SSH-Projektkundenliste und BaseDao-Kapselungsbeispiel

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1if(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";
    }

    @Overridepublic 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;
    @Overridepublic 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="${pageContext.request.contextPath }/css/Style.css?1.1.11" type=text/css rel=stylesheet><LINK href="${pageContext.request.contextPath }/css/Manage.css?1.1.11" type=text/cssrel=stylesheet><script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.4.4.min.js?1.1.11"></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=${pageContext.request.contextPath }/images/new_022.jpg><IMGsrc="${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=0width="100%" align=center border=0><Tbody><TR><TD height=25><FORM id="pageForm" name="customerForm"action="${pageContext.request.contextPath }/CustomerAction_list"method=post><!-- 隐藏域.当前页码 --><input type="hidden" name="currentPage" id="currentPageInput" value="<s:property value="#pageBean.currentPage" />" /><!-- 隐藏域.每页显示条数 --><input type="hidden" name="pageSize" id="pageSizeInput"       value="<s:property value="#pageBean.pageSize" />" /><TABLE cellSpacing=0 cellPadding=2 border=0><Tbody><TR><TD>客户名称：</TD><TD><INPUT class=textbox id=sChannel2style="WIDTH: 80px" maxLength=50 name="cust_name" value="${param.cust_name}"></TD><TD><INPUT class=button id=sButton2 type=submitvalue=" 筛选 " name=sButton2></TD></TR></Tbody></TABLE></FORM></TD></TR><TR><TD><TABLE id=gridstyle="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><TRstyle="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>  <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($(&#39;#pageSizeSelect option&#39;).filter(&#39;:selected&#39;).val()) --%> <select name="pageSize" onchange="changePageSize($(&#39;#pageSizeSelect option:selected&#39;).val())" id="pageSizeSelect" ><option value="3" <s:property value="#pageBean.pageSize==3?&#39;selected&#39;:&#39;&#39;" /> >3</option><option value="5" <s:property value="#pageBean.pageSize==5?&#39;selected&#39;:&#39;&#39;" /> >5</option></select>条
                                                [<A href="javaScript:void(0)" onclick="changePage(<s:property value=&#39;#pageBean.currentPage-1&#39; />)" >前一页</A>]<B><s:property value="#pageBean.currentPage" /></B>[<A href="javaScript:void(0)" onclick="changePage(<s:property value=&#39;#pageBean.currentPage+1&#39; />)"  >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($(&#39;#page&#39;).val())"/></DIV></SPAN></TD></TR></Tbody></TABLE></TD><TD width=15 background="${pageContext.request.contextPath }/images/new_023.jpg"><IMGsrc="${pageContext.request.contextPath }/images/new_023.jpg" border=0></TD></TR></Tbody></TABLE><TABLE cellSpacing=0 cellPadding=0 width="98%" border=0><Tbody><TR><TD width=15><IMG src="${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];
    }

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

    @Overridepublic void delete(T t) {
        
        getHibernateTemplate().delete(t);
        
    }

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

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

    @Overridepublic T getById(Serializable id) {        
        
        return (T) getHibernateTemplate().get(clazz, id);
    }

    @Overridepublic 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;
        }
        
    }

    @Overridepublic 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 {
    
}

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