Springboot中動態(tài)語言groovy介紹
Groovy
Groovy是一種基于Java的語法的基于JVM的編程語言。Groovy支持動態(tài)輸入,閉包,元編程,運算符重載等等語法。除此之外,Groovy還提供了許多類似腳本語言的功能,比如,多行字符串,字符串插值,優(yōu)雅的循環(huán)結(jié)構(gòu)和簡單的屬性訪問。另外,結(jié)尾分號是可選的。而這些都有足夠的理幫助開發(fā)人員為了提高開發(fā)效率。
換句話說,Groovy就是一種繼承了動態(tài)語言的優(yōu)良特性并運行在JVM上的編程語言。由于Groovy的語法非常接近Java,所以Java開發(fā)人員很容易開始使用Groovy。 Spring Boot應(yīng)用中也支持使用Groovy編程語言進行開發(fā)。
- ResourceScriptSource:在 resources 下面寫groovy類
- StaticScriptSource:把groovy類代碼放進XML里
- DatabaseScriptSource:把groovy類代碼放進數(shù)據(jù)庫中
pom
<!-- groovy --> <dependency> <artifactId>groovy</artifactId> <groupId>org.codehaus.groovy</groupId> <version>2.5.8</version> <scope>compile</scope> </dependency>
ResourceScriptSource
@SpringBootApplication public class DemoApplication { public static void main(String[] args) { ConfigurableApplicationContext run = SpringApplication.run(DemoApplication.class, args); ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-groovy.xml"); GroovyService bean = context.getBean(GroovyService.class); String sayHello = bean.sayHello(); System.out.println(sayHello); } }
public interface GroovyService { String sayHello(); }
spring-groovy.xml
<?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.example.demo.groovy.GroovyService class HelloServiceImpl implements GroovyService { 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>
DatabaseScriptSource
方法一:
實時讀取DB里的groovy腳本文件
利用GroovyClassLoader去編譯腳本文件
把class對象注入成Spring bean
反射調(diào)用腳本的方法
CREATE TABLE `groovy_script` ( `id` bigint 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=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='groovy script';
INSERT INTO book_shop2.groovy_script (id, script_name, script_content, status, extend_info, created_time, modified_time) VALUES(1, 'groovyService', 'import com.example.demo.groovy.GroovyService class HelloServiceImpl implements GroovyService { @Override String sayHello() { return "sayHello"; } @Override String sayHello(String name) { return "Hello " + name + ". Welcome to static script in Groovy."; } }', 'ENABLE', NULL, '2020-09-26 17:16:36.477818000', '2022-09-04 22:54:51.421959000');
@RestController public class GroovyController { @Autowired GroovyScriptMapper groovyScriptMapper; @GetMapping("/aaaa") private String groovyTest() throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException { GroovyScript groovyScript = this.groovyScriptMapper.getOne(1L); 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); String aaaaaaa = (String) method.invoke(o, "aaaaaaa"); System.out.println(aaaaaaa); return aaaaaaa; } } /* import com.example.demo.groovy.GroovyService class HelloServiceImpl implements GroovyService { @Override String sayHello() { return "sayHello"; } @Override String sayHello(String name) { return "Hello " + name + ". Welcome to static script in Groovy."; } } Hello aaaaaaa. Welcome to static script in Groovy. */
public interface GroovyScriptMapper extends BaseMapper<GroovyScript> { @Select({"select script_content from groovy_script where id = #{id}"}) @Result(column = "script_content", property = "scriptContent") GroovyScript getOne(Long id); }
@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> T getBean(Class<T> clazz) { return context.getBean(clazz); } public static <T> T getBean(String name) { return (T) context.getBean(name); } }
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