JAVAEE——SSH项目实战02：客户列表和BaseDao封装

作者： kent鹏

转载请注明出处： http://www.cnblogs.com/xieyupeng/p/7129152.html

该项目在SSH三大框架整合基础上进行开发：http://www.cnblogs.com/xieyupeng/p/7108141.html

一、客户列表

　　1.分析

　　2.书写步骤

　　（1）封装PageBean

public class PageBean {
    //当前页数
    private Integer currentPage;
    //总记录数
    private Integer totalCount;
    //每页显示条数
    private Integer pageSize;
    //总页数
    private Integer totalPage;
    //分页列表数据
    private List    list;
    public PageBean(Integer currentPage, Integer totalCount, Integer pageSize) {
        this.totalCount = totalCount;

        this.pageSize =  pageSize;

        this.currentPage = currentPage;

        if(this.currentPage == null){
            //如页面没有指定显示那一页.显示第一页.
            this.currentPage = 1;
        }

        if(this.pageSize == null){
            //如果每页显示条数没有指定,默认每页显示3条
            this.pageSize = 3;
        }

        //计算总页数
        this.totalPage = (this.totalCount+this.pageSize-1)/this.pageSize;

        //判断当前页数是否超出范围
        //不能小于1
        if(this.currentPage < 1){
            this.currentPage = 1;
        }
        //不能大于总页数
        if(this.currentPage > this.totalPage){
            this.currentPage = this.totalPage;
        }

    }
    //计算起始索引
    public int getStart(){
        return (this.currentPage-1)*this.pageSize;
    }

    public Integer getCurrentPage() {
        return currentPage;
    }
    public void setCurrentPage(Integer currentPage) {
        this.currentPage = currentPage;
    }
    public Integer getTotalCount() {
        return totalCount;
    }
    public void setTotalCount(Integer totalCount) {
        this.totalCount = totalCount;
    }
    public Integer getPageSize() {
        return pageSize;
    }
    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }
    public Integer getTotalPage() {
        return totalPage;
    }
    public void setTotalPage(Integer totalPage) {
        this.totalPage = totalPage;
    }
    public List getList() {
        return list;
    }
    public void setList(List list) {
        this.list = list;
    }

}

　　（2）书写Action

public class CustomerAction extends ActionSupport implements ModelDriven<Customer> {
    private Customer customer = new Customer();

    private CustomerService cs;

    private Integer currentPage;
    private Integer pageSize;
    public String list() throws Exception {
        //封装离线查询对象
        DetachedCriteria dc = DetachedCriteria.forClass(Customer.class);
        //判断并封装参数
        if(StringUtils.isNotBlank(customer.getCust_name())){
            dc.add(Restrictions.like("cust_name", "%"+customer.getCust_name()+"%"));
        }

        //1 调用Service查询分页数据(PageBean)
        PageBean pb = cs.getPageBean(dc,currentPage,pageSize);
        //2 将PageBean放入request域,转发到列表页面显示
        ActionContext.getContext().put("pageBean", pb);
        return "list";
    }

    @Override
    public Customer getModel() {
        return customer;
    }

    public void setCs(CustomerService cs) {
        this.cs = cs;
    }

    public Integer getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(Integer currentPage) {
        this.currentPage = currentPage;
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

}

　　（3）书写Service

public class CustomerServiceImpl implements CustomerService {
    private CustomerDao cd;
    @Override
    public PageBean getPageBean(DetachedCriteria dc, Integer currentPage, Integer pageSize) {
        //1 调用Dao查询总记录数
        Integer totalCount = cd.getTotalCount(dc);
        //2 创建PageBean对象
        PageBean pb = new PageBean(currentPage, totalCount, pageSize);
        //3 调用Dao查询分页列表数据

        List<Customer> list = cd.getPageList(dc,pb.getStart(),pb.getPageSize());
        //4 列表数据放入pageBean中.并返回
        pb.setList(list);
        return pb;
    }
    public void setCd(CustomerDao cd) {
        this.cd = cd;
    }

}

　　（4）书写Dao

public class CustomerDaoImpl extends HibernateDaoSupport implements CustomerDao {

    public Integer getTotalCount(DetachedCriteria dc) {
        //设置查询的聚合函数,总记录数
        dc.setProjection(Projections.rowCount());

        List<Long> list = (List<Long>) getHibernateTemplate().findByCriteria(dc);

        //清空之前设置的聚合函数
        dc.setProjection(null);

        if(list!=null && list.size()>0){
            Long count = list.get(0);
            return count.intValue();
        }else{
            return null;
        }
    }

    public List<Customer> getPageList(DetachedCriteria dc, int start, Integer pageSize) {

        return (List<Customer>) getHibernateTemplate().findByCriteria(dc, start, pageSize);

    }

}

　　（5）完成struts以及spring的配置

　　 strus.xml添加代码：

    <action name="CustomerAction_*" class="customerAction" method="{1}" >
         <result name="list"  >/jsp/customer/list.jsp</result>
    </action>

　　 applicationContext.xml添加代码：

    <bean name="customerAction" class="cn.xyp.web.action.CustomerAction" scope="prototype" >
        <property name="cs" ref="customerService" ></property>
    </bean>

    <bean name="customerService" class="cn.xyp.service.impl.CustomerServiceImpl" >
        <property name="cd" ref="customerDao" ></property>
    </bean>

    <bean name="customerDao" class="cn.xyp.dao.impl.CustomerDaoImpl" >
        <!-- 注入sessionFactory -->
        <property name="sessionFactory" ref="sessionFactory" ></property>
    </bean>

　　（6）书写前台list.jsp页面

　　 主要通过表单提交隐藏域的数据、jq和ognl表达式来实现。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib  prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<TITLE>客户列表</TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<LINK href="${pageContext.request.contextPath }/css/Style.css" type=text/css rel=stylesheet>
<LINK href="${pageContext.request.contextPath }/css/Manage.css" type=text/css
    rel=stylesheet>
<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.4.4.min.js"></script>
<SCRIPT language=javascript>
    function changePage(pageNum){
            //1 将页码的值放入对应表单隐藏域中
                $("#currentPageInput").val(pageNum);
            //2 提交表单
                $("#pageForm").submit();
    };

    function changePageSize(pageSize){
            //1 将页码的值放入对应表单隐藏域中
            $("#pageSizeInput").val(pageSize);
        //2 提交表单
            $("#pageForm").submit();
    };
</SCRIPT>

<META content="MSHTML 6.00.2900.3492" name=GENERATOR>
</HEAD>
<BODY>

        <TABLE cellSpacing=0 cellPadding=0 width="98%" border=0>
            <TBODY>
                <TR>
                    <TD width=15><IMG src="${pageContext.request.contextPath }/images/new_019.jpg"
                        border=0></TD>
                    <TD width="100%" background="${pageContext.request.contextPath }/images/new_020.jpg"
                        height=20></TD>
                    <TD width=15><IMG src="${pageContext.request.contextPath }/images/new_021.jpg"
                        border=0></TD>
                </TR>
            </TBODY>
        </TABLE>
        <TABLE cellSpacing=0 cellPadding=0 width="98%" border=0>
            <TBODY>
                <TR>
                    <TD width=15 background=${pageContext.request.contextPath }/images/new_022.jpg><IMG
                        src="${pageContext.request.contextPath }/images/new_022.jpg" border=0></TD>
                    <TD vAlign=top width="100%" bgColor=#ffffff>
                        <TABLE cellSpacing=0 cellPadding=5 width="100%" border=0>
                            <TR>
                                <TD class=manageHead>当前位置：客户管理 &gt; 客户列表</TD>
                            </TR>
                            <TR>
                                <TD height=2></TD>
                            </TR>
                        </TABLE>
                        <TABLE borderColor=#cccccc cellSpacing=0 cellPadding=0
                            width="100%" align=center border=0>
                            <TBODY>
                                <TR>
                                    <TD height=25>
                                    <FORM id="pageForm" name="customerForm"
                                        action="${pageContext.request.contextPath }/CustomerAction_list"
                                        method=post>
                                        <!-- 隐藏域.当前页码 -->
                                        <input type="hidden" name="currentPage" id="currentPageInput" value="<s:property value="#pageBean.currentPage" />" />
                                        <!-- 隐藏域.每页显示条数 -->
                                        <input type="hidden" name="pageSize" id="pageSizeInput"       value="<s:property value="#pageBean.pageSize" />" />
                                        <TABLE cellSpacing=0 cellPadding=2 border=0>
                                            <TBODY>
                                                <TR>
                                                    <TD>客户名称：</TD>
                                                    <TD><INPUT class=textbox id=sChannel2
                                                        style="WIDTH: 80px" maxLength=50 name="cust_name" value="${param.cust_name}"></TD>

                                                    <TD><INPUT class=button id=sButton2 type=submit
                                                        value=" 筛选 " name=sButton2></TD>
                                                </TR>
                                            </TBODY>
                                        </TABLE>
                                    </FORM>
                                    </TD>
                                </TR>

                                <TR>
                                    <TD>
                                        <TABLE id=grid
                                            style="BORDER-TOP-WIDTH: 0px; FONT-WEIGHT: normal; BORDER-LEFT-WIDTH: 0px; BORDER-LEFT-COLOR: #cccccc; BORDER-BOTTOM-WIDTH: 0px; BORDER-BOTTOM-COLOR: #cccccc; WIDTH: 100%; BORDER-TOP-COLOR: #cccccc; FONT-STYLE: normal; BACKGROUND-COLOR: #cccccc; BORDER-RIGHT-WIDTH: 0px; TEXT-DECORATION: none; BORDER-RIGHT-COLOR: #cccccc"
                                            cellSpacing=1 cellPadding=2 rules=all border=0>
                                            <TBODY>
                                                <TR
                                                    style="FONT-WEIGHT: bold; FONT-STYLE: normal; BACKGROUND-COLOR: #eeeeee; TEXT-DECORATION: none">
                                                    <TD>客户名称</TD>
                                                    <TD>客户级别</TD>
                                                    <TD>客户来源</TD>
                                                    <TD>联系人</TD>
                                                    <TD>电话</TD>
                                                    <TD>手机</TD>
                                                    <TD>操作</TD>
                                                </TR>
                                                <s:iterator value="#pageBean.list" var="cust" >
                                                <TR
                                                    style="FONT-WEIGHT: normal; FONT-STYLE: normal; BACKGROUND-COLOR: white; TEXT-DECORATION: none">
                                                    <TD>
                                                        <s:property value="#cust.cust_name" />
                                                    </TD>
                                                    <TD>
                                                    <s:property value="#cust.cust_level" />
                                                    </TD>
                                                    <TD>
                                                    <s:property value="#cust.cust_source" />
                                                    </TD>
                                                    <TD>
                                                    <s:property value="#cust.cust_linkman" />
                                                    </TD>
                                                    <TD>
                                                    <s:property value="#cust.cust_phone" />
                                                    </TD>
                                                    <TD>
                                                    <s:property value="#cust.cust_mobile" />
                                                    </TD>
                                                    <TD>
                                                    <a href="${pageContext.request.contextPath }/customerServlet?method=edit&custId=${customer.cust_id}">修改</a>
                                                    &nbsp;&nbsp;
                                                    <a href="${pageContext.request.contextPath }/customerServlet?method=delete&custId=${customer.cust_id}">删除</a>
                                                    </TD>
                                                </TR>
                                                </s:iterator>

                                            </TBODY>
                                        </TABLE>
                                    </TD>
                                </TR>

                                <TR>
                                    <TD><SPAN id=pagelink>
                                            <DIV
                                                style="LINE-HEIGHT: 20px; HEIGHT: 20px; TEXT-ALIGN: right">
                                                共[<B><s:property value="#pageBean.totalCount" /> </B>]条记录,[<B><s:property value="#pageBean.totalPage" /></B>]页
                                                ,每页显示 <%-- changePageSize($('#pageSizeSelect option').filter(':selected').val()) --%>
                                                <select name="pageSize" onchange="changePageSize($('#pageSizeSelect option:selected').val())" id="pageSizeSelect" >
                                                    <option value="3" <s:property value="#pageBean.pageSize==3?'selected':''" /> >3</option>
                                                    <option value="5" <s:property value="#pageBean.pageSize==5?'selected':''" /> >5</option>
                                                </select>
                                                条
                                                [<A href="javaScript:void(0)" onclick="changePage(<s:property value='#pageBean.currentPage-1' />)" >前一页</A>]
                                                <B><s:property value="#pageBean.currentPage" /></B>
                                                [<A href="javaScript:void(0)" onclick="changePage(<s:property value='#pageBean.currentPage+1' />)"  >后一页</A>]
                                                到
                                                <input type="text" size="3" id="page" name="page" value="<s:property value="#pageBean.currentPage" />"  />
                                                页

                                                <input type="button" value="Go" onclick="changePage($('#page').val())"/>
                                            </DIV>
                                    </SPAN></TD>
                                </TR>
                            </TBODY>
                        </TABLE>
                    </TD>
                    <TD width=15 background="${pageContext.request.contextPath }/images/new_023.jpg"><IMG
                        src="${pageContext.request.contextPath }/images/new_023.jpg" border=0></TD>
                </TR>
            </TBODY>
        </TABLE>
        <TABLE cellSpacing=0 cellPadding=0 width="98%" border=0>
            <TBODY>
                <TR>
                    <TD width=15><IMG src="${pageContext.request.contextPath }/images/new_024.jpg"
                        border=0></TD>
                    <TD align=middle width="100%"
                        background="${pageContext.request.contextPath }/images/new_025.jpg" height=15></TD>
                    <TD width=15><IMG src="${pageContext.request.contextPath }/images/new_026.jpg"
                        border=0></TD>
                </TR>
            </TBODY>
        </TABLE>

</BODY>
</HTML>

二、BaseDao封装

　　1.抽取BaseDao

　　2.BaseDao设计思路

　　3.BaseDao接口书写

public interface BaseDao<T> {
    //增
    void save(T t);
    //删
    void delete(T t);
    //删
    void delete(Serializable id);
    //改
    void update(T t);
    //查 根据id查询
    T    getById(Serializable id);
    //查 符合条件的总记录数
    Integer    getTotalCount(DetachedCriteria dc);
    //查 查询分页列表数据
    List<T> getPageList(DetachedCriteria dc,Integer start,Integer pageSize);

}

　　4.BaseDao的实现类

public class BaseDaoImpl<T> extends HibernateDaoSupport implements BaseDao<T> {

    private Class clazz;//用于接收运行期泛型类型

    public BaseDaoImpl() {
        //获得当前类型的带有泛型类型的父类
        ParameterizedType ptClass = (ParameterizedType) this.getClass().getGenericSuperclass();
        //获得运行期的泛型类型
        clazz = (Class) ptClass.getActualTypeArguments()[0];
    }

    @Override
    public void save(T t) {
        getHibernateTemplate().save(t);
    }

    @Override
    public void delete(T t) {

        getHibernateTemplate().delete(t);

    }

    @Override
    public void delete(Serializable id) {
        T t = this.getById(id);//先取,再删
        getHibernateTemplate().delete(t);
    }

    @Override
    public void update(T t) {
        getHibernateTemplate().update(t);
    }

    @Override
    public T getById(Serializable id) {

        return (T) getHibernateTemplate().get(clazz, id);
    }

    @Override
    public Integer getTotalCount(DetachedCriteria dc) {
        //设置查询的聚合函数,总记录数
        dc.setProjection(Projections.rowCount());

        List<Long> list = (List<Long>) getHibernateTemplate().findByCriteria(dc);

        //清空之前设置的聚合函数
        dc.setProjection(null);

        if(list!=null && list.size()>0){
            Long count = list.get(0);
            return count.intValue();
        }else{
            return null;
        }

    }

    @Override
    public List<T> getPageList(DetachedCriteria dc, Integer start, Integer pageSize) {

        List<T> list = (List<T>) getHibernateTemplate().findByCriteria(dc, start, pageSize);

        return list;
    }
}

　　5.业务Dao中的应用

public class CustomerDaoImpl extends BaseDaoImpl<Customer> implements CustomerDao {

}