JSP---分页

1、建立java类

public class StudentManage {
 int pageSize = 3;//每页记录数

//获取记录总数
private int getTotalNum(String strWhere) throws SQLException {
DbAccess dbAccess = new DbAccess();
int total = 0;
String sql = "select count(*) from student where 1=1 and " + strWhere;
dbAccess.excuteQuery(sql);
ResultSet rs = dbAccess.getRs();
if (rs.next()) {
 total = rs.getInt(1);
}
dbAccess.close();
return total;
}

//获取总页数（即最大的页号）
public int getMaxPageNo(String strWhere) throws SQLException {
int maxPageNo;
if(getTotalNum(strWhere)%pageSize==0)
 maxPageNo=getTotalNum(strWhere)/pageSize;
else {
 maxPageNo=getTotalNum(strWhere)/pageSize+1;
}
return maxPageNo;
}

// 获取指定页的记录
public List<Student> StudList(String strWhere, int page)
throws SQLException {
DbAccess dbAccess = new DbAccess();
List<Student> list = new ArrayList<Student>();
int total=getTotalNum(strWhere);
String sql = "select * from student where 1=1 and " + strWhere;
dbAccess.excuteQuery(sql);
ResultSet rs = dbAccess.getRs();
int t = (page - 1) * pageSize + 1;//当前页的首记录号
if (t <= total) {
 rs.absolute(t);//需要修改DAL层　st = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
 do {
  Student student = new Student();
  student.setStud_id(rs.getString("stud_id"));
  student.setStud_name(rs.getString("stud_name"));
  student.setStud_sex(rs.getString("stud_sex"));
  student.setStud_class(rs.getString("stud_class"));
  student.setStud_fav(rs.getString("stud_fav"));
  list.add(student);
  } while (rs.next() && list.size() < pageSize);
 rs.close();
 }
 dbAccess.close();
 return list;
}

2、jsp页面调用

<%
String curPage = request.getParameter("curPage");
if (curPage == null || curPage == "") {
 curPage = "1";
}
int cp = Integer.parseInt(curPage);
StudentManage studentManage = new StudentManage();
int lastPage = studentManage.getMaxPageNo("1=1");
List<Student> list = studentManage.StudList("1=1", cp);
%>

当前第<%=cp%>/<%=lastPage%>页

<%
if (cp > 1) {
%>
<a href="?curPage=1">第一页</a>&nbsp;
<a href="?curPage=<%=cp - 1%>">上一页</a>
<%
}
%>
<%
if (cp < lastPage) {
%>
<a href="?curPage=<%=cp + 1%>">下一页</a>&nbsp;
<a href="?curPage=<%=lastPage%>">最后一页</a>
<%
}
%>