将数据导出为csv文件（需要javacsv.jar）

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

public class Export extends HttpServlet {
	private static final long serialVersionUID = 1L;
   
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("application/csv;charset=gbk");
		response.setHeader("Content-Disposition","attachment; filename=test.csv");
		PrintWriter out = response.getWriter();
		
		out.write("\"FirstName\","); 
		out.write("\"LastName\",");
		out.write("\"Age\",");
		out.write("\"Province\"\n"); 
		
		out.close();
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

}