第2-4-6章 springboot整合規則引擎Drools-業務規則管理系統-元件化-中臺

假裝文藝範兒發表於2022-11-27

7. Spring整合Drools

7. Spring整合Drools

7.1 Spring簡單整合Drools

在專案中使用Drools時往往會跟Spring整合來使用。具體整合步驟如下：

第一步：建立maven工程drools_spring並配置pom.xml

<?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>
    <groupId>com.itheima</groupId>
    <artifactId>drools_spring</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <drools.version>7.10.0.Final</drools.version>
        <spring.version>5.0.5.RELEASE</spring.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-compiler</artifactId>
            <version>${drools.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-spring</artifactId>
            <version>${drools.version}</version>
            <!--注意：此處必須排除傳遞過來的依賴，否則會跟我們自己匯入的Spring jar包產生衝突-->
            <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.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>
</project>

第二步：建立規則目錄/resources/rules，中rules目錄中建立規則檔案helloworld.drl

package helloworld

rule "rule_helloworld"
    when
        eval(true)
    then
        System.out.println("規則：rule_helloworld觸發...");
end

第三步：建立Spring配置檔案/resources/spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:kie="http://drools.org/schema/kie-spring"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://drools.org/schema/kie-spring
                            http://drools.org/schema/kie-spring.xsd">
    <kie:kmodule id="kmodule">
        <kie:kbase name="kbase" packages="rules">
            <kie:ksession name="ksession"></kie:ksession>
        </kie:kbase>
    </kie:kmodule>
    <bean class="org.kie.spring.annotations.KModuleAnnotationPostProcessor"></bean>
</beans>

第四步：編寫單元測試類

package com.itheima.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.kie.api.KieBase;
import org.kie.api.cdi.KBase;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring.xml")
public class DroolsSpringTest {
    @KBase("kbase")
    private KieBase kieBase;//注入KieBase物件
    @Test
    public void test1(){
        KieSession kieSession = kieBase.newKieSession();
        kieSession.fireAllRules();
        kieSession.dispose();
    }
}

7.1.1 以上程式碼均在drools_spring專案中

在這裡插入圖片描述

7.2 Spring整合Drools+web

本小節我們來進行Drools和Spring Web的整合。具體操作步驟如下：

第一步：建立maven的war工程drools_springweb並在pom.xml檔案中匯入相關maven座標

<?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>
  <groupId>com.itheima</groupId>
  <artifactId>drools_springweb</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <drools.version>7.10.0.Final</drools.version>
    <spring.version>5.0.5.RELEASE</spring.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.drools</groupId>
      <artifactId>drools-compiler</artifactId>
      <version>${drools.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
    </dependency>
    <dependency>
      <groupId>org.kie</groupId>
      <artifactId>kie-spring</artifactId>
      <version>${drools.version}</version>
      <!--注意：此處必須排除傳遞過來的依賴，否則會跟我們自己匯入的Spring jar包產生衝突-->
      <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.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <configuration>
          <!-- 指定埠 -->
          <port>80</port>
          <!-- 請求路徑 -->
          <path>/</path>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

第二步：配置web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 指定載入的配置檔案 ，透過引數contextConfigLocation載入 -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

第三步：建立/resources/springmvc.xml檔案

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:kie="http://drools.org/schema/kie-spring"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://drools.org/schema/kie-spring
       http://drools.org/schema/kie-spring.xsd
       http://www.springframework.org/schema/mvc
	   http://www.springframework.org/schema/mvc/spring-mvc.xsd
	   http://www.springframework.org/schema/context
	   http://www.springframework.org/schema/context/spring-context.xsd">

    <kie:kmodule id="kmodule">
        <kie:kbase name="kbase" packages="rules">
            <kie:ksession name="ksession"></kie:ksession>
        </kie:kbase>
    </kie:kmodule>

    <bean class="org.kie.spring.annotations.KModuleAnnotationPostProcessor"/>

    <!--spring批次掃描-->
    <context:component-scan base-package="com.itheima" />
    <context:annotation-config/>
    <!--springMVC註解驅動-->
    <mvc:annotation-driven/>
</beans>

第四步：建立規則檔案/resources/rules/helloworld.drl

package helloworld

rule "rule_helloworld"
    when
        eval(true)
    then
        System.out.println("規則：rule_helloworld觸發...");
end

第五步：建立RuleService

package com.itheima.service;

import org.kie.api.KieBase;
import org.kie.api.cdi.KBase;
import org.kie.api.runtime.KieSession;
import org.springframework.stereotype.Service;

@Service
public class RuleService {
    @KBase("kbase")
    private KieBase kieBase;
    public void rule(){
        KieSession kieSession = kieBase.newKieSession();
        kieSession.fireAllRules();
        kieSession.dispose();
    }
}

第六步：建立HelloController

package com.itheima.controller;

import com.itheima.service.RuleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/hello")
public class HelloController {
    @Autowired
    private RuleService ruleService;
    @RequestMapping("/rule")
    public String rule(){
        ruleService.rule();
        return "OK";
    }
}

7.2 以上程式碼均在drools_springweb專案中

在這裡插入圖片描述

7.3 Spring Boot整合Drools

目前在企業開發中Spring Boot已經成為主流，本小節我們來進行Spring Boot整合Drools。具體操作步驟：

第一步：建立maven工程drools_springboot並配置pom.xml

<?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">
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starters</artifactId>
        <version>2.0.6.RELEASE</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.itheima</groupId>
    <artifactId>drools_springboot</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>
        <!--drools規則引擎-->
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-core</artifactId>
            <version>7.6.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-compiler</artifactId>
            <version>7.6.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-templates</artifactId>
            <version>7.6.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-api</artifactId>
            <version>7.6.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-spring</artifactId>
            <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>
            <version>7.6.0.Final</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>${project.artifactId}</finalName>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.*</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

第二步：建立/resources/application.yml檔案

server:
  port: 8080
spring:
  application:
    name: drools_springboot

第三步：建立規則檔案/resources/rules/helloworld.drl

package helloworld
rule "rule_helloworld"
    when
        eval(true)
    then
        System.out.println("規則：rule_helloworld觸發...");
end

第四步：編寫配置類DroolsConfig

package com.itheima.drools.config;
import org.kie.api.KieBase;
import org.kie.api.KieServices;
import org.kie.api.builder.KieBuilder;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.KieRepository;
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.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.io.Resource;
import java.io.IOException;
/**
 * 規則引擎配置類
 */
@Configuration
public class DroolsConfig {
    //指定規則檔案存放的目錄
    private static final String RULES_PATH = "rules/";
    private final KieServices kieServices = KieServices.Factory.get();
    @Bean
    @ConditionalOnMissingBean
    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
    @ConditionalOnMissingBean
    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
    @ConditionalOnMissingBean
    public KieBase kieBase() throws IOException {
        return kieContainer().getKieBase();
    }
    @Bean
    @ConditionalOnMissingBean
    public KModuleBeanFactoryPostProcessor kiePostProcessor() {
        return new KModuleBeanFactoryPostProcessor();
    }
}

第五步：建立RuleService類

package com.itheima.drools.service;

import org.kie.api.KieBase;
import org.kie.api.runtime.KieSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class RuleService {
    @Autowired
    private KieBase kieBase;
    public void rule(){
        KieSession kieSession = kieBase.newKieSession();
        kieSession.fireAllRules();
        kieSession.dispose();
    }
}

第六步：建立HelloController類

package com.itheima.drools.controller;

import com.itheima.drools.service.RuleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/hello")
public class HelloController {
    @Autowired
    private RuleService ruleService;
    @RequestMapping("/rule")
    public String rule(){
        ruleService.rule();
        return "OK";
    }
}

第七步：建立啟動類DroolsApplication

package com.itheima.drools;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DroolsApplication {
    public static void main(String[] args) {
        SpringApplication.run(DroolsApplication.class,args);
    }
}

第八步：啟動服務，訪問http://localhost:8080/hello/rule

7.3.1 以上程式碼均在drools_springboot專案中

在這裡插入圖片描述
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