drools应用开发点

一、规则文件 灵活加载

                     KnowledgeBuilder kb = KnowledgeBuilderFactory.newKnowledgeBuilder();  
                String rule = ""//可以从数据库中查询
            //装入规则，可以装入多个  
            kb.add(ResourceFactory.newByteArrayResource(rule.getBytes("utf-8")), ResourceType.DRL);   
            KnowledgeBuilderErrors errors = kb.getErrors();  
            for (KnowledgeBuilderError error : errors) {  
                System.out.println(error);  
            }  
            KnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase();  
            kBase.addKnowledgePackages(kb.getKnowledgePackages());  
            kSession = kBase.newStatefulKnowledgeSession();  
            Message message1 = new Message();  
            message1.setStatus(1);  
            message1.setMsg("hello world!");  
            kSession.insert(message1);  
            kSession.fireAllRules();