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Drools (一) -简介
Drools (一) -简介
简介
Drools引擎是Drools的规则引擎。Drools引擎存储，处理和评估数据，以执行您定义的业务规则或决策模型。Drools引擎的基本功能是将传入的数据或事实与规则条件相匹配，并确定是否以及如何执行规则
样例
1.新建一个spring boot 项目
2.引入maven库
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>7.34.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>7.34.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-templates</artifactId>
<version>7.34.0.Final</version>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
<version>7.34.0.Final</version>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-spring</artifactId>
<version>7.34.0.Final</version>
</dependency>
3.新建一个配置类如下
import org.kie.api.KieBase;
import org.kie.api.KieServices;
import org.kie.api.builder.KieBuilder;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.KieRepository;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import org.kie.internal.io.ResourceFactory;
import org.kie.spring.KModuleBeanFactoryPostProcessor;
import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.stereotype.Component;
import java.io.IOException;
/**
* @author yudong
* @version 1.0
* @date 2020/3/23 5:37 下午
* @modified By
*/
@Component
@Configurable
public class DroolsConfig {
private final KieServices kieServices = KieServices.Factory.get();
@Bean
public KieFileSystem kieFileSystem() throws IOException {
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
Resource[] files = resourcePatternResolver.getResources("classpath*:*.drl");
for (Resource file : files) {
kieFileSystem.write(ResourceFactory.newClassPathResource(file.getFilename(), "UTF-8"));
}
return kieFileSystem;
}
@Bean
public KieContainer kieContainer( KieFileSystem kieFileSystem) throws IOException {
KieRepository kieRepository = kieServices.getRepository();
kieRepository.addKieModule(kieRepository::getDefaultReleaseId);
KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);
kieBuilder.buildAll();
return kieServices.newKieContainer(kieRepository.getDefaultReleaseId());
}
@Bean
public KieBase kieBase( KieContainer kieContainer) throws IOException {
return kieContainer.getKieBase();
}
@Bean
public KieSession kieSession( KieContainer kieContainer) throws IOException {
return kieContainer.newKieSession();
}
@Bean
public KModuleBeanFactoryPostProcessor kiePostProcessor() {
return new KModuleBeanFactoryPostProcessor();
}
}
4.创建两个实体类 QueryParam 和 RuleResult
/**
* @author yudong
* @version 1.0
* @date 2020/3/23 6:15 下午
* @modified By
*/
public class QueryParam {
private String test;
public String getTest() {
return test;
}
public void setTest(String test) {
this.test = test;
}
}
/**
* @author yudong
* @version 1.0
* @date 2020/3/23 6:16 下午
* @modified By
*/
public class RuleResult {
private Boolean result;
public Boolean getResult() {
return result;
}
public void setResult(Boolean result) {
this.result = result;
}
}
5.在resources资源文件夹下创建test.drl文件,内容如下
package droolRule ;
import com.example.demo.*
dialect "java"
rule "test1"
salience 99
when queryParam : QueryParam(test != null)
resultParam : RuleResult()
then
System.out.println("参数内容:"+queryParam.getTest());
resultParam.setResult(true);
end
6.创建测试Controller
import org.kie.api.runtime.KieSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
/**
* @author yudong
* @version 1.0
* @date 2020/2/11 2:38 下午
* @modified By
*/
@ResponseBody
@Controller
public class TestController {
@Autowired
private KieSession kieSession;
/**
* 运营后台-登录
* @return
* @throws Exception
*/
@PostMapping("/test")
public String test()throws Exception{
QueryParam queryParam = new QueryParam();
queryParam.setTest("11111");
RuleResult ruleResult = new RuleResult();
kieSession.insert(queryParam);
kieSession.insert(ruleResult);
kieSession.fireAllRules();
System.out.println(ruleResult.getResult());
return "";
}
}
7.测试结果如下输出
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.9.RELEASE)
2020-03-24 18:15:16.966 INFO 21984 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication on yudongdeMacBook-Pro.local with PID 21984 (/Users/yudong/Documents/Erdos/demo/target/classes started by yudong in /Users/yudong/Documents/Erdos/demo)
2020-03-24 18:15:16.971 INFO 21984 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2020-03-24 18:15:18.088 INFO 21984 --- [ main] o.k.s.KModuleBeanFactoryPostProcessor : :: BeanFactoryPostProcessor::postProcessBeanFactory called ::
2020-03-24 18:15:18.098 WARN 21984 --- [ main] o.d.c.k.b.impl.ClasspathKieProject : Unable to find pom.properties in /Users/yudong/Documents/Erdos/demo/target/classes/com/example/demo
2020-03-24 18:15:18.193 INFO 21984 --- [ main] o.d.c.k.b.impl.ClasspathKieProject : Recursed up folders, found and used pom.xml /Users/yudong/Documents/Erdos/demo/pom.xml
2020-03-24 18:15:18.195 INFO 21984 --- [ main] o.k.s.KModuleBeanFactoryPostProcessor : Found project with releaseId: com.example:demo:0.0.1-SNAPSHOT
2020-03-24 18:15:20.204 WARN 21984 --- [ main] io.undertow.websockets.jsr : UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
2020-03-24 18:15:20.275 INFO 21984 --- [ main] io.undertow.servlet : Initializing Spring embedded WebApplicationContext
2020-03-24 18:15:20.275 INFO 21984 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3238 ms
2020-03-24 18:15:21.411 WARN 21984 --- [ main] o.d.c.kie.builder.impl.KieBuilderImpl : File 'test.drl' is in folder '' but declares package 'droolRule'. It is advised to have a correspondance between package and folder names.
2020-03-24 18:15:23.238 INFO 21984 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-03-24 18:15:23.615 INFO 21984 --- [ main] com.example.demo.BodyReaderFilter : filter init
2020-03-24 18:15:23.628 INFO 21984 --- [ main] org.xnio : XNIO version 3.3.8.Final
2020-03-24 18:15:23.646 INFO 21984 --- [ main] org.xnio.nio : XNIO NIO Implementation Version 3.3.8.Final
2020-03-24 18:15:23.788 INFO 21984 --- [ main] o.s.b.w.e.u.UndertowServletWebServer : Undertow started on port(s) 8080 (http) with context path ''
2020-03-24 18:15:23.795 INFO 21984 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 7.442 seconds (JVM running for 9.421)
2020-03-24 18:16:14.257 INFO 21984 --- [ XNIO-1 task-1] io.undertow.servlet : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-03-24 18:16:14.257 INFO 21984 --- [ XNIO-1 task-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-03-24 18:16:14.274 INFO 21984 --- [ XNIO-1 task-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 17 ms
参数内容:11111
true