自定义分页标签
2007-11-30 12:26
288 查看
下面分别是二个javabean作为标签和数据间的转换.
package com.lanzhengwu.web.util;
public class Pager...{
private long totalRows = 0; // 记录总数:需传参数
private int totalPages = 0; // 总页数
private int pageSize =UIConstants.PAGE_SIZE; // 每页显示数据条数，默认为10条记录
private int currentPage = 1; // 当前页数
private boolean hasPrevious = false; // 是否有上一页
private boolean hasNext = false; // 是否有下一页
public Pager() ...{
}
public Pager(long totalRows,int pagesize) ...{
this.totalRows = totalRows;
long temp=totalRows % pagesize == 0 ? totalRows / pagesize
: totalRows / pagesize + 1;
totalPages=Integer.parseInt(temp+"");
refresh(); // 刷新当前页面信息
}
public void setCurrentPage(int currentPage) ...{
this.currentPage = currentPage;
refresh();
}
public void setPageSize(int pageSize) ...{
this.pageSize = pageSize;
refresh();
}
public void setTotalPages(int totalPages) ...{
this.totalPages = totalPages;
refresh();
}
public void setTotalRows(long totalRows) ...{
this.totalRows = totalRows;
refresh();
}
// 跳到第一页
public void first() ...{
currentPage = 1;
this.setHasPrevious(false);
refresh();
}
// 取得上一页（重新设定当前页面即可）
public void previous() ...{
refresh();
}
// 取得下一页
public void next() ...{
refresh();
}
// 跳到最后一页
public void last() ...{
currentPage = totalPages;
this.setHasNext(false);
refresh();
}
public boolean isHasNext() ...{
return hasNext;
}
/** *//**
* @param hasNext The hasNext to set.
*/
public void setHasNext(boolean hasNext) ...{
this.hasNext = hasNext;
}
public boolean isHasPrevious() ...{
return hasPrevious;
}
/** *//**
* @param hasPrevious The hasPrevious to set.
*/
public void setHasPrevious(boolean hasPrevious) ...{
this.hasPrevious = hasPrevious;
}
// 刷新当前页面信息
public void refresh() ...{
if (totalPages <= 1) ...{
hasPrevious = false;
hasNext = false;
} else if (currentPage <= 1) ...{
hasPrevious = false;
hasNext = true;
} else if (currentPage >= totalPages) ...{
hasPrevious = true;
hasNext = false;
} else ...{
hasPrevious = true;
hasNext = true;
}
}
public int getCurrentPage() ...{
return currentPage;
}
public int getPageSize() ...{
return pageSize;
}
public int getTotalPages() ...{
return totalPages;
}
public long getTotalRows() ...{
return totalRows;
}
}
package com.lanzhengwu.web.util;
import javax.servlet.http.*;
public class PagerHelp ...{
public static Pager getPager(HttpServletRequest request,long totalRows,int pagesize)...{
Pager pager=new Pager(totalRows, pagesize);
String currentPage=request.getParameter("pageno");//这里还是接收的页面传过来的Page值
if(currentPage==null || currentPage=="")currentPage="1";
pager.setCurrentPage(Integer.parseInt(currentPage));
pager.setPageSize(pagesize);
String method=request.getParameter("method1");
if("first".equals(method))...{
pager.first();
}else if("previous".equals(method))...{
pager.previous();
}else if("next".equals(method))...{
pager.next();
}else if("last".equals(method))...{
pager.last();
}else...{
pager.refresh();//无论如何一定要刷新一下页面信息,否则在页面中得不到totalpage
}
return pager;
}
}
标签类:
package com.lanzhengwu.web.util;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class PageTag extends TagSupport...{
/** *//**
*
*/
private static final long serialVersionUID = 865166066848853713L;
private long totalRows=0;//总记录数
private int pagesize=UIConstants.PAGE_SIZE;//这不是必须的参数，默认为:UIConstants.PAGE_SIZE
private String forward="";//转向页面:需传参数
private Map<String,Object> paras=null;//页面的参数及值（因为用多个值的话要用MAP来装）
private String para="";//页面的参数（单个时）
private String value="";//参数的值
private String act="";//选择分页模式
private String isHasPara="no";//是否有多个参数，默认为没有
public int doStartTag()...{
JspWriter out=pageContext.getOut();
if("yes".equalsIgnoreCase(getIsHasPara()))...{//多参模式
this.setForward(forward, paras);
}else...{//单参模式
this.setForward1(forward, para, value);
}
HttpServletRequest request=(HttpServletRequest) pageContext.getRequest();
Pager pager=com.cn001cp.web.util.PagerHelp.getPager(request, totalRows,pagesize);
int npage=pager.getCurrentPage();//当前页码
int totalpage=pager.getTotalPages();//当前总页数
try ...{
if(totalpage>1)...{
out.println("<center>");
if(pager.isHasPrevious() && !pager.isHasNext())...{
out.println("<a href='"+forward+"pageno=1&method1=first'>首页</a>");
out.println("<a href='"+forward+"pageno="+(npage-1)+"&method1=previous'>上一页</a>");
out.println("<a href='"+forward+"pageno="+(npage+1)+"&method1=next' disabled=false onclick="return dislink()">下一页</a>");
out.println("<a href='"+forward+"pageno="+totalpage+"&method1=last' disabled=false onclick="return dislink()">尾页</a>");
}else if(pager.isHasNext() && !pager.isHasPrevious())...{
out.println("<a href='"+forward+"pageno=1&method1=first' disabled=false onclick="return dislink()">首页</a>");
out.println("<a href='"+forward+"pageno="+(npage-1)+"&method1=previous' disabled=false onclick="return dislink()">上一页</a>");
out.println("<a href='"+forward+"pageno="+(npage+1)+"&method1=next'>下一页</a>");
out.println("<a href='"+forward+"pageno="+totalpage+"&method1=last'>尾页</a>");
}else if(pager.isHasNext() && pager.isHasPrevious()) ...{
out.println("<a href='"+forward+"pageno=1&method1=first'>首页</a>");
out.println("<a href='"+forward+"pageno="+(npage-1)+"&method1=previous'>上一页</a>");
out.println("<a href='"+forward+"pageno="+(npage+1)+"&method1=next'>下一页</a>");
out.println("<a href='"+forward+"pageno="+totalpage+"&method1=last'>尾页</a>");
}
out.println("<script>function change1(page){");
out.println("window.location='"+forward+"pageno='+page.value");
out.println("}");
out.println("function dislink(){");
out.println("return false;");
out.println("}</script>");
out.println("<select name="select1" onchange="change1(this)">");
for(int i=0;i<totalpage;i++)...{
if(npage!=i+1)...{//不显示当前页数字
out.print("<option value="+(i+1)+">"+(i+1)+"</option>");
}
}
out.println("</select>");
out.println(""+npage+"/"+totalpage+"");
out.println("共"+totalRows+"条记录");
out.println("</center>");
}
} catch (IOException e) ...{
// TODO 自动生成 catch 块
e.printStackTrace();
}
return TagSupport.SKIP_BODY;
}
public void setForward(String forward,Map<String,Object> paras) ...{//设置url(为多参模式时)
this.paras=paras;
Set<Map.Entry<String, Object>> set = paras.entrySet();
if(forward.indexOf("?")==-1)...{//不存在问号
forward=forward+"?pagesize="+getPagesize()+"&";
if(!paras.isEmpty())...{
for(Map.Entry<String,Object> hash :set)...{
forward+=hash.getKey()+"="+hash.getValue()+"&";
}
}
}else...{
forward=forward+"&pagesize="+getPagesize()+"&";
if(!paras.isEmpty())...{
for(Map.Entry<String,Object> hash :set)...{
forward+=hash.getKey()+"="+hash.getValue()+"&";
}
}
}
this.forward = forward;
}
public void setForward1(String forward,String para,String value)...{//设置url(为单参模式时)
if(forward.indexOf("?")==-1)...{//不存在问号
forward=forward+"?pagesize="+getPagesize()+"&";
if(para!="" && value!="")...{
forward+=para+"="+value+"&";
}
}else...{
forward=forward+"&pagesize="+getPagesize()+"&";
if(para!="" && value!="")...{
forward+=para+"="+value+"&";
}
}
public int getPagesize() ...{
return pagesize;
}
public void setPagesize(int pagesize) ...{
this.pagesize = pagesize;
}
public void setTotalRows(long totalRows) ...{
this.totalRows = totalRows;
}
public void setForward(String forward) ...{
this.forward = forward;
}
public String getAct() ...{
return act;
}
public String getForward() ...{
return forward;
}
public long getTotalRows() ...{
return totalRows;
}
public String getIsHasPara() ...{
return isHasPara;
}
public void setIsHasPara(String isHasPara) ...{
this.isHasPara = isHasPara;
}
public String getPara() ...{
return para;
}
public void setPara(String para) ...{
this.para = para;
}
public Map<String, Object> getParas() ...{
return paras;
}
public void setParas(Map<String, Object> paras) ...{
this.paras = paras;
}
public String getValue() ...{
return value;
}
public void setValue(String value) ...{
this.value = value;
}
public void setAct(String act) ...{
this.act = act;
}
}
this.forward=forward;
}
.tld文档标签部分:
<tag>
<name>showpage</name><!-- 显示分页 -->
<tag-class>com.cn001cp.web.util.PageTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>totalRows</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>forward</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pagesize</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>paras</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>act</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>para</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>value</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>isHasPara</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
package com.lanzhengwu.web.util;
public class Pager...{
private long totalRows = 0; // 记录总数:需传参数
private int totalPages = 0; // 总页数
private int pageSize =UIConstants.PAGE_SIZE; // 每页显示数据条数，默认为10条记录
private int currentPage = 1; // 当前页数
private boolean hasPrevious = false; // 是否有上一页
private boolean hasNext = false; // 是否有下一页
public Pager() ...{
}
public Pager(long totalRows,int pagesize) ...{
this.totalRows = totalRows;
long temp=totalRows % pagesize == 0 ? totalRows / pagesize
: totalRows / pagesize + 1;
totalPages=Integer.parseInt(temp+"");
refresh(); // 刷新当前页面信息
}
public void setCurrentPage(int currentPage) ...{
this.currentPage = currentPage;
refresh();
}
public void setPageSize(int pageSize) ...{
this.pageSize = pageSize;
refresh();
}
public void setTotalPages(int totalPages) ...{
this.totalPages = totalPages;
refresh();
}
public void setTotalRows(long totalRows) ...{
this.totalRows = totalRows;
refresh();
}
// 跳到第一页
public void first() ...{
currentPage = 1;
this.setHasPrevious(false);
refresh();
}
// 取得上一页（重新设定当前页面即可）
public void previous() ...{
refresh();
}
// 取得下一页
public void next() ...{
refresh();
}
// 跳到最后一页
public void last() ...{
currentPage = totalPages;
this.setHasNext(false);
refresh();
}
public boolean isHasNext() ...{
return hasNext;
}
/** *//**
* @param hasNext The hasNext to set.
*/
public void setHasNext(boolean hasNext) ...{
this.hasNext = hasNext;
}
public boolean isHasPrevious() ...{
return hasPrevious;
}
/** *//**
* @param hasPrevious The hasPrevious to set.
*/
public void setHasPrevious(boolean hasPrevious) ...{
this.hasPrevious = hasPrevious;
}
// 刷新当前页面信息
public void refresh() ...{
if (totalPages <= 1) ...{
hasPrevious = false;
hasNext = false;
} else if (currentPage <= 1) ...{
hasPrevious = false;
hasNext = true;
} else if (currentPage >= totalPages) ...{
hasPrevious = true;
hasNext = false;
} else ...{
hasPrevious = true;
hasNext = true;
}
}
public int getCurrentPage() ...{
return currentPage;
}
public int getPageSize() ...{
return pageSize;
}
public int getTotalPages() ...{
return totalPages;
}
public long getTotalRows() ...{
return totalRows;
}
}
package com.lanzhengwu.web.util;
import javax.servlet.http.*;
public class PagerHelp ...{
public static Pager getPager(HttpServletRequest request,long totalRows,int pagesize)...{
Pager pager=new Pager(totalRows, pagesize);
String currentPage=request.getParameter("pageno");//这里还是接收的页面传过来的Page值
if(currentPage==null || currentPage=="")currentPage="1";
pager.setCurrentPage(Integer.parseInt(currentPage));
pager.setPageSize(pagesize);
String method=request.getParameter("method1");
if("first".equals(method))...{
pager.first();
}else if("previous".equals(method))...{
pager.previous();
}else if("next".equals(method))...{
pager.next();
}else if("last".equals(method))...{
pager.last();
}else...{
pager.refresh();//无论如何一定要刷新一下页面信息,否则在页面中得不到totalpage
}
return pager;
}
}
标签类:
package com.lanzhengwu.web.util;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class PageTag extends TagSupport...{
/** *//**
*
*/
private static final long serialVersionUID = 865166066848853713L;
private long totalRows=0;//总记录数
private int pagesize=UIConstants.PAGE_SIZE;//这不是必须的参数，默认为:UIConstants.PAGE_SIZE
private String forward="";//转向页面:需传参数
private Map<String,Object> paras=null;//页面的参数及值（因为用多个值的话要用MAP来装）
private String para="";//页面的参数（单个时）
private String value="";//参数的值
private String act="";//选择分页模式
private String isHasPara="no";//是否有多个参数，默认为没有
public int doStartTag()...{
JspWriter out=pageContext.getOut();
if("yes".equalsIgnoreCase(getIsHasPara()))...{//多参模式
this.setForward(forward, paras);
}else...{//单参模式
this.setForward1(forward, para, value);
}
HttpServletRequest request=(HttpServletRequest) pageContext.getRequest();
Pager pager=com.cn001cp.web.util.PagerHelp.getPager(request, totalRows,pagesize);
int npage=pager.getCurrentPage();//当前页码
int totalpage=pager.getTotalPages();//当前总页数
try ...{
if(totalpage>1)...{
out.println("<center>");
if(pager.isHasPrevious() && !pager.isHasNext())...{
out.println("<a href='"+forward+"pageno=1&method1=first'>首页</a>");
out.println("<a href='"+forward+"pageno="+(npage-1)+"&method1=previous'>上一页</a>");
out.println("<a href='"+forward+"pageno="+(npage+1)+"&method1=next' disabled=false onclick="return dislink()">下一页</a>");
out.println("<a href='"+forward+"pageno="+totalpage+"&method1=last' disabled=false onclick="return dislink()">尾页</a>");
}else if(pager.isHasNext() && !pager.isHasPrevious())...{
out.println("<a href='"+forward+"pageno=1&method1=first' disabled=false onclick="return dislink()">首页</a>");
out.println("<a href='"+forward+"pageno="+(npage-1)+"&method1=previous' disabled=false onclick="return dislink()">上一页</a>");
out.println("<a href='"+forward+"pageno="+(npage+1)+"&method1=next'>下一页</a>");
out.println("<a href='"+forward+"pageno="+totalpage+"&method1=last'>尾页</a>");
}else if(pager.isHasNext() && pager.isHasPrevious()) ...{
out.println("<a href='"+forward+"pageno=1&method1=first'>首页</a>");
out.println("<a href='"+forward+"pageno="+(npage-1)+"&method1=previous'>上一页</a>");
out.println("<a href='"+forward+"pageno="+(npage+1)+"&method1=next'>下一页</a>");
out.println("<a href='"+forward+"pageno="+totalpage+"&method1=last'>尾页</a>");
}
out.println("<script>function change1(page){");
out.println("window.location='"+forward+"pageno='+page.value");
out.println("}");
out.println("function dislink(){");
out.println("return false;");
out.println("}</script>");
out.println("<select name="select1" onchange="change1(this)">");
for(int i=0;i<totalpage;i++)...{
if(npage!=i+1)...{//不显示当前页数字
out.print("<option value="+(i+1)+">"+(i+1)+"</option>");
}
}
out.println("</select>");
out.println(""+npage+"/"+totalpage+"");
out.println("共"+totalRows+"条记录");
out.println("</center>");
}
} catch (IOException e) ...{
// TODO 自动生成 catch 块
e.printStackTrace();
}
return TagSupport.SKIP_BODY;
}
public void setForward(String forward,Map<String,Object> paras) ...{//设置url(为多参模式时)
this.paras=paras;
Set<Map.Entry<String, Object>> set = paras.entrySet();
if(forward.indexOf("?")==-1)...{//不存在问号
forward=forward+"?pagesize="+getPagesize()+"&";
if(!paras.isEmpty())...{
for(Map.Entry<String,Object> hash :set)...{
forward+=hash.getKey()+"="+hash.getValue()+"&";
}
}
}else...{
forward=forward+"&pagesize="+getPagesize()+"&";
if(!paras.isEmpty())...{
for(Map.Entry<String,Object> hash :set)...{
forward+=hash.getKey()+"="+hash.getValue()+"&";
}
}
}
this.forward = forward;
}
public void setForward1(String forward,String para,String value)...{//设置url(为单参模式时)
if(forward.indexOf("?")==-1)...{//不存在问号
forward=forward+"?pagesize="+getPagesize()+"&";
if(para!="" && value!="")...{
forward+=para+"="+value+"&";
}
}else...{
forward=forward+"&pagesize="+getPagesize()+"&";
if(para!="" && value!="")...{
forward+=para+"="+value+"&";
}
}
public int getPagesize() ...{
return pagesize;
}
public void setPagesize(int pagesize) ...{
this.pagesize = pagesize;
}
public void setTotalRows(long totalRows) ...{
this.totalRows = totalRows;
}
public void setForward(String forward) ...{
this.forward = forward;
}
public String getAct() ...{
return act;
}
public String getForward() ...{
return forward;
}
public long getTotalRows() ...{
return totalRows;
}
public String getIsHasPara() ...{
return isHasPara;
}
public void setIsHasPara(String isHasPara) ...{
this.isHasPara = isHasPara;
}
public String getPara() ...{
return para;
}
public void setPara(String para) ...{
this.para = para;
}
public Map<String, Object> getParas() ...{
return paras;
}
public void setParas(Map<String, Object> paras) ...{
this.paras = paras;
}
public String getValue() ...{
return value;
}
public void setValue(String value) ...{
this.value = value;
}
public void setAct(String act) ...{
this.act = act;
}
}
this.forward=forward;
}
.tld文档标签部分:
<tag>
<name>showpage</name><!-- 显示分页 -->
<tag-class>com.cn001cp.web.util.PageTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>totalRows</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>forward</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pagesize</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>paras</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>act</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>para</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>value</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>isHasPara</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
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