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用shade插件build可执行jar包

 5 years ago
source link: http://ericcenblog.com/2018/07/05/yong-shadecha-jian-buildke-zhi-xing-jarbao/?amp%3Butm_medium=referral
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之前一直用assembly插件来build可执行的jar包，但用assembly插件有个问题，就是在build有依赖到Spring Framework的jar的时候，像META-INF目录下面的如spring.handlers和spring.schemas文件就会被互相覆盖，初了Spring Framework，我们常用的SPI，如果有两个SPI的名字一样(当然，这是不好的practice),也就是说如果META-INF/services目录有两个名字一样的文件，也会被互相覆盖。这个时候，用shade插件就有办法避免。

Shade插件如下：

<plugin> 

                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.4.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>YOUR_MAIN_CLASS_FULL_QUILIFIER_NAME</mainClass>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.handlers</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.schemas</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/services/YOUR_SPI_SERVICE_FILE</resource>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

在configuration里面，指定AppendingTransformer来追加内容，而不是互相覆盖.


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