maven打包将SVN版本号打入系统。

一、实现目标：
目标一、生成的war包名称根据[项目名称]_[系统版本号]_[SVN版本号]_[打包日期]格式自动生成war包。
目标二、系统主页可以展示当前系统的最新版本信息(以上格式的版本信息)。

二、实现思路：
对于目标一：[项目名称]、[系统版本号]根据pom.xml文件中参数配置；
            [SVN版本号]从SVN服务器获取；
            [打包日期]时间戳；
根据以上信息，自动生成自定格式的war包文件。

对于目标二：将目标一生成的最终版本号以自定义属性的方式追加到META-INF/MANIFEST.MF文件下；并在系统启动的时候加载META-INF/MANIFEST.MF文件，取出并显示到指定页面文件。

三、实现过程：
1、pom.xml文件配置：

<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.sinowel</groupId>
	<artifactId>UFM</artifactId>
	<version>1.0.20</version>
	<packaging>war</packaging>
	<name>Unified Flow Management</name>
	<url>http://http://10.180.50.30:8099/scpnf</url>

	<properties>
		<maven.build.timestamp.format>yyyyMMdd</maven.build.timestamp.format>
	</properties>


	<scm>
		<connection>scm:svn:https://192.168.22.34/svn/UMPlatform4J/SCPNF/banches/UFM</connection>
		<tag>HEAD</tag>
		<url>https://192.168.22.34/svn/UMPlatform4J/SCPNF/banches/UFM</url>
	</scm>

	<dependencies>
		<!-- 略 -->
	</dependencies>


	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.1</version>
				<configuration>
					<source>1.7</source>
					<target>1.7</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>


			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>buildnumber-maven-plugin</artifactId>
				<version>1.4</version>
				<executions>
					<execution>
						<phase>validate</phase>
						<goals>
							<goal>create</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<doCheck>false</doCheck>
					<doUpdate>true</doUpdate>
				</configuration>
				<dependencies>
					<dependency>
						<groupId>com.google.code.maven-scm-provider-svnjava</groupId>
						<artifactId>maven-scm-provider-svnjava</artifactId>
						<version>2.1.1</version>
					</dependency>
					<dependency>
						<groupId>org.tmatesoft.svnkit</groupId>
						<artifactId>svnkit</artifactId>
						<version>1.8.10</version>
					</dependency>
				</dependencies>
			</plugin>


			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.4</version>
				<configuration>
					<failOnMissingWebXml>false</failOnMissingWebXml>
					<encoding>UTF-8</encoding>
					<warName>${project.artifactId}_v${project.version}r${buildNumber}b${maven.build.timestamp}</warName>
					<archive>
						<manifest>
							<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
						</manifest>
						<manifestEntries>
							<svn-version>${buildNumber}</svn-version>
							<deploy-version>${project.artifactId}_v${project.version}r${buildNumber}b${maven.build.timestamp}</deploy-version>
						</manifestEntries>
					</archive>
				</configuration>
			</plugin>

		</plugins>
	</build>

</project>

2、创建ManifestUtils.java文件，用来读取META-INF/MANIFEST.MF文件。

public class ManifestUtils {

	private static final String MANIFEST_DIRECTORY_LOCATION = "META-INF" + File.separator + "MANIFEST.MF";

	private static final String MANIFEST_ENTRY = "META-INF/MANIFEST.MF";

	/**
	 * 
	 * Creates a {@link Reader} for the manifest in the supplied exploded JAR
	 * directory.
	 * 
	 * 
	 * 
	 * @param directory
	 *            the exploded JAR directory.
	 * 
	 * @return the <code>Reader</code> or <code>null</code> if the manifest
	 *         cannot be found.
	 */
	public static final Reader manifestReaderFromExplodedDirectory(File directory) {
		if (directory == null || !directory.isDirectory()) {
			throw new IllegalArgumentException("Must supply a valid directory");
		}
		try {
			File manifestFile = new File(directory.getAbsolutePath() + File.separator + MANIFEST_DIRECTORY_LOCATION);
			if (manifestFile.exists()) {
				return new FileReader(manifestFile);
			} else {
				return null;
			}
		} catch (IOException e) {
			throw new RuntimeException(
					"Unable to read MANIFEST for exploded directory '" + directory.getAbsolutePath() + "'.", e);
		}
	}

	/**
	 * 
	 * Creates a {@link Reader} for the manifest in the supplied JAR file.
	 * 
	 * 
	 * 
	 * @param file
	 *            the JAR file.
	 * 
	 * @return the <code>Reader</code> or <code>null</code> if the manifest
	 *         cannot be found.
	 */
	public static final Reader manifestReaderFromJar(File file) {
		JarFile jar = null;
		try {
			jar = new JarFile(file);
			JarEntry entry = jar.getJarEntry(MANIFEST_ENTRY);
			if (entry != null) {
				StringWriter writer = new StringWriter();
				FileCopyUtils.copy(new InputStreamReader(jar.getInputStream(entry)), writer);
				jar.close();
				return new StringReader(writer.toString());
			} else {
				return null;
			}
		} catch (Exception e) {
			throw new RuntimeException("Cannot read MANIFEST.MF from jar '" + file.getAbsolutePath() + "'.", e);
		} finally {
			if (jar != null) {
				try {
					jar.close();
				} catch (IOException ioe) {
					throw new RuntimeException("Failed to close jar '" + file.getAbsolutePath() + "'.", ioe);
				}
			}
		}
	}

	/**
	 * 从META-INF/MANIFEST.MF文件中读取“deploy-version”发布版本号信息。
	 * 
	 * @param realPath
	 *            web发布真实路径
	 * @return
	 */
	public static String getDeployVersion(String realPath) {
		File file = new File(realPath);
		Reader reader = manifestReaderFromExplodedDirectory(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String lineTxt = null;
		String deployVersion = "";
		try {
			while ((lineTxt = bufferedReader.readLine()) != null) {
				if (lineTxt.startsWith("deploy-version:")) {
					deployVersion = lineTxt.replace("deploy-version:", "");
					return deployVersion;
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (null != bufferedReader) {
				try {
					bufferedReader.close();
				} catch (IOException e) {
				}
			}
			if (null != reader) {
				try {
					reader.close();
				} catch (IOException e) {
				}
			}
		}
		return deployVersion;
	}

}

3、在系统启动位置如ContextLoaderListener中调用ManifestUtils.getDeployVersion方法取得发布版本，并存放。例如：

String deployVersion = "";
		deployVersion = ManifestUtils.getDeployVersion(servletContext.getRealPath(""));
		servletContext.setAttribute("deployVersion", deployVersion);

4、在指定页面获取存入版本号：

<div id="deployVersion ">版本：${deployVersion }</div>