用struts2實現 完整版分頁程式碼
1. userPojo.java原始碼
public class FenyePojo {
private Integer numsOfPage;// 每頁顯示多少條資料
private Integer page;// 當前顯示第幾頁
private Integer nums;// 總共多少條資料
private Integer ys;// 總共多少頁（計算出來的）
// 顯示第一頁的5條資料
public FenyePojo(){
this("1","5");
}
public FenyePojo(String page , String numsOfPage){
this.page = Integer.valueOf(page);
this.numsOfPage = Integer.valueOf(numsOfPage);
}
public void setNums(Integer nums) {
// 計算一下總頁數：總條目數除以每頁顯示的條目數：nums/numsOfPage
double a = nums;
double b = numsOfPage;
this.ys = (int)Math.ceil(a/b);
this.nums = nums;
} //
set/get
2. main.jsp原始碼
<body>
<table id="tab">
<tr>
<th>姓名</th>
<th>性別</th>
</tr>
<s:iterator value="userList" var="e" status="i">
<tr>
<td>${e.username }</td>
<td>${e.gender }</td>
</tr>
</s:iterator>
</table>
<div id="fenye">
<s:if test="fenye.page == 1">上一頁</s:if>
<s:else>
<a href="<%=path%>/userAction!retrieve.action?
fenye.page=${fenye.page - 1}">
上一頁
</a>
</s:else>
<s:if test="fenye.page == fenye.ys">
下一頁
</s:if>
<s:else>
<a href="<%=path%>/userAction!retrieve.action?
fenye.page=${fenye.page + 1}">
下一頁
</a>
</s:else>
當前第${fenye.page}頁面 / 總共${fenye.ys}頁
</div>
</body>
3. UserAction.java原始碼
public class UserAction extends ActionSupport{
private UserService service = new UserService();
private List<Map<String,Object>> userList;
private UserPojo user;
private FenyePojo fenye;
public String retrieve(){
// 第一頁的五條資料
if(fenye == null){
fenye = new FenyePojo();
} u
serList = service.retrieveAllUser(fenye);
return "toMain";
} //
set/get
}
4. UserService.java原始碼
public class UserService {
private UserDao dao = new UserDao();
public List<Map<String, Object>> retrieveAllUser(FenyePojo fenye) {
return dao.retrieveAllUser(fenye);
}
}
5. UserDao.java原始碼
public class UserDao {
private JDBC jdbc = new JDBC();
public List<Map<String, Object>> retrieveAllUser(FenyePojo fenye) {
int a = fenye.getPage();
int b = fenye.getNumsOfPage();
String sql = "select * from db_user limit "+((a-1)*b)+","+b;
Map<String, Object> map = jdbc.retrieveOne("select count(*) as tms
from db_user");
long tms = (long)map.get("tms");
fenye.setNums((int)tms);
return jdbc.retrieveAll(sql);
}
}