150 lines
12 KiB
HTML
150 lines
12 KiB
HTML
<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="UTF-8">
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<title>Redkale(红菜苔)--基于Java 8全新的微服务开源框架 - Redkale官网</title>
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<meta name="keywords" content="Redkale,redkale,java,微服务,架构"/>
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<meta name="description" content="Redkale(红菜苔)是基于Java 8全新的微服务开源框架"/>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" type="text/css" href="stylesheets/stylesheet.css" media="screen">
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</head>
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<body>
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<section class="page-header">
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<a href="index.html" class="project-name">Redkale</a>
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<h2 class="project-tagline"></h2>
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<a href="redkale.html" class="btn">Redkale 入门</a>
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<a href="convert.html" class="btn">Convert 组件</a>
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<a href="service.html" class="btn">Service 组件</a>
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<a href="source.html" class="btn">Source 组件</a>
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<a href="net.html" class="btn">Net 组件</a>
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<a href="watch.html" class="btn">Watch 组件</a>
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<a href="plugins.html" class="btn">Redkale 插件</a>
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<a href="articles.html" class="btn">技术文章</a>
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</section>
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<section class="main-content">
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<h3>Redkale 入门教程 01 -- Hello Word！</h3>
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<p>
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<a href="index.html" target="_blank">Redkale</a> 可以说是Java界最精简的框架，不到1M的jar包可以替代Tomcat、Spring/Spring Boot、Hibernate/MyBatis、JackJson/fastjson、Netty的集合，四两拨千斤。低调开源一年多，经过两次大的改善后终于达到让自己满意的地步。Redkale不仅仅提供简易的API，还附有很多不同于传统思维的设计思路。由于时间有限，一年多也没写入门教程，现在开始抽点时间写一些教程，希望能给想学Redkale的同学一点帮助。 废话不多说，下面进入正题。<br/>
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</p>
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<p>下载Redkale</p>
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<p>
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源码可以从 <a href="https://github.com/redkale" target="_blank" >https://github.com/redkale</a> 和 <a href="http://git.oschina.net/redkale/redkale" target="_blank" >http://git.oschina.net/redkale/redkale</a> 下载 。<br/>
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jar包可以从 <a href="http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.redkale%22%20AND%20a%3A%22redkale%22" target="_blank" >http://search.maven.org</a> 和 <a href="https://repo1.maven.org/maven2/org/redkale/redkale/" target="_blank" >https://repo1.maven.org/maven2/org/redkale/redkale/</a> 下载最新版本的包。<br/>
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当前最新版为 1.8， 下载 redkale-1.8.0.tar.gz 放在本地。<br/>
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</p>
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<p>创建工程</p>
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<p>
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本人使用NetBeans很多年了，所以本教程以NetBeans来创建工程， 使用IntelliJ IDEA 或 Eclipse的同学请自行参考。
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</p>
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<p>
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首先创建一个"<b>Java应用程序</b>"项目, 注意： 不管是否Web项目，都不要创建Web应用程序。
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</p>
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<p style="text-align: center;"><img src="images/hello_01.png" alt=""/><img src="images/hello_02.png" alt=""/></p>
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<p>
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创建完空项目后，将 redkale-1.8.0.tar.gz 解压覆盖到项目的目录下。
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</p>
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<p style="text-align: center;"><img src="images/hello_03.png" alt=""/><img src="images/hello_04.png" alt=""/></p>
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<p>
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点击项目右键进入“属性”-> “库”中，点击 “添加JAR/文件夹”找到项目lib目录下的redkale-1.8.0.jar 并导入。
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</p>
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<p style="text-align: center;"><img src="images/hello_05.png" alt=""/><img src="images/hello_06.png" alt=""/></p>
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<p>
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点击“源”，在下面测试包中导入项目目录下的conf目录，这样方便编辑conf下的配置文件(在上面src中导入会打包进jar中)。
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</p>
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<p style="text-align: center;"><img src="images/hello_07.png" alt=""/></p>
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<p>
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点击“运行”，在主类中输入 "<b>org.redkale.boot.Application</b>"，然后点击“确定”。
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</p>
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<p style="text-align: center;"><img src="images/hello_08.png" alt=""/></p>
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<p>
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编写HelloService类。
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</p>
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<div class="highlight"><pre><span></span><span class="kn">package</span> <span class="n">com.redkale.demo</span><span class="o">;</span>
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<span class="kn">import</span> <span class="n">org.redkale.net.http.*</span><span class="o">;</span>
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<span class="kn">import</span> <span class="n">org.redkale.service.Service</span><span class="o">;</span>
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<span class="nd">@RestService</span><span class="o">(</span><span class="n">automapping</span> <span class="o">=</span> <span class="kc">true</span><span class="o">)</span>
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<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloService</span> <span class="kd">implements</span> <span class="n">Service</span> <span class="o">{</span>
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<span class="kd">public</span> <span class="n">String</span> <span class="nf">sayHello</span><span class="o">()</span> <span class="o">{</span>
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<span class="k">return</span> <span class="s">"Hello World！"</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="kd">public</span> <span class="n">String</span> <span class="nf">hi</span><span class="o">(</span><span class="n">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">return</span> <span class="s">"Hi, "</span> <span class="o">+</span> <span class="n">name</span> <span class="o">+</span> <span class="s">"！"</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="o">}</span>
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</pre></div>
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<p>
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此类提供两个方法：say 和 hi。编写完后按"<b>F6</b>" 直接运行。
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</p>
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<p style="text-align: center;"><img src="images/hello_09.png" alt=""/></p>
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<p>
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在浏览器输入: http://127.0.0.1:6060/pipes/hello/say 可以看到结果：
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</p>
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<p style="text-align: center;"><img src="images/hello_10.png" alt=""/></p>
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<p>
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在浏览器输入: http://127.0.0.1:6060/pipes/hello/hi?name=Redkale 可以看到结果：
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</p>
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<p style="text-align: center;"><img src="images/hello_11.png" alt=""/></p>
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<p>
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访问地址的端口6060和前缀pipes是通过conf/application.xml文件进行配置：
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</p>
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<p style="text-align: center;"><img src="images/hello_12.png" alt=""/></p>
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<p>
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至此，一个简单的Hello服务就开发和调试完成了。可以看出，代码简单很多，不需要太多配置、maven和其他依赖包。<br>
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可能有人会疑惑: HelloServie为什么能分配到hello前缀？ sayHello为什么会映射到/pipes/hello/say 请求？ Redkale为了减少Annotation配置采取了一些默认值的策略， 在Redkale里， 一个Service视为一个模块或服务，所以需要有模块(服务)名的概念，用于服务管理和鉴权，通常需要通过@RestServie.name来指定模块名，没有指定则默认将Service类名的Service字样之前的字符串视为模块名，如HelloService和HelloServiceImpl都会采用hello作为模块名。方法名的默认值策略也是类似，将模块名字样之前的字符串作为方法名，如sayHello和sayHelloMe 都会用say作为默认值。参数名如果没有指定@RestParam.name会自动采用代码的变量名。 完全标记Rest注解的HelloService源码如下：
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</p>
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<div class="highlight"><pre><span></span><span class="kn">package</span> <span class="n">com.redkale.demo</span><span class="o">;</span>
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<span class="kn">import</span> <span class="n">org.redkale.net.http.*</span><span class="o">;</span>
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<span class="kn">import</span> <span class="n">org.redkale.service.Service</span><span class="o">;</span>
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<span class="nd">@RestService</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">"hello"</span><span class="o">)</span>
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<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloService</span> <span class="kd">implements</span> <span class="n">Service</span> <span class="o">{</span>
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<span class="nd">@RestMapping</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">"say"</span><span class="o">)</span>
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<span class="kd">public</span> <span class="n">String</span> <span class="nf">sayHello</span><span class="o">()</span> <span class="o">{</span>
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<span class="k">return</span> <span class="s">"Hello World！"</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="nd">@RestMapping</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">"hi"</span><span class="o">)</span>
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<span class="kd">public</span> <span class="n">String</span> <span class="nf">hi</span><span class="o">(</span><span class="nd">@RestParam</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">"name"</span><span class="o">)</span> <span class="n">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">return</span> <span class="s">"Hi, "</span> <span class="o">+</span> <span class="n">name</span> <span class="o">+</span> <span class="s">"！"</span><span class="o">;</span>
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<span class="o">}</span>
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<span class="o">}</span>
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</pre></div>
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<br/>
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<p>
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这段代码与上面那段是等价的。部署也很简单， 将项目目录中dist目录下的redkale-demo.jar复制到lib下，运行bin/start.bat 即可启动HTTP服务。
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</p>
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<p>
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转载请注明出处：<a href="https://redkale.org/course01_hello.html" target="_blank">https://redkale.org/course01_hello.html</a>
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</p>
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<footer class="site-footer">
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<span class="site-footer-owner"> 欢迎加入Redkale QQ群: 527523235</span>
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