本文主要是介绍081108 GWT分页显示数据，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
基于上一篇日志的实例的基础上修改：CRUDService.java：
package client;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.core.client.GWT;
public interface CRUDService extends RemoteService {
Student[] getStudent(String PageNum) ;
String getPagenum();
public static class App {
private static CRUDServiceAsync ourInstance = null;
public static synchronized CRUDServiceAsync getInstance() {
if (ourInstance == null) {
ourInstance = (CRUDServiceAsync) GWT.create(CRUDService.class);
((ServiceDefTarget) ourInstance).setServiceEntryPoint(GWT.getModuleBaseURL() + "CRUD/CRUDService");
}
return ourInstance;
}
}
}
CRUDServiceImpl.java：
package server;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import client.CRUDService;
import client.Student;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Hibernate;
import org.hibernate.Query;
import org.hibernate.cfg.Configuration;
import java.util.List;
import java.util.Iterator;
public class CRUDServiceImpl extends RemoteServiceServlet implements CRUDService {
private static final SessionFactory sessionFactory;
String Pagenum = "1";
static {
try {
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public List ListStudent(String PageNum){
Session session = getSessionFactory().getCurrentSession() ;
session.beginTransaction();
Query query = session.createSQLQuery("select * from t_student")
.addScalar("id", Hibernate.LONG)
.addScalar("name", Hibernate.STRING)
.addScalar("email", Hibernate.STRING);
int PageSize = 10;
try{
if (Integer.parseInt(PageNum)!=0 | PageNum!=null ){
query.setFirstResult((Integer.parseInt(PageNum)-1) * PageSize);
query.setMaxResults(PageSize);
}else{
query.setFirstResult(0);
query.setMaxResults(PageSize);
}
}catch(Exception e){
query.setFirstResult(0);
query.setMaxResults(PageSize);
}
List ls = query.list();
session.getTransaction().commit();
return ls;
}
public int CountStudent(){
Session session = getSessionFactory().getCurrentSession() ;
session.beginTransaction();
List ls = session.createSQLQuery("select count(*) from t_student").list();
session.getTransaction().commit();
return Integer.parseInt(ls.iterator().next().toString());
}
public Student[] getStudent(String PageNum){
this.setPagenum(PageNum);
Student[] student = new Student[this.CountStudent()];
int i = 0;
for(Iterator it = this.ListStudent(PageNum).iterator();it.hasNext();i++) {
Object[] ob = (Object[] )it.next();
student[i]=new Student(ob[0].toString(),ob[1].toString(),ob[2].toString());
}
return student;
}
public void setPagenum(String pagenum){
this.Pagenum = pagenum;
}
public String getPagenum() {
return Pagenum; //To change body of implemented methods use File | Settings | File Templates.
}
}
CRUDServiceAsync.java :
package client;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface CRUDServiceAsync {
void getStudent(String PageNum, AsyncCallback async);
void getPagenum(AsyncCallback async);
}
package client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.*;
import com.google.gwt.user.client.rpc.AsyncCallback;
public class CRUD implements EntryPoint {
private CRUDServiceAsync crudServiceAsync ;
VerticalPanel main = new VerticalPanel();
FlexTable lb = new FlexTable();
HorizontalPanel hp = new HorizontalPanel();
Button nextpage = new Button("nextpage");
Button prepage = new Button("prepage");
private String pagenum = "1";
public void setPagenum(String pagenum){
this.pagenum=pagenum;
}
public String getPagenum(){
return this.pagenum;
}
int prepagenum = 1;
int nextpagenum =1;
public void onModuleLoad() {
main.add(lb);
main.add(hp);
hp.add(prepage);
hp.add(nextpage);
RootPanel.get().add(main);
showstudentlist("1");
prepage.addClickListener(new ClickListener(){
public void onClick (Widget sender){
prepagenum = Integer.parseInt(getPagenum())-1;
showstudentlist(String.valueOf(prepagenum));
}
});
nextpage.addClickListener(new ClickListener(){
public void onClick (Widget sender){
nextpagenum = Integer.parseInt(getPagenum())+1 ;
showstudentlist(String.valueOf(nextpagenum));
}
});
}
private void showstudentlist(String pagenum) {
CRUDService.App.getInstance().getStudent(pagenum,new AsyncCallback(){
public void onFailure(Throwable caught) {
}
public void onSuccess(Object result) {
Student s[] = ( Student[])result ;
for (int i=0;i<=s.length;i++){
lb.setText(i,0,s[i].id);
lb.setText(i,1,s[i].name);
lb.setText(i,2,s[i].email);
}
}
});
CRUDService.App.getInstance().getPagenum(new AsyncCallback(){
public void onFailure(Throwable caught) {}
public void onSuccess(Object result) {
setPagenum((String)result);
}
});
}
}
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