Activiti Explorer 源碼淺析

時間  2019-12-10
標籤 activiti explorer 源碼 淺析 欄目 瀏覽器 简体版
原文   原文鏈接

概述

注意：本文中 Activiti 的版本爲 5.22，爲 5.X 系列的最後一個 RELEASE 版本。目前 Activiti 已經發展到了 7.X 版本，爲啥還用 5.X 版本，仍是存量項目的緣由。javascript

咱們的需求是將 Activiti 官網的 Demo 的流程設計器功能整合到咱們項目中，主要須要的功能是 Web 流程設計器 —— Activiti Modeler。Web 流程設計器的查找和保存功能是使用了 RestFul API 調用的，將源碼中的 editor-app 引入再定製化改造便可。除了查找和保存以外，咱們還須要查詢流程圖列表、新建流程圖、刪除流程圖等功能，但是發現這部分並無使用 RestFul API，這幾個功能是在後臺實現的，須要閱讀源碼查看這幾個功能如何實現。css

在閱讀源碼發現 Activiti 在前端 Demo 部分仍是比較混亂，先後端嚴重耦合，如今理清以下：html

  • Activiti Webapp Explorer：指的是官方的 Demo Webapp 工程
  • Activiti Explorer：主要使用 vaadin 來渲染 Activiti Webapp Explorer 中的頁面
  • Activiti Modeler： Web 端流程設計器，後端項目只有 3 個類提供 RestFul 接口，而前端項目則放到了Activiti Webapp Explorer 工程中，使用的是 AngularJS，Activiti Modeler 在 Activiti@5.17 版本由 Alfresco Activiti Enterprise 捐贈。
  • Diagram Viewer: Activiti 官方在 5.12 版本中添加的新組件,以 Raphaël 爲基礎庫，用 REST 方式(從 Activiti - Diagram - REST 模塊)獲取 JSON 數據生成流程圖並把流程的處理過程用不一樣的顏色加以標註。

Activiti Webapp Explorer

Activiti Explorer的 Webapp 工程在源碼中的位置爲 modules/activiti-webapp-explorer2/src/main/webapp，這個工程是官方Demo的核心工程。前端

比較奇怪的是這個 module 在 pom 文件中的 name 爲 Activiti - Webapp - Explorer V2,而整個工程並無 V1 版本，並且這個 module 沒有放到 activiti-explorer 中，而是獨立開來，在 pom.xml 文件中依賴了 activiti-explorer。java

主要的 activiti 相關依賴：

  • activiti-engine
  • activiti-spring
  • activiti-explorer
  • activiti-modeler
  • activiti-diagram-rest
  • activiti-simple-workflow

查看 web.xml 文件：

Listener

首先添加了一個 WebConfigurer 的 listener 用來加載 Spring context：android

<!-- To load the Spring context -->
<listener>
	<listener-class>org.activiti.explorer.servlet.WebConfigurer</listener-class>
</listener>
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WebConfigurer 中配置了一個 mapping 用來相應相關的 REST 請求：git

...
dispatcherServlet.addMapping("/service/*");
...
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第二個 listener 用來支持 Spring Beans 的 session-scoped 做用域：angularjs

<!-- To allow session-scoped beans in Spring -->
<listener>
	<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
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Filter

定義了兩個 filtergithub

第一個 filter 爲 ExplorerFilterweb

<filter>
	<filter-name>UIFilter</filter-name>
	<filter-class>org.activiti.explorer.filter.ExplorerFilter</filter-class>
</filter>
...
<filter-mapping>
	<filter-name>UIFilter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>
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查看 ExplorerFilter 類主要作了以下事情：

判斷請求地址是否以 "/ui"、"/VAADIN"、"/modeler.html"、"/editor-app"、"/service"、"/diagram-viewer"開頭：

  • 若否，則將請求地址添加 "/ui"
  • 如果，判斷是否以 "/service" 開頭
    • 如果，判斷用戶是否登錄，沒登陸報錯，登錄則繼續
    • 若否，則繼續

第二個 filter 爲 JSONPFilter, 對 "/service" 開頭的請求進行過濾，處理 jsonp 的請求：

<filter>
    <filter-name>JSONPFilter</filter-name>
    <filter-class>org.activiti.explorer.servlet.JsonpCallbackFilter</filter-class>
</filter>
...
<filter-mapping>
    <filter-name>JSONPFilter</filter-name>
    <url-pattern>/service/*</url-pattern>
</filter-mapping>
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servlet

定義了名爲 Vaadin Application Servlet 的 servlet，響應 "/ui" 、"/VAADIN" 開頭的請求：

<servlet>
	<servlet-name>Vaadin Application Servlet</servlet-name>
	<servlet-class>org.activiti.explorer.servlet.ExplorerApplicationServlet</servlet-class>
	<init-param>
		<param-name>widgetset</param-name>
		<param-value>org.activiti.explorer.CustomWidgetset</param-value>
	</init-param>
</servlet>

<servlet-mapping>
	<servlet-name>Vaadin Application Servlet</servlet-name>
	<url-pattern>/ui/*</url-pattern>
</servlet-mapping>

<servlet-mapping>
	<servlet-name>Vaadin Application Servlet</servlet-name>
	<url-pattern>/VAADIN/*</url-pattern>
</servlet-mapping>
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查看 ExplorerApplicationServlet 發現出現了一大段用java拼html片斷的代碼，主要做用是渲染根據瀏覽器類型渲染不一樣的css：

@Override
  protected void writeAjaxPageHtmlVaadinScripts(Window window, String themeName, Application application, BufferedWriter page, String appUrl, String themeUri,
          String appId, HttpServletRequest request) throws ServletException, IOException {
    super.writeAjaxPageHtmlVaadinScripts(window, themeName, application, page, appUrl, themeUri, appId, request);
    
    String browserDependentCss = "<script type=\"text/javascript\">//<![CDATA[" +
      "var mobi = ['opera', 'iemobile', 'webos', 'android', 'blackberry', 'ipad', 'safari'];" +
      "var midp = ['blackberry', 'symbian'];" +
      "var ua = navigator.userAgent.toLowerCase();" +
      "if ((ua.indexOf('midp') != -1) || (ua.indexOf('mobi') != -1) || ((ua.indexOf('ppc') != -1) && (ua.indexOf('mac') == -1)) || (ua.indexOf('webos') != -1)) {" +
      " document.write('<link rel=\"stylesheet\" href=\"" + themeUri +"/allmobile.css\" type=\"text/css\" media=\"all\"/>');" +
      " if (ua.indexOf('midp') != -1) {" +
      " for (var i = 0; i < midp.length; i++) {" +
      " if (ua.indexOf(midp[i]) != -1) {" +
      " document.write('<link rel=\"stylesheet\" href=\"" + themeUri +"' + midp[i] + '.css\" type=\"text/css\"/>');" +
      " }" +
      " }"+
      " }" +
     " else {"+
     " if ((ua.indexOf('mobi') != -1) || (ua.indexOf('ppc') != -1) || (ua.indexOf('webos') != -1)) {" +
     " for (var i = 0; i < mobi.length; i++) {" +
     " if (ua.indexOf(mobi[i]) != -1) {" +
     " if ((mobi[i].indexOf('blackberry') != -1) && (ua.indexOf('6.0') != -1)) {" +
     " document.write('<link rel=\"stylesheet\" href=\"" + themeUri + "' + mobi[i] + '6.0.css\" type=\"text/css\"/>');" +
     " }" +
     " else {" +
     " document.write('<link rel=\"stylesheet\" href=\"" + themeUri + "' + mobi[i] + '.css\" type=\"text/css\"/>');" +
     " }" +
     " break;" +
     " }" +
     " }" +
     " }" +
     " }" +
     " }" +
     "if ((navigator.userAgent.indexOf('iPhone') != -1) || (navigator.userAgent.indexOf('iPad') != -1)) {" +
     " document.write('<meta name=\"viewport\" content=\"width=device-width\" />');" +
    "}" +
    " //]]>" +
    "</script>" +
    "<!--[if lt IE 7]><link rel=\"stylesheet\" type=\"text/css\" href=\"" + themeUri + "/lt7.css\" /><![endif]-->";
    
    page.write(browserDependentCss);
  }
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從下面代碼能夠看出，整個前端頁面由ExplorerApp 來渲染：

@Override
  protected Class< ? extends Application> getApplicationClass() throws ClassNotFoundException {
    return ExplorerApp.class;
  }

  @Override
  protected Application getNewApplication(HttpServletRequest request) {
    return (Application) applicationContext.getBean(ExplorerApp.class);
  }
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至此，終於找到了Activiti App的頁面入口 ExplorerApp

Activiti App的頁面入口 ExplorerApp

初始化顯示Login頁面：

public void init() {
    setMainWindow(mainWindow);
    mainWindow.showLoginPage();
  }
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頁面與類的對應關係：

  • 登錄頁面：LoginPage
  • 主頁面佈局：MainLayout
  • 已部署流程定義：ProcessDefinitionPage
  • 流程設計工做區：EditorProcessDefinitionPage

已部署流程定義：ProcessDefinitionPage

主要關注 4 個功能的代碼：

  • 查詢已部署的流程定義的列表
  • 啓動流程
  • 轉換爲可編輯模型？（有一些是禁用的）
  • 根據流程定義ID查詢流程定義信息

一、查詢已部署的流程定義的列表

主要查詢的代碼以下：

// DefaultProcessDefinitionFilter.java
  ...
  public ProcessDefinitionQuery getQuery(RepositoryService repositoryService) {
    return getBaseQuery(repositoryService)
            .orderByProcessDefinitionName().asc()
            .orderByProcessDefinitionKey().asc(); // name is not unique, so we add the order on key (so we can use it in the comparsion of ProcessDefinitionListItem)
  }
  ...
  protected ProcessDefinitionQuery getBaseQuery(RepositoryService repositoryService) {
    return repositoryService
            .createProcessDefinitionQuery()
            .latestVersion()
            .active();
  }
  ...
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獲取到了 ProcessDefinitionQuery 就能夠獲取 ProcessDefinition 列表：

List<ProcessDefinition> processDefinitions = processDefinitionQuery.listPage(start, count);

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processDefinition 的結構以下：

image

二、啓動流程

須要注意的是，在啓動流程還增長了一個判斷 process-definition 是否認義了一個 start-form，因爲在咱們實際使用中不會使用到 start-form，因此咱們在改寫這塊功能的時候增長一個可否發佈的判斷：是否存在 start-form，若存在，則不能啓動；後面的啓動後判斷當前用戶是否存在該流程的任務功能能夠忽略。

// StartProcessInstanceClickListener.java

public void buttonClick(ClickEvent event) {
    // Check if process-definition defines a start-form
    
    StartFormData startFormData = formService.getStartFormData(processDefinition.getId());
    if(startFormData != null && ((startFormData.getFormProperties() != null && !startFormData.getFormProperties().isEmpty()) || startFormData.getFormKey() != null)) {
      parentPage.showStartForm(processDefinition, startFormData);
    } else {
      // Just start the process-instance since it has no form.
      // TODO: Error handling
      ProcessInstance processInstance = runtimeService.startProcessInstanceById(processDefinition.getId());
      
      // Show notification of success
      notificationManager.showInformationNotification(Messages.PROCESS_STARTED_NOTIFICATION, getProcessDisplayName(processDefinition));
      
      // Switch to inbox page in case a task of this process was created
      List<Task> loggedInUsersTasks = taskService.createTaskQuery()
        .taskAssignee(ExplorerApp.get().getLoggedInUser().getId())
        .processInstanceId(processInstance.getId())
        .list();
      if (!loggedInUsersTasks.isEmpty()) {
        ExplorerApp.get().getViewManager().showInboxPage(loggedInUsersTasks.get(0).getId());
      }
    }
  }

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TODO：判斷是否可以啓動流程邏輯：

  • 已經啓動過的流程不能再啓動；
  • 存在start-form，若存在不能啓動

三、轉換爲可編輯模型

可否轉換爲可編輯模塊邏輯：

// ProcessDefinitionDetailPanel.java

    if(((ProcessDefinitionEntity) processDefinition).isGraphicalNotationDefined() == false) {
      editProcessDefinitionButton.setEnabled(false);
    }

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須要注意的是轉換須要彈窗讓用戶二次確認

轉換邏輯：

// ConvertProcessDefinitionPopupWindow.java

        try {
          InputStream bpmnStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(), processDefinition.getResourceName());
          XMLInputFactory xif = XmlUtil.createSafeXmlInputFactory();
          InputStreamReader in = new InputStreamReader(bpmnStream, "UTF-8");
          XMLStreamReader xtr = xif.createXMLStreamReader(in);
          BpmnModel bpmnModel = new BpmnXMLConverter().convertToBpmnModel(xtr);
          
          if (bpmnModel.getMainProcess() == null || bpmnModel.getMainProcess().getId() == null) {
            notificationManager.showErrorNotification(Messages.MODEL_IMPORT_FAILED, 
                i18nManager.getMessage(Messages.MODEL_IMPORT_INVALID_BPMN_EXPLANATION));
          } else {
          
            if (bpmnModel.getLocationMap().isEmpty()) {
              notificationManager.showErrorNotification(Messages.MODEL_IMPORT_INVALID_BPMNDI,
                  i18nManager.getMessage(Messages.MODEL_IMPORT_INVALID_BPMNDI_EXPLANATION));
            } else {
          
              BpmnJsonConverter converter = new BpmnJsonConverter();
              ObjectNode modelNode = converter.convertToJson(bpmnModel);
              Model modelData = repositoryService.newModel();
              
              ObjectNode modelObjectNode = new ObjectMapper().createObjectNode();
              modelObjectNode.put(MODEL_NAME, processDefinition.getName());
              modelObjectNode.put(MODEL_REVISION, 1);
              modelObjectNode.put(MODEL_DESCRIPTION, processDefinition.getDescription());
              modelData.setMetaInfo(modelObjectNode.toString());
              modelData.setName(processDefinition.getName());
              
              repositoryService.saveModel(modelData);
              
              repositoryService.addModelEditorSource(modelData.getId(), modelNode.toString().getBytes("utf-8"));
              
              close();
              ExplorerApp.get().getViewManager().showEditorProcessDefinitionPage(modelData.getId());

	          URL explorerURL = ExplorerApp.get().getURL();
	          URL url = new URL(explorerURL.getProtocol(), explorerURL.getHost(), explorerURL.getPort(),
			          explorerURL.getPath().replace("/ui", "") + "modeler.html?modelId=" + modelData.getId());
              ExplorerApp.get().getMainWindow().open(new ExternalResource(url));
            }
          }
          
        } catch(Exception e) {
          notificationManager.showErrorNotification("error", e);
        }

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四、根據流程定義ID查詢流程定義信息

分爲兩種：

  • 經過 rest 接口獲取流程 diagram 信息，並經過 Diagram Viewer 模塊渲染圖標
  • 直接獲取圖片
方式一：經過 rest 接口獲取流程 diagram 信息
// ProcessDefinitionDiagramLayoutResource.java

@RestController
public class ProcessDefinitionDiagramLayoutResource extends BaseProcessDefinitionDiagramLayoutResource {

  @RequestMapping(value="/process-definition/{processDefinitionId}/diagram-layout", method = RequestMethod.GET, produces = "application/json")
  public ObjectNode getDiagram(@PathVariable String processDefinitionId) {
    return getDiagramNode(null, processDefinitionId);
  }
}
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！注意獲取 processDefinition 和 deployment 的方法：

// AbstractProcessDefinitionDetailPanel.java
// Members
  protected ProcessDefinition processDefinition;
  protected Deployment deployment;

    this.processDefinition = repositoryService.getProcessDefinition(processDefinitionId);

    if(processDefinition != null) {
      deployment = repositoryService.createDeploymentQuery().deploymentId(processDefinition.getDeploymentId()).singleResult();
    }
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方式二：直接獲取圖片
// ProcessDefinitionInfoComponent.java

StreamResource diagram = null;
      
      // Try generating process-image stream
      if(processDefinition.getDiagramResourceName() != null) {
         diagram = new ProcessDefinitionImageStreamResourceBuilder()
          .buildStreamResource(processDefinition, repositoryService);
      }
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流程設計工做區：EditorProcessDefinitionPage

主要關注 8 個功能的代碼：

  • 查詢流程設計工做區模型列表
  • 根據模型Id獲取模型信息
  • 新建模型
  • 刪除模型
  • 部署模型
  • 導入模型
  • 導出模型
  • 查詢左側stencilset列表信息

一、查詢流程設計工做區模型列表

獲取列表方法：

List<Model> modelList = repositoryService.createModelQuery().list();
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Model的結構以下：

image

二、根據模型Id獲取模型信息

// ModelEditorJsonRestResource.java


@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;
  }
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三、新建模型

// NewModelPopupWindow.java

    ObjectMapper objectMapper = new ObjectMapper();
    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);
    Model modelData = repositoryService.newModel();
    
    ObjectNode modelObjectNode = objectMapper.createObjectNode();
    modelObjectNode.put(MODEL_NAME, (String) nameTextField.getValue());
    modelObjectNode.put(MODEL_REVISION, 1);
    String description = null;
    if (StringUtils.isNotEmpty((String) descriptionTextArea.getValue())) {
      description = (String) descriptionTextArea.getValue();
    } else {
      description = "";
    }
    modelObjectNode.put(MODEL_DESCRIPTION, description);
    modelData.setMetaInfo(modelObjectNode.toString());
    modelData.setName((String) nameTextField.getValue());
    
    repositoryService.saveModel(modelData);
    repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));
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四、刪除模型

repositoryService.deleteModel(modelData.getId());
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五、部署模型

// EditorProcessDefinitionDetailPanel.java
protected void deployModelerModel(final ObjectNode modelNode) {
    BpmnModel model = new BpmnJsonConverter().convertToBpmnModel(modelNode);
    byte[] bpmnBytes = new BpmnXMLConverter().convertToXML(model);
    
    String processName = modelData.getName() + ".bpmn20.xml";
    Deployment deployment = repositoryService.createDeployment()
            .name(modelData.getName())
            .addString(processName, new String(bpmnBytes))
            .deploy();

    ExplorerApp.get().getViewManager().showDeploymentPage(deployment.getId());
  }
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六、導入模型

參考這段代碼：

// ImportUploadReceiver.java
public class ImportUploadReceiver implements Receiver, FinishedListener, ModelDataJsonConstants {
  
  ...

  protected void deployUploadedFile() {
    try {
      try {
        if (fileName.endsWith(".bpmn20.xml") || fileName.endsWith(".bpmn")) {
          validFile = true;
            
          XMLInputFactory xif = XmlUtil.createSafeXmlInputFactory();
          InputStreamReader in = new InputStreamReader(new ByteArrayInputStream(outputStream.toByteArray()), "UTF-8");
          XMLStreamReader xtr = xif.createXMLStreamReader(in);
          BpmnModel bpmnModel = new BpmnXMLConverter().convertToBpmnModel(xtr);
          
          if (bpmnModel.getMainProcess() == null || bpmnModel.getMainProcess().getId() == null) {
            notificationManager.showErrorNotification(Messages.MODEL_IMPORT_FAILED, 
                i18nManager.getMessage(Messages.MODEL_IMPORT_INVALID_BPMN_EXPLANATION));
          } else {
          
            if (bpmnModel.getLocationMap().isEmpty()) {
              notificationManager.showErrorNotification(Messages.MODEL_IMPORT_INVALID_BPMNDI,
                  i18nManager.getMessage(Messages.MODEL_IMPORT_INVALID_BPMNDI_EXPLANATION));
            } else {
            
              String processName = null;
              if (StringUtils.isNotEmpty(bpmnModel.getMainProcess().getName())) {
                processName = bpmnModel.getMainProcess().getName();
              } else {
                processName = bpmnModel.getMainProcess().getId();
              }
              
              modelData = repositoryService.newModel();
              ObjectNode modelObjectNode = new ObjectMapper().createObjectNode();
              modelObjectNode.put(MODEL_NAME, processName);
              modelObjectNode.put(MODEL_REVISION, 1);
              modelData.setMetaInfo(modelObjectNode.toString());
              modelData.setName(processName);
              
              repositoryService.saveModel(modelData);
              
              BpmnJsonConverter jsonConverter = new BpmnJsonConverter();
              ObjectNode editorNode = jsonConverter.convertToJson(bpmnModel);
              
              repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));
            }
          }
        } else {
          notificationManager.showErrorNotification(Messages.MODEL_IMPORT_INVALID_FILE,
          		i18nManager.getMessage(Messages.MODEL_IMPORT_INVALID_FILE_EXPLANATION));
        }
      } catch (Exception e) {
        String errorMsg = e.getMessage().replace(System.getProperty("line.separator"), "<br/>");
        notificationManager.showErrorNotification(Messages.MODEL_IMPORT_FAILED, errorMsg);
      }
    } finally {
      if (outputStream != null) {
        try {
          outputStream.close();
        } catch (IOException e) {
          notificationManager.showErrorNotification("Server-side error", e.getMessage());
        }
      }
    }
  }
  
  protected void showUploadedDeployment() {
    viewManager.showEditorProcessDefinitionPage(modelData.getId());
  }
  
}
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七、導出模型

// EditorProcessDefinitionDetailPanel.java

protected void exportModel() {
    final FileResource stream = new FileResource(new File(""), ExplorerApp.get()) {
      
      private static final long serialVersionUID = 1L;

        @Override
        public DownloadStream getStream() {
          DownloadStream ds = null;
          try {
            
            byte[] bpmnBytes = null;
            String filename = null;
            if (SimpleTableEditorConstants.TABLE_EDITOR_CATEGORY.equals(modelData.getCategory())) {
              WorkflowDefinition workflowDefinition = ExplorerApp.get().getSimpleWorkflowJsonConverter()
              		.readWorkflowDefinition(repositoryService.getModelEditorSource(modelData.getId()));
              
              filename = workflowDefinition.getName();
              WorkflowDefinitionConversion conversion = 
                      ExplorerApp.get().getWorkflowDefinitionConversionFactory().createWorkflowDefinitionConversion(workflowDefinition);
              bpmnBytes = conversion.getBpmn20Xml().getBytes("utf-8");
            } else {
            	JsonNode editorNode = new ObjectMapper().readTree(repositoryService.getModelEditorSource(modelData.getId()));
              BpmnJsonConverter jsonConverter = new BpmnJsonConverter();
              BpmnModel model = jsonConverter.convertToBpmnModel(editorNode);
              filename = model.getMainProcess().getId() + ".bpmn20.xml";
              bpmnBytes = new BpmnXMLConverter().convertToXML(model);
            }
           
            ByteArrayInputStream in = new ByteArrayInputStream(bpmnBytes);
            ds = new DownloadStream(in, "application/xml", filename);
            // Need a file download POPUP
            ds.setParameter("Content-Disposition", "attachment; filename=" + filename);
          } catch(Exception e) {
            LOGGER.error("failed to export model to BPMN XML", e);
            ExplorerApp.get().getNotificationManager().showErrorNotification(Messages.PROCESS_TOXML_FAILED, e);
          }
          return ds;
        }
    };
    stream.setCacheTime(0);
    ExplorerApp.get().getMainWindow().open(stream);
  }
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八、查詢左側stencilset列表信息

// StencilsetRestResource.java

public class StencilsetRestResource {
  
  @RequestMapping(value="/editor/stencilset", method = RequestMethod.GET, produces = "application/json;charset=utf-8")
  public @ResponseBody String getStencilset() {
    InputStream stencilsetStream = this.getClass().getClassLoader().getResourceAsStream("stencilset.json");
    try {
      return IOUtils.toString(stencilsetStream, "utf-8");
    } catch (Exception e) {
      throw new ActivitiException("Error while loading stencil set", e);
    }
  }
}
複製代碼
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