如何在使用reader.eachLine讀取BufferedInputStream時保持行號計數？

Question

當使用eachLine讀取BufferedInputStream時，如何跟蹤我所在的行號？

def input = new GZIPInputStream(new FileInputStream(f)) 
def reader = new BufferedReader(new InputStreamReader(input)) 
reader.eachLine { 
    line ->if(line.contains(searchString)){ 
     println "${f} - ${line}" 
    } 
} 

Answer 1

您傳遞給eachline的閉包也可以帶2個參數。首先是數據行，第二行是行號。

.... 
.... 
reader.eachLine { line, lineNumber -> 
    if(line.contains(searchString)) { 
     println "${lineNumber} - ${line}" 
    } 
} 

請參閱GDK Doc for InputStream eachLine method。