来自:http://shiyanjun.cn/archives/180.html
使用Maven来构建应用程序,可以非常方便地管理应用相关的资源。众所周知,应用程序中涉及到的一些依赖关系,如Java应用程序依赖jar文 件,如果只是手动找到相应的资源,可能需要花费一些时间。而且,即使已经积累了库文件,在未来应用程序升级以后,还要考虑到依赖库文件的升级情况,再次搜 索收集。
还有一个问题,对应用程序依赖文件的管理是个非常复杂工作,占用存储空间不说,还可能因为应用之间的版本问题导致依赖冲突。使用Maven的pom模型来构建应用程序,可以更加有效地的管理,而且配置内容非常清晰(有时多了,可能pom文件显得有点臃肿)。
下面将常用的Maven配置,整理如下,以备参考。首先,整理一个简单的目录,作为快速查询之用:
- 设置字符集
- 拷贝src/main/resources/资源文件
- 编译代码
- 、编译打包成jar文件
- 构建测试用例配置
- 输出依赖jar文件到指定目录
- 配置指定的repository
- 将应用及其依赖jar文件打成一个jar文件
具体配置的详细内容,如下所示:
1、设置字符集
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
2、拷贝src/main/resources/资源文件
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>package</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<encoding>${project.build.sourceEncoding}</encoding>
<outputDirectory>${project.build.directory}</outputDirectory>
<resources>
<resource>
<directory>src/main/resources/</directory>
<includes>
<include>*.properties</include>
<include>*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
3、编译代码
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
可以指定源代码编译级别。
4、编译打包成jar文件
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>without-configs</classifier>
<excludes>
<exclude>*.properties</exclude>
<exclude>*.xml</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>
</pluginManagement>
</build>
可以指定打包后jar文件的文件名后缀,同时可以设置是否将配置文件也打包到jar文件中。
5、构建测试用例配置
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.9</version>
<configuration>
<skip>true</skip>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
构建应用时,可以配置是否执行测试用例代码,也可以配置如果测试用例未通过是否忽略。
6、输出依赖jar文件到指定目录
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<versionRange>[2.0,)</versionRange>
<goals>
<goal>copy-dependencies</goal>
<goal>unpack</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore />
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.8</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
上面,和pluginManagement并列的plugins元素中配置的是拷贝依赖jar文件到target/lib目录下面,如果在 Eclipse中出现maven-dependency-plugin (goals “copy-dependencies”, “unpack”) is not supported by m2e错误,上面pluginManagement元素中的配置,可以解决这个错误提示。
7、配置指定的repository
<repositories>
<repository>
<id>cloudera</id>
<url>https://repository.cloudera.com/artifactory/cloudera-repos/</url>
</repository>
</repositories>
如果我们需要要的一些依赖jar文件在maven*repository中没有,可以在pom文件中配置特定的repository,一般需要配置id和url。
8、将应用及其依赖jar文件打成一个jar文件
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>org.shirdrn.solr.cloud.index.hadoop.SolrCloudIndexer</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
9,assembly报错不好用时,用下面的方法
原因:http://chenzhou123520.iteye.com/blog/1706242
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>1.4</version>
<configuration>
<createDependencyReducedPom>true</createDependencyReducedPom>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass></mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>