How-to configure a proxy for maven

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本文出自 Suzf Blog。如未注明，均为 SUZF.NET 原创。

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前言

在国内使用Maven下载远程仓库jar包，速度真是不太理想，慢的真心无法忍受。所以，最好的解决办法是通过Maven设置代理(使用XX-Net翻墙)或者Maven使用代理。

Maven设置代理

编辑 ${user.home}/.m2/settings.xml 文件，如果该目录下没有该文件，复制 $MAVEN_HOME/conf/setting.xml

找到<proxies>节点，设置代理信息

 <proxy>
   <id>xx-net</id>
   <active>true</active>
   <protocol>http</protocol>
   <host>127.0.0.1</host>
   <port>8087</port>
 </proxy>

完成上述配置，仍然还是会有问题

[ERROR] Failed to execute goal on project xiaov: Could not resolve dependencies for project org.b3log:xiaov:war:2.2.0: Failed to collect dependencies at org.b3log:latke:jar:2.3.5 -> com.alibaba:druid:jar:1.0.16: Failed to read artifact descriptor for com.alibaba:druid:jar:1.0.16: Could not transfer artifact com.alibaba:druid:pom:1.0.16 from/to central (https://repo.maven.apache.org/maven2): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 1]

原因就是Maven走的是https，使用代理连接才会出现上述SSL认证问题。更多解决办法：点击查看，推荐使用下面的解决办法。

最简洁的Maven配置请将下述配置信息覆盖settings.xml

<?xml version="1.0" encoding="UTF-8"?>
 <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
   <proxies>
     <proxy>
       <id>xx-net</id>
       <active>true</active>
       <protocol>http</protocol>
       <host>127.0.0.1</host>
       <port>8087</port>
     </proxy>
   </proxies>
   <profiles>
     <profile>
       <id>securecentral</id>
       <repositories>
         <repository>
           <id>central</id>
           <url>http://repo1.maven.org/maven2</url>
           <releases>
             <enabled>true</enabled>
           </releases>
         </repository>
       </repositories>
       <pluginRepositories>
         <pluginRepository>
           <id>central</id>
           <url>http://repo1.maven.org/maven2</url>
           <releases>
             <enabled>true</enabled>
           </releases>
         </pluginRepository>
       </pluginRepositories>
     </profile>
   </profiles>
   <activeProfiles>
     <activeProfile>securecentral</activeProfile>
   </activeProfiles>
 </settings>

Maven使用镜像

这里推荐使用阿里Maven仓库镜像（Nexus仓库），希望能稳定存活。修改Maven的settings.xml文件，配置mirrors的子节点，添加如下mirror：

<mirror>
    <id>nexus-aliyun</id>
    <mirrorOf>*</mirrorOf>
    <name>Nexus aliyun</name>
    <url>http://maven.aliyun.com/nexus/content/groups/public</url>
</mirror>

上文来源 Abinnz's blog

以下是我个人 Jenkins Maven proxy 设置

:/usr/local/apache-maven-3.3.9# diff  -ruN conf/settings.xml.old  conf/settings.xml 
--- conf/settings.xml.old	2017-02-21 16:59:07.996000000 +0800
+++ conf/settings.xml	2017-02-21 17:01:15.496000000 +0800
@@ -88,6 +88,10 @@
    | specification in this list marked as active will be used.
    |-->
   <proxies>
+    <proxy>
+      <host>172.16.9.11</host>
+      <port>3128</port>
+    </proxy>
     <!-- proxy
      | Specification for one proxy, to be used in connecting to the network.
      |

[0] http://maven.apache.org/guides/mini/guide-proxies.html