一般maven多模組工程結構如下圖，圖中分為dao資料層和上層web層(當然還可以有service層),在進行多模組劃分的時候，一般將dao層採用jar進行打包，web層進行war打包。在進行war包部署時，發現dao是以jar包形式存在於lib包目錄下，如果在部署伺服器上需要進行相關配置修改會比較麻煩。因此研究了下用maven進行合併打包的方法：

1.確保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目錄下執行：mvn clean install -Dmaven.test.skip=true,以生成jar包

3.在web工程pom.xml新增以下外掛配置

<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>

上述外掛表示將dao-1.0.jar解壓至web工程的target/classes目錄中(即工程編譯原始碼目錄)

4.執行web工程，即可發現dao相關配置檔案及原始碼已合併過來。（注意，此時在預設的war包的lib中還會包含dao的jar）

 若還需要對war工程進行jar打包部署，則在web工程pom.xml中新增jar打包外掛即可

<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>

       在上面情況下並沒有將配置檔案打包，因此需要將配置檔案進行拷貝：

<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>
<!-- 拷貝web.xml檔案-->
<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>

      通過上述配置，對於web工程部署，還缺少所依賴的其他jar包，因此需要將jar包拷貝過來(同時去除依賴的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>

通過以上步驟可在target目錄看到web常規工程部署結構：