Springboot+activity5.22.0工作流集成并且集成视图模型

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码海兴辰 2021-12-08 16:05:09 ©著作权

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前言：我们在开发类似审批，请假，常常要很多流，如果按照写代码的方式那逻辑，代码量就多了，所以我们可以用有些工作流框架来实现，像activity和Camunda等工作流框架来实现。

一：Springboot集成activity工作流的实现

1.先要在pom.xml加入依赖，我们可以看到集成了activity,engine,modeler等基础依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>net.sourceforge.nekohtml</groupId>
            <artifactId>nekohtml</artifactId>
            <version>1.9.22</version>
        </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>

        <!--activiti begin-->
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-engine</artifactId>
            <version>${activiti.version}</version>
        </dependency>

        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring</artifactId>
            <version>${activiti.version}</version>
        </dependency>

        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-modeler</artifactId>
            <version>${activiti.version}</version>
        </dependency>

        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-diagram-rest</artifactId>
            <version>${activiti.version}</version>
        </dependency>

2.写一些有关activity自动建表和实现代码

一：有些公有配置项

1> ActivityConfig.java

@Configuration
public class ActivityConfig {

    //流程配置，与spring整合采用SpringProcessEngineConfiguration这个实现
    @Bean
    public ProcessEngineConfiguration processEngineConfiguration(DataSource dataSource, PlatformTransactionManager transactionManager){
        SpringProcessEngineConfiguration processEngineConfiguration = new SpringProcessEngineConfiguration();
        processEngineConfiguration.setDataSource(dataSource);
        processEngineConfiguration.setDatabaseSchemaUpdate("true");
        processEngineConfiguration.setDatabaseType("mysql");

        processEngineConfiguration.setTransactionManager(transactionManager);

        //流程图字体
        processEngineConfiguration.setActivityFontName("宋体");
        processEngineConfiguration.setAnnotationFontName("宋体");
        processEngineConfiguration.setLabelFontName("宋体");

        return processEngineConfiguration;
    }

    //流程引擎，与spring整合使用factoryBean
    @Bean
    public ProcessEngineFactoryBean processEngine(ProcessEngineConfiguration processEngineConfiguration){
        ProcessEngineFactoryBean processEngineFactoryBean = new ProcessEngineFactoryBean();
        processEngineFactoryBean.setProcessEngineConfiguration((ProcessEngineConfigurationImpl) processEngineConfiguration);
        return processEngineFactoryBean;
    }

    //八大接口
    @Bean
    public RepositoryService repositoryService(ProcessEngine processEngine){
        return processEngine.getRepositoryService();
    }

    @Bean
    public RuntimeService runtimeService(ProcessEngine processEngine){
        return processEngine.getRuntimeService();
    }

    @Bean
    public TaskService taskService(ProcessEngine processEngine){
        return processEngine.getTaskService();
    }

    @Bean
    public HistoryService historyService(ProcessEngine processEngine){
        return processEngine.getHistoryService();
    }

    @Bean
    public FormService formService(ProcessEngine processEngine){
        return processEngine.getFormService();
    }

    @Bean
    public IdentityService identityService(ProcessEngine processEngine){
        return processEngine.getIdentityService();
    }

    @Bean
    public ManagementService managementService(ProcessEngine processEngine){
        return processEngine.getManagementService();
    }

    @Bean
    public DynamicBpmnService dynamicBpmnService(ProcessEngine processEngine){
        return processEngine.getDynamicBpmnService();
    }

    //八大接口 end
}

2> UtilConfig.java

@Configuration
public class UtilConfig {


    //jackson xml util
    @Bean
    public ObjectMapper objectMapper(){
        return new ObjectMapper();
    }
}

3> ViewConfig

@Configuration
public class ViewConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("/index.html");
    }
}

二：模型管理项

1> DeploymentController

/**
 * 模型管理
 */
@RestController
@RequestMapping("models")
public class ModelerController implements RestServiceController<Model, String> {

    @Autowired
    RepositoryService repositoryService;
    @Autowired
    ObjectMapper objectMapper;

    /**
     * 新建一个空模型
     * @return
     * @throws UnsupportedEncodingException
     */
    @PostMapping("newModel")
    public Object newModel() throws UnsupportedEncodingException {
        //初始化一个空模型
        Model model = repositoryService.newModel();

        //设置一些默认信息
        String name = "new-process";
        String description = "";
        int revision = 1;
        String key = "process";

        ObjectNode modelNode = objectMapper.createObjectNode();
        modelNode.put(ModelDataJsonConstants.MODEL_NAME, name);
        modelNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION, description);
        modelNode.put(ModelDataJsonConstants.MODEL_REVISION, revision);

        model.setName(name);
        model.setKey(key);
        model.setMetaInfo(modelNode.toString());

        repositoryService.saveModel(model);
        String id = model.getId();

        //完善ModelEditorSource
        ObjectNode editorNode = objectMapper.createObjectNode();
        editorNode.put("id", "canvas");
        editorNode.put("resourceId", "canvas");
        ObjectNode stencilSetNode = objectMapper.createObjectNode();
        stencilSetNode.put("namespace",
                "http://b3mn.org/stencilset/bpmn2.0#");
        editorNode.put("stencilset", stencilSetNode);
        repositoryService.addModelEditorSource(id,editorNode.toString().getBytes("utf-8"));
        return ToWeb.buildResult().redirectUrl("/editor?modelId="+id);
    }


    /**
     * 发布模型为流程定义
     * @param id
     * @return
     * @throws Exception
     */
    @PostMapping("{id}/deployment")
    public Object deploy(@PathVariable("id")String id) throws Exception {

        //获取模型
        Model modelData = repositoryService.getModel(id);
        byte[] bytes = repositoryService.getModelEditorSource(modelData.getId());

        if (bytes == null) {
            return ToWeb.buildResult().status(Status.FAIL)
                    .msg("模型数据为空，请先设计流程并成功保存，再进行发布。");
        }

        JsonNode modelNode = new ObjectMapper().readTree(bytes);

        BpmnModel model = new BpmnJsonConverter().convertToBpmnModel(modelNode);
        if(model.getProcesses().size()==0){
            return ToWeb.buildResult().status(Status.FAIL)
                    .msg("数据模型不符要求，请至少设计一条主线流程。");
        }
        byte[] bpmnBytes = new BpmnXMLConverter().convertToXML(model);

        //发布流程
        String processName = modelData.getName() + ".bpmn20.xml";
        Deployment deployment = repositoryService.createDeployment()
                .name(modelData.getName())
                .addString(processName, new String(bpmnBytes, "UTF-8"))
                .deploy();
        modelData.setDeploymentId(deployment.getId());
        repositoryService.saveModel(modelData);

        return ToWeb.buildResult().refresh();
    }

    @Override
    public Object getOne(@PathVariable("id") String id) {
        Model model = repositoryService.createModelQuery().modelId(id).singleResult();
        return ToWeb.buildResult().setObjData(model);
    }

    @Override
    public Object getList(@RequestParam(value = "rowSize", defaultValue = "1000", required = false) Integer rowSize, @RequestParam(value = "page", defaultValue = "1", required = false) Integer page) {
        List<Model> list = repositoryService.createModelQuery().listPage(rowSize * (page - 1)
                , rowSize);
        long count = repositoryService.createModelQuery().count();

        return ToWeb.buildResult().setRows(
                ToWeb.Rows.buildRows().setCurrent(page)
                        .setTotalPages((int) (count/rowSize+1))
                        .setTotalRows(count)
                        .setList(list)
                        .setRowSize(rowSize)
        );
    }

    public Object deleteOne(@PathVariable("id")String id){
        repositoryService.deleteModel(id);
        return ToWeb.buildResult().refresh();
    }

    @Override
    public Object postOne(@RequestBody Model entity) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Object putOne(@PathVariable("id") String s, @RequestBody Model entity) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Object patchOne(@PathVariable("id") String s, @RequestBody Model entity) {
        throw new UnsupportedOperationException();
    }


}

三：保存或者修改模型项

1> ModelSaveRestResource

@RestController
@RequestMapping("service")
public class ModelSaveRestResource implements ModelDataJsonConstants {

  protected static final Logger LOGGER = LoggerFactory.getLogger(ModelSaveRestResource.class);

  @Autowired
  private RepositoryService repositoryService;

  @Autowired
  private ObjectMapper objectMapper;

  @RequestMapping(value="/model/{modelId}/save", method = RequestMethod.PUT)
  @ResponseStatus(value = HttpStatus.OK)
  public void saveModel(@PathVariable String modelId
          , String name, String description
          , String json_xml, String svg_xml) {
    try {

      Model model = repositoryService.getModel(modelId);

      ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());

      modelJson.put(MODEL_NAME, name);
      modelJson.put(MODEL_DESCRIPTION, description);
      model.setMetaInfo(modelJson.toString());
      model.setName(name);

      repositoryService.saveModel(model);

      repositoryService.addModelEditorSource(model.getId(), json_xml.getBytes("utf-8"));

      InputStream svgStream = new ByteArrayInputStream(svg_xml.getBytes("utf-8"));
      TranscoderInput input = new TranscoderInput(svgStream);

      PNGTranscoder transcoder = new PNGTranscoder();
      // Setup output
      ByteArrayOutputStream outStream = new ByteArrayOutputStream();
      TranscoderOutput output = new TranscoderOutput(outStream);

      // Do the transformation
      transcoder.transcode(input, output);
      final byte[] result = outStream.toByteArray();
      repositoryService.addModelEditorSourceExtra(model.getId(), result);
      outStream.close();

    } catch (Exception e) {
      LOGGER.error("Error saving model", e);
      throw new ActivitiException("Error saving model", e);
    }
  }

2> ModelEditorJsonRestResource

@RestController
@RequestMapping("service")
public class ModelEditorJsonRestResource implements ModelDataJsonConstants {

  protected static final Logger LOGGER = LoggerFactory.getLogger(ModelEditorJsonRestResource.class);

  @Autowired
  private RepositoryService repositoryService;

  @Autowired
  private ObjectMapper objectMapper;

  @RequestMapping(value="/model/{modelId}/json", method = RequestMethod.GET, produces = "application/json")
  public ObjectNode getEditorJson(@PathVariable String modelId) {
    ObjectNode modelNode = null;

    Model model = repositoryService.getModel(modelId);

    if (model != null) {
      try {
        if (StringUtils.isNotEmpty(model.getMetaInfo())) {
          modelNode = (ObjectNode) objectMapper.readTree(model.getMetaInfo());
        } else {
          modelNode = objectMapper.createObjectNode();
          modelNode.put(MODEL_NAME, model.getName());
        }
        modelNode.put(MODEL_ID, model.getId());
        ObjectNode editorJsonNode = (ObjectNode) objectMapper.readTree(
            new String(repositoryService.getModelEditorSource(model.getId()), "utf-8"));
        modelNode.put("model", editorJsonNode);

      } catch (Exception e) {
        LOGGER.error("Error creating model JSON", e);
        throw new ActivitiException("Error creating model JSON", e);
      }
    }
    return modelNode;
  }
}