maven多模块工程打包部署

     一般maven多模块工程结构如下图，图中分为dao数据层和上层web层(当然还可以有service层),在进行多模块划分的时候，一般将dao层采用jar进行打包，web层进行war打包。在进行war包部署时，发现dao是以jar包形式存在于lib包目录下，如果在部署服务器上需要进行相关配置修改会比较麻烦。因此研究了下用maven进行合并打包的方法：

1.确保dao pom.xml中有以下配置

<resources>
    <resource>
        <directory>${basedir}/src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
            <include>**/*.properties</include>
        </includes>
    </resource>
    <resource>
        <directory>${basedir}/src/main/resources</directory>
    </resource>
</resources>

2.在dao目录下执行：mvn clean install -Dmaven.test.skip=true,以生成jar包

3.在web工程pom.xml添加以下插件配置

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
        <execution>
            <id>unpack</id>
            <phase>generate-resources</phase>
            <goals>
                <goal>unpack</goal>
            </goals>
            <configuration>
                <artifactItems>
                    <artifactItem>
                        <groupId>com.test</groupId>
                        <artifactId>dao</artifactId>
                        <version>1.0</version>
                        <type>jar</type>
                        <overWrite>true</overWrite>
                        <outputDirectory>./target/classes</outputDirectory>
                    </artifactItem>
                </artifactItems>
            </configuration>
        </execution>
    </executions>
</plugin>

上述插件表示将dao-1.0.jar解压至web工程的target/classes目录中(即工程编译源码目录)

4.运行web工程，即可发现dao相关配置文件及源码已合并过来。（注意，此时在默认的war包的lib中还会包含dao的jar）

 若还需要对war工程进行jar打包部署，则在web工程pom.xml中添加jar打包插件即可

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <executions>
        <execution>
            <id>1</id>
            <phase>package</phase>
            <goals>
                <goal>jar</goal>
            </goals>
            <configuration>
                <classesDirectory>./target/classes</classesDirectory>
                <excludes>
                    <exclude>*.properties</exclude>
                    <exclude>*.xml</exclude>
                </excludes>
                <finalName>web</finalName>
                <outputDirectory>./target/WEB-INF/lib</outputDirectory>
            </configuration>
        </execution>
    </executions>
</plugin>

        加入后，在web下重新执行mvn install命令，会在target/WEB-INF/lib目录下生成web.jar文件,jar中不包含properties和xml文件(去掉excludes，默认情况下会将所有文件进行打包)。

       在上面情况下并没有将配置文件打包，因此需要将配置文件进行拷贝：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>2.4.3</version>
    <executions>
        <execution>
            <id>copy-resources</id>
            <phase>package</phase>
            <goals>
                <goal>copy-resources</goal>
            </goals>
            <configuration>
                <encoding>UTF-8</encoding>
                <outputDirectory>./target/WEB-INF/classes</outputDirectory>
                <resources>
                    <resource>
                        <directory>./target/classes</directory>
                        <includes>
                            <include>*.properties</include>
                        </includes>
                        <filtering>true</filtering>
                    </resource>
                </resources>
            </configuration>
        </execution>
        <!-- 拷贝web.xml文件-->
        <execution>
            <id>copy-web-xml</id>
            <phase>package</phase>
            <goals>
                <goal>copy-resources</goal>
            </goals>
            <configuration>
                <encoding>UTF-8</encoding>
                <outputDirectory>./target/WEB-INF</outputDirectory>
                <resources>
                    <resource>
                        <directory>./src/main/webapp/WEB-INF</directory>
                        <includes>
                            <include>*.xml</include>
                        </includes>
                        <filtering>true</filtering>
                    </resource>
                </resources>
            </configuration>
        </execution>
    </executions>
</plugin>

      通过上面配置方式，则可将配置文件拷贝至target/WEB-INF/classes目录下

      通过上述配置，对于web工程部署，还缺少所依赖的其他jar包，因此需要将jar包拷贝过来(同时去除依赖的dao)：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
        <execution>
            <id>copy</id>
            <phase>install</phase>
            <goals>
                <goal>copy-dependencies</goal>
            </goals>
            <configuration>
                <outputDirectory>./target/WEB-INF/lib</outputDirectory>
                <excludeGroupIds>com.test</excludeGroupIds>
            </configuration>
        </execution>
    </executions>
</plugin>

通过以上步骤可在target目录看到web常规工程部署结构：