Spring Boot+Drools规则引擎整合详解

目的

官方的drools范例大都是基于纯java项目或maven项目，而基于spring boot项目的很少。

本文介绍如何在spring boot项目上加上drools规则引擎。

pom依赖

pom文件如下：

<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.galaxyyao</groupid>
 <artifactid>springbootdroolstest1</artifactid>
 <version>1.0.0</version>
 <packaging>jar</packaging>

 <name>springbootdroolstest1</name>
 <url>http://maven.apache.org</url>

 <properties>
  <project.build.sourceencoding>utf-8</project.build.sourceencoding>
  <java.version>1.8</java.version>
 </properties>

 <parent>
  <groupid>org.springframework.boot</groupid>
  <artifactid>spring-boot-starter-parent</artifactid>
  <version>1.5.2.release</version>
 </parent>
 <dependencies>
  <dependency>
   <groupid>org.springframework.boot</groupid>
   <artifactid>spring-boot-starter-web</artifactid>
  </dependency>

  <dependency>
   <groupid>org.drools</groupid>
   <artifactid>drools-core</artifactid>
   <version>7.0.0.final</version>
  </dependency>
  <dependency>
   <groupid>org.drools</groupid>
   <artifactid>drools-compiler</artifactid>
   <version>7.0.0.final</version>
  </dependency>
  <dependency>
   <groupid>org.drools</groupid>
   <artifactid>drools-decisiontables</artifactid>
   <version>7.0.0.final</version>
  </dependency>
  <dependency>
   <groupid>org.drools</groupid>
   <artifactid>drools-templates</artifactid>
   <version>7.0.0.final</version>
  </dependency>

  <dependency>
   <groupid>org.kie</groupid>
   <artifactid>kie-api</artifactid>
   <version>7.0.0.final</version>
  </dependency>
 </dependencies>
 <build>
  <plugins>
   <plugin>
    <artifactid>maven-compiler-plugin</artifactid>
   </plugin>
   <plugin>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-maven-plugin</artifactid>
   </plugin>
   <plugin>
    <groupid>org.codehaus.mojo</groupid>
    <artifactid>exec-maven-plugin</artifactid>
    <configuration>
     <executable>java</executable>
     <arguments>
      <argument>com.galaxyyao.springbootdroolstest1.springbootdroolstest1application</argument>
     </arguments>
    </configuration>
   </plugin>
  </plugins>
 </build>
</project>

其中比较需要注意的是使用了exec-maven-plugin插件，不然无法启动

引用的drools包的版本可以自行调整。

resources

在src/main/resources下添加两个目录：

meta-inf和rules

meta-inf下添加kmodule.xml，内容如下：

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
 <kbase name="rules" packages="rules">
  <ksession name="ksession-rules"/>
 </kbase>
</kmodule>

rules目录下添加一个简单的hello world规则

package com.galaxyyao.springbootdroolstest1
import com.galaxyyao.springbootdroolstest1.domain.message
dialect "mvel"

rule "hello world"
 dialect "mvel"
 when
  m : message(status.equals(message.hello), message : message )
 then
  system.out.println( message);
 modify ( m ) { message = "goodbye cruel world",status = message.goodbye };
end

rule "good bye"
 dialect "java"
 when
  message( status == message.goodbye, message : message )
 then
  system.out.println( message );
end

domain层

domain层定义一个drools中需要使用到的model：

package com.galaxyyao.springbootdroolstest1.domain;

public class message {
 public static final integer hello = 0;
 public static final integer goodbye = 1;

 private string message;

 private integer status;

 public string getmessage() {
  return this.message;
 }

 public void setmessage(string message) {
  this.message = message;
 }

 public integer getstatus() {
  return this.status;
 }

 public void setstatus(integer status) {
  this.status = status;
 }
}

service层

service层负责实际运行规则：

package com.galaxyyao.springbootdroolstest1.service;

import org.kie.api.kieservices;
import org.kie.api.runtime.kiecontainer;
import org.kie.api.runtime.kiesession;
import org.springframework.stereotype.service;

import com.galaxyyao.springbootdroolstest1.domain.message;

@service
public class droolsservice {
 public string firerule() {
 // load up the knowledge base
  kieservices ks = kieservices.factory.get();
  kiecontainer kcontainer = ks.getkieclasspathcontainer();
  kiesession ksession = kcontainer.newkiesession("ksession-rules");

  // go !
  message message = new message();
  message.setmessage("hello world");
  message.setstatus(message.hello);
  ksession.insert(message);//插入
  ksession.fireallrules();//执行规则
  ksession.dispose();
  return message.getmessage();
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。