导出（下载）数据库查询的数据生成csv文件

@SuppressWarnings({ "unchecked" })
public String downLoadCsvFile(){
System.out.println("下载csv提现对账文件");

HttpServletResponse response1 = ServletActionContext.getResponse();

System.out.println("response1:"+response1);
//从表中查询出数据
String sql = "select t.* from TB_XXX t ";
if(searchTime==null){//如果查询时间为空则默认查询昨天的
//赋默认值
System.out.println("默认查询昨天的");
Calendar cal= Calendar.getInstance();
cal.add(Calendar.DATE, -1);
String yesterday = new SimpleDateFormat( "yyyy-MM-dd").format(cal.getTime());
searchTime=yesterday;
}
log.info("searchTime为："+searchTime);
log.info("accountStatusState为："+accountStatusState);
sql+="where t.settle_date=to_char(to_date('"+searchTime+"','YYYY-MM-DD'),'YYYYMMDD') ";
if(accountStatusState!=null&&!("").equals(accountStatusState)&&accountStatusState!=3){
sql+="and t.diff_flag="+accountStatusState;
}
//		else{
//			accountStatusState = 3;
//			sql+="and t.diff_flag="+accountStatusState;
//		}
//
log.info("查询语句为："+sql);
//		pageBean=accountCheckService.findBySql(sql, pageBean);
/**
* 根据原生sql查询
*/
List<AccountCheck> datalist = accountCheckService.findBySqlToClass(sql);
//		List<AccountCheck> datalist = pageBean.getDataList();
System.out.println("datalist="+datalist);
//		List<String> datalist2 = Arrays.asList(datalist.toString());
//		List refundList = null;
//下载后，跳转到cashMoneyList.jsp
System.out.println("真假："+datalist.toString().equals("[]"));
if(datalist!=null&&!datalist.toString().equals("")&&!datalist.toString().equals("[]")){
List exportData = new ArrayList();
LinkedHashMap datamMap = null;
//			HashMap map = null;
for(int i=0;i<datalist.size();i++){
datamMap = new LinkedHashMap();
datamMap.put("1", datalist.get(i).getOrder_num()!=null?datalist.get(i).getOrder_num():"");
datamMap.put("2", datalist.get(i).getPay_num()!=null?datalist.get(i).getPay_num():"");
datamMap.put("3", datalist.get(i).getOrder_time()!=null?datalist.get(i).getOrder_time():"");
datamMap.put("4", datalist.get(i).getSettle_date()!=null?datalist.get(i).getSettle_date():"");
datamMap.put("5", datalist.get(i).getOrder_money()!=null?datalist.get(i).getOrder_money():"");
datamMap.put("6", datalist.get(i).getPay_money()!=null?datalist.get(i).getPay_money():"");
datamMap.put("7", datalist.get(i).getPay_rate()!=null?datalist.get(i).getPay_rate():"");
if(datalist.get(i).getYt_status()==null){
yt_status="";
}else if(datalist.get(i).getYt_status().equals("0")){
yt_status = "成功";
}else if(datalist.get(i).getYt_status().equals("5")){
yt_status = "退款";
}else{
yt_status = "";
}
datamMap.put("8", yt_status);
if(datalist.get(i).getDiff_flag()==null){
diff_flag="";
}else if(datalist.get(i).getDiff_flag().equals("1")){
diff_flag = "银无我有";
}else if(datalist.get(i).getDiff_flag().equals("2")){
diff_flag = "银有我无";
}else if(datalist.get(i).getDiff_flag().equals("0")){
diff_flag = "平账";
}else{
diff_flag = "";
}
datamMap.put("9", diff_flag);
datamMap.put("10", datalist.get(i).getRefund_date()!=null?datalist.get(i).getRefund_date():"");
if(datalist.get(i).getPay_type()==null){
pay_type="";
}else if(datalist.get(i).getPay_type().equals("1")){
pay_type = "银行卡";
}else if(datalist.get(i).getPay_type().equals("2")){
pay_type = "钱包";
}else{
pay_type = "";
}
datamMap.put("11", pay_type);
if(datalist.get(i).getUser_type()==null){
user_type = "";
}else if(datalist.get(i).getUser_type()==1){
user_type = "发行商";
}else if(datalist.get(i).getUser_type()==2){
user_type = "普通用户";
}else{
user_type = "";
}
datamMap.put("12", user_type);
exportData.add(datamMap);
}
System.out.println("输出到对账表的数据为exportData："+exportData);

//定义导出的文件名
String name = "XX支付对账文件_清算日期_"+searchTime+"_";
try {
fileName = new String(name.getBytes("utf-8"), "ISO8859-1");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
LinkedHashMap map2 = new LinkedHashMap();
map2.put("1", "订单号");
map2.put("2", "支付流水号");
map2.put("3", "订单时间");
map2.put("4", "清算日期");
map2.put("5", "订单金额");
map2.put("6", "支付金额");
map2.put("7", "手续费");
map2.put("8", "XX交易状态"); // 0 成功 5 退款
map2.put("9", "对账结果"); // 1 表示X无我有，2 表示X有我无，0 表示平帐
map2.put("10", "退款时间");
map2.put("11", "支付方式"); //1 银行卡 2 钱包
map2.put("12", "用户类型"); //1 银行卡 2 钱包
//			String filePath= "c:\\Users\\Administrator\\Desktop\\";
//			String filePath="/home/lljrweb/filepath";
String osName = System.getProperty("os.name");
if (osName.contains("Linux")){
filePath=Content.csvfilepath;
}else{
filePath="D:\\apache-tomcat-7.0.53\\csvfilepath";
}
File csvfile = CSVUtil.createCSVFile(exportData, map2, filePath, fileName);//生成CSV文件
try {//将生成的csv文件转换为流
fileInputStream = new FileInputStream(csvfile);
System.out.println("将文件转换成流");
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
fileName = csvfile.getName(); //文件下载名称名
log.info("fileName:"+fileName);
//			String fileName2 = fileName.substring(0,20)+".csv";
//			System.out.println("新的fileName2:"+fileName2);
//			try {
//				log.info("619");
//				CSVUtil.exportFile(response1, filePath + fileName, fileName);
//				msg = "6";
//			} catch (IOException e) {
//				msg = "7";
//				e.printStackTrace();
//			}//下载生成的CSV文件，重定向到列表页面
}else{//返回数据为空
log.info("查询的数据datalist为空");
msg = "7001";//提示改天数据为空
return "toList";

}
System.out.println("返回success");
return "success";
}

package com.lljr.util;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

/**
* 对账管理下载对账文件，生成.csv文件方法
* @author gxy
* @date 2016-3-4下午02:11:10
*/
/**
* 文件操作
*/
public class CSVUtil {
/**
* 生成位csv文件
* @param exportData
* 			源数据List
* @param map
* 			csv文件的列表头map
* @param outPutPath
* 			文件路径
* @param fileName
* 			文件名称
* @return
* @date 2016-3-4下午02:49:33
*/
@SuppressWarnings("unchecked")
public static File createCSVFile(List exportData, LinkedHashMap map, String outPutPath,String fileName){
File csvFile = null;
BufferedWriter csvFileOutputStream = null;
try {
File file = new File(outPutPath);
if (!file.exists()) {
file.mkdir();
}
//定义文件名格式并创建
csvFile = File.createTempFile(fileName, ".csv", new File(outPutPath));
//			//给文件重命名
//			if(csvFile.exists()){
//				System.out.println("传入的fileName是"+fileName);
//				csvFile.renameTo(new File("c:\\Users\\Administrator\\Desktop\\"+fileName+".csv"));
//				System.out.println("csvFile1：" + csvFile);
//			}
//			String ss = "1,2,3,4\r\n";
//
System.out.println("csvFile：" + csvFile);
// UTF-8使正确读取分隔符","
csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "gbk"), 1024);
System.out.println("csvFileOutputStream：" + csvFileOutputStream);
// 写入文件头部
for(Iterator propertyIterator = map.entrySet().iterator(); propertyIterator.hasNext();){

java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();
csvFileOutputStream.write("" + (String) propertyEntry.getValue() != null ? (String) propertyEntry.getValue() : "" + "");
if(propertyIterator.hasNext()) {
csvFileOutputStream.write(",");
}
}
csvFileOutputStream.newLine();
// 写入文件内容
for (Iterator iterator = exportData.iterator(); iterator.hasNext();) {
Object row = (Object) iterator.next();
for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator.hasNext();){
java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();
csvFileOutputStream.write((String) BeanUtils.getProperty(row,(String) propertyEntry.getKey()));
if (propertyIterator.hasNext()) {
csvFileOutputStream.write(",");
}
}
if(iterator.hasNext()){
csvFileOutputStream.newLine();
}
}
csvFileOutputStream.flush();
} catch (Exception e) {
e.printStackTrace();
} finally{
try {
csvFileOutputStream.close();
} catch (Exception e2) {
e2.printStackTrace();
}
}
return csvFile;
}

/**
*     下载文件
* @param response
* @param csvFilePath
* 			文件路径
* @param fileName
* 			文件名称
* @throws IOException
* @date 2016-3-4下午03:10:13
*/
public static void exportFile(HttpServletResponse response, String csvFilePath, String fileName)
throws IOException {
response.setContentType("application/csv;charset=UTF-8");
response.setHeader("Content-Disposition","attachment; filename=" + URLEncoder.encode(fileName, "UTF-8"));
InputStream in = null;
OutputStream out = null;
try {
in = new FileInputStream(csvFilePath);
int len = 0;
byte[] buffer = new byte[1024];
response.setCharacterEncoding("UTF-8");
out = response.getOutputStream();
while ((len = in.read(buffer)) > 0) {
out.write(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF });
out.write(buffer, 0, len);
}
} catch (FileNotFoundException e) {
System.out.println(e);
} finally{
if(in != null||out!=null){
try {
out.close();//解决冲突问题
in.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}

/**
* 删除该目录filePath下的所有文件
* @param filePath
*       文件目录路径
*/
public static void deleteFiles(String filePath) {
File file = new File(filePath);
if (file.exists()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
files[i].delete();
}
}
}
}

/**
* 删除单个文件
* @param filePath
* 文件目录路径
* @param fileName
* 文件名称
*
*/
public static void deleteFile(String filePath, String fileName) {
File file = new File(filePath);
if (file.exists()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
if (files[i].getName().equals(fileName)) {
files[i].delete();
return;
}
}
}
}
}

/**
* 测试数据
* @param args
* @date 2016-3-4下午03:06:03
*/
@SuppressWarnings("unchecked")
public static void main(String[] args) {
List exportData = new ArrayList<Map>();
Map row1 = new LinkedHashMap<String, String>();
row1.put("1", "11");
row1.put("2", "12");
row1.put("3", "13");
row1.put("4", "14");
exportData.add(row1);
row1 = new LinkedHashMap<String, String>();
row1.put("1", "21");
row1.put("2", "22");
row1.put("3", "23");
row1.put("4", "24");
exportData.add(row1);
LinkedHashMap map = new LinkedHashMap();
map.put("1", "第一列");
map.put("2", "第二列");
map.put("3", "第三列");
map.put("4", "第四列");
String path = "c:/export/";
String fileName = "文件导出";
File file = CSVUtil.createCSVFile(exportData, map, path, fileName);
String fileName2 = file.getName();
System.out.println("文件名称：" + fileName2);
}
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
<package name="XXXXcheckAction" namespace="/admin/XXXXcheck" extends="global">
<action name="*" class="XXXXCheckAction" method="{1}">

<result name="list">list.jsp</result>
<result name="redBack" type="redirect"></result>
<result name="refund" type="redirect"></result>
<result name="lanbu" type="redirect"></result>
<result name="toList" type="redirect"></result>
<!-- 文件下载  -->
<result type="stream" name="success">
<!-- 文件对应的流对象，与action中流对象名保持一致 -->
<param name="inputName">fileInputStream</param>
<!-- 文件类型，application/octet-stream是不限制类型 -->
<param name="contentType">application/octet-stream</param>
<!-- 发送给客户端的文件名，${fileName} 与action中文件名保持一致-->
<param name="contentDisposition">attachment;filename="${fileName}"</param>
<!-- 缓冲区大小 -->
<param name="bufferSize">2048</param>
</result>
</action>
</package>
</struts>