Struts分页显示实现-优快云博客

Struts 分页显示
分页类 Page.java:
public class Page {
    int currentPage=1;//当前页数 
    int totalPages=0;//总页数 
    int pageRecorders=3;//每页显示数 
    int totalRows=0;//总数据数 
    int pageStartRow=0;//每页的起始数 
    int pageEndRow;//每页的终止数 
    boolean hasNextPage=false;//是否有下一页 
    boolean hasPreviousPage=false;//是否有前一页 
    List<Country> list;
    public Page(){}
    public Page(List<Country> list)
    {
        //初始化所有参数
     this.list=list;
     totalRows=list.size();
     currentPage=1;
     hasPreviousPage=false;
     totalPages=totalRows%pageRecorders==0?totalRows%pageRecorders:totalRows%pageRecorders+1;
     if(currentPage>=totalPages) {
      hasNextPage=false;
         }
         else {
            hasNextPage=true;
         }
       if(totalRows<pageRecorders) {
             this.pageStartRow=0;
             this.pageEndRow=totalRows;
         }
         else {
             this.pageStartRow=0;
             this.pageEndRow=pageRecorders;
         }
    }
    public void setList(List<Country> list) {
        this.list = list;
    }
    public int getTotalRows() {
        return totalRows;
    }
    public int getCurrentPage() {
        return currentPage;
    }
    public boolean isHasNextPage() {
        return hasNextPage;
    }
    public boolean isHasPreviousPage() {
        return hasPreviousPage;
    }
    public int getTotalPages() {
        return totalPages;
    }
    public List<Country> getList(int curpage) {
        this.currentPage=curpage;
        if(currentPage*pageRecorders<totalRows) {
            pageEndRow=currentPage*pageRecorders;
            pageStartRow=pageEndRow-pageRecorders;
           }
        else{
            pageEndRow=totalRows;
            pageStartRow=pageRecorders*(totalPages-1);
          }
        return list.subList(pageStartRow,pageEndRow);
    }
    public List<Country> getNextPage() {
        currentPage=currentPage+1;
        if((currentPage-1)>0) {
            hasPreviousPage=true;
         }
        else {
            hasPreviousPage=false;
        }
        if(currentPage>=totalPages) {
            hasNextPage=false;
        }
        else {
            hasNextPage=true;
        }
        List<Country> list=this.getList(currentPage);
        return list;
    }
    public List<Country> getPreviousPage() {
        currentPage=currentPage-1;
        if(currentPage==0) {
            currentPage=1;
        }
        if(currentPage>=totalPages) {
            hasNextPage=false;
        }
        else {
            hasNextPage=true;
        }
        if((currentPage-1)>0) {
            hasPreviousPage=true;
        }
        else {
            hasPreviousPage=false;
        }
        List<Country> list=this.getList(currentPage);
        return list;
    }
}
Action:
public class PageListActionAction extends Action {
    List<Country> list=new ArrayList<Country>();
    Page pd;
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {
        String action;
        int pageNum=1;
        action=request.getParameter("action");
       if(action==null||action.equals("")) {
         try {
             list=Dbutil.getBindTable();
            }
           catch(Exception e) {
                e.printStackTrace();
            }
            pd=new Page(list);
            List<Country> country=pd.getList(pageNum);
            request.getSession().setAttribute("list",country);
            request.getSession().setAttribute("pa",pd);
        }
      else {
          if(action=="nextPage"||action.equals("nextPage")) {
             List<Country> country=pd.getNextPage();
             request.getSession().setAttribute("list",country);
             request.getSession().setAttribute("pa",pd);
            }
         if(action=="previousPage"||action.equals("previousPage")) {
            List<Country> country=pd.getPreviousPage();
            request.getSession().setAttribute("list",country);
            request.getSession().setAttribute("pa",pd);
         }
     }
      return mapping.findForward("success");
    }
}
jsp:
<html>
  <head>
     <title></title>
 </head>
  <body>
      <table border="1">
      <logic:present name="list">
      <logic:iterate id="li" name="list" scope="session">
      <logic:present name="li">
        <tr>
          <td><bean:write name="li" property="countryID"/></td>
          <td><bean:write name="li" property="description"/></td>
        </tr>
        </logic:present>
       </logic:iterate>
       </logic:present>
      </table>
     
   <logic:equal name="pa" property="hasNextPage" value="true">
  <html:link page="/pageListAction.do?action=nextPage">nextPage</html:link> 
  </logic:equal> 
 <logic:notEqual name="pa" property="hasPreviousPage" value="true">
   PreviousPage
  </logic:notEqual>
  <logic:equal name="pa" property="hasPreviousPage" value="true">
<html:link page="/pageListAction.do?action=previousPage">PreviousPage</html:link>
</logic:equal>
   <logic:notEqual name="pa" property="hasNextPage" value="true">
  nextPage
  </logic:notEqual>
 共有数据总数<bean:write name="pa" property="totalRows"/>;
共分<bean:write name="pa" property="totalPages"/>页,当前是第
<bean:write name="pa" property="currentPage"/>页
  </body>
</html>
查询类:
    public static List<Country> getBindTable()
    {
        Country  country=null;
        List<Country> list=new ArrayList<Country>();
        try { 
            Class.forName("org.gjt.mm.mysql.Driver"); 
            Connection c = DriverManager.getConnection
("jdbc:mysql://192.168.0.11/database_name?user=root&password=0"); 
            Statement s = c.createStatement(); 
            ResultSet r =s.executeQuery("select ID,Country_ID,Description from 
country_"); 
            while(r.next()) {
                country=new Country();
             country.setID(r.getInt("ID"));
             country.setCountryID(r.getString("Country_ID"));
             country.setDescription(r.getString("Description"));
             list.add(country);
            //System.out.println(r.getString("Country_ID"));  
            } 
            s.close(); // Also closes ResultSet  
            } catch(Exception e) {e.printStackTrace();} 
            return list;
    }