Java Grep Library [英] Java Grep Library

问题描述

有什么好的，简单的Java Grep Library？我并不反对本地代码或脚本，我会这样做，但出于我的目的，吞吐量并不是什么大问题，并且将它全部放在一个整洁的包中会很好。

更新：对不起。我知道java.regex，现在我只是相当忙碌和累了。我正在寻找的是有效地将java正则表达式与经历一组文件并重写它们的东西。我承认，这不会太难写。我只是好奇，如果这已经存在。

解决方案

我不知道一个复杂的grep库强壮的文字，但你是对的：写作不难。
我建议结合使用 commons-io 和 String.matches（someRegex）：

$ b $

  public class Grep extends DirectoryWalker 
 {
 public Grep（）{
 super（）; 
 
 $ b $ public清单（File startDirectory）{
 List results = new ArrayList（）; 
 walk（startDirectory，results）; 
返回结果; 
 
 $ b保护布尔值handleDirectory（文件目录，
 int depth，集合结果）{
 //决定是否为递归搜索处理（子）目录
返回true; 
 
 
 protected void handleFile（File file，int depth，Collection results）
 {
 LineIterator it = FileUtils.lineIterator（file，UTF-8） ; 
尝试{
 while（it.hasNext（））{
 String line = it.nextLine（）; 
 if（line.matches（myRegEx））{
 results.add（file）; 
 
 
 $ b finally {LineIterator.closeQuietly（it）;} 
} 
} 
  

---

更新 Marco指出 Unix4j 这是一个非常有趣的库，它模拟了使用Java方法链接的unix流水线 | 。支持 grep 以及 cat，cd，cut，echo，find，grep，head，ls，sed，sort，tail，uniq，wc ，驳船。

Is there any good, simple Java Grep Library? I'm not opposed to native code, or scripting, and I'll do it, but for my purposes, throughput is not a huge deal, and it would be nice to have it all in one tidy package.

UPDATE: Sorry. I know about java.regex, I just happen to be fairly busy and tired right now. What I'm looking for is something that efficiently combines java regex with going through a set of files and rewriting them. This wouldn't be too hard to write, I admit. I was just curious if that exists already.

解决方案

I'm not aware of a sophisticated grep librarystrong text, but you are right: it's not hard to write. I suggest a combination of commons-io and String.matches(someRegex):

public class Grep extends DirectoryWalker
{
    public Grep(){
        super();
    }

    public List clean(File startDirectory){
      List results = new ArrayList();
      walk(startDirectory, results);
      return results;
    }

    protected boolean handleDirectory(File directory,
                                      int depth, Collection results){
      // Decide if a (sub) directory will be handled for recursive search
      return true;
    }

    protected void handleFile(File file, int depth, Collection results)
    {
        LineIterator it = FileUtils.lineIterator(file, "UTF-8");
        try{
            while (it.hasNext()){
                String line = it.nextLine();
                if(line.matches("myRegEx")){
                    results.add(file);
                }
            }
         }
         finally {LineIterator.closeQuietly(it);}
    }
}

---

Update Marco pointed out Unix4j which is a quite interesting library which emulates the unix pipelining | with Java method chaining. grep is supported as well as cat, cd, cut, echo, find, grep, head, ls, sed, sort, tail, uniq, wc, barges.

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