Web -删除用户信息,并返回删除后的用户信息页面.

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_42986107/article/details/83119828

DelServlet.java

@WebServlet("/delete")
public class DelServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html; charset=utf-8");
        /*
            删除指定id的用户信息.
         */
        // 获取到用户的id.
        String id = request.getParameter("id");

        // 创建UserService对象 , 并调用其删除方法.
        UserService us = new UserService();
        us.deleById(id);

        // 删除成功之后 , 重定向到findAll页面 , 更新删除后的数据.
        response.sendRedirect(request.getContextPath()+"/findAll");
    }
}

UserDao.java

public class UserDao {
    // 根据id , 删除用户信息.
    public void deleById(String id) {
        // 创建QueryRunner对象.
        QueryRunner qr = new QueryRunner(DataSourceUtil.getDataSource());
        // 创建sql语句.
        String sql = "delete from user where id=? ";
        // 执行sql
        try {
            qr.update(sql,id);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
  }

list.jsp

点击删除之后 , 弹出确认框 !

<td>
   <a href="javascript:;" onclick="userDel(${user.id})">删除</a>
</td>

<script type="text/javascript">
        // 当删除按钮被点击时,
        function userDel(userid) {
            // 弹出一个确认框 ,
            if (confirm("你确定要删除吗?")){
                // 跳转到删除的servlet链接.
                location.href = "${pageContext.request.contextPath}/delete?id="+userid;
            }
        }
</script>

注: 查询所有的用户信息和具体实现 , 可参考: https://blog.csdn.net/qq_42986107/article/details/83117451