jsp+servlet+javabean+mysql实现分页。
想要做分页先熟悉数据库，咋们用mysql的sqlserver的以后弄。
看看效果
1.连接数据库大家都应该会吧：分页mysql相对sqlserver简单，
分页mysql例如：
"select * from name limit "+m+","+n+""; 其中m是指记录开始的index，从m开始，n表示几条记录
2.创建分页的javabean
public class Page {
private int totalPagecount=1;//总页数
private int pagesize=10;//每一页显示的记录数；
private int totalcount=0;//记录总数；
private int currpageno=1;//当前页码；
List namesList;//实体集合
public int getTotalPagecount() {
return totalPagecount;
}
public void setTotalPagecount(int totalPagecount) {
this.totalPagecount = totalPagecount;
}
public int getPagesize() {
return pagesize;
}
public void setPagesize(int pagesize) {
if(this.pagesize>0)
this.pagesize = pagesize;
}
public int getTotalcount() {
return totalcount;
}
public void setTotalcount(int totalcount) {
if(totalcount>0)
this.totalcount = totalcount;
//计算总页数
totalPagecount=totalcount%pagesize==0?(totalcount/pagesize)
:totalcount/pagesize+1;
}
public int getCurrpageno() {
return currpageno;
}
public void setCurrpageno(int currpageno) {
this.currpageno = currpageno;
}
public List getNamesList() {
return namesList;
}
public void setNamesList(List namesList) {
this.namesList = namesList;
}
}
3.创建对象实体
//我的对象就3条记录大家根据自己数据库创建
public class Name {
private int id;
private String name;
private String img;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getImg() {
return img;
}
public void setImg(String img) {
this.img = img;
}
}
4.下来应该从数据库查表多少条数据和显示的数据了
4.1查询对少条记录的mysql
select count(*) as tc from name4.2连接数据库查找数据的dao如果不会连接数据库看这里 数据库连接
public class PageDao {
private static ComboPooledDataSource datasource;
private static Connection con;
static {
datasource=new ComboPooledDataSource();
try {
con=datasource.getConnection();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
* 获取总条数
*/
public int getTotalCount() {
String sql="select count(*) as tc from name";
PreparedStatement ps;
int totalcount = 0;
try {
ps = con.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
while(rs.next()) {
totalcount=rs.getInt("tc");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return totalcount;
}
/*
* pagesize//每一页显示的记录数
* pageno //页码
*/
public List getPageNameList(int pageno,int pageSize) throws SQLException{
String sql="select * from name limit "+pageSize*(pageno-1)+","+pageSize+"";
//从多少个显示，显示多少个
PreparedStatement ps=con.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
List listname = new ArrayList<>();
while(rs.next()) {
Name name=new Name();
name.setId(rs.getInt("id"));
name.setName(rs.getString("name"));
name.setImg(rs.getString("image"));
listname.add(name);
}
return listname;
}
}
5,接下来去servlet里面去掉用对应的方法，这个方法已经把对象传给前面也面了。也面用el表达式获取值。
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import huomin.Dao.PageDao;
import huomin.entity.Name;
import huomin.entity.Page;
@WebServlet("/NewFile")
public class NewFileServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String currpageno = req.getParameter("page");
String pageSize = req.getParameter("pageSize");
Page p=new Page();
if(pageSize!=null|| pageSize!="") {
p.setPagesize(Integer.parseInt(pageSize));
}
System.out.println("3333333333333333333333333333=="+currpageno);
if(currpageno==null||currpageno=="") {
p.setCurrpageno(1);
}else {
p.setCurrpageno(Integer.parseInt(currpageno));
}
PageDao pd=new PageDao();
System.out.println(pd.getTotalCount());
p.setTotalcount((pd.getTotalCount()));
List pageList=new ArrayList<>();
try {
pageList = pd.getPageNameList(p.getCurrpageno(), p.getPagesize());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// TODO Auto-generated method stub
req.setAttribute( "Page",p);
req.setAttribute( "pageList",pageList);
req.getRequestDispatcher("/NewFile.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(req, resp);
}
}
6，下来就是在jsp也面获取，我也面做得非常简单，不喜欢做前端功能基本都实现了
Insert title here
;这就一个分页结束。