我想删除某些日志条目以解析文件。但是,在运行 BufferedReader 和其他导入的函数和库时,我使用 .replaceAll 方法运行的代码出现错误。我该如何删除“rule_uid:{C1336766-9489-4049-9817-50584D83A245};”而不会导致错误?
日志文件:
Jan 1 22:54:17 drop %LOGSOURCE% >eth1 rule: 7; rule_uid: {C1336766-9489-4049-9817-50584D83A245};
Jan 1 22:54:22 drop %LOGSOURCE% >eth1 rule: 7; rule_uid: {C1336766-9489-4049-9817-50584D83A245};
Jan 1 22:54:23 drop %LOGSOURCE% >eth1 rule: 7; rule_uid: {C1336766-9489-4049-9817-50584D83A245};
Jan 1 22:54:41 drop %LOGSOURCE% >eth1 rule: 7; rule_uid: {C1336766-9489-4049-9817-50584D83A245};
错误:
"Exception in thread "main" java.util.regex.PatternSyntaxException: Illegal repetition near index 9
rule_uid: {C1336766-9489-4049-9817-50584D83A245};" (which is at the .replaceAll() method for rule_uid column)
代码:
try {
File file = new File("filename");
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = "", oldtext = "";
while ((line = reader.readLine()) != null) {
oldtext += line + "\r\n";
}
reader.close();
// replace a word in a file
String newtext = oldtext.replaceAll("%LOGSOURCE% >eth1 rule: 7;", "");
String newtext1 = oldtext.replaceAll("rule_uid: {C1336766-9489-4049-9817-50584D83A245};", "");
//To replace a line in a file
FileWriter writer = new FileWriter("newfilename");
writer.write(newtext);
writer.write(newtext1);
writer.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
最佳答案
第二次调用 replaceAll()
时,输入字符串中有特殊字符,这些字符被解释为正则表达式语法的一部分,而不是要替换的纯文本。一旦我在 IntelliJ 中转义了这些特殊字符,编译器错误就消失了。
改变这个:
String newtext = oldtext.replaceAll("%LOGSOURCE% >eth1 rule: 7;", "");
String newtext1 = oldtext.replaceAll("rule_uid: {C1336766-9489-4049-9817-50584D83A245};", "");
对此:
String newtext = oldtext.replaceAll("%LOGSOURCE% >eth1 rule: 7;", "");
String newtext1 = oldtext.replaceAll("rule_uid: \\{C1336766-9489-4049-9817-50584D83A245\\};", "");
我所做的只是用两个前导反斜杠来转义大括号,例如\\{
更新:
您的代码中还有其他一些逻辑问题。这是我建议您使用的完整代码:
try {
File file = new File("filename");
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = "", oldtext = "";
while ((line = reader.readLine()) != null) {
oldtext += line + "\r\n";
}
reader.close();
// replace a word in a file
oldtext = oldtext.replaceAll("%LOGSOURCE% >eth1 rule: 7;", "");
oldtext = oldtext.replaceAll("rule_uid: \\{C1336766-9489-4049-9817-50584D83A245\\};", "");
FileWriter writer = new FileWriter("newfilename");
// the entire file is contained within the String 'oldtext'
// you only need one write operation to output it
writer.write(oldtext);
writer.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
关于java - 如何从 .log 文件中删除某些列/元素?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32367408/