以前犯过的一个小错误，不过忘记怎么修改了，所以还是记录下来好一点

严重: Servlet.service() for servlet [appServlet] in context with path [/item] threw exception [Request processing failed; nested exception is java.lang.NumberFormatException: For input string: "1 "] with root cause
java.lang.NumberFormatException: For input string: "1 "

经过查找我发现地址栏那里的page后面有错

那是分页的属性，然后找了很久都没发现有什么错，最后还是找到了这个page属性后面多了个空格

希望以后要记住，没用的空格要删掉

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