以最简单的方式实现jsp+mysql分页

刚开始弄 ,目前分页是在前台jsp中实现的 与bean相比 这样比较容易一些

先把代码贴出来 正在研究怎么样用bean实现分页 等弄好了 再贴代码

下面说下分页理论 select * from message order by time desc limit begin,size

begin 数据记录从第几条开始 begin=(当前页数-1)*size

size 每页的记录数

下面是连接数据库的javabean;

   1: package bean;

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   2: import java.sql.*;

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   3: 

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   4: public class MyDb{

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   5:     private Statement stmt;

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   6:     private Connection conn=null;

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   7:     private ResultSet rs=null;

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   8:     

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   9:     public void connection(String db_name,String user,String pwd) throws  Exception{

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  10:         Class.forName("com.mysql.jdbc.Driver");

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  11:         String url="jdbc:mysql://localhost:3306/" + db_name;

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  12:         conn=DriverManager.getConnection(url,user,pwd);

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  13:         stmt=conn.createStatement();

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  14:     }

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  15:     

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  16:     public ResultSet query(String sql) throws Exception{

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  17:         rs=stmt.executeQuery(sql);

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  18:         return rs;

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  19:     }

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  20:     

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  21:     public ResultSet query(String sql,int begin,int size) throws Exception{

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  22:         String s=" limit " + begin + "," +size;

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  23:         sql=sql + s;

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  24:         rs=stmt.executeQuery(sql);

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  25:         return rs;

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  26:     }

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  27: 

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  28:     

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  29:     public int update(String sql) throws  Exception{

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  30:         int n=0;

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  31:         n=stmt.executeUpdate(sql);

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  32:         return n;

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  33:     }

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  34:     

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  35:     public boolean delete(String sql) throws  Exception{

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  36:         boolean flag=false;

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  37:         flag=stmt.execute(sql);

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  38:         return flag;

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  39:     }

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  40: }

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下面是jsp的代码;

   1: <jsp:useBean id="db" class="bean.MyDb" scope="page" />

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   2: <%

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   3: int page_count;    //总页数

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   4: int p;    //当前面号

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   5: int size=3;    //每页记录数

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   6: int result_count;    //总记录数

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   7: int begin;    //当前页第一条记录索引号

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   8: ResultSet rs=null;

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   9: String page_s=request.getParameter("page");

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  10: if(page_s==null)    page_s="1";

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  11: db.connection("test","root","root");

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  12: String sql="select count(*) from message";

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  13: rs=db.query(sql);

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  14: rs.next();

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  15: result_count=rs.getInt(1); 

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  16: page_count=(result_count + size - 1)/size;

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  17: p=Integer.parseInt(page_s);

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  18: out.println("总记录数为:" + result_count + "     每页记录数为:" + size + "     总页数为:" + page_count + "     当前是第" + p + "页");

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  19: sql="select * from message order by time desc";

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  20: begin=(p-1)*size;

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  21: rs=db.query(sql,begin,size);

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  22: while(rs.next()){

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  23: %>

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  24: <table>

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  25: <tr>

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  26: <td  width="200"><%=rs.getString(1)%></td>

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  27: <td width="200"><%=rs.getString(2)%></td>

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  28: </tr>

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  29: <tr>

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  30: <td><%=rs.getString(3)%></td>

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  31: <td><%=rs.getString(4)%></td>

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  32: </tr>

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  33: <tr><td colspan="2"><%=rs.getString(5)%></td></tr>

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  34: <tr><td colspan="2"><hr /></td></tr>

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  35: </table>

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  36: <%

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  37: }

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  38: if(p>1)    out.println("<a href=test.jsp?page=" + (p-1) + ">上一页</a>");

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  39: if(p<page_count)    out.println("<a href=test.jsp?page=" + (p+1) + ">下一页</a>");

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  40: %>

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代码很粗糙, 将就着看吧 但是很适合新手学习.. 完全是自己写的..

等把bean写好了 传上来大家分享.