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If you use it as a global variable, you can only use StringBuffer, because spring mvc is not thread-safe. If it is only used as a local variable, use stringBuilder. The functions of the two of them are exactly the same, but the methods of StringBuffer are all synchronized methods, which improves performance under multi-threading. Worse than StringBuilder.

StringBuffer thread safe
StringBuilder thread unsafe

Except for the thread problem, I think everything else is the same

There is no thread safety issue when written in a method. . . Stringbuilder speed comparison, it is recommended to use it when operating large amounts of data