如何實作Springboot+camunda+mysql的集成

本文介紹基于mysql資料庫，如何實作camunda與springboot的集成，如何實作基于springboot運行camunda開源流程引擎，

一、創建springboot工程

使用IDEA工具，選擇File->New->Project，選擇Spring Initialzr

輸入springboot工程基本資訊，本示例命名為“camunda-demo1”, jdk版本選擇8

在選擇springboot組件的時候，需要選擇Spring Web、JDBC API、MySql Driver 這三個組件，點擊下一步完成即可，

二、修改maven配置

2.1、修改springboot版本號

由于camunda版本與springboot版本有匹配關系，所以需要修改springboot版本為2.4.3，

官方推薦Camunda7.1.5版本使用Spring Boot 2.4.x版本

具體配置參考camunda官方說明檔案：https://docs.camunda.org/manual/7.15/user-guide/spring-boot-integration/version-compatibility/

Pom.xm代碼片段:

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

2.2、引入camunda包

由于本示例要使用camunda流程引擎、web界面、Rest服務介面，所以需要匯入camunda-bpm-spring-boot-starter、camunda-bpm-spring-boot-starter-rest、camunda-bpm-spring-boot-starter-webapp這三個依賴包，如果僅僅是使用流程引擎，只需要引入camunda-bpm-spring-boot-starter就可以了，

完整的pom.xml檔案如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>camunda-demo1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>camunda-demo1</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm.springboot</groupId>
            <artifactId>camunda-bpm-spring-boot-starter</artifactId>
            <version>7.15.0</version>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm.springboot</groupId>
            <artifactId>camunda-bpm-spring-boot-starter-rest</artifactId>
            <version>7.15.0</version>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm.springboot</groupId>
            <artifactId>camunda-bpm-spring-boot-starter-webapp</artifactId>
            <version>7.15.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

三、修改application.yaml配置

打開工程目錄下的main\resources\application.yaml檔案，如果沒有該檔案，手動新建一個，錄入如下資訊，

# Find more available configuration properties on the following pages of the documentation.
# https://docs.camunda.org/manual/latest/user-guide/camunda-bpm-run/#configure-camunda-bpm-run
# https://docs.camunda.org/manual/latest/user-guide/spring-boot-integration/configuration/#camunda-engine-properties

camunda.bpm:
  generic-properties.properties:
     javaSerializationFormatEnabled: true
  admin-user:
    id: demo
    password: demo
  run:
# https://docs.camunda.org/manual/latest/user-guide/camunda-bpm-run/#cross-origin-resource-sharing
    cors:
      enabled: true
      allowed-origins: "*"

# datasource configuration is required
spring.datasource:
  url: jdbc:mysql://127.0.0.1:3306/camunda-715?characterEncoding=UTF-8&useUnicode=true&useSSL=false&zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai
  driver-class-name: com.mysql.cj.jdbc.Driver
  username: root
  password: root

# By default, Spring Boot serves static content from any directories called /static or /public or /resources or
# /META-INF/resources in the classpath. To prevent users from accidentally sharing files, this is disabled here by setting static locations to NULL.
# https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-spring-mvc-static-content
spring.web.resources:
  static-locations: NULL

本示例使用的是mysql資料庫，資料庫URL、username、 password 跟后面資料庫資訊保存一致，

四、創建mysql資料庫

Camunda默認使用已預先配置好的H2資料庫，本示例使用mysql資料庫，需要提前創建mysql資料庫并匯入Camunda建表腳本，

為Camunda平臺創建一個資料庫模式，名稱為camunda715

匯入SQL腳本，執行創建所有必需的表和默認索引的SQL DDL腳本，這些腳本可以在configuration/sql/create檔案夾中找到，共2個腳本，都需要匯入，

匯入完成后的表結構，共40張表：

詳細配置方法參考：https://lowcode.blog.csdn.net/article/details/117564836

五、啟動springboot工程

創建springboot工程的時候，自動生成了SpringBootApplication啟動類，運行改類啟動即可，

package com.example.demo1;

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

@SpringBootApplication
public class CamundaDemo1Application {

    public static void main(String[] args) {
        SpringApplication.run(CamundaDemo1Application.class, args);
    }

}

六、登錄訪問camunda

訪問：http://localhost:8080,

默認賬號密碼demo/demo

登錄成功后進入camunda控制臺

至此，完成了springboot2.4.3+camunda7.15+mysql的集成，后續的如何設計流程、如何啟動流程、如何審批流程等操作，跟非springboot方式是一致的，請參考前面的文章，

https://lowcode.blog.csdn.net/article/details/117518828

https://lowcode.blog.csdn.net/article/details/118055189

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