/**添加流程模型并返回modelId
     * @param process_id        //流程唯一标识key
     * @param process_author    //流程作者
     * @param name              //流程名称
     * @param modelname         //模型名称
     * @param description       //模型描述
     * @param category          //模型分类
     * @from  fhadmin.cn
     * @throws UnsupportedEncodingException
     */
    protected String createModel(String process_id,String process_author,String name,String modelname,String description,String category) throws UnsupportedEncodingException{
        
        ObjectMapper objectMapper = new ObjectMapper();
        ObjectNode editorNode = objectMapper.createObjectNode();
        editorNode.put("id", "canvs");
        editorNode.put("resourceId", "canvs");
        ObjectNode stencilSetNode = objectMapper.createObjectNode();
        stencilSetNode.put("namespace", "http://b3mn.org/stencilset/bpmn2.0#");     //命名空间(禁止修改)
        stencilSetNode.put("author", "fhadmin.cn");                                         //流程节点作者
        editorNode.set("stencilset", stencilSetNode);
        ObjectNode propertiesNode = objectMapper.createObjectNode();
        propertiesNode.put("process_id",process_id);                                //流程唯一标识
        propertiesNode.put("process_author",process_author);                        //流程作者
        propertiesNode.put("name",name);                                            //流程名称
        editorNode.set("properties", propertiesNode);
        
        ObjectNode modelObjectNode = objectMapper.createObjectNode();
        modelObjectNode.put("name", modelname);                 //模型名称
        modelObjectNode.put("revision", 1);                     //模型版本
        modelObjectNode.put("description", description);        //模型描述
        Model modelData = repositoryService.newModel();
        modelData.setCategory(category);                        //模型分类
        modelData.setDeploymentId(null);
        modelData.setKey(null);
        modelData.setMetaInfo(modelObjectNode.toString());
        modelData.setName(modelname);                           //模型名称
        modelData.setTenantId("");
        modelData.setVersion(1);
        
        repositoryService.saveModel(modelData);                 //保存模型,存储数据到表：act_re_model 流程设计模型部署表
        repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));//保存资源,存储数据到表：act_ge_bytearray 二进制数据表
        
        return modelData.getId();
    }