本篇内容主要讲解“Java怎么从服务端下载Excel模板文件”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Java怎么从服务端下载Excel模板文件”吧!
方法一
生成excel模板
@RequestMapping("/downloadExcel")
public void downloadExcel(HttpServletResponse response, HttpServletRequest request) {
String [] excelHeader = {"姓名","手机号（必填）","渠道名","产品名","手机操作系统（IOS/安卓)","是否是XX数据"};
List<Object> list = new ArrayList<>();
Object[] obj1 = {"张三","173*****311","a1","A","IOS","是"};
Object[] obj2 = {"李四","138*****742","a2","B","安卓","否"};
list.add(obj1);
list.add(obj2);
FileExport.exportExcel(excelHeader, list, "XXX模板", response, request);
}FileExport工具类：
package com.abc.common.utils.file;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
* 文件导出工具
* @author abc
* @date 2019/01/08
*/
public class FileExport {
private static final Logger logger = LoggerFactory.getLogger(FileExport.class);
/** CSV文件列分隔符 */
private static final String CSV_COLUMN_SEPARATOR = ",";
private static final String CSV_COLUM_TABLE = "\t";
/** CSV文件列分隔符 */
private static final String CSV_RN = "\r\n";
/**
* 导出Excel文件
*
* @param excelHeader
* 导出文件中表格头
* @param list
* 导出的内容
* @param response
* HttpServletResponse对象，用来获得输出流向客户端写导出的文件
* @param sheetName
* Excel的sheet名称，加上时间戳作为导出文件的名称
*/
public static void exportExcel(String [] excelHeader, List<Object> list, String sheetName, HttpServletResponse response, HttpServletRequest request) {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet(sheetName);
HSSFRow row = sheet.createRow((int) 0);
/******设置单元格是否显示网格线******/
sheet.setDisplayGridlines(false);
/******设置头单元格样式******/
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HorizontalAlignment.CENTER);
Font fontHeader = wb.createFont();
fontHeader.setBold(true);
fontHeader.setFontHeight((short) 240);
style.setFont(fontHeader);
style.setBorderBottom(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
/******设置头内容******/
for (int i = 0; i < excelHeader.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellValue(" " +excelHeader[i] + " ");
cell.setCellStyle(style);
}
/******设置内容单元格样式******/
HSSFCellStyle styleCell = wb.createCellStyle();
Font fontCell = wb.createFont();
fontCell.setColor(HSSFColor.BLACK.index);
styleCell.setAlignment(HorizontalAlignment.CENTER);
styleCell.setFont(fontCell);
styleCell.setBorderBottom(BorderStyle.THIN);
styleCell.setBorderLeft(BorderStyle.THIN);
styleCell.setBorderRight(BorderStyle.THIN);
styleCell.setBorderTop(BorderStyle.THIN);
/******设置单元格内容******/
for (int i = 0; i < list.size(); i++) {
row = sheet.createRow(i + 1);
/******设置行高******/
row.setHeightInPoints(20);
Object[] obj = (Object[]) list.get(i);
for (int j = 0; j < excelHeader.length; j++) {
styleCell.setWrapText(false);
HSSFCell cell = row.createCell(j);
if (obj[j] != null){
cell.setCellValue(obj[j].toString());
}else{
cell.setCellValue("");
}
//if(obj[j].toString().length()>20)
// styleCell.setWrapText(true);
cell.setCellStyle(styleCell);
sheet.autoSizeColumn(j);
}
}
OutputStream ouputStream = null;
try {
String encoding = "UTF-8";
/** 获取浏览器相关的信息 */
String userAgent = request.getHeader("user-agent");
/** 判断是否为msie浏览器 */
if (userAgent.toLowerCase().indexOf("msie") != -1){
encoding = "gbk";
}
response.setCharacterEncoding(encoding);
response.setContentType("application/vnd.ms-excel");
String fileName = sheetName;
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHMMSS");
fileName += (dateFormat.format(new Date())).toString()+".xls";
response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, encoding));
ouputStream = response.getOutputStream();
wb.write(ouputStream);
ouputStream.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if(ouputStream!=null) {
ouputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 导出CSV文件
* @param dataList 集合数据
* @param colNames 表头部数据
* @param mapKey 查找的对应数据
*/
public static boolean doExport(List<Map<String, Object>> dataList, String colNames, String mapKey, OutputStream os) {
try {
StringBuffer buf = new StringBuffer();
String[] colNamesArr = null;
String[] mapKeyArr = null;
colNamesArr = colNames.split(",");
mapKeyArr = mapKey.split(",");
/******完成数据csv文件的封装******/
/******输出列头******/
for (int i = 0; i < colNamesArr.length; i++) {
buf.append(colNamesArr[i]).append(CSV_COLUMN_SEPARATOR);
}
buf.append(CSV_RN);
if (null != dataList) {
/******输出数据******/
for (int i = 0; i < dataList.size(); i++) {
for (int j = 0; j < mapKeyArr.length; j++) {
buf.append(dataList.get(i).get(mapKeyArr[j])).append(CSV_COLUM_TABLE).append(CSV_COLUMN_SEPARATOR);
}
buf.append(CSV_RN);
}
}
/******写出响应******/
os.write(buf.toString().getBytes("GBK"));
os.flush();
return true;
} catch (Exception e) {
logger.error("doExport错误...", e);
}
return false;
}
/**
* 设置响应格式
* @param fileName
* @param response
* @throws UnsupportedEncodingException
*/
public static void responseSetProperties(String fileName, HttpServletResponse response) throws UnsupportedEncodingException {
/******设置文件后缀******/
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
String fn = fileName + sdf.format(new Date()).toString() + ".csv";
/******读取字符编码******/
String utf = "UTF-8";
/******设置响应******/
response.setContentType("application/ms-txt.numberformat:@");
response.setCharacterEncoding(utf);
response.setHeader("Pragma", "public");
response.setHeader("Cache-Control", "max-age=30");
response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fn, utf));
}
}导出CSV文件
@GetMapping("/exportFailureRecord")
public void exportFailureRecord(String batchNumber, HttpServletResponse response) {
if (StringUtils.isBlank(batchNumber)) {
log.warn("失败记录导出失败，批次号为空...");
return;
}
//这里根据你的业务查询出数据
List<ImportFailureRecord> list = importFailureRecordService.selectList(new EntityWrapper<ImportFailureRecord>()
.eq("is_delete", 0)
.eq("batch_number", batchNumber));
if (CollectionUtil.isEmpty(list)) {
log.warn("未查询到可导出的数据...");
return;
}
log.info("===========查询到{}条可导出数据==============", list.size());
String sTitle = "用户姓名,手机号,失败原因";
String fName = "xxx失败记录数据_";
String mapKey = "userName,userPhone,failureReason";
List<Map<String, Object>> dataList = new ArrayList<>();
for (ImportFailureRecord data : list) {
Map<String, Object> map = new HashMap<>();
map.put("userName", data.getUserName() == null ? "" : data.getUserName());
map.put("userPhone", data.getUserPhone() == null ? "" : data.getUserPhone());
map.put("failureReason", data.getFailureReason() == null ? "" : data.getFailureReason());
dataList.add(map);
}
try (final OutputStream os = response.getOutputStream()) {
log.info("=============失败记录导出开始============");
FileExport.responseSetProperties(fName, response);
FileExport.doExport(dataList, sTitle, mapKey, os);
log.info("=============失败记录导出结束============");
} catch (Exception e) {
log.error("导出失败记录数据失败", e);
}
}方法二
/**
* 描述：下载外部案件导入模板
* @param response
* @param request
* @author songfayuan
* 2018年6月7日下午5:03:59
*/
@RequestMapping("/downloadExcel")
@ResponseBody
public void downloadExcel(HttpServletResponse response,HttpServletRequest request) {
//方法一：直接下载路径下的文件模板（这种方式貌似在SpringCloud和Springboot中，打包成JAR包时，无法读取到指定路径下面的文件，不知道记错没，你们可以自己尝试下！！！）
try {
//获取要下载的模板名称
String fileName = "ApplicationImportTemplate.xlsx";
//设置要下载的文件的名称
response.setHeader("Content-disposition", "attachment;fileName=" + fileName);
//通知客服文件的MIME类型
response.setContentType("application/vnd.ms-excel;charset=UTF-8");
//获取文件的路径
String filePath = getClass().getResource("/template/" + fileName).getPath();
FileInputStream input = new FileInputStream(filePath);
OutputStream out = response.getOutputStream();
byte[] b = new byte[2048];
int len;
while ((len = input.read(b)) != -1) {
out.write(b, 0, len);
}
//修正 Excel在“xxx.xlsx”中发现不可读取的内容。是否恢复此工作薄的内容？如果信任此工作簿的来源，请点击"是"
response.setHeader("Content-Length", String.valueOf(input.getChannel().size()));
input.close();
//return Response.ok("应用导入模板下载完成");
} catch (Exception ex) {
logger.error("getApplicationTemplate :", ex);
//return Response.ok("应用导入模板下载失败！");
}
//方法二：可以采用POI导出excel，但是比较麻烦（这里类似方法一）
/*try {
Workbook workbook = new HSSFWorkbook();
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("application/x-download");
String filedisplay = "导入模板.xls";
filedisplay = URLEncoder.encode(filedisplay, "UTF-8");
response.addHeader("Content-Disposition", "attachment;filename="+ filedisplay);
// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
Sheet sheet = workbook.createSheet("导入模板");
// 第三步，在sheet中添加表头第0行
Row row = sheet.createRow(0);
// 第四步，创建单元格，并设置值表头 设置表头居中
CellStyle style = workbook.createCellStyle();
style.setAlignment(CellStyle.ALIGN_CENTER); // 创建一个居中格式
Cell cell = row.createCell(0);
cell.setCellValue("商品名称");
cell.setCellStyle(style);
sheet.setColumnWidth(0, (25 * 256)); //设置列宽，50个字符宽
cell = row.createCell(1);
cell.setCellValue("商品编码");
cell.setCellStyle(style);
sheet.setColumnWidth(1, (20 * 256)); //设置列宽，50个字符宽
cell = row.createCell(2);
cell.setCellValue("商品价格");
cell.setCellStyle(style);
sheet.setColumnWidth(2, (15 * 256)); //设置列宽，50个字符宽
cell = row.createCell(3);
cell.setCellValue("商品规格");
cell.setCellStyle(style);
sheet.setColumnWidth(3, (15 * 256)); //设置列宽，50个字符宽
// 第五步，写入实体数据 实际应用中这些数据从数据库得到
row = sheet.createRow(1);
row.createCell(0, Cell.CELL_TYPE_STRING).setCellValue(1);
row.createCell(1, Cell.CELL_TYPE_STRING).setCellValue(2);
row.createCell(2, Cell.CELL_TYPE_STRING).setCellValue(3); //商品价格
row.createCell(3, Cell.CELL_TYPE_STRING).setCellValue(4); //规格
// 第六步，将文件存到指定位置
try
{
OutputStream out = response.getOutputStream();
workbook.write(out);
out.close();
}
catch (Exception e)
{
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}*/
}模板位置：
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