Springboot整合camunda+mysql的集成流程分析

更新時間：2021年06月24日 14:26:08 作者：大齡碼農(nóng)有夢想

本文介紹基于mysql數(shù)據(jù)庫，如何實現(xiàn)camunda與springboot的集成，如何實現(xiàn)基于springboot運行camunda開源流程引擎，本文分步驟圖文相結(jié)合給大家介紹的非常詳細，需要的朋友參考下吧

一、創(chuàng)建springboot工程

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

輸入springboot工程基本信息，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官方說明文檔：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/> 
    </parent>

2.2、引入camunda包

由于本示例要使用camunda流程引擎、web界面、Rest服務接口，所以需要導入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文件如下：

<?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文件，如果沒有該文件，手動新建一個，錄入如下信息。

# 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/camunda715?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數(shù)據(jù)庫，數(shù)據(jù)庫URL、username、 password 跟后面數(shù)據(jù)庫信息保存一致。

四、創(chuàng)建mysql數(shù)據(jù)庫

Camunda默認使用已預先配置好的H2數(shù)據(jù)庫，本示例使用mysql數(shù)據(jù)庫，需要提前創(chuàng)建mysql數(shù)據(jù)庫并導入Camunda建表腳本。

為Camunda平臺創(chuàng)建一個數(shù)據(jù)庫模式，名稱為camunda715

導入SQL腳本。執(zhí)行創(chuàng)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文件夾中找到。共2個腳本，都需要導入。

導入完成后的表結(jié)構(gòu)，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(chuàng)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);
}

}