Oracle下的Java分页功能_动力节点Java学院整理

package com.bjpowernode.test;
import java.util.List;
public class PageModel<E> {
private List<E> list;
private int pageNo;
private int pageSize;
private int totalNum;
private int totalPage;
public List<E> getList() {
return list;
}
public void setList(List<E> list) {
this.list = list;
}
public int getPageNo() {
return pageNo;
}
public void setPageNo(int pageNo) {
this.pageNo = pageNo;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalNum() {
return totalNum;
}
public void setTotalNum(int totalNum) {
this.totalNum = totalNum;
setTotalPage((getTotalNum() % pageSize) == 0 ? (getTotalNum() / pageSize)
: (getTotalNum() / pageSize + 1));
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
// 获得第一页
public int getFirstPage() {
return 1;
}
// 获得最后页
public int getLastPage() {
return totalPage;
}
// 获得前页
public int getPrePage() {
if (pageNo > 1)
return pageNo – 1;
return 1;
}
// 获得后页
public int getBackPage() {
if (pageNo < totalPage)
return pageNo + 1;
return totalPage;
}
// 判断’首页’及‘前页’会不会可用
public String isPreable() {
if (pageNo == 1)
return “disabled”;
return “”;
}
// 判断’尾页’及‘下页’会不会可用
public String isBackable() {
if (pageNo == totalPage)
return “disabled”;
return “”;
}
}

package com.bjpowernode.test;
import java.io.*;
import java.util.*;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import kane.UserInfo;
import kane.UserInfoManage;
import kane.PageModel;
public class UserBasicSearchServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private int pageSize = 0;
@Override
public void init(ServletConfig config) throws ServletException {
pageSize = Integer.parseInt(config.getInitParameter(“pageSize”));
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// 1.获得页面参数并构造参数对象
int pageNo = Integer.parseInt(req.getParameter(“pageNo”));
String sex = req.getParameter(“gender”);
String home = req.getParameter(“newlocation”);
String colleage = req.getParameter(“colleage”);
String comingyear = req.getParameter(“ComingYear”);
UserInfo u = new UserInfo();
u.setSex(sex);
u.setHome(home);
u.setColleage(colleage);
u.setCy(comingyear);
// 2.调用业务逻辑获得结果集
UserInfoManage userInfoManage = new UserInfoManage();
PageModel<UserInfo> pagination = userInfoManage.userBasicSearch(u,
pageNo, pageSize);
List<UserInfo> userList = pagination.getList();
// 3.封装返回结果
StringBuffer resultXML = new StringBuffer();
try {
resultXML.append(“<?xml version=’1.0′ encoding=’gb18030’?>/n”);
resultXML.append(“<root>/n”);
for (Iterator<UserInfo> iterator = userList.iterator(); iterator
.hasNext();) {
UserInfo userInfo = iterator.next();
resultXML.append(“<data>/n”);
resultXML.append(“/t<id>” + userInfo.getId() + “</id>/n”);
resultXML.append(“/t<truename>” + userInfo.getTruename()
+ “</ truename >/n”);
resultXML.append(“/t<sex>” + userInfo.getSex() + “</sex>/n”);
resultXML.append(“/t<home>” + userInfo.getHome() + “</home>/n”);
resultXML.append(“</data>/n”);
}
resultXML.append(“<pagination>/n”);
resultXML.append(“/t<total>” + pagination.getTotalPage()
+ “</total>/n”);
resultXML.append(“/t<start>” + pagination.getFirstPage()
+ “</start>/n”);
resultXML.append(“/t<end>” + pagination.getLastPage() + “</end>/n”);
resultXML.append(“/t<pageno>” + pagination.getPageNo()
+ “</pageno>/n”);
resultXML.append(“</pagination>/n”);
resultXML.append(“</root>/n”);
} catch (Exception e) {
e.printStackTrace();
}
writeResponse(req, resp, resultXML.toString());
}
public void writeResponse(HttpServletRequest request,
HttpServletResponse response, String result) throws IOException {
response.setContentType(“text/xml”);
response.setHeader(“Cache-Control”, “no-cache”);
response.setHeader(“Content-Type”, “text/xml; charset=gb18030”);
PrintWriter pw = response.getWriter();
pw.write(result);
pw.close();
}
}

package com.bjpowernode.test;
import java.util.Date;
public class UserInfo {
private int id;
private String username;
private String password;
private String truename;
private String sex;
private Date birthday;
private String home;
private String colleage;
private String comingYear;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getTruename() {
return truename;
}
public void setTruename(String truename) {
this.truename = truename;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getHome() {
return home;
}
public void setHome(String home) {
this.home = home;
}
public String getColleage() {
return colleage;
}
public void setColleage(String colleage) {
this.colleage = colleage;
}
public String getCy() {
return comingYear;
}
public void setCy(String cy) {
this. comingYear= cy;
}
}

package com.bjpowernode.test;
import java.sql.Connection;
import kane.DBUtility;
import kane.PageModel;
public class UserInfoManage {
private UserInfoDao userInfoDao = null;
public UserInfoManage () {
userInfoDao = new UserInfoDao();
}
public PageModel<UserInfo> userBasicSearch(UserInfo u, int pageNo,
int pageSize) throws Exception {
Connection connection = null;
PageModel<UserInfo> pagination = new PageModel<UserInfo>();
try {
connection = DBUtility.getConnection();
DBUtility.setAutoCommit(connection, false);
pagination.setList(userInfoDao.getUserList(u, pageNo, pageSize));
pagination.setPageNo(pageNo);
pagination.setPageSize(pageSize);
pagination.setTotalNum(userInfoDao.getTotalNum(u));
DBUtility.commit(connection);
} catch (Exception e) {
DBUtility.rollBack(connection);
e.printStackTrace();
throw new Exception();
} finally {
DBUtility.closeConnection();
}
return pagination;
}
}

package com.bjpowernode.test;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import kane.UserInfo;
import kane.DBUtility;
public class UserInfoDao {
public List<UserInfo> getUserList(UserInfo userInfo, int pageNo,
int pageSize) throws Exception {
PreparedStatement pstmt = null;
ResultSet rs = null;
List<UserInfo> userList = null;
try {
String sql = “select * from(select rownum num,u.* from(select * from user_info where sex = ? and home like ‘”
+ userInfo.getHome()
+ “%”
+ “‘ and colleage like ‘”
+ userInfo.getColleage()
+ “%”
+ “‘ and comingyear like ‘”
+ userInfo.getCy()
+ “%”
+ “‘ order by id) u where rownum<=?) where num>=?”;
userList = new ArrayList<UserInfo>();
Connection conn = DBUtility.getConnection();
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, userInfo.getSex());
pstmt.setInt(2, pageNo * pageSize);
pstmt.setInt(3, (pageNo – 1) * pageSize + 1);
rs = pstmt.executeQuery();
while (rs.next()) {
UserInfo user = new UserInfo();
user.setId(rs.getInt(“id”));
user.setTruename(rs.getString(“truename”));
user.setSex(rs.getString(“sex”));
user.setHome(rs.getString(“home”));
userList.add(user);
}
} catch (SQLException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
DBUtility.closeResultSet(rs);
DBUtility.closePreparedStatement(pstmt);
}
return userList;
}
public int getTotalNum(UserInfo userInfo) throws Exception {
PreparedStatement pstmt = null;
ResultSet rs = null;
int count = 0;
try {
String sql = “select count(*) from user_info where sex=? and home like ‘”
+ userInfo.getHome()
+ “%”
+ “‘ and colleage like ‘”
+ userInfo.getColleage()
+ “%”
+ “‘ and comingyear like ‘”
+ userInfo.getCy()+ “%” + “‘”;
Connection conn = DBUtility.getConnection();
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, userInfo.getSex());
rs = pstmt.executeQuery();
if (rs.next()) {
count = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
throw new Exception(e);
} finally {
DBUtility.closeResultSet(rs);
DBUtility.closePreparedStatement(pstmt);
}
return count;
}
}

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
public class DBUtility { 
 private static ThreadLocal<Connection> threadLocal = new ThreadLocal<Connection>(); 
 public static Connection getConnection() { 
 Connection conn = null; 
 conn = threadLocal.get(); 
 if (conn == null) { 
  try { 
  Class.forName("oracle.jdbc.driver.OracleDriver"); 
  conn = DriverManager.getConnection( 
   "jdbc:oracle:thin:@localhost:1521:oracle", "admin", 
   "admin"); 
  threadLocal.set(conn); 
  } catch (ClassNotFoundException e) { 
  e.printStackTrace(); 
  } catch (SQLException e) { 
  e.printStackTrace(); 
  } 
 } 
 return conn; 
 } 
 // 封装设置Connection自动提交 
 public static void setAutoCommit(Connection conn, Boolean flag) { 
 try { 
  conn.setAutoCommit(flag); 
 } catch (SQLException e) { 
  e.printStackTrace(); 
 } 
 } 
 // 设置事务提交 
 public static void commit(Connection conn) { 
 try { 
  conn.commit(); 
 } catch (SQLException e) { 
  e.printStackTrace(); 
 } 
 } 
 // 封装设置Connection回滚 
 public static void rollBack(Connection conn) { 
 try { 
  conn.rollback(); 
 } catch (SQLException e) { 
  e.printStackTrace(); 
 } 
 } 
 // 封装关闭Connection、PreparedStatement、ResultSet的函数 
 public static void closeConnection() { 
 Connection conn = threadLocal.get(); 
 try { 
  if (conn != null) { 
  conn.close(); 
  conn = null; 
  threadLocal.remove(); 
  } 
 } catch (SQLException e) { 
  e.printStackTrace(); 
 } 
 } 
 public static void closePreparedStatement(PreparedStatement pstmt) { 
 try { 
  if (pstmt != null) { 
  pstmt.close(); 
  pstmt = null; 
  } 
 } catch (SQLException e) { 
  e.printStackTrace(); 
 } 
 } 
 public static void closeResultSet(ResultSet rs) { 
 try { 
  if (rs != null) { 
  rs.close(); 
  rs = null; 
  } 
 } catch (SQLException e) { 
  e.printStackTrace(); 
 } 
 } 
}