Spring中集成Groovy的四种方式

groovy是一种动态脚本语言，适用于一些可变、和规则配置性的需求，目前Spring提供ScriptSource接口，支持两种类型，一种是

ResourceScriptSource，另一种是 StaticScriptSource，但是有的场景我们需要把groovy代码放进DB中，所以我们需要扩展这个。

ResourceScriptSource：在 resources 下面写groovy类

StaticScriptSource：把groovy类代码放进XML里

DatabaseScriptSource：把groovy类代码放进数据库中

工程模块为：

ResourceScriptSource

groovy的pom

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<dependency>     <artifactId>groovy-allartifactId>     <groupId>org.codehaus.groovygroupId>     <version>2.1.9version>     <scope>compilescope>   dependency>

HelloService接口

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package com.maple.resource.groovy; /**  * @author: maple  * @version: HelloService.java, v 0.1 2020年09月25日 21:26 maple Exp $  */ public interface HelloService {   String sayHello(); }

resources下面建groovy实现类

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package com.maple.resource.groovy class HelloServiceImpl implements HelloService {   String name;   @Override   String sayHello() {     return "Hello $name. Welcome to resource in Groovy.";   } }

在spring-groovy.xml中配置

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xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:lang="http://www.springframework.org/schema/lang"     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd               http://www.springframework.org/schema/lang               http://www.springframework.org/schema/lang/spring-lang.xsd">   <lang:groovy id="helloService" script-source="classpath:groovy/HelloServiceImpl.groovy">     <lang:property name="name" value="maple">lang:property>   lang:groovy> beans>

主类 GroovyResourceApplication

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package com.maple.resource; import com.maple.resource.groovy.HelloService; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.support.ClassPathXmlApplicationContext; @SpringBootApplication public class GroovyResourceApplication {   public static void main(String[] args) {     //SpringApplication.run(GroovyResourceApplication.class, args);     ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-groovy.xml");     HelloService bean = context.getBean(HelloService.class);     String sayHello = bean.sayHello();     System.out.println(sayHello);   } }

启动并测试 

StaticScriptSource

groovy的pom

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<dependency>      <artifactId>groovy-allartifactId>      <groupId>org.codehaus.groovygroupId>      <version>2.1.9version>      <scope>compilescope>    dependency>

HelloService接口

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package com.maple.groovy.staticscript.groovy; /**  * @author: maple  * @version: HelloService.java, v 0.1 2020年09月25日 21:26 maple Exp $  */ public interface HelloService {   String sayHello(); }

在spring-groovy.xml中配置具体的实现类

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xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:lang="http://www.springframework.org/schema/lang"     xsi:schemaLocation="http://www.springframework.org/schema/beans               http://www.springframework.org/schema/beans/spring-beans.xsd               http://www.springframework.org/schema/lang               http://www.springframework.org/schema/lang/spring-lang.xsd">   <lang:groovy id="helloService">     <lang:inline-script>       import com.maple.groovy.staticscript.groovy.HelloService       class HelloServiceImpl implements HelloService {         String name;         @Override         String sayHello() {           return "Hello $name. Welcome to static script in Groovy.";         }       }     lang:inline-script>     <lang:property name="name" value="maple"/>   lang:groovy> beans>

主类 GroovyStaticscriptApplication

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package com.maple.groovy.staticscript; import com.maple.groovy.staticscript.groovy.HelloService; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.support.ClassPathXmlApplicationContext; @SpringBootApplication public class GroovyStaticscriptApplication {   public static void main(String[] args) {     //SpringApplication.run(GroovyStaticscriptApplication.class, args);     ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-groovy.xml");     HelloService bean = context.getBean(HelloService.class);     String sayHello = bean.sayHello();     System.out.println(sayHello);   } }

启动并测试 

DatabaseScriptSource

下面我们先建表，把基本工作做完，这里我使用mybatisplus，dao、service等代码省略

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CREATE TABLE `groovy_script` ( `id` BIGINT ( 20 ) NOT NULL AUTO_INCREMENT, `script_name` VARCHAR ( 64 ) NOT NULL COMMENT 'script name', `script_content` text NOT NULL COMMENT 'script content', `status` VARCHAR ( 16 ) NOT NULL DEFAULT 'ENABLE' COMMENT 'ENABLE/DISENABLE', `extend_info` VARCHAR ( 4096 ) DEFAULT NULL, `created_time` TIMESTAMP ( 6 ) NOT NULL DEFAULT CURRENT_TIMESTAMP ( 6 ), `modified_time` TIMESTAMP ( 6 ) NOT NULL DEFAULT CURRENT_TIMESTAMP ( 6 ) ON UPDATE CURRENT_TIMESTAMP ( 6 ), PRIMARY KEY ( `id` ) ) ENGINE = INNODB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8mb4 COMMENT = 'groovy script';

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INSERT INTO `gane-platform`.`groovy_script`(`id`, `script_name`, `script_content`, `status`, `extend_info`, `created_time`, `modified_time`) VALUES (1, 'helloService', 'package com.maple.resource.groovy\r\n\r\nimport com.maple.database.groovy.HelloService\r\n\r\npublic class HelloServiceImpl implements HelloService {\r\n\r\n  @Override\r\n  String sayHello(String name) {\r\n    return \"Hello \"+name+\". Welcome to database in Groovy.\";\r\n  }\r\n}', 'ENABLE', NULL, '2020-09-26 17:16:36.477818', '2020-09-27 08:23:10.790553');

方法一：

1、实时读取DB里的groovy脚本文件

2、利用GroovyClassLoader去编译脚本文件

3、把class对象注入成Spring bean

4、反射调用脚本的方法

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package com.maple.database.controller; import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.maple.database.entity.GroovyScript; import com.maple.database.groovy.SpringContextUtils; import com.maple.database.service.GroovyScriptService; import groovy.lang.GroovyClassLoader; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import javax.annotation.Resource; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; /**  * @author: maple  * @version: GroovyController.java, v 0.1 2020年09月26日 17:18 maple Exp $  */ @RestController public class GroovyController {   @Resource   private GroovyScriptService groovyScriptService;   @GetMapping("/groovyTest")   private String groovyTest() throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException {     GroovyScript groovyScript = groovyScriptService.getOne(new QueryWrapper()         .eq("script_name", "helloService").eq("status", "ENABLE"));     System.out.println(groovyScript.getScriptContent());     Class clazz = new GroovyClassLoader().parseClass(groovyScript.getScriptContent());     Object o = clazz.newInstance();     SpringContextUtils.autowireBean(o);     Method method = clazz.getMethod("sayHello", String.class);     return (String) method.invoke(o, "maple");   } }

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package com.maple.database.groovy; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; /**  * @author: maple  * @version: SpringContextUtils.java, v 0.1 2020年09月26日 17:29 maple Exp $  */ @Component public class SpringContextUtils implements ApplicationContextAware {   static ApplicationContext context;   @Override   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {     SpringContextUtils.context = applicationContext;   }   public static void autowireBean(Object bean) {     context.getAutowireCapableBeanFactory().autowireBean(bean);   }   public static ApplicationContext getContext() {     return context;   }   public static T getBean(Class clazz) {     return context.getBean(clazz);   }   public static T getBean(String name) {     return (T) context.getBean(name);   } }

启动测试结果为：

总结：

优点：实时读取DB里的脚本，当脚本更改时，可以直接修改DB，对代码无侵入

缺点：每次都要查询DB，反射调用代码写死了

方法二：

1、我们模仿groovy-resource的思路，resource的XML配置是下面这样的

1	<lang:groovy id="helloService" script-source="classpath:groovy/HelloServiceImpl.groovy" />

所以，我们可以把DatabaseScriptSource的XML保存成这种格式

1	<lang:groovy id="helloService" script-source="database:helloService"/>

2、然后模仿Spring保存成XML格式的document的思路，我们也把groovy保存成XML格式的document，放进内存里

3、groovy的关键处理类是ScriptFactoryPostProcessor，当 Spring 装载应用程序上下文时，它首先创建工厂 bean（例如 GroovyScriptFactory bean）。然后，执行ScriptFactoryPostProcessor bean，用实际的脚本对象替换所有的工厂 bean。例如，我们本次测试的配置产生一个名为 helloService 的 bean，它的类型是groovierspring.GroovyHelloService。（如果启用 Spring 中的 debug 级日志记录，并观察应用程序上下文的启动，将会看到 Spring 首先创建一个名为 scriptFactory.helloService 的工厂 bean，然后 ScriptFactoryPostProcessor 从该工厂 bean 创建 helloService bean）。