使用Java正则表达式分析处理日志

package test.test; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileWriter; import java.io.InputStream; import java.io.InputStreamReader; import java.util.regex.Matcher; import java.util.regex.Pattern; import cn.xddai.chardet.CharsetDetector; public class LogProcess2 { public static void main(String[] args) throws Exception { BufferedReader reader = null; BufferedWriter writer = null; try { File file = new File("D:\\Processor38.log"); InputStream inputStream = new FileInputStream("D:\\Processor38.log"); CharsetDetector charDect = new CharsetDetector(); String[] codes = charDect.detectChineseCharset(inputStream); String code = codes[0]; InputStream is = new FileInputStream(file); InputStreamReader isr = new InputStreamReader(is, code); reader = new BufferedReader(isr); Pattern p2 = Pattern.compile(">rfc\\.remotehost=\\d+\\.\\d+\\.\\d+\\.\\d+"); Pattern p = Pattern.compile(">rfc perform cost time:\\s\\d+\\sms"); File f = null; String str = null; StringBuilder sb = new StringBuilder(); boolean bool = false; while (null != (str = reader.readLine())) { Matcher m2 = p2.matcher(str); boolean b2 = m2.find(); if (b2) { sb.delete(0, sb.length()); bool = b2; //保存第一次匹配的正则表达式结果 sb.append(str); } else if (bool) { sb.append("\r\n"); sb.append(str); } Matcher m = p.matcher(str); boolean b = m.find(); if (b) { int i = str.indexOf(">rfc perform cost time:"); int first = i + ">rfc perform cost time:".length(); int last = str.indexOf("ms"); String s = str.substring(first, last); System.out.println("time---" + s); int time = Integer.parseInt(s.trim()); if (time > 30) { bool = false; //第二次匹配后修改bool的值，为下一次的第一次正则表达式匹配使用 sb.append("\r\n"); f = new File("D:\\Processor38_analyzes.log"); writer = new BufferedWriter(new FileWriter(f, true)); writer.write(sb.toString()); writer.newLine(); writer.flush(); } } System.out.println("----==" + b); } } catch (Exception e) { e.printStackTrace(); } finally { reader.close(); writer.close(); } } }