Springboot + Drools入门

这段时间需要用到“ ** 规则引擎 ** ”，在对比了很多开源工具后，选择了Drools。目前正在进行入门学习，感觉drools的使用还是非常方便的。
对于drools的优点、作用和具体的使用教程还请自行查阅资料，这里仅仅使用使用springboot+drools搭建一个小demo.

0.搭建项目流程图

1.项目结构

Springboot + Drools入门

2.pom.xml文件

关于pom.xml中的build部分，我个人习惯这么写，我所有项目都是这么写

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wllfengshu</groupId>
    <artifactId>drools</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>drools</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <drools.version>7.11.0.Final</drools.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-api</artifactId>
            <version>${drools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-spring</artifactId>
            <version>${drools.version}</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>${drools.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <useUniqueVersions>false</useUniqueVersions>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>com.wllfengshu.drools.DroolsApplication</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

3.配置类

这里稍微做了优化


package com.wllfengshu.drools.configs;

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.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;

/**
 * @author wangll
 */
@Configuration
public class DroolsConfig {

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

    /**
     * 获取到的KieServices其实是一个单例
     */
    private final KieServices kieServices = KieServices.Factory.get();

    @Bean
    public KieFileSystem kieFileSystem() throws IOException {
        KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        Resource[] files = resourcePatternResolver.getResources("classpath*:" + RULES_PATH + "**/*.*");
        String path = null;
        for (Resource file : files) {
            path = RULES_PATH + file.getFilename();
            kieFileSystem.write(ResourceFactory.newClassPathResource(path, "UTF-8"));
        }
        return kieFileSystem;
    }

    @Bean
    public KieContainer kieContainer() throws IOException {
        KieRepository kieRepository = kieServices.getRepository();
        kieRepository.addKieModule(kieRepository::getDefaultReleaseId);
        KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem());
        kieBuilder.buildAll();
        return kieServices.newKieContainer(kieRepository.getDefaultReleaseId());
    }

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

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

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

4.实体类

package com.wllfengshu.drools.model;

import lombok.Data;

/**
 * @author wangll
 */
@Data
public class Address {

    private String postcode;
    private String street;
    private String state;
}

5.控制器层

package com.wllfengshu.drools.rest;

import com.wllfengshu.drools.model.Address;
import org.kie.api.runtime.KieSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

/**
 * @author wangll
 */
@RestController
@RequestMapping("/test")
public class TestController {

    @Autowired
    private KieSession kieSession;

    @ResponseBody
    @RequestMapping(value = "/address/{postCode}",method = RequestMethod.GET)
    public void test(@PathVariable(value = "postCode") String postCode){
        // 以下的数据可以从数据库来，这里写死了
        Address address = new Address();
        address.setPostcode(postCode);
        // 使用规则引擎
        kieSession.insert(address);
        int ruleFiredCount = kieSession.fireAllRules();
        System.out.println("触发了" + ruleFiredCount + "条规则");
        System.out.println("---------------------------------");
    }

}

6.规则文件

这个规则是检查“地址”中“邮编”是否是5个字符以内的数字

package com.rules

import com.wllfengshu.drools.model.Address;

rule "Postcode should be filled with exactly 5 numbers"
    when
        $address : Address(postcode != null, postcode matches "([0-9]{5})")
    then
        System.out.println("规则中打印日志：校验通过!");
end

该项目代码下载地址：

https://download.csdn.net/upload/success

参考：https://blog.csdn.net/qq_21383435/article/details/82873711
在上述参考文献中做了如下修改：
1、去掉了spring-boot-autoconfigure依赖
2、去掉了kmodule.xml配置文件
3、修改controller层中的Resource为Autowired注解
4、优化部分代码