使用Jsp/Js/Ajax/Json/Jquery/Easyui + Servlet + JDBC + Lucene/Mysql/Oracle完成資料庫分頁
阿新 • • 發佈：2018-12-04
package loaderman.action; import java.io.IOException; import java.io.PrintWriter; import java.util.LinkedHashMap; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import loaderman.entity.Page; import loaderman.service.impl.EmpService; import loaderman.service.inter.IEmpService; import net.sf.json.JSONArray; /** * 員工管理模組 * 控制器 */ public class EmpServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException { this.doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { try { //設定編號方式 request.setCharacterEncoding("UTF-8");//獲取客戶端傳入的引數 String strPage = request.getParameter("page");//rows if(strPage == null || strPage.trim().length()==0){ strPage = "1"; } Integer currPageNO = Integer.parseInt(strPage); //呼叫業務層 IEmpService iEmpService = new EmpService(); Page page = iEmpService.show(currPageNO); //建立Map集合 Map<String,Object> map = new LinkedHashMap<String,Object>(); map.put("total",page.getAllRecordNO()); map.put("rows",page.getEmpList()); //使用第三方工具將map轉成json文字 JSONArray jsonArray = JSONArray.fromObject(map); String jsonJAVA = jsonArray.toString(); //去掉二邊的空格 jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length()-1); System.out.println("jsonJAVA=" + jsonJAVA); //以字元流的方式，將json字串輸出到客戶端 response.setContentType("text/html;charset=UTF-8"); PrintWriter pw = response.getWriter(); pw.write(jsonJAVA); pw.flush(); pw.close(); }catch (Exception e) { e.printStackTrace(); } } }
package loaderman.dao.impl; import java.math.BigDecimal; import java.util.List; import loaderman.dao.inter.IEmpDao; import loaderman.entity.Emp; import loaderman.util.JdbcUtil; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanListHandler; import org.apache.commons.dbutils.handlers.ScalarHandler; /** * 員工管理模組 * 持久層實現 */ public class EmpDao implements IEmpDao{ public Integer getAllRecord() throws Exception { QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource()); String sql = "SELECT COUNT(EMPNO) FROM EMP"; BigDecimal bigDecimal = (BigDecimal) runner.query(sql,new ScalarHandler()); return bigDecimal.intValue(); } public List<Emp> findAllRecord(int start, int end) throws Exception { QueryRunner runner = new QueryRunner(JdbcUtil.getDataSource()); String sql = " SELECT XX.EMPNO,XX.ENAME,XX.JOB,XX.MGR,XX.HIREDATE,XX.SAL,XX.COMM,XX.DEPTNO" + " FROM (SELECT ROWNUM ID,EMP.* FROM EMP WHERE ROWNUM<?) XX" + " WHERE ID>?"; Object[] params = {end,start}; return runner.query(sql,new BeanListHandler<Emp>(Emp.class),params); } public static void main(String[] args) throws Exception{ EmpDao dao = new EmpDao(); System.out.println("共有" + dao.getAllRecord() + "個員工"); System.out.println("------------------------------------------------第1頁"); for(Emp e : dao.findAllRecord(0,4)){ System.out.println(e); } System.out.println("------------------------------------------------第2頁"); for(Emp e : dao.findAllRecord(3,7)){ System.out.println(e); } System.out.println("------------------------------------------------第3頁"); for(Emp e : dao.findAllRecord(6,10)){ System.out.println(e); } System.out.println("------------------------------------------------第4頁"); for(Emp e : dao.findAllRecord(9,13)){ System.out.println(e); } System.out.println("------------------------------------------------第5頁"); for(Emp e : dao.findAllRecord(12,16)){ System.out.println(e); } } }
package loaderman.dao.inter; import loaderman.entity.Emp; import java.util.List; /** * 員工管理模組 * 持久層介面 */ public interface IEmpDao { /** * 獲取總記錄數 * @return 總記錄數 */ public Integer getAllRecord() throws Exception; /** * 分批查詢所有記錄 * @param start 表示 從第幾條記錄開始 * @param end 表示 到第幾條記錄結束 * @return 表示 start到end之間的記錄集合，包含start和end */ public List<Emp> findAllRecord(int start,int end) throws Exception; }
package loaderman.entity; import java.util.Date; /** * 員工 */ public class Emp { private Integer empno;//編號 private String ename;//姓名 private String job;//工作 private Integer mgr;//上級編號 private Date hiredate;//入職時間 private Integer sal;//月薪 private Integer comm;//佣金 private Integer deptno;//部門編號 public Emp(){} public Integer getEmpno() { return empno; } public void setEmpno(Integer empno) { this.empno = empno; } public String getEname() { return ename; } public void setEname(String ename) { this.ename = ename; } public String getJob() { return job; } public void setJob(String job) { this.job = job; } public Integer getMgr() { return mgr; } public void setMgr(Integer mgr) { this.mgr = mgr; } public Date getHiredate() { return hiredate; } public void setHiredate(Date hiredate) { this.hiredate = hiredate; } public Integer getSal() { return sal; } public void setSal(Integer sal) { this.sal = sal; } public Integer getComm() { return comm; } public void setComm(Integer comm) { this.comm = comm; } public Integer getDeptno() { return deptno; } public void setDeptno(Integer deptno) { this.deptno = deptno; } @Override public String toString() { return this.empno+":"+this.ename+":"+this.sal+":"+this.hiredate+":"+this.deptno; } }
package loaderman.entity; import java.util.ArrayList; import java.util.List; /** * 分頁類 * @author AdminTC */ public class Page { private Integer currPageNO;//當前頁號OK private Integer perPageSize = 9;//每頁顯示記錄數，預設為3條記錄OK private Integer allRecordNO;//總記錄數OK private Integer allPageNO;//總頁號OK private List<Emp> empList = new ArrayList<Emp>();//該本頁顯示的內容OK public Page(){} public Integer getCurrPageNO() { return currPageNO; } public void setCurrPageNO(Integer currPageNO) { this.currPageNO = currPageNO; } public Integer getPerPageSize() { return perPageSize; } public void setPerPageSize(Integer perPageSize) { this.perPageSize = perPageSize; } public Integer getAllRecordNO() { return allRecordNO; } public void setAllRecordNO(Integer allRecordNO) { this.allRecordNO = allRecordNO; } public Integer getAllPageNO() { return allPageNO; } public void setAllPageNO(Integer allPageNO) { this.allPageNO = allPageNO; } public List<Emp> getEmpList() { return empList; } public void setEmpList(List<Emp> empList) { this.empList = empList; } }
package loaderman.service.impl; import loaderman.dao.impl.EmpDao; import loaderman.dao.inter.IEmpDao; import loaderman.entity.Emp; import loaderman.entity.Page; import loaderman.service.inter.IEmpService; import java.util.List; /** * 員工管理模組 * 業務層實現 */ public class EmpService implements IEmpService{ private IEmpDao iEmpDao = new EmpDao(); public Page show(int currPageNO) throws Exception { Page page = new Page(); //封裝當前頁號 page.setCurrPageNO(currPageNO); //封裝總記錄數 Integer allRecordNO = iEmpDao.getAllRecord(); page.setAllRecordNO(allRecordNO); //封裝總頁數 Integer allPageNO = null; if(page.getAllRecordNO() % page.getPerPageSize() == 0){ allPageNO = page.getAllRecordNO() / page.getPerPageSize(); }else{ allPageNO = page.getAllRecordNO() / page.getPerPageSize() + 1; } page.setAllPageNO(allPageNO); //封裝該本顯示的內容 Integer start = (page.getCurrPageNO()-1) * page.getPerPageSize(); Integer end = page.getCurrPageNO() * page.getPerPageSize() + 1; List<Emp> empList = iEmpDao.findAllRecord(start,end); page.setEmpList(empList); return page; } public static void main(String[] args) throws Exception{ EmpService service = new EmpService(); System.out.println("---------------------------------------NO1"); Page page = service.show(1); for(Emp e : page.getEmpList()){ System.out.println(e); } System.out.println("---------------------------------------NO2"); page = service.show(2); for(Emp e : page.getEmpList()){ System.out.println(e); } System.out.println("---------------------------------------NO3"); page = service.show(3); for(Emp e : page.getEmpList()){ System.out.println(e); } System.out.println("---------------------------------------NO4"); page = service.show(4); for(Emp e : page.getEmpList()){ System.out.println(e); } System.out.println("---------------------------------------NO5"); page = service.show(5); for(Emp e : page.getEmpList()){ System.out.println(e); } } }
package loaderman.service.inter; import loaderman.entity.Page; /** * 員工管理模組 * 業務層介面 */ public interface IEmpService { /** * 根據頁號獲取該頁需要顯示的內容 * @param currPageNO 當前頁號 * @return 封裝該頁需要顯示的內容 */ public Page show(int currPageNO) throws Exception; }
package loaderman.util; import com.mchange.v2.c3p0.ComboPooledDataSource; /** * 工具類 */ public class JdbcUtil { /** * 載入src目錄下的c3p0-config.xml檔案 */ private static ComboPooledDataSource dataSource = new ComboPooledDataSource(); /** * 獲取資料來源 * @return 資料來源 */ public static ComboPooledDataSource getDataSource() { return dataSource; } }
<?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <default-config> <property name="driverClass">oracle.jdbc.driver.OracleDriver</property> <property name="jdbcUrl">jdbc:oracle:thin:@127.0.0.1:1521:orcl</property> <property name="user">scott</property> <property name="password">tiger</property> <property name="initialPoolSize">5</property> <property name="maxPoolSize">5</property> <property name="minPoolSize">1</property> <property name="acquireIncrement">2</property> </default-config> </c3p0-config>
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>EmpServlet</servlet-name> <servlet-class>loaderman.action.EmpServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>EmpServlet</servlet-name> <url-pattern>/EmpServlet</url-pattern> </servlet-mapping> </web-app>