从零开始——电子商务平台02

一、整体示意图

二、分析

　　1）添加管理员/修改管理员信息

　　　　1、addUser.jsp　　

　　　　　　[通过action跳转到adminServlet中。]

　　　　　　[当Id值存在时，为修改；当Id值不存在时，为注册]

<form role="form" class="form-horizontal"
        action="${pageContext.request.contextPath}/admin/adminServlet?method=addUser&updateId=${updateBean.id }"
        method="post" id="checkForm">
<!--     *********************************************** -->
<!--     *******************updateBean****************** -->
<!--     *******************当修改时，用的****************** -->
<!--     *********************************************** -->
        <div class="form-group"> 
            <label class="col-md-3 control-label" for="username">用户名</label> 
            <div class="col-md-9">
                <input class ="form-control" name="username" type="text" id="username"
                    placeholder="Username" value="${updateBean.username }" />
            </div>
        </div>
        <div class="form-group"> 
            <label class ="col-md-3 control-label"for="inputPassword">密码</label> 
            <div class="col-md-9">
                <input type ="password"name="password" class="form-control"
                id="inputPassword" placeholder="Password"
                value="${updateBean.password }">
            </div>
        </div>
        <div class="form-group"> 
            <label class ="col-md-3 control-label"for="password2">确认密码</label> 
            <div class="col-md-9">
                <input type ="password"name="password2" class="form-control"
                id="password2" placeholder="conformPassword">
            </div>
        </div>
        <div class="form-group"></div>
        <div class="form-group"> 
        <div class ="col-md-offset-3col-md-9">
        <button type ="submit" class="btn btn-primary btn-block">
        提交
        </button>
        </div>
        </div>
        
        <c:if test="${param.status.equals('1')}">
            <div class ="alert alert-danger"role="alert">添加成功</div>
        </c:if> 
        
        <c:if test="${param.status.equals('2')}">
            <div class ="alert alert-danger"role="alert">该用户已存在</div>
        </c:if> 
        
        <c:if test="${param.status.equals('3')}">
            <div class ="alert alert-danger"role="alert">成功</div>
        </c:if>
        
    </form>

　　　　2、adminServlet.java

//添加用户/修改用户信息
    private void addUser(HttpServletRequest req, HttpServletResponse resp) throws ServletException,IOException 
    {
        // TODO Auto-generated method stub
        req.setCharacterEncoding("utf-8");
        
        //************************update**********************
        String updateId = req.getParameter("updateId");
        //****************************************************
        
        AdminDao adminDao = new AdminDao();
        String username =req.getParameter("username");
        String password =req.getParameter("password");
        AdminBean adminBean = new AdminBean();
        
        adminBean.setUsername(username);
        String salt=StringUtil.getRandomString(10);
        //设置盐值
        String md5Pwd= MD5.GetMD5Code(MD5.GetMD5Code(password)+salt);
        //将加密的密码和盐值再加密设为数据库中的密码
        adminBean.setSalt(salt);
        adminBean.setPassword(md5Pwd);
        SimpleDateFormat createDate1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        adminBean.setCreateDate(createDate1.format(new Date()));
        
        //************************传过来的id值 （updateId）为空时，为添加用户，不为空修改**********************
        if(!updateId.equals(""))
        {
            //不为空——修改
            int id = StringUtil.StringToInt(updateId);
            adminBean.setId(id);
            boolean flag = true;
            if(!(username.equals(adminDao.getById(id).getUsername())))
            {
                //用户名与库里的不相等时，flag为true
                flag=adminDao.checkReg(username);
            }
            if(flag)
            {
                adminDao.update(adminBean);
                resp.sendRedirect("adminServlet?method=list&status=2");
                //修改
            }
            else
            {
                resp.sendRedirect("addUser.jsp?status=2");
                //用户已存在
            }
        }
        else
        {
            //为空——注册
            boolean flag = adminDao.checkReg(username);
            if(flag)
            {
                //注册成功，写入数据库
                adminDao.save(adminBean);
                resp.sendRedirect("addUser.jsp?status=1");
            }
            else
            {
                //失败，跳回
                resp.sendRedirect("addUser.jsp?status=2");
            }
        }
    }

　　2）查看管理员信息（修改、删除、分页）

　　　　2.1 修改、删除

　　　　　　1.listUsers.jsp

　　　　　　　　[修改-->adminServlet 中toUpdate方法]

　　　　　　　　[删除-->adminServlet 中delete方法]

<table class ="table table-striped">
            <tr>
                <td>id</td>
                <td>username</td>
                <td>password</td>
                <td>salt</td>
                <td align ="center" colspan="2">操作</td>
            </tr>
    <!-- forEach遍历出adminBeans --> 
        <c:forEach items="${adminBeans}" var="item" varStatus="status">
            <tr>
                <td>${item.id}</td>
                <td><a>${item.username}</a></td>
                <td>${item.password}</td>
                <td>${item.salt}</td>
                <td><a href="${pageContext.request.contextPath}/admin/adminServlet?method=toUpdate&id=${item.id}">修改</a></td>
                <td><a href="${pageContext.request.contextPath}/admin/adminServlet?method=delete&id=${item.id}">删除</a></td>
            </tr>
        </c:forEach>
        
        </table>

　　　　　　2.adminServlet.java

　　　　　　　　[修改-->adminServlet 中toUpdate方法]　　　

private void toUpdate(HttpServletRequest req, HttpServletResponse resp) throws ServletException,IOException {
        // TODO Auto-generated method stub
        req.setCharacterEncoding("utf-8");
        int id=StringUtil.StringToInt(req.getParameter("id"));

        if(id>1)
        {
            AdminDao adminDao = new AdminDao();
            AdminBean adminBean=adminDao.getById(id);
            req.setAttribute(Constants.SESSION_UPDATE_BEAN, adminBean);
            req.getRequestDispatcher("addUser.jsp").forward(req, resp);
        }
        else if(id==1)
        {
            resp.sendRedirect(req.getContextPath()+"/admin/adminServlet?method=list&status=1");
        }
        else
        {
            resp.sendRedirect(req.getContextPath()+"/admin/adminServlet?method=list&status=2");
        }
    }

　　　　　　[删除-->adminServlet 中delete方法]【无提示！！！】

private void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException,IOException {
        // TODO Auto-generated method stub
        req.setCharacterEncoding("utf-8");
        int id=StringUtil.StringToInt(req.getParameter("id"));
        if(id>1)
        {
            AdminDao adminDao = new AdminDao();
            adminDao.delete(id);
            resp.sendRedirect(req.getContextPath()+"/admin/adminServlet?method=list&status=3");
        }
        else if(id==1)
        {
            resp.sendRedirect(req.getContextPath()+"/admin/adminServlet?method=list&status=1");
        }
        else
        {
            resp.sendRedirect(req.getContextPath()+"/admin/adminServlet?method=list&status=2");
        }
    }

 　　2.2 分页

　　　　1.listUsers.jsp

　　　　　[pagingBean 相关量的集合 set get部分]

　　　　<div>
            <util:page pagingBean ="${pagingBean}"/>
        </div>

　　　　2.adminServlet.java

　　　　　　[list-->adminServlet]

　　　　　　[其中设置了pagingBean中的当前页显示的条数 （在Constants中有设置）]

//查看/列举管理员
    private void listUsers(HttpServletRequest req, HttpServletResponse resp) throws ServletException,IOException {
        // TODO Auto-generated method stub
        req.setCharacterEncoding("utf-8");
        String status=req.getParameter("status");
        AdminDao adminDao = new AdminDao();
        int currentPage=StringUtil.StringToInt(req.getParameter("currentPage"));
        int countSize = adminDao.getCount();
        PagingBean pagingBean =new PagingBean(currentPage,countSize,Constants.PAGE_SIZE_1);
        List<AdminBean> adminBeans = adminDao.getListByPage(currentPage * Constants.PAGE_SIZE_1,Constants.PAGE_SIZE_1);
        pagingBean.setPrefixUrl(req.getContextPath()+"/admin/adminServlet?method=list");
        pagingBean.setAnd(true);
        req.setAttribute(Constants.SESSION_ADMIN_BEANS, adminBeans);
        req.setAttribute("pagingBean", pagingBean);
        if(status!=null)
        {
            req.getRequestDispatcher("listUsers.jsp?status="+status).forward(req, resp);
        }
        else
        {
            req.getRequestDispatcher("listUsers.jsp").forward(req, resp);
        }
    }

　　　　3.PageTag.java

　　　　[分页函数的具体实现]

public void doTag() throws JspException, IOException {
        // TODO Auto-generated method stub
        //super.doTag();
        StringBuffer sb =new StringBuffer();
        if(pagingBean!=null)
        {
            sb.append("<nav><ul class='pagination'>");
            if(pagingBean.getCurrentPage()<=0)
            {
                sb.append("<li class='disabled'><a>首页</a></li>");
                sb.append("<li class='disabled'><a href='#'>上一页</a></li>");
            }
            else
            {
                sb.append("<li><a href='").append(pagingBean.getPrefixUrl()).append("'aria-label='Previous'><span aria-hidden='true'>首页</span></a></li>");
                sb.append("<li><a href='").append(pagingBean.getPrefixUrl()).append(pagingBean.isAnd()?"&":"?").append("currentPage=").append(pagingBean.getCurrentPage()-1).append("'>上一页</a></li>");
            }
            
            if(pagingBean.getCurrentPage()>=(pagingBean.getPageCount()-1))
            {
                sb.append("<li class='disabled'><a>下一页</a></li>");
                sb.append("<li class='disabled'><a>尾页</a></li>");
            }
            else
            {
                sb.append("<li><a href='").append(pagingBean.getPrefixUrl()).append(pagingBean.isAnd()?"&":"?").append("currentPage=").append(pagingBean.getCurrentPage()+1).append("'>下一页</a></li>");
                sb.append("<li><a href='").append(pagingBean.getPrefixUrl()).append(pagingBean.isAnd()?"&":"?").append("currentPage=").append(pagingBean.getPageCount()-1).append("'aria-label='Previous'><span aria-hidden='true'>尾页</span></a></li>");
            }
            sb.append("<li><a href='#'>");
            sb.append("<span>");
            sb.append(pagingBean.getCurrentPage()+1);
            sb.append("/");
            sb.append(pagingBean.getPageCount());
            sb.append("</span>");
            sb.append("</a>");
            sb.append("</li>");
            sb.append("</ul></nav>");
        }
        getJspContext().getOut().write(sb.toString());
    }

三、分享

 　　链接：http://pan.baidu.com/s/1gfbzodX 密码：qitj