异常：java.sql.SQLException: Before start of result set
原因：在ResultSet中，rs.next()是指游标移向下一行，如果使用像rs.getInt() rs.getString()等方法前没有加上rs.next()就会出现异常，获取不到结果集的值。
解决办法：在使用rs获取值前，要加rs.next()
if(rs.next()){
number= rs.getInt(1);
}
或者这样~
while(rs.next()){
int id =rs.getInt("id");
String name=rs.getString("name");
String price=rs.getString("price");
String image=rs.getString("image");
}
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