從資料庫提取資料通過jstl顯示在jsp頁面上

最後更新：2016-10-09 來源：互聯網

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1.ConnectDB.java串連資料庫，把資料轉換成list

public class ConnectDB {
private final static String strDriver = "oracle.jdbc.driver.OracleDriver";
private final static String strConnect = "jdbc:oracle:thin:@localhost:1521:ORCL";
private final static String strDBUserName = "scott";
private final static String strDBPWD = "tiger";
private Connection conn = null;
private Statement stat = null;
private ResultSet rs = null;

//串連oracle資料庫
private void getConnectFromOracle() throws ClassNotFoundException,
   SQLException {
  Class.forName(strDriver);// 執行個體化oracle.jdbc.driver.OracleDriver
  conn = DriverManager.getConnection(strConnect, strDBUserName, strDBPWD);
  stat = conn.createStatement();
}

//記錄基每行資料存放到值對象，然後把值對象存放一個鏈表
public List<EMPVO> getListWithVOFromRS() {
  String sql = "select * from emp";
  List<EMPVO> rowList = new LinkedList<EMPVO>();
  EMPVO emp = null;
  try {
   getConnectFromOracle();
   rs = stat.executeQuery(sql);
   while (rs.next()) {
    emp = new EMPVO();
    // 為了簡單僅取2個值
    emp.setEname(rs.getString("ename"));
    emp.setHiredate(rs.getString("hiredate"));
    rowList.add(emp);
   }
   closeConnection();
  } catch (ClassNotFoundException e) {
  } catch (SQLException e) {
  }
  return rowList;
}

//記錄基每行資料存放到1個鏈表，然後把這個鏈表存放另一個鏈表
public List<List<String>> getListWithListFromRS() {
  String sql = "select * from emp";
  List<List<String>> rowList = new LinkedList<List<String>>();
  List<String> colList = null;
  try {
   getConnectFromOracle();
   rs = stat.executeQuery(sql);
   int columnCount = rs.getMetaData().getColumnCount();
   while (rs.next()) {
    colList = new LinkedList<String>();
    for (int i = 1; i <= columnCount; i++) {
     colList.add(rs.getString(i));
    }
    rowList.add(colList);
   }
   closeConnection();
  } catch (ClassNotFoundException e) {
  } catch (SQLException e) {
  }
  return rowList;
}

//關閉資料庫
public void closeConnection() throws SQLException {
  if (rs != null)
   rs.close();
  if (stat != null)
   stat.close();
  if (conn != null)
   conn.close();
}
}
2.EMPVO.java emp表的值對象

public class EMPVO {
private String empno;
private String ename;
private String job;
private String mgr;
private String hiredate;
private String sal;
private String comm;
private String deptno;

public String getComm() {
return comm;
}

public void setComm(String comm) {
this.comm = comm;
}

public String getDeptno() {
return deptno;
}

public void setDeptno(String deptno) {
this.deptno = deptno;
}

public String getEmpno() {
return empno;
}

public void setEmpno(String empno) {
this.empno = empno;
}

public String getEname() {
return ename;
}

public void setEname(String ename) {
this.ename = ename;
}

public String getHiredate() {
return hiredate;
}

public void setHiredate(String hiredate) {
this.hiredate = hiredate;
}

public String getJob() {
return job;
}

public void setJob(String job) {
this.job = job;
}

public String getMgr() {
return mgr;
}

public void setMgr(String mgr) {
this.mgr = mgr;
}

public String getSal() {
return sal;
}

public void setSal(String sal) {
this.sal = sal;
}
}

3.JstlServlet 調用ConnectDB，把List放入request對象，跳轉到jstl.jsp

public class JstlServlet extends HttpServlet {

private static final long serialVersionUID = 7129164252442979467L;

public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  ConnectDB db = new ConnectDB();
  request.setAttribute("listinlist", db.getListWithListFromRS());
  request.setAttribute("voinlist", db.getListWithVOFromRS());
  request.getRequestDispatcher("jstl.jsp").forward(request, response);
}

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

4.jstl.jsp

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <body>
   <table>
    <tr><h1>listinlist</h1></tr>
    <c:forEach items="${listinlist}" var="rowlist">
     <tr>
     <c:forEach items="${rowlist}" var="collist">
      <td>${collist}</td>
     </c:forEach>
     </tr>
    </c:forEach>
   </table>
   <table>
    <tr><h1>voinlist</h1></tr>
    <c:forEach items="${voinlist}" var="empvo">
     <tr>
      <td>${empvo.ename}</td><td>${empvo.hiredate}</td>
     </tr>
    </c:forEach>
   </table>
  </body>
</html>

從資料庫提取資料通過jstl顯示在jsp頁面上

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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