Drools各种实例

Drools规则引擎就是根据规则判断和筛选出符合规则的数据。

这哥们讲的很生动，而且看了一下他的git写的很不错（收藏了）
https://www.cnblogs.com/ityouknow/archive/2017/08/07/7297524.html
在使用drools时会涉及到规则语法
https://blog.csdn.net/u012373815/article/details/53872025/
drools底层算法rate（看了一下大概是官方文档的中文版）
https://blog.csdn.net/u012373815/article/details/53869097
入门demo
需求：根据用户购买商品的价格为用户添加额外的积分

先在resource目录下创建META-INF目录
添加kmodule.xml文件

先在resource目录下创建rules目录
添加Point-rules.drl文件

如下：

3.png

然后开始写代码

  
            org.springframework.boot
            spring-boot-devtools
            true
        

public class Order {
      
    private Date bookingDate;//下单日期
      
    private int amout;//订单原价金额  
      
    private User user;//下单人  
      
    private int score;  
      
    public int getScore() {  
        return score;  
    }  
  
    public void setScore(int score) {  
        this.score = score;  
    }  
  
    public Date getBookingDate() {  
        return bookingDate;  
    }  
  
    public void setBookingDate(Date bookingDate) {  
        this.bookingDate = bookingDate;  
    }  
  
    public int getAmout() {  
        return amout;  
    }  
  
    public void setAmout(int amout) {  
        this.amout = amout;  
    }  
  
    public User getUser() {  
        return user;  
    }  
  
    public void setUser(User user) {  
        this.user = user;  
    }  
      
    
}  

public class User {
      
    private String name;//姓名  
      
    private int level;//用户级别  
  
    public String getName() {  
        return name;  
    }  
  
    public void setName(String name) {  
        this.name = name;  
    }  
  
    public int getLevel() {  
        return level;  
    }  
  
    public void setLevel(int level) {  
        this.level = level;  
    }  
      
      
      
}  

import org.kie.api.KieServices;
import org.kie.api.event.rule.DebugAgendaEventListener;
import org.kie.api.event.rule.DebugRuleRuntimeEventListener;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;

import java.util.ArrayList;
import java.util.List;

/**
 * This is a sample file to launch a rule package from a rule source file.
 */
public class HelloWorldExample {

    public static final void main(final String[] args) {
        // KieServices is the factory for all KIE services 
        KieServices ks = KieServices.Factory.get();
        
        // From the kie services, a container is created from the classpath
        KieContainer kc = ks.getKieClasspathContainer();

        execute( kc );
    }

    public static void execute( KieContainer kc ) {
        // From the container, a session is created based on
        // its definition and configuration in the META-INF/kmodule.xml file
        KieSession ksession = kc.newKieSession("HelloWorldKS");

        // Once the session is created, the application can interact with it
        // In this case it is setting a global as defined in the
        // org/drools/examples/helloworld/HelloWorld.drl file
        ksession.setGlobal( "list",
                            new ArrayList