我认为这应该对您有所帮助。基本上，您的CSV杂乱无章。下面是我安排您的csv的代码

   public static void main(String[] args) throws FileNotFoundException, UnsupportedEncodingException {

        PrintWriter writer = new PrintWriter("file.txt", "UTF-8");
            try{

              //Create object of FileReader
              FileReader inputFile = new FileReader("csv.txt");

              //Instantiate the BufferedReader Class
              BufferedReader bufferReader = new BufferedReader(inputFile);

              //Variable to hold the one line data
              String line;
              String date="";String org ="";String student ="";
              // Read file line by line and print on the console
              while ((line = bufferReader.readLine()) != null)   {
                  if(line.contains("1.")){
                      if(date!="" || org!=""){
                          writer.println(date+","+org+","+student);
                          student ="";
                       }
                         date = line.substring(2);
                        }else if(line.contains("2.")){
                            org = line.substring(2);

                      }else{
                            line = "("+line+")";
                          student += line+",";
                  }

                    System.out.println(line);
              }
              writer.println(date+","+org+","+student);
              //Close the buffer reader
              bufferReader.close();
      }catch(Exception e){
        System.out.println("Error while reading file line by line:" + e.getMessage());                      
   }
       writer.close();
  }

这是您将为此获得的输出

   10/09/2016, cycling club,(3. sam, 1000, oklahoma),(   henry, 1001, california),(   bill, 1002, NY),
   11/15/2016, swimming club,(3. jane, 9001, georgia),(   elizabeth, 9002, lousiana),

我正在从csv.txt中读取文件。while循环遍历文本文件的每一行。所有字段都存储在变量中。下一个日期到来时，我将它们全部写入输出文件。在while循环终止后，csv的最后一行被写入文件。