refactor(工作流流程): 新增读取xml文件接口，替换原流程定义中的接口。

ruoyi-system/src/main/java/com/ruoyi/workflow/service/IWfProcessService.java

@@ -43,6 +43,12 @@ public interface IWfProcessService {
      */
     void startProcessByDefKey(String procDefKey, Map<String, Object> variables);
 
+    /**
+     * 读取xml文件
+     * @param processDefId 流程定义ID
+     */
+    String queryBpmnXmlById(String processDefId);
+
     /**
      * 查询流程任务详情信息
      * @param procInsId 流程实例ID

ruoyi-system/src/main/java/com/ruoyi/workflow/service/impl/WfProcessServiceImpl.java

@@ -189,6 +189,20 @@ public class WfProcessServiceImpl extends FlowServiceFactory implements IWfProce
         }
     }
 
+    /**
+     * 读取xml文件
+     * @param processDefId 流程定义ID
+     */
+    @Override
+    public String queryBpmnXmlById(String processDefId) {
+        InputStream inputStream = repositoryService.getProcessModel(processDefId);
+        try {
+            return IoUtil.readUtf8(inputStream);
+        } catch (IORuntimeException exception) {
+            throw new RuntimeException("加载xml文件异常");
+        }
+    }
+
     /**
      * 流程详情信息
      *