java grok pattern

 파일에서 line by line 으로 문자열 리스트를 읽어온 후 해당 문자열 리스트들을 Grok 패턴의 정의에 따라 문자열 리스트 맵을 구성 할 수있는 함수이다.

public List<Map<String,String>> makeResultList(List<String> strList, String expression)throws Exception 

{

List<Map<String,String>> resultList = new ArrayList<Map<String,String>>();

final GrokDictionary dictionary = new GrokDictionary();

dictionary.addBuiltInDictionaries();

dictionary.bind();

Grok compiledPattern = dictionary.compileExpression(expression);

if(strList !=null && !expression.isEmpty())

{

for (String str : strList) 

{

Map<String,String> strMap = null;

try

{

strMap = compiledPattern.extractNamedGroups(str);

if(strMap != null)

{

resultList.add(strMap);

}

}

catch(Exception e)

{

System.out.println(e+"\n"+str);

throw new Exception(e);

}

}

}

return resultList;

}

사용법:

final String strTmp= "1234567 - israel.ekpo@massivelogdata.net none 1789 Hello Grok";

final String expression = "%{EMAIL:username} %{USERNAME:password} %{INT:yearOfBirth}";

final GrokDictionary dictionary = new GrokDictionary();

dictionary.addBuiltInDictionaries();

dictionary.bind();

    List<String> testList = new ArrayList<String>();

    testList.add(strTmp);

List<Map<String,String>> list = new ArrayList<Map<String,String>>();

list = makeResultList(testList, expression);

출처: http://stackoverflow.com/questions/19565755/how-to-parse-using-grok-from-java-is-there-any-example-available