一年前，我遇到了将代码部分动态加载到Java应用程序中的需要，而不必每次都重新编译或重新打包我的软件。基本上，我在寻找插件系统。

当时只有一个值得一提的开源插件系统PF4J，但是我觉得它有点笨拙和麻烦。我想要一些简单的东西，我可以在几分钟内提高生产力。所以我决定自己写。

输入PlugFace。
第一次迭代简直太糟糕了，因为当时我只是公司的一名实习生，仍然在学习实际的Java，并且不具备编写良好，可用框架的知识。

缺点

第一个实现不是我想要的那么简单。
有实现的接口，要使用的反射，要编写的配置文件，沙盒许可系统，插件之间的依赖项注入半工半断的尝试，以及编写和使用它们的大量汗水它。
这不是世界上最伟大的软件。
这是旧的PlugFace插件的示例：

[code]<span style="color:#f8f8f2"><span style="color:#eff0f9"><code><span style="color:#f9690e">package</span> <span style="color:#f8f8f2">org</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugface</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">demo</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugins</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">greet</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.Plugin</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.PluginConfiguration</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.PluginStatus</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.demo.app.sdk.Greeter</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.impl.DefaultPluginConfiguration</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">java.util.Collections</span><span style="color:#f9690e">;</span>

<span style="color:#f39c12">public</span> <span style="color:#f39c12">class</span> <span style="color:#7ed07e">GreeterPlugin</span> <span style="color:#f39c12">implements</span> <span style="color:#7ed07e">Plugin</span><span style="color:#f9690e"><</span><span style="color:#7ed07e">String</span><span style="color:#f9690e">[],</span> <span style="color:#7ed07e">String</span><span style="color:#f9690e">>,</span> <span style="color:#7ed07e">Greeter</span><span style="color:#f9690e">{</span>

<span style="color:#f39c12">private</span> <span style="color:#f39c12">final</span> <span style="color:#7ed07e">String</span> <span style="color:#f8f8f2">name</span><span style="color:#f9690e">;</span>
<span style="color:#f39c12">private</span> <span style="color:#7ed07e">PluginConfiguration</span> <span style="color:#f8f8f2">configuration</span><span style="color:#f9690e">;</span>
<span style="color:#f39c12">private</span> <span style="color:#7ed07e">PluginStatus</span> <span style="color:#f8f8f2">status</span><span style="color:#f9690e">;</span>
<span style="color:#f39c12">private</span> <span style="color:#f39c12">boolean</span> <span style="color:#f8f8f2">enabled</span><span style="color:#f9690e">;</span>

<span style="color:#f39c12">public</span> <span style="color:#7ed07e">GreeterPlugin</span> <span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f8f8f2">name</span> <span style="color:#f9690e">=</span> <span style="color:#f2ca27">"greeter"</span><span style="color:#f9690e">;</span>
<span style="color:#f8f8f2">configuration</span> <span style="color:#f9690e">=</span> <span style="color:#f39c12">new</span> <span style="color:#7ed07e">DefaultPluginConfiguration</span><span style="color:#f9690e">();</span>
<span style="color:#f8f8f2">status</span> <span style="color:#f9690e">=</span> <span style="color:#7ed07e">PluginStatus</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">READY</span><span style="color:#f9690e">;</span>
<span style="color:#f8f8f2">enabled</span> <span style="color:#f9690e">=</span> <span style="color:#f39c12">false</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">void</span> <span style="color:#7ed07e">start</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">throw</span> <span style="color:#f39c12">new</span> <span style="color:#7ed07e">UnsupportedOperationException</span><span style="color:#f9690e">(</span><span style="color:#f2ca27">"This plugin operates in single mode only"</span><span style="color:#f9690e">);</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">void</span> <span style="color:#7ed07e">stop</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">throw</span> <span style="color:#f39c12">new</span> <span style="color:#7ed07e">UnsupportedOperationException</span><span style="color:#f9690e">(</span><span style="color:#f2ca27">"This plugin operates in single mode only"</span><span style="color:#f9690e">);</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">String</span> <span style="color:#7ed07e">execute</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">String</span><span style="color:#f9690e">[]</span> <span style="color:#f8f8f2">parameters</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#7ed07e">greet</span><span style="color:#f9690e">();</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">PluginConfiguration</span> <span style="color:#7ed07e">getPluginConfiguration</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f9690e">(</span><span style="color:#7ed07e">PluginConfiguration</span><span style="color:#f9690e">)</span> <span style="color:#7ed07e">Collections</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">unmodifiableMap</span><span style="color:#f9690e">(</span><span style="color:#f8f8f2">configuration</span><span style="color:#f9690e">);</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">void</span> <span style="color:#7ed07e">setPluginConfiguration</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">PluginConfiguration</span> <span style="color:#f8f8f2">configuration</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">this</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">configuration</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">configuration</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">String</span> <span style="color:#7ed07e">getName</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f8f8f2">name</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">PluginStatus</span> <span style="color:#7ed07e">getStatus</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f8f8f2">status</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">void</span> <span style="color:#7ed07e">setStatus</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">PluginStatus</span> <span style="color:#f8f8f2">pluginStatus</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f8f8f2">status</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">pluginStatus</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">void</span> <span style="color:#7ed07e">enable</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">this</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">enabled</span> <span style="color:#f9690e">=</span> <span style="color:#f39c12">true</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">void</span> <span style="color:#7ed07e">disable</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">this</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">enabled</span> <span style="color:#f9690e">=</span> <span style="color:#f39c12">false</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">boolean</span> <span style="color:#7ed07e">isEnabled</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f8f8f2">enabled</span> <span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">String</span> <span style="color:#7ed07e">greet</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f2ca27">"Hello PlugFace!"</span><span style="color:#f9690e">:</span>
<span style="color:#f9690e">}</span>

<span style="color:#f9690e">}</span>
</code></span></span>

这些东西简直是怪物，界面巨大，并且充满了可争议的有用功能（例如状态和名称），并且不实用。
如果您想要比“开始”、“停止”和“执行”更复杂的行为，则必须添加自己的接口并将插件转换为该类型，才能使用它或通过反射访问方法。

这时我突然有了一个主意。当框架只能处理动态类加载时，为什么要限制用户与插件的交互方式呢？

优点

随着0.6版的发布，这个框架又复活了。这是(几乎)完整的重写。我抛弃了整个接口故事，取而代之的是一个更简洁的@Plugin(“name”)注释，对你的插件应该如何表现没有任何意见。只需让它实现应用程序知道的一些接口，然后通过它访问它。

这是相同的插件，但带有新系统：

[code]<span style="color:#f8f8f2"><span style="color:#eff0f9"><code><span style="color:#f9690e">package</span> <span style="color:#f8f8f2">org</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugface</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">demo</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugins</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">greet</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.core.annotations.Plugin</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.demo.app.sdk.Greeter</span><span style="color:#f9690e">;</span>

<span style="color:#7ed07e">@Plugin</span><span style="color:#f9690e">(</span><span style="color:#f2ca27">"greeter"</span><span style="color:#f9690e">)</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">class</span> <span style="color:#7ed07e">GreeterPlugin</span> <span style="color:#f39c12">implements</span> <span style="color:#7ed07e">Greeter</span> <span style="color:#f9690e">{</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">String</span> <span style="color:#7ed07e">greet</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f2ca27">"Hello PlugFace!"</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>
<span style="color:#f9690e">}</span>
</code></span></span>

它实现了

Greeter

我的应用程序提供的接口。现在，我的代码可以简单地检索插件并将其放入Greeter类型的变量中，而无需了解

GreeterPlugin

类。整齐！

这是我的应用程序代码。

[code]<span style="color:#f8f8f2"><span style="color:#eff0f9"><code><span style="color:#f39c12">final</span> <span style="color:#7ed07e">PluginManager</span> <span style="color:#f8f8f2">manager</span> <span style="color:#f9690e">=</span> <span style="color:#7ed07e">PluginManagers</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">defaultPluginManager</span><span style="color:#f9690e">();</span>

<span style="color:#f8f8f2">manager</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">loadPlugins</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">PluginSources</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">jarSource</span><span style="color:#f9690e">(</span><span style="color:#f2ca27">"path/to/my/plugin/jars"</span><span style="color:#f9690e">));</span>

<span style="color:#f39c12">final</span> <span style="color:#7ed07e">Greeter</span> <span style="color:#f8f8f2">greeter</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">manager</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">getPlugin</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">Greeter</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">class</span><span style="color:#f9690e">);</span>

<span style="color:#f8f8f2">greeter</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">greet</span><span style="color:#f9690e">();</span> <span style="color:#808080">// => "Hello PlugFace!"</span>
</code></span></span>

PluginManager是一个从各种来源加载插件的实用工具类，这是对旧版本的另一个改进，旧版本只以硬编码JAR加载为特色，并且通过名字和类型访问PluginContext来添加/获取/删除插件。

我还完全放弃了沙盒功能，该功能利用Java SecurityContext功能将插件限制在允许的范围内。由于处理起来很麻烦，我宁愿将其完全删除以专注于此新版本的核心功能。如果我找到一种方便的方式来实现它，我可能会在将来的版本中重新引入它。

依赖注入正确完成

旧系统试图引入的一个特性是插件相互注入的可能性。它通过将插件放入PluginConfiguration对象(基本上是一个美化过的Map<String，对象>，它可以工作，但是使用起来相当不实际。

PlugFace 0.6通过构造器使用标准

@javax.inject.Inject

注释（功能齐全，将来会在出现单个构造器的情况下成为可选的）引入了完整的依赖项注入系统，因此插件类可与任何标准DI框架（例如Spring）一起使用或Guice。
它支持使用拓扑排序的复杂依赖关系图，以及循环依赖关系检测和所有这些好东西。

[code]<span style="color:#f8f8f2"><span style="color:#eff0f9"><code><span style="color:#f9690e">package</span> <span style="color:#f8f8f2">org</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugface</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">demo</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugins</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">math</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.core.annotations.Plugin</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.demo.app.sdk.Mathematics</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">javax.inject.Inject</span><span style="color:#f9690e">;</span>

<span style="color:#7ed07e">@Plugin</span><span style="color:#f9690e">(</span><span style="color:#f2ca27">"math"</span><span style="color:#f9690e">)</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">class</span> <span style="color:#7ed07e">MathPlugin</span> <span style="color:#f39c12">implements</span> <span style="color:#7ed07e">Mathematics</span> <span style="color:#f9690e">{</span>

<span style="color:#f39c12">private</span> <span style="color:#f39c12">final</span> <span style="color:#7ed07e">SumPlugin</span> <span style="color:#f8f8f2">sum</span><span style="color:#f9690e">;</span>
<span style="color:#f39c12">private</span> <span style="color:#f39c12">final</span> <span style="color:#7ed07e">MultPlugin</span> <span style="color:#f8f8f2">mult</span><span style="color:#f9690e">;</span>

<span style="color:#7ed07e">@Inject</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">MathPlugin</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">SumPlugin</span> <span style="color:#f8f8f2">sum</span><span style="color:#f9690e">,</span> <span style="color:#7ed07e">MultPlugin</span> <span style="color:#f8f8f2">mult</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">this</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">sum</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">sum</span><span style="color:#f9690e">;</span>
<span style="color:#f39c12">this</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">mult</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">mult</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">Integer</span> <span style="color:#7ed07e">sum</span><span style="color:#f9690e">(</span><span style="color:#f39c12">int</span> <span style="color:#f8f8f2">a</span><span style="color:#f9690e">,</span> <span style="color:#f39c12">int</span> <span style="color:#f8f8f2">b</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f8f8f2">sum</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">sum</span><span style="color:#f9690e">(</span><span style="color:#f8f8f2">a</span><span style="color:#f9690e">,</span> <span style="color:#f8f8f2">b</span><span style="color:#f9690e">);</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">Integer</span> <span style="color:#7ed07e">mult</span><span style="color:#f9690e">(</span><span style="color:#f39c12">int</span> <span style="color:#f8f8f2">a</span><span style="color:#f9690e">,</span> <span style="color:#f39c12">int</span> <span style="color:#f8f8f2">b</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">return</span> <span style="color:#f8f8f2">mult</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">mult</span><span style="color:#f9690e">(</span><span style="color:#f8f8f2">a</span><span style="color:#f9690e">,</span> <span style="color:#f8f8f2">b</span><span style="color:#f9690e">);</span>
<span style="color:#f9690e">}</span>
<span style="color:#f9690e">}</span>
</code></span></span>

Spring Integration

Spring框架是Java中非常有用的工具包。它几乎具有任何功能，但其核心功能显然是依赖注入系统。由于我几乎在所有项目中都使用Spring，因此我希望PlugFace与它能够很好地集成。

如果你想使用普通的PlugFace，你可以导入plugin -core模块，但是如果你使用Spring，你可能需要切换到特殊的plugin - Spring模块。
它不仅为PluginManager和PluginContext使用自动配置的bean，而且还增加了对从中检索插件的支持

ApplicationContext

（这意味着如果未将对象作为插件找到，它将在Spring bean中进行查找），也许更重要的是，它使Spring bean成为插件中依赖项注入的可行目标。

没错，有了plugin - Spring，你不仅可以在你的插件中注入其他的插件，还可以在你的应用中注册任何Spring bean。

您的插件可以访问服务类、存储库、实用程序单例，基本上所有内容都可以在Spring上下文中找到。

[code]<span style="color:#f8f8f2"><span style="color:#eff0f9"><code><span style="color:#f9690e">package</span> <span style="color:#f8f8f2">org</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugface</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">demo</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">plugins</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">user</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.core.annotations.Plugin</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.demo.app.sdk.Greeter</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">org.plugface.demo.app.sdk.TestService</span><span style="color:#f9690e">;</span>

<span style="color:#f9690e">import</span> <span style="color:#f8f8f2">javax.inject.Inject</span><span style="color:#f9690e">;</span>

<span style="color:#7ed07e">@Plugin</span><span style="color:#f9690e">(</span><span style="color:#f2ca27">"greeter"</span><span style="color:#f9690e">)</span>
<span style="color:#f39c12">public</span> <span style="color:#f39c12">class</span> <span style="color:#7ed07e">UserPlugin</span> <span style="color:#f39c12">implements</span> <span style="color:#7ed07e">UserDetails</span> <span style="color:#f9690e">{</span>

<span style="color:#f39c12">private</span> <span style="color:#f39c12">final</span> <span style="color:#7ed07e">UserService</span> <span style="color:#f8f8f2">userService</span><span style="color:#f9690e">;</span> <span style="color:#808080">//this is a Spring service</span>

<span style="color:#7ed07e">@Inject</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">GreeterPlugin</span><span style="color:#f9690e">(</span><span style="color:#7ed07e">UserService</span> <span style="color:#f8f8f2">userService</span><span style="color:#f9690e">)</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">this</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">userService</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">userService</span><span style="color:#f9690e">;</span>
<span style="color:#f9690e">}</span>

<span style="color:#7ed07e">@Override</span>
<span style="color:#f39c12">public</span> <span style="color:#7ed07e">String</span> <span style="color:#7ed07e">getUsername</span><span style="color:#f9690e">()</span> <span style="color:#f9690e">{</span>
<span style="color:#f39c12">final</span> <span style="color:#7ed07e">User</span> <span style="color:#f8f8f2">user</span> <span style="color:#f9690e">=</span> <span style="color:#f8f8f2">userService</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">getUserById</span><span style="color:#f9690e">(</span><span style="color:#dda0dd">0L</span><span style="color:#f9690e">);</span>
<span style="color:#f39c12">return</span> <span style="color:#f8f8f2">user</span><span style="color:#f9690e">.</span><span style="color:#7ed07e">getUsername</span><span style="color:#f9690e">();</span>
<span style="color:#f9690e">}</span>
<span style="color:#f9690e">}</span>
</code></span></span>

从现在开始

将来，我还想与Guice等其他DI框架集成，并在出现新的Java插件用例时扩展当前的功能集。
在此之前，感谢您的关注，并祝您编程愉快！

原文链接：https://dev.to//matteojoliveau/plugface-reborn---the-java-plugin-system-18bm

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