初识Drools（二）： Drools 之 SpringBoot

新启一个SpringBoot项目

---

项目目录如下：

---

加入依赖：

6.3.0.Final

	
		org.springframework
		spring-tx
	
	
		org.springframework
		spring-beans
	
	
		org.springframework
		spring-core
	
	
		org.springframework
		spring-context
	

---

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 chenhao
 * @version 1.0.0
 * @since 1.0.0
 * 

 * 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

---

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;
}

---

编写简单规则：

package rules


import com.example.myDroolsDemo.pojo.Student;
import com.example.myDroolsDemo.fact.StudentResult
/**
 * 规则
 *
 * @author chenhao
 * @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

---

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());

    }
}

---

运行后 访问 http://localhost:8080/test/check 

查看控制台