java - 电子表格决策可以被打破吗？

Question

我尝试使用 Excel 格式 (*.xlsx)(一种电子表格)的表格决策。我不想将电子表格放在应用程序的文件夹资源中。所以我创建了一个文件夹:folder/Discount.xls。

但是当我运行程序时，它会抛出“文件未找到”异常。如果电子表格文件不在资源文件夹中，则似乎无法加载，因此在 jar 中。

我想知道我是否可以在电子表格时制作一个程序，以便我的规则可以动态加载？我会选择一个或另一个电子表格来对我的规则进行热更改。但不知道是否可行。

我有一些代码:

    KieServices kieServices = KieServices.Factory.get();
    File file = new File("folder/Discount.xls");
    Resource resource = ResourceFactory.newFileResource(file);
    KieFileSystem kieFileSystem = kieServices.newKieFileSystem().write(resource);
    KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);
    kieBuilder.buildAll();
    KieRepository kieRepository = kieServices.getRepository();
    ReleaseId krDefaultReleaseId = kieRepository.getDefaultReleaseId();
    KieContainer kieContainer = kieServices.newKieContainer(krDefaultReleaseId);
    KieSession kieSession = kieContainer.newKieSession();

前面的代码抛出运行时异常:

Exception in thread "main" java.lang.RuntimeException: Cannot find KieModule: org.default:artifact:1.0.0

Answer 1

我找到了问题的解决方案。电子表格可以位于 java 资源文件夹之外的其他文件夹中。我的类测试如下:

public class Main {

    private static InternalKnowledgeBase createKnowledgeBaseFromSpreadsheet() throws Exception {

        DecisionTableConfiguration decisionTableConfiguration = KnowledgeBuilderFactory.newDecisionTableConfiguration();
        decisionTableConfiguration.setInputType(DecisionTableInputType.XLS);
        KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        File file = new File("folder/Discount.xls");
        Resource resourceFile = ResourceFactory.newFileResource(file);
        knowledgeBuilder.add(resourceFile, ResourceType.DTABLE, decisionTableConfiguration);

        if (knowledgeBuilder.hasErrors()) {
            throw new RuntimeException(knowledgeBuilder.getErrors().toString());
        }

        InternalKnowledgeBase internalKnowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();
        Collection<KiePackage> kiePackages = knowledgeBuilder.getKnowledgePackages();
        internalKnowledgeBase.addPackages(kiePackages);
        return internalKnowledgeBase;
    }

    public static void main(String[] args) {

        (new Main()).run();
    }

    public void run() {
        System.out.println("--- Start Code ---");
        StatelessKieSession session = null;

        try {
            InternalKnowledgeBase knowledgeBase = createKnowledgeBaseFromSpreadsheet();
            session = knowledgeBase.newStatelessKieSession();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Customer customer = new Customer(CustomerType.INDIVIDUAL, 1);
        System.out.println(customer.toString());
        session.execute(customer);
        System.out.println(customer.toString());
        System.out.println("--- End Code ---");
    }
}

我的客户类(必须添加 getter、setter 并覆盖 toString 方法):

public class Customer {

    public enum CustomerType {
        INDIVIDUAL, BUSINESS;
    }
    private CustomerType type;
    private int years;
    private int discount;

    public Customer(CustomerType individual, int years) {
        this.type = individual;
        this.years = years;
    }
}

我的 *.pom 文件包含:

<dependencies>
    <dependency>
        <groupId>org.kie</groupId>
        <artifactId>kie-ci</artifactId>
        <version>7.28.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.drools</groupId>
        <artifactId>drools-decisiontables</artifactId>
        <version>7.28.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.7</version>
        <scope>runtime</scope>
    </dependency>