import java.util.ArrayList; 
import java.util.List; 
import com.yu.entity.User; 
public class PageController { 
private List<User> bigList=new ArrayList<User>(); //大集合，从外界获取 
private List<User> smallList=new ArrayList<User>(); //小集合，返回给调用它的类 
private static int curentPageIndex=1; //当前页码 
private int countPerpage=10; //每页显示条数 
private int pageCount; //总页数 
private int recordCount; //总记录条数 
//初始化块，调用类的时候首先自动加载 
{ 
//调用查询数据库的方法，返回一个List 
this.bigList = new Utils().query(); 
//计算总页数 
if (bigList.size()%countPerpage==0) { 
this.pageCount=bigList.size()/countPerpage; 
} else { 
this.pageCount=(bigList.size()/countPerpage)+1; 
} 
} 
public PageController() { 
} 
//传入指定页码的构造函数，参看第几页。 
public PageController(int curentPageIndex){ 
this.curentPageIndex=curentPageIndex; 
} 
//确切的获取当前页的记录，返回一个list列表 
public List<User> setCurentPageIndex() { 
return select(); 
} 
//下一页 
public List<User> nextPage() { 
if (curentPageIndex < pageCount ) { 
curentPageIndex++; 
System.out.println("当前页:"+curentPageIndex); 
} 
return select(); 
} 
//上一页 
public List<User> previousPage() { 
if (curentPageIndex > 1) { 
curentPageIndex--; 
System.out.println("当前页:"+curentPageIndex); 
} 
return select(); 
} 
//此方法供以上方法调用，根据当前页，筛选记录 
public List<User> select(){ 
recordCount=bigList.size(); 
for(int i=(curentPageIndex-1)*countPerpage; i<curentPageIndex*countPerpage&&i<recordCount; i++){ 
smallList.add(bigList.get(i)); 
} 
return smallList; 
} 
} 

//查询上一页 
private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) { 
List<User> newlist = new PageController().previousPage(); 
viewAll(newlist); 
} 
//返回第一页的记录 
private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) { 
List<User> newlist = new PageController(1).setCurentPageIndex(); 
viewAll(newlist); 
} 
//查询下一页 
private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) { 
List<User> newlist = new PageController().nextPage(); 
viewAll(newlist); 
} 
//显示List中的用户 
public void viewAll(List<User> list) { 
Object[][] objects = new Object[(list.size())][]; 
for (int i = 0; i < objects.length; i++) { 
objects[i] = new Object[3]; 
objects[i][0] = i + 1; 
objects[i][1] = list.get(i).getUserid(); 
objects[i][2] = list.get(i).getTruename(); 
} 
jTable1.setModel(new javax.swing.table.DefaultTableModel(objects, 
new String[] { "行号", "工号", "姓名" })); 
}