java+jsp+servlet实现分页

web.xml配置：

<servlet>
    <servlet-name>abc</servlet-name>
    <servlet-class>test.pageServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>abc</servlet-name>
    <url-pattern>/insertstu</url-pattern>
  </servlet-mapping>

ConnectionTest.Java

package test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class ConnectionTest {

    public static  Statement returnConn() throws SQLException{
      // String name="com.mysql.jdbc.Driver";
       String url="jdbc:mysql://localhost:3306/page";
       String user="root1";
       String password="123456";
       //加载驱动
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
       //连接数据库
        Connection conn=DriverManager.getConnection(url, user, password);
        Statement st=conn.createStatement();
        return st;

    }

    public void closeIo(Connection conn,Statement st) throws SQLException{
        conn.close();
        st.close();
    }

}

PageView.java

package test;

import java.util.List;

public class PageView {
     private List<Student> records;// 记录
     private Long totalrecordnumber;// 总记录数
     private Integer startindex;// 第一页
     private Integer endindex;// 最后一页
     private Integer totalpagenumber;// 总页数
     private Integer currentpage;// 当前页
     public PageView(List<Student> records, Long totalrecordnumber, int currentpage,
       int maximum, int viewperpage)
     // 构造函数
     {
      this.records = records;
      this.totalrecordnumber = totalrecordnumber;
      this.currentpage = currentpage;
      totalpagenumber = (int) (totalrecordnumber % maximum == 0 ? totalrecordnumber
        / maximum
        : totalrecordnumber / maximum + 1);//获得总页数
      setIndex(currentpage, viewperpage, totalpagenumber);
     }
     public List<Student> getRecords() {
      return records;
     }
     public Long getTotalrecordnumber() {
      return totalrecordnumber;
     }
     public Integer getStartindex() {
      return startindex;
     }
     public Integer getEndindex() {
      return endindex;
     }
     public Integer getTotalpagenumber() {
      return totalpagenumber;
     }
     public Integer getCurrentpage() {
      return currentpage;
     }
    //获得总页数 显示页数 当前页数 第一页 最后一页
     public void setIndex(int currentpage, int viewperpage, int totalpagenumber) {
      if (viewperpage >= totalpagenumber) {
       startindex = 1;
       endindex = totalpagenumber;
      } else {
       if (currentpage <= viewperpage / 2) {
        startindex = 1;
        endindex = viewperpage;
       } else if ((currentpage + viewperpage / 2) > totalpagenumber) {
        startindex = totalpagenumber - viewperpage + 1;
        endindex = totalpagenumber;
       } else {
        startindex = currentpage - (viewperpage - 1) / 2;
        endindex = currentpage + viewperpage / 2;
       }
      }
     }
}

Student.java

package test;

import java.util.Date;

public class Student {
   private int id;
   private String name;
   private int age;
   private String sex;
   private Date birth;
public Student() {
    super();
}
public Student(int id, String name, int age, String sex, Date birth) {
    super();
    this.id = id;
    this.name = name;
    this.age = age;
    this.sex = sex;
    this.birth = birth;
}
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 int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}
public String getSex() {
    return sex;
}
public void setSex(String sex) {
    this.sex = sex;
}
public Date getBirth() {
    return birth;
}
public void setBirth(Date birth) {
    this.birth = birth;
}

}

pageServlet.java

package test;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;  

public class pageServlet extends HttpServlet {
    public static  Statement returnConn() throws SQLException{
          // String name="com.mysql.jdbc.Driver";
           String url="jdbc:mysql://localhost:3306/page";
           String user="root1";
           String password="123456";
           //加载驱动
            try {
                Class.forName("com.mysql.jdbc.Driver");
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
           //连接数据库
            Connection conn=DriverManager.getConnection(url, user, password);
            Statement st=conn.createStatement();
            return st;

        }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //showone(request,response);
        try {
            showtwo(request,response);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }  

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       doGet(request, response);
    }  

    public void showone(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
         try {
            Statement st=returnConn();
            String sql="select * from student";
            ResultSet rs=st.executeQuery(sql);
            List<Student>  list=new ArrayList<Student>();
            while(rs.next()){
                int id=rs.getInt("id");
                String name=rs.getString("name");
                int age=rs.getInt("age");
                String sex=rs.getString("sex");
                Date birth=rs.getDate("birth");
                Student stu=new Student(id,name,age,sex,birth);
                list.add(stu);
            }

            //response.sendRedirect("studentlist.jsp");
            request.setAttribute("list", list);
            request.getRequestDispatcher("studentlist.jsp").forward(request, response);

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    public void showtwo(HttpServletRequest request, HttpServletResponse response) throws SQLException, ServletException, IOException{

         // 当前是第几页
          String currentpageStr = request.getParameter("currentpage") == null ? "1"
            : request.getParameter("currentpage");
          int currentpage = Integer.parseInt(currentpageStr);
          // 每页显示多少条
          int maximum = 5;
          // 可以显示多少页
          int viewperpage = 5;

          Statement st=returnConn();
          String sql="select * from student limit "+ (currentpage - 1) * maximum + "," + maximum;
          ResultSet rs=st.executeQuery(sql);
            List<Student>  list=new ArrayList<Student>();
            while(rs.next()){
                int id=rs.getInt("id");
                String name=rs.getString("name");
                int age=rs.getInt("age");
                String sex=rs.getString("sex");
                Date birth=rs.getDate("birth");
                Student stu=new Student(id,name,age,sex,birth);
                list.add(stu);
            }
             String sql2="select * from student";
              ResultSet rs2=st.executeQuery(sql2);
                int count=0;
              while(rs2.next()){
                   count++;
                }

            long totalrecordnumber=count;
             // 将数据都封装到pageView
            PageView pageView =new PageView(list, totalrecordnumber, currentpage, maximum, viewperpage);
             // PageView<Student> pageView = new PageView<Student>(records,totalrecordnumber, currentpage, maximum, viewperpage);
              request.setAttribute("pageView", pageView);
              request.setAttribute("list", list);
              request.getRequestDispatcher("studentlist.jsp").forward(request, response);

    }
}

jsp页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="test.*" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <script type="text/javascript">

 function topage(currentpage) {
  var form = document.forms[0];
  form.currentpage.value = currentpage;
  form.submit();
 }
</script>

  </head>

  <body>
  <form>
   <input type="hidden" name="currentpage" />
    <table align="center" style="width: 60%;" border="1">
       <tr>
         <th>学生编号</th>
         <th>学生姓名</th>
         <th>学生年龄</th>
         <th>学生性别</th>
         <th>学生生日</th>
       </tr>
      <c:forEach items="${requestScope.list}" var="list">
       <tr>
            <td>${list.id }</td>
             <td>${list.name }</td>
              <td>${list.age }</td>
               <td>${list.sex }</td>
                <td>${list.birth}</td>        

       </tr>
      </c:forEach>

   </table>
   <div align="right" style="width: 80%">
  <c:forEach begin="${pageView.startindex}" end="${pageView.endindex}"
   var="wp">
   <c:if test="${pageView.currentpage==wp}">
    <b>[${wp}]</b>
   </c:if>
   <c:if test="${pageView.currentpage!=wp}">
    <a href="javascript:topage('${wp}')">[${wp}]</a>
   </c:if>
  </c:forEach>
                            总共${pageView.totalrecordnumber}页
    </div>
  </form>

  </body>
</html>