Database 用数据库中的值填充jsp下拉菜单
如何用数据库中的值填充JSP中的下拉菜单(遵循MVC体系结构)? 我试过这么做 在…内 EmployeeDAO.javaDatabase 用数据库中的值填充jsp下拉菜单,database,jsp,servlets,Database,Jsp,Servlets,如何用数据库中的值填充JSP中的下拉菜单(遵循MVC体系结构)? 我试过这么做 在…内 EmployeeDAO.java private List<EmployeeVO> empIDList; public List<EmployeeVO> getStateList(){ empIDList=new ArrayList<EmployeeVO>(); Connection con=DBUtil.getConnection
private List<EmployeeVO> empIDList;
public List<EmployeeVO> getStateList(){
empIDList=new ArrayList<EmployeeVO>();
Connection con=DBUtil.getConnection();
try {
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select Emp_id from Employee order by Emp_id ASC");
while(rs.next()){
String emID=rs.getString("Emp_id");
int empID=Integer.parseInt(emID);
EmployeeVO s=new EmployeeVO();
s.setEmp_id(empID);
empIDList.add(s);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return empIDList;
}
里面
Employee.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<jsp:useBean id="emplID" scope="session" class="com.model.EmployeeVO" />
<th>Employee ID</th>
<td><input type="text" name="EID" id="eid" />
<select
id="testlist">
<c:forEach var="item" items="${emplID.items}">
<option>${item}</option>
</c:forEach>
</select>
</td>
员工ID
${item}
jsp的源代码取自第页,或许您可以尝试此
Vector
或arraylist
方法
jsp部分(矢量)
html部分
---请选择---
请尝试引用此问题,谢谢您的帮助。因为在JSP中使用Scriptlet会影响性能。我们如何使用MVC实现这一点?
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<jsp:useBean id="emplID" scope="session" class="com.model.EmployeeVO" />
<th>Employee ID</th>
<td><input type="text" name="EID" id="eid" />
<select
id="testlist">
<c:forEach var="item" items="${emplID.items}">
<option>${item}</option>
</c:forEach>
</select>
</td>
<%
Vector vFRUIT_CODE = new Vector();
Vector vFRUIT_DESCP = new Vector();
String SQL = "SELECT * FROM TB_TEST";
DB_TEST.makeConnection();
DB_TEST.executeQuery(SQL);
while(DB_TEST.getNextQuery())
{
String sCODE = DB_TEST.getColumnString("FRUIT_CODE");
String sDESCP = DB_TEST.getColumnString("FRUIT_DESCP");
vFRUIT_CODE.addElement(sCODE);
vFRUIT_DESCP.addElement(sDESCP);
}
DB_TEST.takeDown();
%>
<select name="FRUIT">
<option value="">--- Please Select ---</option>
<%
for (int i=0;i<vFRUIT_CODE.size();i++) {
String sCODE = (String) vFRUIT_CODE.elementAt(i);
String sDESCP = (String) vFRUIT_DESCP.elementAt(i);
%>
<option value="<%=sCODE %>" ><%= sDESCP %></option>
<%}%>
</select>