例:从 "[" 符号取到 "]" 符号
public static void main(String[] args) {
String str="ip:5.5.5.167 time:2018-04-09 08:39:31 0x0000000000000000 LL2778209216 [2018-04-09 08:39:31]"; String strs=str.substring(str.indexOf("[")+1, str.indexOf("]")); System.out.println(strs);}