Question

我需要提取字符串的目录，示例如下：

222.77.201.211 - - [20/Sep/2013:00:10:23 +0800] "GET /mapreduce-nextgen/hadoop-internals-mapreduce-reference/ HTTP/1.1" 200 28664 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)"
220.181.89.164 - - [20/Sep/2013:00:10:25 +0800] "GET /mapreduce/hadoop-capacity-scheduler HTTP/1.1" 301 390 "-" "Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)"
175.44.54.185 - - [20/Sep/2013:00:10:25 +0800] "GET /mapreduce-nextgen/apache-hadoop-2-0-3-published HTTP/1.1" 301 439 "http://dongxicheng.org/mapreduce-nextgen/apache-hadoop-2-0-3-published/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)"
175.44.54.185 - - [20/Sep/2013:00:10:25 +0800] "GET /search-engine/scribe-intro/ HTTP/1.1" 200 21578 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)"
112.111.174.38 - - [20/Sep/2013:00:10:30 +0800] "GET /structure/segment-tree HTTP/1.1" 301 414 "http://dongxicheng.org/structure/segment-tree/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)"
112.111.174.38 - - [20/Sep/2013:00:10:30 +0800] "GET /structure/segment-tree HTTP/1.1" 301 414 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)"
222.77.201.211 - - [20/Sep/2013:00:10:31 +0800] "GET /mapreduce-nextgen/apache-hadoop-2-0-3-published/ HTTP/1.1" 200 23438 "http://dongxicheng.org/mapreduce-nextgen/apache-hadoop-2-0-3-published/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)"

预期输出为：

/mapreduce-nextgen/hadoop-internals-mapreduce-reference/
/mapreduce/hadoop-capacity-scheduler
/mapreduce-nextgen/apache-hadoop-2-0-3-published
等...

我认为可能需要正则表达式。提前谢谢！

Answer 1

如果它始终位于GET和HTTP之间，最简单的正则表达式就是这个：

GET (.*?) HTTP

在此证明：Regex101

在Java中，代码应该类似于以下代码：

Pattern p = Pattern.compile("GET (.*?) HTTP");
Matcher m = p.matcher(string);

编辑：不要忘记将\放在字符串中的每个"之前，否则它将被解释为字符串的结尾。

String str = "222.77.201.211 - - [20/Sep/2013:00:10:23 +0800] \"GET /mapreduce-nextgen/hadoop-internals-mapreduce-reference/ HTTP/1.1\" 200 28664 \"-\" \"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)\"";

带有上述字符串的输出将为/mapreduce-nextgen/hadoop-internals-mapreduce-reference/。

Answer 2

String toInspect = "112.111.186.210 - - [20/Sep/2013:00:10:22 +0800] \"GET /structure/segment-tree HTTP/1.1\" 301 414 \"-\" \"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)\"";
String directory = StringUtils.substringBetween(toInspect ,"GET ", " HTTP");

Answer 3

好的，所以上面的答案会起作用，可能会更好，但我是用.indexOf()做的。文本中的第一行读物并不完全是我在Hadoop处理时所做的，但为了简洁起见，它就是。

Text value = "112.111.186.210 - - [20/Sep/2013:00:10:22 +0800] \"GET /structure/segment-tree HTTP/1.1\" 301 414 \"-\" \"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)\"","GET ", " HTTP"


     int idx = value.toString().indexOf("GET");
     int idy = value.toString().indexOf("HTTP/1");
     ip.set(value.toString().substring(idx, idy).trim());

从字符串中提取目录

3 个答案: