Groovy是一种基于Java的语法的基于JVM的编程语言。Groovy支持动态输入，闭包，元编程，运算符重载等等语法。除此之外，Groovy还提供了许多类似脚本语言的功能，比如，多行字符串，字符串插值，优雅的循环结构和简单的属性访问。另外，结尾分号是可选的。而这些都有足够的理帮助开发人员为了提高开发效率。
换句话说，Groovy就是一种继承了动态语言的优良特性并运行在JVM上的编程语言。由于Groovy的语法非常接近Java，所以Java开发人员很容易开始使用Groovy。 Spring Boot应用中也支持使用Groovy编程语言进行开发。
<!-- groovy -->
<dependency>
<artifactId>groovy</artifactId>
<groupId>org.codehaus.groovy</groupId>
<version>2.5.8</version>
<scope>compile</scope>
</dependency>
@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>
方法一：
实时读取DB里的groovy脚本文件
利用GroovyClassLoader去编译脚本文件
把class对象注入成Spring bean
反射调用脚本的方法
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);
}
}
