代码改造实录-- 分解大函数，并以新建函数名解释其功能

原来的代码：

OrderInfo orderForm = this.orderInfoRepository.findByOrderId(orderNo);
if (orderForm != null && orderForm.getOrderStatus() == 0) {
    MakeAnAppointment make = this.makeAnAppointmentRepository.findByOrderId(orderForm.getId());

    if (orderForm.getOrderType() == 0) { 
        make.setOrderStatus(1); // 成功
        String extra = orderForm.getExtra();
        OrderPlus doctorVisit = JSON.parseObject(extra, OrderPlus.class);
        Integer id = doctorVisit.getId();
        OrderPlus d = this.doctorVisitRepository.findById(id).get();
        d.setMakeAnAppointment(doctorVisit.getMakeAnAppointment() + 1);
        this.doctorVisitRepository.save(d);

        JSONObject params1 = new JSONObject();
        params1.put("title", "加号提醒");
        params1.put("content", orderForm.getUserName() + "申请了你的加号，请及时处理");
        JSONObject params2 = new JSONObject();
        DoctorInfo doctorDetail = this.doctorDetailRepository.findById(orderForm.getDoctorId()).get();
        UserAccount user2 = this.userRepository.findById(doctorDetail.getAccountId()).get();
        params2.put("userId", user2.getUserName());
        params2.put("msg", JSON.toJSONString(params1));
        HttpUtils.post(this.url + "/api/im/send", params2);

        this.makeAnAppointmentRepository.save(make);
    } else if (orderForm.getOrderType() == 1) { 
        make.setOrderStatus(1);
        this.makeAnAppointmentRepository.save(make);
    } else if (orderForm.getOrderType() == 2) { 
        make.setOrderStatus(1);
        this.makeAnAppointmentRepository.save(make);

    } else {
        OrderAnnualFee fee = new OrderAnnualFee();
        BeanUtils.copyProperties(orderForm, fee);
        annualFeeService.saveAnnualFee(fee);
        orderService.saveLog(orderForm.getOrderId(), orderForm.getUserName(), orderForm.getUserName() + "会员缴费");
    }
    orderForm.setPayType("wx");
    orderForm.setPayTime(Long.valueOf(System.currentTimeMillis()));
    orderForm.setOrderStatus(1);
    this.orderInfoRepository.save(orderForm);
}

修改后代码：

OrderInfo orderForm = this.orderInfoRepository.findByOrderId(orderNo);
if (orderForm != null && orderForm.getOrderStatus() == 0) {

    if (orderForm.getOrderType() == 0) {
        String extra = orderForm.getExtra();
        OrderPlus doctorVisit = JSON.parseObject(extra, OrderPlus.class);
        orderPlusService.increaseAppointment(doctorVisit.getId());

        MessageSenderBiz.sendLovePlusToDoctor(orderForm.getUserName(), orderForm.getDoctorName(), this.url);
        appointmentService.changeAppointmentStatus(orderForm.getId(), 1);
    } else if (orderForm.getOrderType() == 1) { 
        appointmentService.changeAppointmentStatus(orderForm.getId(), 1);
    } else if (orderForm.getOrderType() == 2) { 
        appointmentService.changeAppointmentStatus(orderForm.getId(), 1);
    } else {
        OrderAnnualFee fee = new OrderAnnualFee();
        BeanUtils.copyProperties(orderForm, fee);
        annualFeeService.saveAnnualFee(fee);
        orderService.saveLog(orderForm.getOrderId(), orderForm.getUserName(), orderForm.getUserName() + "会员缴费");
    }
    orderForm.setPayType("wx");
    orderForm.setPayTime(Long.valueOf(System.currentTimeMillis()));
    orderForm.setOrderStatus(1);
    this.orderInfoRepository.save(orderForm);
}

修改后，将发送信息功能和更新预约状态两个功能独立出来，并移交至各自的功能类中。这样可以：1、增加代码复用，方法功能更清晰；2、符合类的封装思想，自己的事情自己办；3、原来的函数更简洁易读。