有时压测时,需要从日志文件中提取每行指定字段的值(S_KEYWORD_COMPLETE_NEW字段),如下:
?S_KEYWORD_COMPLETE_NEW=%E7%94%9F%E4%BA%A7&NewId=60773611
截取策略:以 "S_KEYWORD_COMPLETE_NEW="为开头标识,以"S_KEYWORD_COMPLETE_NEW="字段值后第一个"&"为结束。
以下为具体java代码
import java.io.*; /** * @Author: jiajun.du * @Date: 2021/8/3 18:00 */ public class ExtractFieldValues { public static void main(String[] args) { try { BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("D:\\50.130\\onlyuri.log"), "GB2312"));//源日志文件 BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:\\50.130\\onlyuri.txt"), "GB2312"));//存放截取值的新文件 StringBuffer sb = new StringBuffer(); String b = ""; int num =0;//读取行数控制 try { while ((b = br.readLine()) != null && num <80000) { sb.append(b); String s = sb.toString(); String strNew = s.substring(s.indexOf("S_KEYWORD_COMPLETE_NEW=") + 23, s.length());//每行截取起始标识 String key = strNew.substring(0, strNew.indexOf("&"));//每行截取结束标识 //String keyNew = unicodeToString(key); bw.write(key+"\n");//写入文件并换行 num++; sb.delete(0,sb.length());//清空数据 } bw.flush(); } catch (IOException e) { e.printStackTrace(); } try { br.close(); bw.close(); } catch (IOException e) { e.printStackTrace(); } } catch (UnsupportedEncodingException | FileNotFoundException e) { e.printStackTrace(); } } }