Drools中salience大的规则会先执行

规则文件 package test import com.blackfish.demo.drools.Stu; rule "rule1" salience 2 when $stu:Stu(age > 30) then System.out.println("age>30岁的人： " + $stu.getName()); $stu.setAmount(30000); end rule "rule2" salience 1 when $stu:Stu(gender=="male", age> 25) then System.out.println("性别为男，age>25的人： " + $stu.getName()); $stu.setAmount(8000); end rule "rule3" salience 3 when $stu:Stu(getName() == "张三") then System.out.println("名字为：" + $stu.getName()); $stu.setAmount(15000); end rule "rule4" salience 4 when $stu:Stu(getName() == "张三", gender == "male") then System.out.println("性别为男，名字为：" + $stu.getName()); $stu.setAmount(20000); end

测试case

public class Test { public static void main(String[] args) { KnowledgeBuilder kb = new KnowledgeBuilderFactory().newKnowledgeBuilder(); kb.add(new ClassPathResource("test.drl"), ResourceType.DRL); Collection<KnowledgePackage> collection = kb.getKnowledgePackages(); KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase(); knowledgeBase.addKnowledgePackages(collection); StatefulKnowledgeSession statefulSession = knowledgeBase.newStatefulKnowledgeSession(); List<Stu> list = getStus(); for(Stu stu : list) { statefulSession.insert(stu); } statefulSession.fireAllRules(); statefulSession.dispose(); System.out.println("End ..."); for(Stu stu : list) { System.out.println(stu.toString()); } } public static List<Stu> getStus() { List<Stu> stus = new ArrayList<>(); stus.add(new Stu("张三", 16, "male")); stus.add(new Stu("huhu", 18, "male")); stus.add(new Stu("王五", 32, "male")); stus.add(new Stu("张红", 23, "female")); stus.add(new Stu("李四", 35, "male")); stus.add(new Stu("张小雅", 31, "female")); return stus; } }

输出结果：

性别为男，名字为：张三  // salience 4

名字为：张三                   // salience 3 age>30岁的人： 张小雅   // salience 2 age>30岁的人： 李四       // salience 2 age>30岁的人： 王五        // salience 2 性别为男，age>25的人： 李四   // salience 1 性别为男，age>25的人： 王五    // salience 1 End ... name : 张三, age : 16, gender :male, amount : 15000 name : huhu, age : 18, gender :male, amount : 0 name : 王五, age : 32, gender :male, amount : 8000 name : 张红, age : 23, gender :female, amount : 0 name : 李四, age : 35, gender :male, amount : 8000 name : 张小雅, age : 31, gender :female, amount : 30000