剑事 — Wed, 11 May 2005 16:21:00 GMT

native2ascii
用这个命令�{换我觉得不方�?不知别�h如何呵呵

攚w��?859_1�Q�不能是iso-8859-1�Q�可以不用native2ascii转换ApplicationResources.properties
可是没页都要改啊8859_1也很�ȝ��

所以只好找struts本��n来解决了呵呵

*不过�q�个�Ҏ��只适合��应用，不需要多国语�a��?

struts.jar

org.apache.struts.taglib.bean.MessageTag�c?/p>

扑ֈ�doStartTag()�Ҏ��

里面有行ResponseUtils.write(super.pageContext, message);

在这行上面加上一�?如下

        try
        {
            message = new String(message.getBytes("iso-8859-1"), "gb2312");
        }
        catch(Exception exception) { }

        ResponseUtils.write(super.pageContext, message);

�q�样��OK�?/p>

<%@ page contentType="text/html; charset=gb2312" language="java" %>
要用gb2312

剑事 2005-05-12 00:21 发表评论

剑事 — Wed, 11 May 2005 08:58:00 GMT

说是struts分页,实际上这个分��늱�不局限在某个框架下用�?br />
实现�Ҏ��是通过list�?map 来封装数据结果集省了建立formbean和手动对formbean赋值的�ȝ��Q?br />用list�?map 来封装后使用��h��和rs基本上一��P��有些地方比RS方便些�?br />本分��늱�中对查询参数已经作了处理�Q�所以不需要在自己在去拼URL参数了�?br />

sql server分页使用存储�q�程要更高效�?br />下面�q�个存储�q�程是从SQL区找到的

-----------------------------------------------------------------------------------------------------------------------------------
CREATE Proc p_show
@QueryStr varchar(8000), --表名、视囑֐�、查询语�?br />@PageSize int=10,   --每页的大��?行数)
@PageCurrent int=1,   --要显�C�的��?br />@FdShow varchar (8000)='', --要显�C�的字段列表,如果查询�l�果有标识字�D?需要指定此�?且不包含标识字段
@FdOrder nvarchar (3000)='' --排序字段列表
as
declare @FdName nvarchar(550) --表中的主键或表、��时表中的标识列名
,@Id1 varchar(80),@Id2 varchar(80) --开始和�l�束的记录号
,@Obj_ID int    --对象ID
--表中有复合主键的处理
declare @strfd nvarchar(4000) --复合主键列表
,@strjoin varchar(8000) --�q�接字段
,@strwhere nvarchar(4000) --查询条�g

select @Obj_ID=object_id(@QueryStr)
,@FdShow=case isnull(@FdShow,'') when '' then ' *' else ' '+@FdShow end
,@FdOrder=case isnull(@FdOrder,'') when '' then '' else ' order by '+@FdOrder end
,@QueryStr=case when @Obj_ID is not null then ' '+@QueryStr else ' ('+@QueryStr+') a' end

--如果昄��W�一��，可以直接用top来完�?br />if @PageCurrent=1
begin
select @Id1=cast(@PageSize as varchar(50))
exec('select top '+@Id1+@FdShow+' from '+@QueryStr+@FdOrder)
return
end

--如果是表,则检查表中是否有标识更或主键
if @Obj_ID is not null and objectproperty(@Obj_ID,'IsTable')=1
begin
select @Id1=cast(@PageSize as varchar(50))
,@Id2=cast((@PageCurrent-1)*@PageSize as varchar(50))

select @FdName=name from syscolumns where id=@Obj_ID and status=0x80
if @@rowcount=0 --如果表中无标识列,则检查表中是否有主键
begin
if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype='PK')
goto lbusetemp --如果表中无主�?则用临时表处�?/p>

select @FdName=name from syscolumns where id=@Obj_ID and colid in(
   select colid from sysindexkeys where @Obj_ID=id and indid in(
    select indid from sysindexes where @Obj_ID=id and name in(
     select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
   )))
if @@rowcount>1 --��查表中的主键是否为复合主�?br /> begin
   select @strfd='',@strjoin='',@strwhere=''
   select @strfd=@strfd+',['+name+']'
    ,@strjoin=@strjoin+' and a.['+name+']=b.['+name+']'
    ,@strwhere=@strwhere+' and b.['+name+'] is null'
    from syscolumns where id=@Obj_ID and colid in(
    select colid from sysindexkeys where @Obj_ID=id and indid in(
     select indid from sysindexes where @Obj_ID=id and name in(
      select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
    )))
   select @strfd=substring(@strfd,2,2000)
    ,@strjoin=substring(@strjoin,5,4000)
    ,@strwhere=substring(@strwhere,5,4000)
   goto lbusepk
end
end
end
else
goto lbusetemp

/*--使用标识列或主键为单一字段的处理方�?-*/
lbuseidentity:
exec('select top '+@Id1+@FdShow+' from '+@QueryStr
+' where '+@FdName+' not in(select top '
+@Id2+''+@FdName+' from '+@QueryStr+@FdOrder
+')'+@FdOrder
)
return

/*--表中有复合主键的处理�Ҏ��--*/
lbusepk:
exec('select '+@FdShow+' from(select top '+@Id1+' a.* from
(select top 100 percent * from '+@QueryStr+@FdOrder+') a
left join (select top '+@Id2+''+@strfd+'
from '+@QueryStr+@FdOrder+') b on '+@strjoin+'
where '+@strwhere+') a'
)
return

/*--用��时表处理的方�?-*/
lbusetemp:
select @FdName='[ID_'+cast(newid() as varchar(80))+']'
,@Id1=cast(@PageSize*(@PageCurrent-1) as varchar(50))
,@Id2=cast(@PageSize*@PageCurrent-1 as varchar(50))

exec('select '+@FdName+'=identity(int,0,1),'+@FdShow+'
into #tb from'+@QueryStr+@FdOrder+'
select '+@FdShow+' from #tb where '+@FdName+' between '
+@Id1+' and '+@Id2
)
GO
--------------------------------------------------------------------------------------------------------------------------------

�q�里需要徏立一个分��늱�ResultGatherPro.java
相关说明在相应行的后�?br />

--------------------------------------------------------------------------------------------------------------------------------

import conn.DBConnManager;//�q�个是连接池�Q�可以更换其他的�?/p>

import javax.servlet.http.HttpServletRequest;
import java.sql.*;
import java.util.*;

public class ResultGatherPro {
    private String sql;
    private int intPageSize; //每页行数
    private int intRowCount;
    private int intPageCount;
    private int intPage; //��号
    private String Counter;
    DBConnManager conn = null;
    Connection con = null;
    CallableStatement stmt = null;
    ResultSet rs = null;
    Statement st = null;
    ResultSet rsc = null;
    private String defaultname = "default";

public ResultGatherPro() {

}

    public ResultGatherPro(String sqlcom, int rownum, int pagenum, String counter) {
        System.out.println(counter);
        sql = sqlcom;
        intPageSize = rownum;
        intPage = pagenum;
        Counter = counter;
        System.out.println(sqlcom);
    }
    public void setUseDB(String dbname)
    {
        this.defaultname = dbname;
    }
    public List selectRS(String sqlcom, int rownum, int pagenum, String counter) {
        System.out.println(counter);
        this.sql = sqlcom;
        this.intPageSize = rownum;
        this.intPage = pagenum;
        this.Counter = counter;
        System.out.println(sqlcom);
        return selectRS();

}

    public List selectRS() {
        List rsall = new ArrayList();
        Map rsTree;

        try {
            conn = DBConnManager.getInstance();
            con = conn.getConnection(defaultname);
            st = con.createStatement();
            rsc = st.executeQuery(Counter);
            while (rsc.next()) {
                intRowCount = rsc.getInt("allrow");
            }

            stmt = con.prepareCall("{call p_show('" + sql + "'," + intPageSize + "," + intPage + ")}");//如果用别的数据库��把�q�个地方修改一�?br />            rs = stmt.executeQuery();
            ResultSetMetaData rsmd = rs.getMetaData();
            int numberOfColumns = rsmd.getColumnCount();
            //Object[] aa = new Object[numberOfColumns-1];
            intPageCount = (intRowCount + intPageSize - 1) / intPageSize;
            while (rs.next()) {
                rsTree = new HashMap(numberOfColumns);
                for (int r = 1; r < numberOfColumns + 1; r++) {
                    rsTree.put(rsmd.getColumnName(r).toLowerCase(), rs.getObject(r));//toLowerCase()�q�个地方把列名�{化�ؓ��写是�ؓ了和oracle兼容
                }
                rsall.add(rsTree);
            }
        } catch (java.lang.Exception ex) {
            System.out.println("db conn has a Exception !!!!");
            if(ex.toString().indexOf("peer")>0||ex.toString().indexOf("reset")>0) //一般连接池都没有自动重�q�功能，�q�里是当数据库连接异常后�Q�进行重新初始化�q�接。不然即使网�l�正�怺��Q�数据库�q�接也不会恢�?br />                DBConnManager.reConnect();

            ex.printStackTrace();
        } finally {
            try {
                if (rsc != null)
                    rsc.close();
                if (st != null)
                    st.close();
                if (rs != null)
                    rs.close();
                if (stmt != null)
                    stmt.close();
                if (conn != null)
                    conn.releaseConnection(defaultname, con);
            } catch (Exception e) {
                System.out.println(e);
            }
        }
        return rsall;
    }

    public String ChangePage(HttpServletRequest request) {
        String urlchange = null;
        String pagename = request.getRequestURI().substring(request.getRequestURI().lastIndexOf("/") + 1);
        String url = getUrl(request);
        String dol = "";
        if (url != null && !url.equals(""))
            dol = "&";
        if (intPage > 1 && intPage < intPageCount) {
            urlchange = "上一��?lt;/a> | 下一��?lt;/a> | �W? + intPage + "��?| �? + intPageCount + "��?| �? + intRowCount + "�?;
        } else if (intPage == 1 && intRowCount <= intPageSize) {
            urlchange = "上一��?| 下一��?| �W? + intPage + "��?| �? + intPageCount + "��?| �? + intRowCount + "�?;
        } else if (intPage == intPageCount && intPage != 1) {
            urlchange = "上一��?lt;/a> 下一��?| �W? + intPage + "��?| �? + intPageCount + "��?| �? + intRowCount + "�?;
        } else if (intPage == 1 && intRowCount >= intPageSize) {
            urlchange = "上一��?| 下一��?lt;/a> | �W? + intPage + "��?| �? + intPageCount + "��?| �? + intRowCount + "�?;
        } else {
            urlchange = "�W�一��?lt;/a>";
        }
        return urlchange;
    }

    public String ChangeBar(HttpServletRequest request) {
        String urlchange = null;
        String pagename = request.getRequestURI().substring(request.getRequestURI().lastIndexOf("/") + 1);
        String url = getUrl(request);
        String dol = "";
        if (url != null && !url.equals(""))
            dol = "&";
        if (intPage > 1 && intPage < intPageCount) {
            urlchange = "上一��?lt;/a> | 下一��?lt;/a> | �W? + intPage + "��?| �? + intPageCount + "��?;
        } else if (intPage == 1 && intRowCount <= intPageSize) {
            urlchange = "上一��?| 下一��?| �W? + intPage + "��?| �? + intPageCount + "��?;
        } else if (intPage == intPageCount && intPage != 1) {
            urlchange = "上一��?lt;/a> 下一��?| �W? + intPage + "��?| �? + intPageCount + "��?;
        } else if (intPage == 1 && intRowCount >= intPageSize) {
            urlchange = "上一��?| 下一��?lt;/a> | �W? + intPage + "��?| �? + intPageCount + "��?;
        } else {
            urlchange = "�W�一��?lt;/a>";
        }
        return urlchange;
    }

    public int getTotal() {
        return intRowCount;
    }

    public int getPageCount() {
        return intPageCount;
    }

    public String gotoPage(HttpServletRequest request) {
        String url = getUrl(request);
        String javascript = "";
        String form = "\n" + javascript;
        form += "\n\n\n ";
        if (url != null) {
            if (url.indexOf("&") > 0) {
                String[] param = new String[(url.split("&")).length];
                param = url.split("&");
                for (int i = 0; i < param.length; i++) {
                    form += "\n";
                }
            } else {
                if (url.indexOf("=") > 0) {
                    form += "\n";
                }
            }
        }
        form += "\n\n\n\n";
        return form;
    }

    private String getUrl(HttpServletRequest request) {
        String url = "";
        Enumeration param = request.getParameterNames();

        while (param.hasMoreElements()) {
            String pname = param.nextElement().toString();
            if (!pname.equalsIgnoreCase("pagenum") && !pname.equalsIgnoreCase("submit"))
                url += pname + "=" + request.getParameter(pname) + "&";

        }
        if (url.endsWith("&")) {
            url = url.substring(0, url.lastIndexOf("&"));
        }
        return url;
    }

    public String intercept(String str, int num, String last) {
        if (str.length() <= num)
            return str;
        else
            return str.substring(0, num) + last;
    }

}

--------------------------------------------------------------------------------------------------------

在action里可以这栯��?br />可以看到action里没有做对传递参数的处理�Q�只需要把request整个传到分页�c�里��可以了
--------------------------------------------------------------------------------------------------------------

   String sql = "select top 100 percent * from usertable";
   String sqlcount = "select count(*) from usertable";//��Z��得到总行�?br />   int pagesize= 18;
   int pagenum = 1;
   if(request.getParameter("pagenum")!=null)
   {
    pagenum = java.lang.Integer.parseInt(request.getParameter("pagenum"));
   }
   ResultGatherPro rs = new ResultGatherPro(sql,pagesize,pagenum,sqlcount);
   request.setAttribute("liststill",rs.selectRS());
   request.setAttribute("changepage",rs.ChangePage(request));
   request.setAttribute("gotopage",rs.gotoPage(request));

-----------------------------------------------------------------------------------------------------------------------------------

最�?jsp里可以这样写

-------------------------------------------------------------------------------------------------------------------------

上面两个一定要讄��filter="false" 不然会过滤html部分

如果用mysql数据�?br />��分��늱��?br />con.prepareCall("{call p_show('" + sql + "'," + intPageSize + "," + intPage + ")}");
�Ҏ��
con.prepareCall(sql+" limit "+(intPage-1)*intPageSize+","+intPageSize);

如果用oracle数据�?br />�Ҏ��
con.prepareCall("SELECT * FROM(SELECT A.*, rownum r FROM("+sql+") A WHERE rownum <= "+intPage*intPageSize+") B WHERE r > "+(intPage-1)
*intPageSize);

最好不要用把所有记录都��d��来然后在其中�q�行分页的方�?/p>

剑事 2005-05-11 16:58 发表评论

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