Springboot + Drools入门

短命女 2022-01-27 17:41 285阅读 0赞

### 文章目录 ###

*  0.搭建项目流程图
 *  1.项目结构
 *  2.pom.xml文件
 *  3.配置类
 *  4.实体类
 *  5.控制器层
 *  6.规则文件
 *   *   *  该项目代码下载地址：

> 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 #

![在这里插入图片描述][20190529231017751.png]

# 1.项目结构 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW5kaXh1YW53dWxpYW5n_size_16_color_FFFFFF_t_70]

# 2.pom.xml文件 #

<?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/> 
        </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/download/tiandixuanwuliang/11215152][https_download.csdn.net_download_tiandixuanwuliang_11215152]

（ps：这个csdn的积分取消不掉，后期我会在github上做一个开源项目。包括Drools小Demo，同时也准备做一个界面拖拽生成规则的开源项目。欢迎大家关注，谢谢）

> 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

[20190529231017751.png]: /images/20220126/329b7cbc855447a794f1f74d5e2525db.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RpYW5kaXh1YW53dWxpYW5n_size_16_color_FFFFFF_t_70]: /images/20220126/77def762be2d49eab0c5861cb0a2287f.png
[https_download.csdn.net_download_tiandixuanwuliang_11215152]: https://download.csdn.net/download/tiandixuanwuliang/11215152