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要在Spring Boot项目中集成Drools,你需要遵循以下步骤:
- 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>${drools.version}</version> </dependency> </dependencies>
将${drools.version}
替换为你想使用的Drools版本,例如7.60.0.Final
。
- 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()); } }
- 编写规则文件
在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
- 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(); } }
- 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。