO错误，如要拷贝的文件夹正在生成。可以考虑将该任务分成多个阶段。

完整的示例:
<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>net.zhuozhe</groupId>
    <artifactId>fooWebApp</artifactId>
    <packaging>war</packaging>
    <version>1.0</version>
    <name>fooWebApp</name>
    <url>http://maven.apache.org</url>
    <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>
    <dependencies>
      <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
       <version>1.1</version>
    </dependency>
    </dependencies>
    <build>
        <finalName>fooWebApp</finalName>
   <plugins>

    <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
     <source>1.5</source>
     <target>1.5</target>
     <encoding>UTF-8</encoding>
    </configuration>
   </plugin>
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <configuration>
     <encoding>UTF-8</encoding>
    </configuration>
   </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
    <configuration>
     <encoding>UTF-8</encoding>
    </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                        <configuration>
                            <classesDirectory>target/classes</classesDirectory>
                            <finalName>fooWebApp</finalName>
                            <outputDirectory>target/fooWebApp/WEB-INF/lib</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
           
          <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.4.1</version>
    <configuration>
     <encoding>UTF-8</encoding>
    </configuration>
                <executions>
                    <execution>
                        <id>copy-resources</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>copy-resources</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>
                                src/main/webapp/WEB-INF/lib
                            </outputDirectory>
                            <resources>
                                <resource>
                                    <directory>
                                        target/jar
                                    </directory>
                                    <filtering>true</filtering>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
           
  </plugins>
    </build>
</project>