1、创建Springboot项目

2、添加pom其他依赖

<dependency>
    <groupId>org.kie</groupId>
    <artifactId>kie-spring</artifactId>
    <version>7.11.0.Final</version>
    <exclusions>
        <exclusion>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.drools</groupId>
    <artifactId>drools-compiler</artifactId>
    <version>7.11.0.Final</version>
</dependency>

3、创建实体类

@Data
public class Address {
    private String postCode;
    private String street;
    private String state;
}

@Data
public class AddressCheckResult {
    //true通过校验，false 未通过
    private boolean postCodeResult = false;
}

4、配置类

import org.kie.api.KieBase;
import org.kie.api.KieServices;
import org.kie.api.builder.*;
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.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.IOException;

@Configuration
public class DroolsAutoConfiguration {

    //rule的存放位置
    private static final String RULES_PATH = "rules/";

    @Bean
    @ConditionalOnMissingBean(KieFileSystem.class)
    public KieFileSystem kieFileSystem() throws IOException {
        KieFileSystem kieFileSystem = getKieServices().newKieFileSystem();
        for (Resource file : getRuleFiles()) {
            String path = RULES_PATH + file.getFilename();
            kieFileSystem.write(ResourceFactory.newClassPathResource(path, "UTF-8"));
        }
        return kieFileSystem;
    }

    /**
     * 这里要引入 org.springframework.core.io.Resource  包
     *
     * @return
     * @throws IOException
     */
    private Resource[] getRuleFiles() throws IOException {
        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        return resourcePatternResolver.getResources("classpath*:" + RULES_PATH + "**/*.*");
    }

    @Bean
    @ConditionalOnMissingBean(KieContainer.class)
    public KieContainer kieContainer() throws IOException {
        final KieRepository kieRepository = getKieServices().getRepository();

        kieRepository.addKieModule(new KieModule() {
            public ReleaseId getReleaseId() {
                return kieRepository.getDefaultReleaseId();
            }
        });

        KieBuilder kieBuilder = getKieServices().newKieBuilder(kieFileSystem());
        kieBuilder.buildAll();

        return getKieServices().newKieContainer(kieRepository.getDefaultReleaseId());
    }

    private KieServices getKieServices() {
        return KieServices.Factory.get();
    }

    @Bean
    @ConditionalOnMissingBean(KieBase.class)
    public KieBase kieBase() throws IOException {
        return kieContainer().getKieBase();
    }

    @Bean
    @ConditionalOnMissingBean(KieSession.class)
    public KieSession kieSession() throws IOException {
        return kieContainer().newKieSession();
    }

    @Bean
    @ConditionalOnMissingBean(KModuleBeanFactoryPostProcessor.class)
    public KModuleBeanFactoryPostProcessor kiePostProcessor() {
        return new KModuleBeanFactoryPostProcessor();
    }
}

5、创建drools特有的xml

<?xml version="1.0" encoding="UTF-8" ?>
<kmodule xmlns="http://www.drools.org/xsd/kmodule">
    <kbase name="rules" packages="mujiutian.rules">
        <ksession name="ksession-rule"/>
    </kbase>
</kmodule>

      这个packages 要和下面的规则文件对应的名字一致，不然会报错。

6、编写drools规则

package mujiutian.rules;

import com.mjt.drools.entity.Address;
import com.mjt.drools.entity.AddressCheckResult;


rule "Rules"
    when
        adress : Address(postCode != null,postCode matches "([0-9]{5})")
        checkResult: AddressCheckResult();
    then
        checkResult.setPostCodeResult(true);
        System.out.println("规则中打印日志：校验通过");
end

      这个package默认生成是static，要修改一些，不然会报错，同时要和上面xml中的内容一样才行，rule 后面加的"" 是描述内容，可以写任何内容。

7、编写controller层

import org.kie.api.runtime.KieSession;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping(value = "/drools")
public class DroolsController {

    @Resource
    KieSession kieSession;

    @GetMapping(value = "/address")
    public void test1(){
        Address address = new Address();
        address.setPostCode("99425");

        AddressCheckResult result = new AddressCheckResult();
        kieSession.insert(address);
        kieSession.insert(result);
        int ruleFiredCount = kieSession.fireAllRules();
        System.out.println("触发了"+ruleFiredCount+"条规则");

        if (result.isPostCodeResult()){
            System.out.println("规则校验通过");
        }
    }
}

8、运行测试

      借鉴于：https://blog.csdn.net/qq_21383435/article/details/82873711  基本完全复制的代码，如果可以也可以进入他的博客专栏,感谢！

      ok～