1. 文档来源
从drools官方demo改编而来
2. eclipse要先安装drools的第三方开发工具
3. 用eclipse-->new-->project..->drools--> drools project创建一个新的空项目
3. 源码目录结构
├── pom.xml ├── src │ └── main │ ├── java │ │ └── com │ │ └── ttz │ │ └── demo │ │ ├── Main.java │ │ └── Message.java │ └── resources │ ├── dtables │ ├── META-INF │ │ ├── kmodule.xml │ │ └── maven │ │ └── pom.properties │ ├── process │ └── rules │ ├── Sample2.drl │ └── Sample.drl
4. pom.xml内容如下
<?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.ttz</groupId> <artifactId>mydroolsexample</artifactId> <version>1.0.0-SNAPSHOT</version> <name>Drools :: Sample Maven Project</name> <description>A sample Drools Maven project</description> <properties> <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>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> </dependencies> </project> 5. Main.jav内容如下： package com.ttz.demo; import org.kie.api.KieServices; import org.kie.api.runtime.KieContainer; import org.kie.api.runtime.KieSession; import com.ttz.demo.Message; public class Main { public static void main(String[] args) { KieServices ks = KieServices.Factory.get(); KieContainer kContainer = ks.getKieClasspathContainer(); KieSession kSession = kContainer.newKieSession("ksession-rules"); Message message = new Message(); message.setMessage("Hello World 2"); message.setStatus(Message.HELLO); kSession.insert(message); kSession.fireAllRules(); } } 6. Message.java内容如下 package com.ttz.demo; 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; } } 7. Sample.drl文件内容如下 package com.ttz.demo import com.ttz.demo.Message; rule "Hello World" when m : 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"); end rule "GoodBye" when Message( status == Message.GOODBYE, myMessage : message ) then System.out.println( myMessage ); end 8. Sample2.drl文件内容如下 package com.ttz.demo import com.ttz.demo.Message; rule "Hello World 2" when m : Message( status == Message.HELLO, myMessage : message ) then System.out.println("hello world 2\n"); //System.out.println( myMessage ); //m.setMessage( "THis is my hello world 2" ); //m.setStatus( Message.GOODBYE ); //update( m ); end rule "GoodBye 2" when Message( status == Message.GOODBYE, myMessage : message ) then System.out.println( myMessage ); end9. 其他文件都是自动生成的，不需要修改。
10. 运行，则输出结果是
hello wrold hello world 2表明对同一个Fact，两条规则都生效了。同理，其实也可以设置更多的Fact，更多的规则。
