整合flowable官方editor-app源码BPMN2建模(2)

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boot-admin 是一款采用前后端分离模式、基于SpringCloud微服务架构的SaaS后台管理框架。系统内置基础管理、权限管理、运行管理、定义管理、代码生成器和办公管理6个功能模块，集成分布式事务Seata、工作流引擎Flowable、业务规则引擎Drools、后台作业调度框架Quartz等，技术栈包括Mybatis-plus、Redis、Nacos、Seata、Flowable、Drools、Quartz、SpringCloud、Springboot Admin Gateway、Liquibase、jwt、Openfeign、I18n等。

在上一篇博文中，已经介绍了 boot-admin 对 editor-app 前端代码的集成改造，接下来我们看看后端代码。

# 提供汉化资源json数据

   /**
     * 获取汉化资源
     * @return
     */
    @RequestMapping(value = "/editor/stencilset", method = RequestMethod.GET, produces = "application/json;charset=utf-8")
    public String getStencilset() {
        InputStream stencilsetStream = this.getClass().getClassLoader().getResourceAsStream("stencilset.json");
        try {
            return IOUtils.toString(stencilsetStream, "utf-8");
        } catch (Exception e) {
            throw new FlowableException("Error while loading stencil set", e);
        }
    }

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资源包stencilset.json需放在resources文夹下，这里提供下载：点击下载汉化包

# 分页获取模型列表

controller：

@RequestMapping("/api/workflow/auth/activiti")
@RestController
@Slf4j
public class ModelController extends BaseController {
    @Resource
    private FormValidator formValidator;
    @Autowired
    private MyModelService modelService;

    @PostMapping("/model/page")
    @ApiOperation("分页获取项目数据表列表")
    public ResultDTO getTablePage(@Valid @RequestBody ModelQueryVO queryVO, BindingResult bindingResult) throws Exception {
        if (bindingResult.hasErrors()) {
            return formValidator.generateMessage(bindingResult);
        }
        return modelService.getPage(queryVO);
    }
}

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service:

    @Override
    public ResultDTO getPage(ModelQueryVO queryVO) throws Exception {
        int offset = (queryVO.getCurrentPage() - 1) * queryVO.getPageSize() + 0;
        List<Model> list = repositoryService.createModelQuery().listPage(offset
                , queryVO.getPageSize());
        int total = (int) repositoryService.createModelQuery().count();
        Page<Model> page = new Page<>();
        page.setRecords(list);
        page.setTotal(total);
        return ResultDTO.success(page);
    }

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# 读取模型数据

controller：

@RequestMapping("/api/workflow/auth/activiti")
@RestController
@Slf4j
public class ModelController extends BaseController {
    @Autowired
    private RepositoryService repositoryService;
    @Autowired
    private ObjectMapper objectMapper;
    /**
     * 获取用于编辑的模型JSON数据
     * @param modelId 模型ID
     * @return
     */
    @GetMapping(value = "/model/json")
    public ObjectNode getEditorJson(@RequestParam("modelId") 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) {
                log.error("Error creating model JSON", e);
                throw new FlowableException("Error creating model JSON", e);
            }
        }
        return modelNode;
    }
}

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# 增加新模型

controller：

@RequestMapping("/api/workflow/auth/activiti")
@RestController
@Slf4j
public class ModelController extends BaseController {
    @Resource
    private FormValidator formValidator;
    @Autowired
    private MyModelService modelService;
    
    @PostMapping("/model/add")
    @ApiOperation("保存数据")
    public ResultDTO save(@Valid @RequestBody ModelDataVO dataVO, BindingResult bindingResult) throws Exception {
        if (bindingResult.hasErrors()) {
            return formValidator.generateMessage(bindingResult);
        }
        BaseUser baseUser = UserTool.getBaseUser();
        return modelService.addNewModel(dataVO, baseUser);
    }
}

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service：

    @Override
    public ResultDTO addNewModel(ModelDataVO dataVO, BaseUser baseUser) throws Exception {
        //初始化一个空模型
        Model model = repositoryService.newModel();
        //设置一些默认信息
        String name = dataVO.getName();
        String description = dataVO.getDescription();
        int revision = 1;
        String key = dataVO.getKey();

        ObjectNode modelNode = objectMapper.createObjectNode();
        modelNode.put(MODEL_NAME, name);
        modelNode.put(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 ResultDTO.success(id);
    }

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# 保存模型数据

    /**
     * 保存模型数据
     * @param modelId
     * @param name
     * @param description
     * @param json_xml
     * @param svg_xml
     */
    @RequestMapping(value = "/model/save", method = RequestMethod.PUT)
    @ResponseStatus(value = HttpStatus.OK)
    public void saveModel(@RequestParam("modelId") 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) {
            log.error("Error saving model", e);
            throw new FlowableException("Error saving model", e);
        }
    }

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# 删除模型

controller：

@RequestMapping("/api/workflow/auth/activiti")
@RestController
@Slf4j
public class ModelController extends BaseController {
    @Resource
    private FormValidator formValidator;
    @Autowired
    private MyModelService modelService;
    
    @PostMapping("/model/del")
    @ApiOperation("删除数据")
    public ResultDTO del(@Valid @RequestBody GuidContainerVO guidContainerVO, BindingResult bindingResult) throws Exception {
        if (bindingResult.hasErrors()) {
            return formValidator.generateMessage(bindingResult);
        }
        return modelService.delete(guidContainerVO.getGuid());
    }    
}

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service：

    @Override
    public ResultDTO delete(String guid) throws Exception {
        repositoryService.deleteModel(guid);
        return ResultDTO.success();
    }

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# 发布（部署）模型

@RequestMapping("/api/workflow/auth/activiti")
@RestController
@Slf4j
public class ModelController extends BaseController {
    @Resource
    private FormValidator formValidator;
    @Autowired
    private MyModelService modelService;
   
    @PostMapping("/model/deploy")
    public ResultDTO deploy(@Valid @RequestBody GuidContainerVO guidContainerVO, BindingResult bindingResult) throws Exception {
        if (bindingResult.hasErrors()) {
            return formValidator.generateMessage(bindingResult);
        }
        return modelService.deploy(guidContainerVO.getGuid());
    }
}

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service：

    @Override
    public ResultDTO deploy(String guid) throws Exception {
        /**获取模型 **/
        Model modelData = repositoryService.getModel(guid);
        byte[] bytes = repositoryService.getModelEditorSource(modelData.getId());
        if (bytes == null) {
            return ResultDTO.failureCustom("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 ResultDTO.failureCustom("数据模型不符要求，请至少设计一条主线流程。");
        }
        /** 设置名称 **/
        if(StringUtils.isNotBlank(modelData.getCategory())) {
            model.setTargetNamespace(modelData.getCategory());
        }
        byte[] bpmnBytes = new BpmnXMLConverter().convertToXML(model);

        /** 发布流程 .bpmn20.xml必需加 **/
        String processName = modelData.getName() + ".bpmn20.xml";
        Deployment deployment = repositoryService.createDeployment()
                .name(modelData.getName())
                .category(modelData.getCategory())
                .key(modelData.getKey())
                .addString(processName, new String(bpmnBytes, "UTF-8"))
                .deploy();
        modelData.setDeploymentId(deployment.getId());
        repositoryService.saveModel(modelData);
        return ResultDTO.success();
    }