springboot中使用groovy的示例代码

目录

• Groovy
• pom
• ResourceScriptSource
• DatabaseScriptSource

Groovy

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。

• 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

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：
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);

}
}