实战项目之使用LiteFlow编写一个流程引擎（三）

上一篇文章《实战项目之使用LiteFlow编写一个流程引擎（二）》我们介绍了整个业务背景，同时也画了一个图展示整个的流程逻辑。这篇文章我们来创建一下相关的项目。这里的案例我们使用springboot的方式给大家演示，同时配置文件使用本地配置文件存储。

一、创建一个maven项目，并且引入依赖

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.yomahub</groupId>
            <artifactId>liteflow-spring-boot-starter</artifactId>
            <version>2.9.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.14.8</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.83</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.0.1.Final</version>
        </dependency>
    </dependencies>

二、创建application.yml，内容如下：

# spring
spring:
  # profiles
  profiles:
    active: dev

liteflow: 
  rule-source: config/flow.el.xml

上面的liteflow.rule-source=config/flow.el.xml是liteflow的相关配置文件的地方，这个配置是必须的，千万别忘记了。

三、创建logback-spring.xml，内容如下：

<?xml version="1.0" encoding="UTF-8" ?>

<configuration>
    <property name="LOG_HOME" value="./logs"/>

    <!-- 控制台输出 -->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{50} - %msg%n</pattern>
            <charset>utf-8</charset>
        </encoder>
    </appender>

    <appender name="CORE_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${LOG_HOME}/core.%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>60</MaxHistory>
            <totalSizeCap>1GB</totalSizeCap>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{50} - %msg%n</pattern>
            <charset>utf8</charset>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
        </filter>
    </appender>

    <appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${LOG_HOME}/error.%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>60</MaxHistory>
            <totalSizeCap>1GB</totalSizeCap>
        </rollingPolicy>
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{50} - %msg%n</pattern>
            <charset>utf8</charset>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>
        </filter>
    </appender>

    <root level="INFO" additivity="false">
        <!--        <springProfile name="dev">-->
        <!--            <appender-ref ref="STDOUT"/>-->
        <!--        </springProfile>-->
        <!--        <springProfile name="local">-->
        <!--            <appender-ref ref="STDOUT"/>-->
        <!--        </springProfile>-->
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="CORE_FILE"/>
        <appender-ref ref="ERROR_FILE"/>
    </root>

</configuration>

四、创建Application.java

package com.school.admission;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

	public static void main(String[] args) {
		
		SpringApplication.run(Application.class, args);
	}
}

五、创建StudentController.java

package com.school.admission.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.school.admission.context.AdmissionContext;
import com.school.admission.model.AdmissionResult;
import com.school.admission.model.BaseResponse;
import com.school.admission.model.StudentPoJO;
import com.yomahub.liteflow.core.FlowExecutor;
import com.yomahub.liteflow.flow.LiteflowResponse;

@RestController
public class StudentController {

	@RequestMapping("/admiss")
	public String admission() {

		return "hello";
	}

}

以上我们一个基础的springboot项目就创建好了，运行起来，请求http://127.0.0.1:8080/admin看下效果。