本文主要是介绍[bigdata-094] drools+eclipse+maven开发一个drools的应用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1. 此例子跟前述例子相似，但不需要在eclipse安装drools插件
2. 目录结构
├── pom.xml
├── src
│ ├── main
│ │ ├── java
│ │ │ └── com
│ │ │ └── ttz
│ │ │ └── demo
│ │ │ └── droolsdemo
│ │ │ ├── App.java
│ │ │ └── Message.java
│ │ └── resources
│ │ ├── META-INF
│ │ │ ├── kmodule.xml
│ │ │ └── maven
│ │ │ └── pom.properties
│ │ └── rules
│ │ ├── Sample2.drl
│ │ └── Sample.drl
3. pom.xml
<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.ttz.demo</groupId><artifactId>droolsdemo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>droolsdemo</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><runtime.version>6.4.0.Final</runtime.version></properties><repositories><repository><id>jboss-public-repository-group</id><name>JBoss Public Repository Group</name><url>http://repository.jboss.org/nexus/content/groups/public/</url><releases><enabled>true</enabled><updatePolicy>never</updatePolicy></releases><snapshots><enabled>true</enabled><updatePolicy>daily</updatePolicy></snapshots></repository></repositories><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><dependency><groupId>org.kie</groupId><artifactId>kie-api</artifactId><version>${runtime.version}</version></dependency><dependency><groupId>org.drools</groupId><artifactId>drools-core</artifactId><version>${runtime.version}</version></dependency><dependency><groupId>org.drools</groupId><artifactId>drools-decisiontables</artifactId><version>${runtime.version}</version></dependency><dependency><groupId>org.jbpm</groupId><artifactId>jbpm-test</artifactId><version>${runtime.version}</version></dependency><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-core</artifactId><version>0.9.29</version></dependency><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>0.9.29</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.6.1</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>log4j-over-slf4j</artifactId><version>1.6.1</version></dependency></dependencies>
</project>
4. App.java
package com.ttz.demo.droolsdemo;import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;import com.ttz.demo.droolsdemo.Message;public class App
{public static void main( String[] args ){//KieServices是一个单实例，它为其他Services提供一个hub式的接口KieServices ks = KieServices.Factory.get();//1. KieBase: 定义了规则引擎的所有知识knowledge。它包括规则，过程，函数，类型等。不包含运行时数据。//2. KieModule: KieModule是一个容器，它定义一组KieBase需要的所有资源。//kmoudle.xml就像pom.xml一样，它可以指定KBase的name，能创建的KieSession,以及其他所需要的资源。 //3. KieContainer:指定了KieModule之后，KieContainer就这个KieModule里的所有KieBase的容器KieContainer kContainer = ks.getKieClasspathContainer();//KieSession：用户和规则引擎的交互方式，可以多次对话，保留对话过程信息，可以多次推理。KieSession kSession = kContainer.newKieSession("ksession-rules");Message message = new Message();message.setMessage("Hello World 2");message.setStatus(Message.HELLO);kSession.insert(message);kSession.fireAllRules();//释放资源，可能有gckSession.dispose();}
}
5.Message.java
package com.ttz.demo.droolsdemo;public class Message {public static final int HELLO = 0;public static final int GOODBYE = 1;private String message;private int status;public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public int getStatus() {return status;}public void setStatus(int status) {this.status = status;}}
6.kmodule.xml
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"><kbase name="rules" packages="rules"><ksession name="ksession-rules"/></kbase>
</kmodule>
7. pom.properites
groupId=com.ttz.demo
artifactId=droolsdemo
version=1.0.0-SNAPSHOT
8.Sample.drl
package com.ttz.demoimport com.ttz.demo.droolsdemo.Message;rule "Hello World"whenm : Message( status == Message.HELLO, myMessage : message )then//System.out.println( myMessage );//m.setMessage( "THis is my hello world" );//m.setStatus( Message.GOODBYE );//update( m );System.out.print("hello wrold\n");
endrule "GoodBye"whenMessage( status == Message.GOODBYE, myMessage : message )thenSystem.out.println( myMessage );
end
9. Sample2.drl
package com.ttz.demoimport com.ttz.demo.droolsdemo.Message;rule "Hello World 2"whenm : Message( status == Message.HELLO, myMessage : message )thenSystem.out.println("hello world 2\n");//System.out.println( myMessage );//m.setMessage( "THis is my hello world 2" );//m.setStatus( Message.GOODBYE );//update( m );
endrule "GoodBye 2"whenMessage( status == Message.GOODBYE, myMessage : message )thenSystem.out.println( myMessage );
end
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