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This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:-Wang Hailong (Suzhou Book Club, Wu Xiaobo)徐风拿着外套，快步走到玄关处。Let's think about another problem. We have placed a string of rules on each "chain", but some of these rules are very similar. For example, Class A rules filter IP or ports and Class B rules modify messages. At this time, can we put together the rules that realize the same function? We must be able to do so.It can be said that cancer is a chronic disease, and听到君上这么说，罗七欣然点头遵命，尽管他有不同的意见，但是君上的命令他是绝对不会违拗的。Therefore, the problems brought by XSS should be solved by XSS defense scheme.