怎么在jsp的数据库的表添加一列序号1，2，3顺序排列，用下面的代码

用while(rs.next())写，例子
<%
while (rs.next()) {
int i =1;

int empno = rs.getInt(1);
String ename = rs.getString(2);
String job = rs.getString(3);
float sal = rs.getFloat(4);
java.util.Date date = rs.getDate(5);
%>

<%=i%> <%=empno%> <%=ename%> <%=job%> <%=sal%> <%=date%> <%}%>

jsp页面加上序号？

<%
i=0;
while (rs.next()) {
i++;
int empno = rs.getInt(1);
String ename = rs.getString(2);
String job = rs.getString(3);
float sal = rs.getFloat(4);
java.util.Date date = rs.getDate(5);
%>
<%=i%> <%=empno%> <%=ename%> <%=job%> <%=sal%> <%=date%> <%}%>

int i =1;放在while循环语句前面,循环里面i++即可。