使用Groovy在文件记录中插入字段

Question

我在Groovy中有以下代码。基本上我尝试的是读取输入记录集并将它们合并为一个或多个具有共同组合键的记录。

组合键如下所示。在读完输入文件后，我将密钥和字段写入HashMap（参见代码）。但是现在我需要检查输入文件中的键，如果看到键，那么我已经写了输出记录，否则我只需要编写输出记录而不合并。我的问题

在输出记录中插入字段的命令是什么？。

import java.util.Properties;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;


for( int i = 0; i < dataContext.getDataCount(); i++ ) {
  InputStream is = dataContext.getStream(i);
  Properties props = dataContext.getProperties(i);
  reader = new BufferedReader(new InputStreamReader(is)); 


 /* This is how to declare HashMap */
  def forcastMap = [:]

 String Key;   
 String Shipfrom = "";
 String Item = "";
 String Fcast = "";
 String Shipto = "";
 String Planned_Arrival_Date = "";
 String Qty = "";
 String PrevKey = "";

 List<String> line = null

 while ((line = reader.readLine()) != null) 
 {
        if(line.length() > 20) //Make sure it is a data line so we can do substring manipulation
        {    
           Shipfrom = line.substring(35,12)  
           Item = line.substring(50,50)
           Fcast = line.substring(10,50)
           Shipto = line.substring(75,10)
           Planned_Arrival_Date = line.substring(85,8)
           Qty = line.substring(90,12)
           Key = (Shipfrom + Item + Fcast + Shipto)
           forcastMap.put(Key,Planned_Arrival_Date,Qty)
           if key != PrevKey {

           }
         }

     }      

 //dataContext.storeStream(is, props);

}