平台流程退回功能

/**
     * 驳回流程到上一步节点
     * @return
     * @throws Exception
     * @Description：【Json格式】
     */
    @GET
    @POST
    @Path("back")
    @Produces(MediaType.APPLICATION_JSON)
    public Response  back() throws Exception {
        ZvanFLowResult zvanFLowResult = zvanFlowResource.back(request,response);
        if(zvanFLowResult!=null){
            return Response.status(200).entity(zvanFLowResult).build();
        }else{
            return Response.status(500).build();
        }
    }

public ZvanFLowResult back(HttpServletRequest request,
                HttpServletResponse response) {
            ZvanFLowResult result = new ZvanFLowResult();
            try {
                String taskId = request.getParameter("taskId");
                String runId = request.getParameter("runId");
                  
                if(StringUtils.isEmpty(taskId) && StringUtils.isEmpty(runId)){
                    result.setStatus(ZvanFLowResult.STATUS_ERROR);
                    result.setMsg("至少传入taskId或者runId值!");
                    return result;
                }
                  
                if(StringUtils.isEmpty(taskId) && StringUtils.isNotEmpty(runId)){
                    List<TaskInfo> taskInfos = wps.getTaskInfoByRunId(runId);
                    if(taskInfos!=null && taskInfos.size()==1){
                        taskId = taskInfos.get(0).getTaskId();
                    }else{
                        result.setStatus(ZvanFLowResult.STATUS_ERROR);
                        if(taskInfos.isEmpty()){
                            result.setMsg("该流程里没有活动的节点！");
                        }else
                        if(taskInfos.size()>1){
                            result.setMsg("该流程里有多个活动的节点！无法通过流程实例ID（runId）进行流转。result的值为对应的多任务信息，可选择其一，通过taskId进行流转。");
                            result.setResult(taskInfos);
                        }
                        return result;
                    }
                }
                Boolean  isok = wps.reject(taskId);
                  
                if(isok){
                    result.setStatus(ZvanFLowResult.STATUS_OK);
                    result.setMsg(ZvanFLowResult.MSG_OK);
                }else{
                    result.setStatus(ZvanFLowResult.STATUS_ERROR);
                    result.setMsg(ZvanFLowResult.MSG_ERROR);
                      
                }
              
            } catch (Exception e) {
                result.setStatus(ZvanFLowResult.STATUS_ERROR);
                result.setMsg(e.getMessage());
                e.printStackTrace();
            }
            return result;
        }

public  static final Integer STATUS_OK =1;//成功
    public  static final Integer STATUS_ERROR =0;//失败
    public  static final String MSG_OK ="操作成功";//操作成功
    public  static final String MSG_ERROR ="操作失败";//操作成功
    private Integer status = STATUS_OK;
    private String msg = "OK";
    private Object result = null;
      
    public Integer getStatus() {
        return status;
    }
    public void setStatus(Integer status) {
        this.status = status;
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public Object getResult() {
        return result;
    }
    public void setResult(Object result) {
        this.result = result;
    }