在Springboot中使用Drools，简单使用

目录结构

步骤一：添加依赖

        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-core</artifactId>
            <version>7.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-compiler</artifactId>
            <version>7.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-decisiontables</artifactId>
            <version>7.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.drools</groupId>
            <artifactId>drools-templates</artifactId>
            <version>7.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-spring</artifactId>
            <version>7.0.0.Final</version>
        </dependency>

步骤二：编写drools配置文件，方便等会注入引用

package com.example.testdrools.config;

import org.kie.api.KieBase;
import org.kie.api.KieServices;
import org.kie.api.builder.*;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import org.kie.internal.io.ResourceFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.IOException;

@Configuration
public class DroolsAutoConfiguration {
    private static final String RULES_PATH = "rules/";

    @Bean
    @ConditionalOnMissingBean(KieFileSystem.class)
    public KieFileSystem kieFileSystem() throws IOException {
        KieFileSystem kieFileSystem = getKieServices().newKieFileSystem();
        for (Resource file : getRuleFiles()) {
            kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_PATH + file.getFilename(), "UTF-8"));
        }
        return kieFileSystem;
    }

    private Resource[] getRuleFiles() throws IOException {
        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        return resourcePatternResolver.getResources("classpath*:" + RULES_PATH + "**/*.*");
    }

    @Bean
    @ConditionalOnMissingBean(KieContainer.class)
    public KieContainer kieContainer() throws IOException {
        final KieRepository kieRepository = getKieServices().getRepository();

        kieRepository.addKieModule(new KieModule() {
            public ReleaseId getReleaseId() {
                return kieRepository.getDefaultReleaseId();
            }
        });

        KieBuilder kieBuilder = getKieServices().newKieBuilder(kieFileSystem());
        kieBuilder.buildAll();

        return getKieServices().newKieContainer(kieRepository.getDefaultReleaseId());
    }

    private KieServices getKieServices() {
        return KieServices.Factory.get();
    }

    @Bean
    @ConditionalOnMissingBean(KieBase.class)
    public KieBase kieBase() throws IOException {
        return kieContainer().getKieBase();
    }

    @Bean
    @ConditionalOnMissingBean(KieSession.class)
    public KieSession kieSession() throws IOException {
        return kieContainer().newKieSession();
    }


}

步骤三：创建一个实体类

package com.example.testdrools.entity;

import java.util.Date;

public class UserInfo {

    private int id;
    private String username;
    private String telephone;
    private String mail;
    private String password;
    private String deptId; //部门id
    private int status;//1正常 0冻结 2删除
    private String remark;
    private Date operateTime;
    private String operateIp;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public String getMail() {
        return mail;
    }

    public void setMail(String mail) {
        this.mail = mail;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDeptId() {
        return deptId;
    }

    public void setDeptId(String deptId) {
        this.deptId = deptId;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public Date getOperateTime() {
        return operateTime;
    }

    public void setOperateTime(Date operateTime) {
        this.operateTime = operateTime;
    }

    public String getOperateIp() {
        return operateIp;
    }

    public void setOperateIp(String operateIp) {
        this.operateIp = operateIp;
    }

    @Override
    public String toString() {
        return "UserInfo{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", telephone='" + telephone + '\'' +
                ", mail='" + mail + '\'' +
                ", password='" + password + '\'' +
                ", deptId='" + deptId + '\'' +
                ", status=" + status +
                ", remark='" + remark + '\'' +
                ", operateTime=" + operateTime +
                ", operateIp='" + operateIp + '\'' +
                '}';
    }
}

步骤四：编写一个规则

package rules

import com.example.testdrools.entity.UserInfo;
import java.util.List

rule "User"
    when
        $user:UserInfo(username=='liu')
    then
        System.out.println("名字相同，成功执行");
end

步骤五：编写一个控制类用于测试

package com.example.testdrools.controller;

import com.example.testdrools.entity.UserInfo;
import org.kie.api.runtime.KieSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class DroolRule {

    @Autowired
    KieSession kieSession;

    @RequestMapping("/rule1")
    @ResponseBody
    public String rule1() {

        UserInfo userInfo = new UserInfo();
        userInfo.setUsername("liu");
        userInfo.setTelephone("123456");

        kieSession.insert(userInfo);

        int firedCount = kieSession.fireAllRules();
        System.out.println("触发了" + firedCount + "条规则");

        return "触发了" + firedCount + "条规则";
    }
}

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