首先jsp头部要引个东西，上次因为没引，找了好半天的错误
<%@ taglib uri="/tags/c" prefix="c" %>
还有有
<%@ page language="java" pageEncoding="gbk" import="java.util.List,struts.form.KK_BlacklistVehicle_UserEnrolForm"%>
jsp里写的
<%
List listCode=bean.KK_BlacklistVehicle_UserEnrolSQLBean.getInstance().diffListCode();//从后台把值取出并放在list里
request.setAttribute("listCode", listCode);
%>
<%
//这个是测试这个list在后台有没有取到值
//for(int i = 0; i < listCode.size(); i++) {
//KK_BlacklistVehicle_UserEnrolForm bean = (KK_BlacklistVehicle_UserEnrolForm)listCode.get(i);
//System.out.println("页面上输出的：======="+bean.getKk_BlacklistVehicle_UserEnrol_DW());
//}
%>
<c:if test="${empty listCode}">//这个判断listCode的值有没有传到页面上来，没有的话会在页面上输出not get list value
<%out.print("not get list value"); %>
</c:if>
<html:select property="kk_BlacklistVehicle_UserEnrol_DW" >
<html:option value="">--请选择单位--</html:option>
<c:forEach var="listCode" items="${listCode}">//这句是遍历这个listCode，遍历一次取一次值，赋给 var="listCode"
<html:option value="${listCode.kk_BlacklistVehicle_UserEnrol_DW}">${listCode.kk_BlacklistVehicle_UserEnrol_DW}</html:option>//显示出来遍历后的值
</c:forEach>
</html:select>KK_BlacklistVehicle_UserEnrolSQLBean
public class KK_BlacklistVehicle_UserEnrolSQLBean
{
// 声明一个数据库操作对象
PreparedStatement pstmt = null ;
// 声明一个结果集对象
ResultSet rs = null ;
// DataBaseConnection为具体的数据库连接及关闭操作类,连接数据库
DataBaseConnection dbc = new DataBaseConnection() ;
//数据库对象
Statement sta = null ;
private static KK_BlacklistVehicle_UserEnrolSQLBean instance;
public synchronized static KK_BlacklistVehicle_UserEnrolSQLBean getInstance()
{
if(instance==null)
{
instance=new KK_BlacklistVehicle_UserEnrolSQLBean();
}
return instance;
}
public List diffListCode( )
{
DataBaseConnection dbc=new DataBaseConnection();
Connection conn=dbc.getConnection();
PreparedStatement pst = null;
List<KK_BlacklistVehicle_UserEnrolForm> list=new ArrayList<KK_BlacklistVehicle_UserEnrolForm>();
String sql="select distinct dw from kk.KKYH ";
try {
pst = conn.prepareStatement(sql);
ResultSet rs=pst.executeQuery();
while(rs.next())
{
KK_BlacklistVehicle_UserEnrolForm userEnrolForm=new KK_BlacklistVehicle_UserEnrolForm();
userEnrolForm.setKk_BlacklistVehicle_UserEnrol_DW(rs.getString(1));
list.add(userEnrolForm);
}
}catch (SQLException e) {
e.printStackTrace();
}finally{
try {
if(pst!=null)
{
pst.close();
}if(conn!=null)
{
conn.close();
}
} catch (Exception e) {
}
}
return list;
}
}
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