1、在JSP页面的<a>标签中将href指向对删除业务进行操作的doDeleteServlet，并传递需要删除的行的id

<a href="doDeleteServlet?id=当前行数据的id">删除</a>   
<form>
<table  width="95%" border="1" cellpadding="2" cellspacing="1" style="table-layout:fixed;">
    <caption>用户信息</caption>
        <tr>
            <td width="80px" align="center" nowrap>用&nbsp;户&nbsp;id&nbsp;</td>
            <td width="150px" nowrap>地&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;址</td>
            <td width="180px" nowrap>&nbsp;email&nbsp;</td>
            <td width="100px" nowrap>用&nbsp;户&nbsp;名</td>
            <td width="100px" nowrap>用&nbsp;户&nbsp;密&nbsp;码</td>
            <td width="100px" nowrap>手&nbsp;机&nbsp;号&nbsp;码</td>
            <td width="100px" align="center" nowrap>用&nbsp;户&nbsp;类&nbsp;型</td>
            <td width="80px" align="center" nowrap>操&nbsp;&nbsp;&nbsp;作</td>
        </tr>
    <c:forEach items="${userList}" var="users" step="1" varStatus="xh">
        <tr>
            <td >${users.userId}</td>
            <td>${users.address}</td>
            <td>${users.email}</td>
            <td>${users.userName}</td>
            <td>${users.passWd}</td>
            <td>${users.phone}</td>
            <td>${users.type}</td>
            <td><a href="<%=request.getContextPath()%>/UserDeleteServlet?id=${users.userId}">删 除</a></td>
        </tr>
    </c:forEach>

</table>
</form>

2、在doDeleteServlet的doGet()方法中，调用dao中的删除方法
3、删除后，调用“取列表的”servlet，该servlet调用dao中的查询方法， 最终转到就最开始的jsp页面

@WebServlet("/UserDeleteServlet")
public class UserDeleteServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            System.out.println(request.getParameter("id")+"-----------------");
           int result = UsersDao.delete(request.getParameter("id"));
            if(result>0){
                System.out.println(result+"-----------操作成功");
             }else{
                 System.out.println("操作失败");
             }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        doPost(request,response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String page = null;
        try {
            request.setAttribute("userList", UsersDao.getAllUsers());
        } catch (SQLException e) {
            e.printStackTrace();
        }
        page = "/user/usersForeach.jsp";
        getServletContext().getRequestDispatcher(page).forward(request,response);
    }
}