java实现选中删除功能

分析：
通过form表单传递数据，删除数据根据id编号删除。
前台

 <a class="btn btn-primary" href="javascript:void(0);" id="delSelected">删除选中</a>

</div>
<form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post">
<table border="1" class="table table-bordered table-hover">
    <tr class="success">
        <th><input type="checkbox" id="firstCb"></th>
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>年龄</th>
        <th>籍贯</th>
        <th>QQ</th>
        <th>邮箱</th>
        <th>操作</th>
    </tr>
    <c:forEach items="${users}" var="user" varStatus="s">
        <tr>
            <td><input type="checkbox" name="uid" value="${user.id}"></td>
            <td>${s.count}</td>
            <td>${user.name}</td>
            <td>${user.gender}</td>
            <td>${user.age}</td>
            <td>${user.address}</td>
            <td>${user.qq}</td>
            <td>${user.email}</td>
            <td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findUserServlet?id=${user.id}">修改</a>&nbsp;
                <a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id});">删除</a></td>
        </tr>

    </c:forEach>
</table>
</form>
Js
<script>
    function deleteUser(id) {
        //用户安全提示
        if (confirm("您确定要删除吗？")){
          //访问的路径
            location.href=" ${pageContext.request.contextPath}/delUserServlet?id="+id;
        }
    }
    window.οnlοad=function () {
        //给删除选中按钮添加单击事件
        document.getElementById("delSelected").οnclick=function () {
            if (confirm("您确定要删除选中条目吗？"))
                //表单提交
                document.getElementById("form").submit();
        }

        //1.获取第一个cb
        document.getElementById("firstCb").οnclick=function () {
            //获取下表所有的cb
            var cbs=document.getElementsByName("uid");
            //遍历
            for (var i=0;i<cbs.length;i++){
                //设置这些cbs[i]的checked状态=firstCb.checked
                cbs[i].checked =this.checked;
            }
        }
    }


</script>

后台

Servlet

 @WebServlet("/delSelectedServlet")
 public class DelSelectedServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    //获取所有id
    String[] ids=request.getParameterValues("uid");

    //调用service删除
    UserService service=new UserServiceImpl();
    service.delSelectedUser(ids);
    
    //跳转查询Servlet
    response.sendRedirect(request.getContextPath()+"/userListServlet");
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    this.doPost(request, response);
}

}

Service

 public void delSelectedUser(String[] ids) {
 
 //遍历数组
for (String id:ids){
     //调用dao删除
    dao.deleteUser(Integer.parseInt(id));
  }

}

Dao

 public void updateUser(User user) {
String sql="update userms set name=?,age=?,gender=?,address=?,qq=?,email=? where id=?";

               //执行sq
               template.update(sql,user.getName(),user.getAge(),user.getGender(),user.getAddress(),user.getQq(),user.getEmail(),user.getId());
 }