maven項目部署到Repository(Nexus)

本文將以開源的Nexus爲例，演示如何將本身開發的項目部署到Nexus Repository中，解決項目發佈、升級的問題。

（一）下載並安裝Nexus

    Nexus只需下載war包放到tomcat服務器上即可。

（二）配置Nexus Repository

1. 打開WEB管理界面：http://localhost:8081/nexus/index.html
2. 點擊右上角Log In進行登陸，默認賬號：admin、密碼：admin123
3. 點擊左側Repositories項 -> central倉庫 -> Configuration -> Download Remote Indexes=True -> Save，表示下載遠程倉庫的索引。
4. 右鍵central倉庫 -> Update Index，更新遠程倉庫索引到本地，這一步可以加速本地索引。

   說明：

• 新搭建的neuxs環境只是一個空的倉庫，須要手動和遠程中心庫進行同步，nexus默認是關閉遠程索引下載，最重要的一件事情就是開啓遠程索引下載。 找到右邊倉庫列表中的三個倉庫Apache Snapshots，Codehaus Snapshots和Maven Central，而後再沒有倉庫的configuration下把Download Remote Indexes修改成true。而後在這三個倉庫上分別右鍵，選擇Repari Index，這樣Nexus就會去下載遠程的索引文件。右鍵倉庫 -> Update Index，更新遠程倉庫索引到本地，這一步可以加速本地索引。

• 新建公司的內部倉庫，步驟爲Repositories –> Add –> Hosted Repository，在頁面的下半部分輸入框中填入Repository ID和Repository Name便可，另外把Deployment Policy設置爲Allow Redeploy

• Nexus中倉庫組的概念是Maven沒有的，在Maven看來，無論你是hosted也好，proxy也好，或者group也好，對我都是同樣的，我只管根據groupId，artifactId，version等信息向你要構件。爲了方便Maven的配置，Nexus可以將多個倉庫，hosted或者proxy合併成一個group，這樣，Maven只須要依賴於一個group，便能使用全部該group包含的倉庫的內容。

（三）在項目中配置Nexus Repository的信息

• 項目pom文件配置distributionManagement

<distributionManagement>
		<repository>
			<id>releases</id>
			<name>Nexus Release Repository</name>
			<url>http://localhost:8081/nexus/content/repositories/releases/</url>
		</repository>
		<snapshotRepository>
			<id>snapshots</id>
			<name>Nexus Snapshot Repository</name>
			<url>http://localhost:8081/nexus/content/repositories/snapshots/</url>
		</snapshotRepository>
	</distributionManagement>

• settings.xml配置帳號密碼。注意server的id與repository的id必須對應

<servers>
		<server>
			<id>releases</id>
			<username>admin</username>
			<password>admin123</password>
		</server>
		<server>
			<id>snapshots</id>
			<username>admin</username>
			<password>admin123</password>
		</server>
	</servers>

（四）發佈到Nexus Repository

• 項目中執行mvn deploy，成功以下所示

[INFO] --- maven-deploy-plugin:2.7:deploy (default-deploy) @ tenpay ---

Uploading: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/1.2/tenpay-1.2.jar
Uploading: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/1.2/tenpay-1.2.pom
Uploaded: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/1.2/tenpay-1.2.pom (2 KB at 9.7 KB/sec)
Uploaded: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/1.2/tenpay-1.2.jar (39 KB at 124.4 KB/sec)
Downloading: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/maven-metadata.xml
Downloaded: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/maven-metadata.xml (347 B at 4.3 KB/sec)
Uploading: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/maven-metadata.xml
Uploaded: http://localhost:8081/nexus/content/repositories/releases/com/capital/tenpay/maven-metadata.xml (376 B at 7.8 KB/sec)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS