1. 點選前往檔案夾

輸入/users/<user name>/.m2

回車

進入到該目錄下，建立settings.xml，預設是沒有該檔案的，eclipse的maven工具安裝時不會新建該檔案

而該檔案上方的repository資料夾是用來存放通過maven下載的外掛的，如下圖

2. 開啟eclipse偏好設定

進入maven-user settings，點選user setting的browse按鈕

選擇新建的settings.xml檔案

user setting右邊就會出現open file按鈕

點選open file按鈕就會在eclipse裡面開啟settings.xml檔案

3. 在開啟的檔案裡輸入

<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
	<mirrors>
		<!-- mirror | Specifies a repository mirror site to use instead of a given 
			repository. The repository that | this mirror serves has an ID that matches 
			the mirrorOf element of this mirror. IDs are used | for inheritance and direct 
			lookup purposes, and must be unique across the set of mirrors. | -->
		<mirror>
			<id>nexus-aliyun</id>
			<mirrorOf>central</mirrorOf>
			<name>Nexus aliyun</name>
			<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
		</mirror>
		<mirror>
			<id>nexus-aliyun-thirdparty</id>
			<mirrorOf>thirdparty</mirrorOf>
			<name>Nexus aliyun thirdparty</name>
			<url>http://maven.aliyun.com/nexus/content/repositories/thirdparty/</url>
		</mirror>
	</mirrors>

	<profiles>
		<profile>
			<id>default</id>
			<repositories>
				<repository>
					<id>nexus</id>
					<name>local private nexus</name>
					<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
					<releases>
						<enabled>true</enabled>
					</releases>
					<snapshots>
						<enabled>false</enabled>
					</snapshots>
				</repository>
			</repositories>
			<pluginRepositories>
				<pluginRepository>
					<id>nexus</id>
					<name>local private nexus</name>
					<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
					<releases>
						<enabled>true</enabled>
					</releases>
					<snapshots>
						<enabled>false</enabled>
					</snapshots>
				</pluginRepository>
			</pluginRepositories>
		</profile>
	</profiles>
</settings>
 

參考：

把參考文章裡的連結換成aliyun的，開源中國的用不了了

用文章裡的寫法不會報無法讀取settings.xml錯誤

而且經過試驗，下載好外掛後，pom.xml也不會報錯，下載速度也比較快