您需要创建一个本地变量 String nbsp = " " 或者简单使用message.replaceAll(" ", " "); 这也可以工作: message.replaceAll("\u00a0"," ");
尝试: String message = "a b c"; String nbsp = " "; message = message.replaceAll(nbsp, " "); System.out.println(message); 输出:"a b c"