JAVA-从txt文件进行数据的读取与写入

public List<ServiceEvent> readSerListFromTXT(String fileName){

      List<ServiceEvent> serviceEventList = new ArrayList<ServiceEvent>();

      BufferedReader inputStream = null;

      boolean isFirstLine = true;

      try {

         inputStream = new BufferedReader(new FileReader(fileName));

         String line;

         while((line = inputStream.readLine()) != null){

            String[] nodeRow = line.split("\\s+");

            //EventType eventType, int eventId, double arriveTime, double holdTime, int src, int dst, int transmissionRate            ServiceEvent ser = new ServiceEvent();

            if (isFirstLine){

               isFirstLine = false;//第一行是说明，所以读的时候要跳过               continue;

            }

            for (int j = 0; j < nodeRow.length; j++) {

               switch (j){

                  case 0: {

                     if (nodeRow[j].equals("SERVICE_ARRIVAL")){

                        ser.setEventType(EventType.SERVICE_ARRIVAL);

                     }else if (nodeRow[j].equals("SERVICE_END")){

                        ser.setEventType(EventType.SERVICE_END);

                     }

                     break;

                  }

                  case 1: ser.eventId = Integer.parseInt(nodeRow[j]);break;

                  case 2: ser.setArriveTime(Double.parseDouble(nodeRow[j]));break;

                  case 3: ser.setHoldTime(Double.parseDouble(nodeRow[j]));break;

                  case 4: ser.setSrc(Integer.parseInt(nodeRow[j]));break;

                  case 5: ser.setDst(Integer.parseInt(nodeRow[j]));break;

                  case 6: ser.setTransmissionRate(Integer.parseInt(nodeRow[j]));break;

                  default:break;

               }

            }

            serviceEventList.add(ser);

         }

      } catch(Exception e){

         System.out.println(e);

      }

      return serviceEventList;

   }

   public void writeSerListToTXT(String fileName,List<ServiceEvent> serList){

      System.out.println(fileName);

      int rowNum = serList.size();

      int columnNum = 7;

      //EventType eventType, int eventId, double arriveTime, double holdTime, int src, int dst, int transmissionRate      try {

         FileWriter fw = new FileWriter(fileName);

         fw.write("eventType, eventId , arriveTime, holdTime, src, dst, transmissionRate"+"\n");

         for (int i = 0; i < rowNum; i++) {

            for (int j = 0; j < columnNum; j++){

               switch (j){

                  case 0: fw.write(serList.get(i).getEventType()+ "\t"); break;

                  case 1: fw.write(serList.get(i).getEventId()+ "\t"); break;

                  case 2: fw.write(serList.get(i).getArriveTime()+ "\t"); break;

                  case 3: fw.write(serList.get(i).getHoldTime()+ "\t"); break;

                  case 4: fw.write(serList.get(i).getSrc()+ "\t"); break;

                  case 5: fw.write(serList.get(i).getDst()+ "\t"); break;

                  case 6: fw.write(serList.get(i).getTransmissionRate()+ "\t"); break;

                  default: break;

               }

            }

            fw.write("\n");

         }

         fw.close();

      }

      catch (IOException e){

         e.printStackTrace();

      }

   }

JAVA-从txt文件进行数据的读取与写入

原文：https://www.cnblogs.com/Limer98/p/12682045.html