如何用Spring Boot集成Drools

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猴君
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要在Spring Boot项目中集成Drools,你需要遵循以下步骤:

  1. 添加依赖

在你的pom.xml文件中,添加以下依赖:

    <!-- Spring Boot Starters -->    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter</artifactId>     </dependency>      <!-- Drools Dependencies -->    <dependency>        <groupId>org.drools</groupId>        <artifactId>drools-compiler</artifactId>        <version>${drools.version}</version>     </dependency>    <dependency>        <groupId>org.drools</groupId>        <artifactId>drools-decisiontables</artifactId>        <version>${drools.version}</version>     </dependency>    <dependency>        <groupId>org.kie</groupId>        <artifactId>kie-api</artifactId>        <version>${drools.version}</version>     </dependency>    <dependency>        <groupId>org.kie</groupId>        <artifactId>kie-internal</artifactId>        <version>${drools.version}</version>     </dependency>    <dependency>        <groupId>org.kie.modules</groupId>        <artifactId>org-drools-module</artifactId>        <version>${drools.version}</version>     </dependency> </dependencies> 

${drools.version}替换为你想使用的Drools版本,例如7.60.0.Final

  1. 创建KieContainer

创建一个配置类,用于初始化KieContainer。这个类将负责加载和管理你的Drools规则。

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.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;  @Configuration public class DroolsConfig {      @Bean     public KieContainer kieContainer() {         KieServices kieServices = KieServices.Factory.get();         KieRepository kieRepository = kieServices.getRepository();         KieFileSystem kieFileSystem = kieServices.newKieFileSystem();          // 从类路径加载规则文件         kieFileSystem.write(kieServices.getResources().newClassPathResource("rules/sample-rule.drl"));          KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);         kieBuilder.buildAll();          return kieServices.newKieContainer(kieRepository.getDefaultReleaseId());     } } 
  1. 编写规则文件

resources/rules目录下创建一个名为sample-rule.drl的文件,并编写你的Drools规则。例如:

package com.example.drools  import com.example.domain.Person;  rule "Check if person is adult" when     $person: Person(age >= 18) then     System.out.println("Person is an adult."); end 
  1. 使用KieContainer

现在你可以在你的应用程序中使用KieContainer来执行Drools规则。例如,你可以创建一个服务类来处理规则执行:

import org.kie.api.runtime.KieContainer; import org.kie.api.runtime.KieSession; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;  @Service public class DroolsService {      @Autowired     private KieContainer kieContainer;      public void executeRules(Object... facts) {         KieSession kieSession = kieContainer.newKieSession();         for (Object fact : facts) {             kieSession.insert(fact);         }         kieSession.fireAllRules();         kieSession.dispose();     } } 
  1. 调用服务类

最后,你可以在你的控制器或其他类中调用DroolsService来执行规则。例如:

import com.example.domain.Person; import com.example.service.DroolsService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController;  @RestController public class SampleController {      @Autowired     private DroolsService droolsService;      @GetMapping("/check-adult")     public String checkAdult() {         Person person = new Person();         person.setAge(20);         droolsService.executeRules(person);         return "Checked if person is adult.";     } } 

现在,当你访问/check-adult端点时,Drools将根据sample-rule.drl中定义的规则检查Person对象是否是成年人。

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