如：
选择部门的时候，就是查询表部门里面所有的名称；
在这个页面加载的时候就应该出现；

package cn.com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.com.lf.JdbcUtils;

public class All_Part extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	doPost(request, response);
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
    //查询所有部门的名称
		String sql="SELECT DISTINCT part FROM person_info" ;
		ResultSet rs=JdbcUtils.select(sql, null);
		List<String> list=new ArrayList<String>();
		try {
			while(rs.next()){
				list.add(rs.getString(1));
	
			}
			request.setAttribute("alllist", list);
			request.getRequestDispatcher("/SearchPosition.jsp").forward(request, response);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	
}

相关jsp代码

<span class="peo_left">所属机构:
<select>
<option>请选择</option>
 <c:forEach items="${alllist}" var="i"  varStatus="status">
<option>${i}</option>
</c:forEach>
</select>
</span>