Drools插件安装、规则语言实例、域语言实例

Drools官网：http://www.jboss.org/drools/documentation.html

 

 

1、Myeclipse6.5下安装Drools插件

 

在线安装地址：http://download.eclipse.org/tools/gef/updates/releases/

 

 

 

安装后重启eclipse，会看到eclipse的工具条上多了一个人头按钮

 

这就说明插件已经安装成功！

 

 

2、规则语言实例

 

 

 -->新建rule project

 

 

 

-->finish，下面是建好的工程目录树，里面的DroolsTest.java和sample.drl都是插件自己生成的

 

 下面我们自己写的东西：

 

代码：

UserVO.java:

package com.drools.demo;
/**
 * 类：用户
 * @author lisanlai
 *
 */
public class UserVO {
	
	/** 姓名 */
	private String name;
	/** 年龄 */
	private int age;
	/** 性别 */
	private String sex;
	/** 体重 */
	private float weight;
	/** 身高 */
	private float height;
	
	public UserVO() {
		super();
	}

	public UserVO(String name, int age, String sex, float weight, float height) {
		super();
		this.name = name;
		this.age = age;
		this.sex = sex;
		this.weight = weight;
		this.height = height;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public float getWeight() {
		return weight;
	}

	public void setWeight(float weight) {
		this.weight = weight;
	}

	public float getHeight() {
		return height;
	}

	public void setHeight(float height) {
		this.height = height;
	}
	
}

 

 

UserTest.java：

package com.drools.demo;

import java.io.InputStreamReader;
import java.io.Reader;

import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;

public class UserTest {

    public static final void main(String[] args) {
        try {
        	
            RuleBase ruleBase = readRule();
            WorkingMemory workingMemory = ruleBase.newStatefulSession();
            
            UserVO user = new UserVO("张三",10,"男",(float)90.6,(float)140.8);
            UserVO user1 = new UserVO("李四",40,"男",(float)130.2,(float)180);
            UserVO user2 = new UserVO("西施",8,"女",(float)50,(float)130);
            UserVO user3 = new UserVO("貂蝉",24,"女",(float)80,(float)175);
            workingMemory.insert( user );
            workingMemory.insert( user1 );
            workingMemory.insert( user2 );
            workingMemory.insert( user3 );
            
            workingMemory.fireAllRules();  
            
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

	private static RuleBase readRule() throws Exception {
		Reader source = new InputStreamReader( UserTest.class.getResourceAsStream( "/UserTest.drl" ) );
		PackageBuilder builder = new PackageBuilder();

		builder.addPackageFromDrl( source );

		Package pkg = builder.getPackage();
		
		RuleBase ruleBase = RuleBaseFactory.newRuleBase();
		ruleBase.addPackage( pkg );
		return ruleBase;
	}
}

 

 

UserTest.drl:
 

#created by lisanlai
package com.demo
 
import com.drools.demo.UserVO

#自己定义的方法
function void sayHello(UserVO user,String str) {
	System.out.println(user.getName()+" "+str+",你好！");
}

function void printUserInfo(UserVO user) {
	System.out.println("个人信息:");
	System.out.println("姓名： "+user.getName());
	System.out.println("年龄： "+user.getAge());
	System.out.println("性别： "+user.getSex());
	System.out.println("体重： "+user.getWeight());
	System.out.println("身高： "+user.getHeight());
	System.out.println("============================================");
}
 
rule "say hello to boy"
	when
		user : UserVO( sex=="男",age<18 )
	then
		sayHello(user,"小帅哥");
		printUserInfo(user);
end

rule "say hello to man"
	when
		user : UserVO( sex=="男",age>18 )
	then
		sayHello(user,"先生");
		printUserInfo(user);
end

rule "say hello to girl"
	when
		user : UserVO( sex=="女",age<18)
	then
		sayHello(user,"小美女");
		printUserInfo(user);
end

rule "say hello to woman"
	when
		user : UserVO( sex=="女",age>18 )
	then
		sayHello(user,"小姐");
		printUserInfo(user);
end

 

 看看运行UserTest.java的效果：

 

 

3、域语言实例

 

下面我们把上面的实例换成用域语言来写

 

-->在src/main/rules下面新建UserTest.dsl文件

 

 

--->再新建UserTest.dslr文件：

 

 

 

代码：

DSLUserTest.java：

package com.drools.demo;

import java.io.InputStreamReader;
import java.io.Reader;

import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;

public class DSLUserTest {

    public static final void main(String[] args) {
        try {
        	
            RuleBase ruleBase = readRule();
            WorkingMemory workingMemory = ruleBase.newStatefulSession();
            
            UserVO user = new UserVO("张三",10,"男",(float)90.6,(float)140.8);
            UserVO user1 = new UserVO("李四",40,"男",(float)130.2,(float)180);
            UserVO user2 = new UserVO("西施",8,"女",(float)50,(float)130);
            UserVO user3 = new UserVO("貂蝉",24,"女",(float)80,(float)175);
            workingMemory.insert( user );
            workingMemory.insert( user1 );
            workingMemory.insert( user2 );
            workingMemory.insert( user3 );
            
            workingMemory.fireAllRules();  
            
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

	private static RuleBase readRule() throws Exception {
		Reader source = new InputStreamReader( DSLUserTest.class.getResourceAsStream( "/UserTest.dslr" ) );
		
		Reader dsl = new InputStreamReader(DSLUserTest.class.getResourceAsStream("/UserTest.dsl"));
		
		PackageBuilder builder = new PackageBuilder();

		builder.addPackageFromDrl( source,dsl );

		Package pkg = builder.getPackage();
		
		RuleBase ruleBase = RuleBaseFactory.newRuleBase();
		ruleBase.addPackage( pkg );
		return ruleBase;
	}
}

 

 

UserTest.dsl：

[condition][]有一个用户=user:UserVO()
[condition][]-性别是"{sex}"=sex=="{sex}"
[condition][]-年龄大于{age}=age>{age}
[condition][]-年龄小于{age}=age<{age}
[consequence][]对"{str}"说你好=sayHello(user,"{str}");
[consequence][]打印个人信息=printUserInfo(user);

 

 

UserTest.dslr:

#created on: Sep 2, 2010
package com.drools.demo

#list any import classes here.
expander UserTest.dsl

#自己定义的方法
function void sayHello(UserVO user,String str) {
	System.out.println(user.getName()+" "+str+",你好！");
}

function void printUserInfo(UserVO user) {
	System.out.println("个人信息:");
	System.out.println("姓名： "+user.getName());
	System.out.println("年龄： "+user.getAge());
	System.out.println("性别： "+user.getSex());
	System.out.println("体重： "+user.getWeight());
	System.out.println("身高： "+user.getHeight());
	System.out.println("============================================");
}

#declare any global variables here

rule "say hello to boy"
	when
		有一个用户
		-性别是"男"
		-年龄小于18
	then
		对"小帅哥"说你好
		打印个人信息
end

rule "say hello to man"
	when
		有一个用户
		-性别是"男"
		-年龄小于18
	then
		对"小帅哥"说你好
		打印个人信息
end

rule "say hello to girl"
	when
		有一个用户
		-性别是"男"
		-年龄小于18
	then
		对"小帅哥"说你好
		打印个人信息
end

rule "say hello to woman"
	when
		有一个用户
		-性别是"男"
		-年龄小于18
	then
		对"小帅哥"说你好
		打印个人信息
end

 

 

运行DSLUserTest.java效果：

 

跟上面用规则语言的效果一样。

 

 

评论

2 楼 山脚下的农民 2011-03-01  

很不错，感谢楼主分享，不多见的完整例子。

1 楼 blueram 2010-09-02  

这个东西在那些地方可以用到呀