初识Drools（二）： Drools 之 SpringBoot

逃离我推掉我的手 2022-04-10 06:23 176阅读 0赞

### **新启一个SpringBoot项目** ###

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### **项目目录如下：** ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5oYW9fY19o_size_16_color_FFFFFF_t_70][]

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### **加入依赖：** ###

<version>6.3.0.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>

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### **编写配置：** ###

package com.example.myDroolsDemo.config;
    
    
    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;
    
    /**
     * drools配置文件
     *
     * @author <a href="mailto:chenhao2010h@163.com">chenhao</a>
     * @version 1.0.0
     * @since 1.0.0
     * <p>
     * Created at 2018/12/18
     */
    @Configuration
    public class DroolsAutoConfiguration {
    	private static final String RULES_PATH = "rules/";
    
    	@Bean
    	@ConditionalOnMissingBean(KieFileSystem.class)
    	public KieFileSystem kieFileSystem() throws IOException {
    		KieFileSystem kieFileSystem = getKieServices().newKieFileSystem();
    		for (Resource file : getRuleFiles()) {
    			kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_PATH + file.getFilename(), "UTF-8"));
    		}
    		return kieFileSystem;
    	}
    
    	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(() -> 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();
    	}
    }

其中因为我将drl文件放在了 rules 文件夹下，所以给出了这样的路径，也可以直接放在 resources 文件下修改一下配置中的路径即可

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5oYW9fY19o_size_16_color_FFFFFF_t_70 1][]

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### **编写POJO：** ###

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class Student {
        private String name;
        private Integer age;
        private String address;
        private Integer high;
        private Integer householdIncome;
        private Integer family;
    }

### **编写返回类：** ###

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class StudentResult {
        private int fraction;
        private int worth;
    }

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### **编写简单规则：** ###

package rules
    
    
    import com.example.myDroolsDemo.pojo.Student;
    import com.example.myDroolsDemo.fact.StudentResult
    /**
     * 规则
     *
     * @author <a href="mailto:chenhao2010h@163.com">chenhao</a>
     * @version 1.0.0
     * @since 1.0.0
     *
     * Created at 2018/12/18
     */
    
    rule "checkAge"
        when
            student : Student(age < 20)
            studentResult: StudentResult();
        then
            studentResult.setFraction(1);
    end
    
    rule "checkHigh"
        when
            student : Student(high < 185)
            studentResult : StudentResult();
        then
            studentResult.setFraction(studentResult.getFraction()+1);
    end
    
    rule "checkFamily"
        when
            student : Student(family < 2)
            studentResult : StudentResult();
        then
             studentResult.setFraction(studentResult.getFraction()+1);
        end
    
    rule "final"
        when
            studentResult : StudentResult(fraction>3);
        then
            studentResult.setWorth(100);
    end

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### **编写 Controller 层：** ###

@RequestMapping("/test")
    @Controller
    public class CheckController {
        @Resource
        private KieSession kieSession;
    
        @RequestMapping("/check")
        @ResponseBody
        public void checkTest() {
            Student student = new Student();
            StudentResult sr = new StudentResult();
            student.setAge(10);
            student.setFamily(1);
            student.setHigh(100);
            kieSession.insert(student);
            kieSession.insert(sr);
            int i = kieSession.fireAllRules();
            System.out.println("触发了" + i + "条规则");
    
            System.out.println(sr.getWorth());
    
        }
    }

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运行后 访问 [http://localhost:8080/test/check][http_localhost_8080_test_check]

查看控制台

![20181229105047472.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5oYW9fY19o_size_16_color_FFFFFF_t_70]: /images/20220402/e793a8e6b06847f1b276038b929f6bc7.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5oYW9fY19o_size_16_color_FFFFFF_t_70 1]: /images/20220402/06074ff0bf1044979eeea516483642ea.png
[http_localhost_8080_test_check]: http://localhost:9090/test/check
[20181229105047472.png]: /images/20220402/7b006267adc1462aa5b28d2d2cb2b275.png