如何在Ant部署中配置代理设置？

正在构建groovyldap项目，执行ant命令时遭遇依赖解析失败，报错显示无法连接Maven仓库，怀疑是代理问题。原本期望Ant自动使用系统环境变量的代理，请问如何在Ant部署中设置代理？

执行ant命令的输出如下：

$ ant
Buildfile: /Users/user/Projects/groovyldap/build.xml

prepare:

resolve:
[ivy:retrieve] :: Apache Ivy 2.5.1 - 20221101102211 :: https://ant.apache.org/ivy/ ::
[ivy:retrieve] :: loading settings :: url = jar:file:/usr/local/Cellar/ant/1.10.13/libexec/lib/ivy-2.5.1.jar!/org/apache/ivy/core/settings/ivysettings.xml
[ivy:retrieve] :: resolving dependencies :: Apache Directory Project#groovyldap;working@redacted.example.com
[ivy:retrieve]  confs: [default]
[ivy:retrieve] :: resolution report :: resolve 494ms :: artifacts dl 0ms
        ---------------------------------------------------------------------
        |                  |            modules            ||   artifacts   |
        |       conf       | number| search|dwnlded|evicted|| number|dwnlded|
        ---------------------------------------------------------------------
        |      default     |   1   |   0   |   0   |   0   ||   0   |   0   |
        ---------------------------------------------------------------------
[ivy:retrieve] 
[ivy:retrieve] :: problems summary ::
[ivy:retrieve] :::: WARNINGS
[ivy:retrieve]          module not found: groovy#groovy;1.0
[ivy:retrieve]  ==== local: tried
[ivy:retrieve]    /Users/user/.ivy2/local/groovy/groovy/1.0/ivys/ivy.xml
[ivy:retrieve]    -- artifact groovy#groovy;1.0!groovy.jar:
[ivy:retrieve]    /Users/user/.ivy2/local/groovy/groovy/1.0/jars/groovy.jar
[ivy:retrieve]  ==== shared: tried
[ivy:retrieve]    /Users/user/.ivy2/shared/groovy/groovy/1.0/ivys/ivy.xml
[ivy:retrieve]    -- artifact groovy#groovy;1.0!groovy.jar:
[ivy:retrieve]    /Users/user/.ivy2/shared/groovy/groovy/1.0/jars/groovy.jar
[ivy:retrieve]  ==== public: tried
[ivy:retrieve]    https://repo1.maven.org/maven2/groovy/groovy/1.0/groovy-1.0.pom
[ivy:retrieve]    -- artifact groovy#groovy;1.0!groovy.jar:
[ivy:retrieve]    https://repo1.maven.org/maven2/groovy/groovy/1.0/groovy-1.0.jar
[ivy:retrieve]          ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:retrieve]          ::          UNRESOLVED DEPENDENCIES         ::
[ivy:retrieve]          ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:retrieve]          :: groovy#groovy;1.0: not found
[ivy:retrieve]          ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:retrieve] :::: ERRORS
[ivy:retrieve]  Server access error at url https://repo1.maven.org/maven2/groovy/groovy/1.0/groovy-1.0.pom (java.net.ConnectException: Connection refused)
[ivy:retrieve]  Server access error at url https://repo1.maven.org/maven2/groovy/groovy/1.0/groovy-1.0.jar (java.net.ConnectException: Connection refused)
[ivy:retrieve] 
[ivy:retrieve] :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS

BUILD FAILED
/Users/user/Projects/groovyldap/build.xml:43: impossible to resolve dependencies:
        resolve failed - see output for details

Total time: 1 second

1. 命令行临时设置代理 #

执行Ant时直接传递JVM代理参数，适合临时使用：

ant -Dhttp.proxyHost=你的代理IP或域名 -Dhttp.proxyPort=代理端口 -Dhttps.proxyHost=你的代理IP或域名 -Dhttps.proxyPort=代理端口

如果代理需要用户名和密码认证，添加对应参数：

ant -Dhttp.proxyHost=你的代理IP或域名 -Dhttp.proxyPort=代理端口 -Dhttp.proxyUser=代理用户名 -Dhttp.proxyPassword=代理密码 -Dhttps.proxyHost=你的代理IP或域名 -Dhttps.proxyPort=代理端口 -Dhttps.proxyUser=代理用户名 -Dhttps.proxyPassword=代理密码

2. 全局Ant配置文件设置 #

编辑Ant的全局配置文件（路径通常为~/.ant/ant.conf，若不存在则创建；或ANT_HOME/etc/ant.conf），添加以下配置：

http.proxyHost=你的代理IP或域名
http.proxyPort=代理端口
https.proxyHost=你的代理IP或域名
https.proxyPort=代理端口
# 若需认证，取消下面两行注释并填写信息
# http.proxyUser=代理用户名
# http.proxyPassword=代理密码
# https.proxyUser=代理用户名
# https.proxyPassword=代理密码

保存后，后续所有ant命令都会自动加载这些代理配置。

3. Ivy专属代理配置（针对本次依赖解析工具） #

由于本次依赖解析使用的是Apache Ivy，若上面两种方法不生效，需单独配置Ivy的代理：

1. 在项目根目录创建自定义ivysettings.xml文件，添加代理配置：

<ivysettings>
    <settings defaultResolver="public"/>
    <resolvers>
        <ibiblio name="public" m2compatible="true"/>
    </resolvers>
    <proxies>
        <proxy host="你的代理IP或域名" port="代理端口" protocol="http"/>
        <proxy host="你的代理IP或域名" port="代理端口" protocol="https"/>
        <!-- 若需认证，添加以下内容 -->
        <!-- <proxy host="你的代理IP或域名" port="代理端口" protocol="http" username="代理用户名" password="代理密码"/> -->
        <!-- <proxy host="你的代理IP或域名" port="代理端口" protocol="https" username="代理用户名" password="代理密码"/> -->
    </proxies>
</ivysettings>

2. 修改项目build.xml中的ivy:retrieve任务，指定使用自定义配置文件：

<ivy:retrieve settingsFile="${basedir}/ivysettings.xml"/>

内容的提问来源于stack exchange，提问作者3ch01c