SXSSFWorkbook实现百万级数据excel生成,只需要7分钟,话不多说,直接贴代码
本测试采用的技术是springboot,java,maven,SXSSFWorkbook
maven配置:
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.2.1.RELEASE
com.example
demo
0.0.1-SNAPSHOT
demo
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter
com.alibaba
easyexcel
2.1.2
org.springframework.boot
spring-boot-starter-test
test
org.junit.vintage
junit-vintage-engine
commons-codec
commons-codec
org.apache.commons
commons-lang3
3.1
commons-lang
commons-lang
2.6
commons-beanutils
commons-beanutils
org.apache.tomcat.embed
tomcat-embed-jasper
provided
javax.servlet
javax.servlet-api
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-tomcat
javax.servlet
jstl
junit
junit
4.12
compile
org.springframework.boot
spring-boot-maven-plugin
2.application.properties
server.port=8081
r.excel.size=10003.入口类
@RequestMapping("/excel/export")
public void export(HttpServletResponse response) throws Exception {
logger.info("开始导出：" + DateUtil.formatDate(new Date(), DateUtil.YYYY_MM_DD_HH_MM_SS));
String fileName= ExcelUtil.exportExcel(getData(),getNameList());
download(fileName,response);
logger.info("结束导出：" + DateUtil.formatDate(new Date(), DateUtil.YYYY_MM_DD_HH_MM_SS));
}4.定义表头
//获取表名
public String[] getNameList(){
String[] titles = {"账号", "密码", "状态", "昵称", "职位", "手机号", "邮箱", "创建人ID", "创建时间", "修改人ID", "修改时间"};
return titles;
}5.获取数据
//获取数据
public List> getData(){
List> maps=new ArrayList<>();
for (int i = 0; i <10 ; i++) {
Map map=new HashMap();
map.put("账号",i);
map.put("密码",i);
map.put("状态",i);
map.put("昵称",i);
map.put("职位",i);
map.put("手机号",i);
map.put("邮箱",i);
map.put("创建人ID",i);
map.put("创建时间",i);
map.put("修改人ID",i);
map.put("修改时间",i);
maps.add(map);
}
return maps;
} 6.导出excel入口方法
/**
*
* 导出
* @param datas
* @param columns
* @return
* @throws Exception
*/
public static String exportExcel(List> datas, String[] columns) throws Exception {
List filePaths;
String fileName = "D:\\project\\导出优化测试\\demo\\static";
String name = "数据导出.xls";
String date="_"+new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
fileName+=File.separator+name.replace(".",date+".");
filePaths = createExcelAutoSplite(datas, columns, fileName);
fileName = fileName.replace("xls","zip");
ZipUtil.zipFiles(filePaths, fileName);
IOUtil.clearTmpFile(filePaths);
return fileName;
} 7.按大小划分生成多少个文件,刚才配置设置的是1000
/**
* 这个方法是是生成excel文件，自动进行大小划分。当超过指定大小后会创建下一个文件。
*
* @param datas 要写入excel的数据
* @param columns 将datas中的map的列与模版相对应，这个起到数据列排序的作用
* @return 本次生成的文件名的集合
*/
public static List createExcelAutoSplite(List> datas, String[] columns, String fileName) throws Exception {
int fileSize = datas.size();
int filePartOrder = 0;
List filePaths = new ArrayList();
int generateNumber = fileSize/size==1?fileSize/size:(int)fileSize/size+1;
while (generateNumber > filePartOrder) {
String createName = fileName.substring(0,fileName.indexOf("."))+filePartOrder+".xls";
int endRowCount = (datas.size() - size * filePartOrder) > size ? size * filePartOrder + size : datas.size();
createName = createExcel(size * filePartOrder, endRowCount, datas, createName, columns, columns);
filePaths.add(createName);
filePartOrder++;
}
return filePaths;
} 8.生成excel文件
/**
* 生成excel文件
*
* @param fileName 文件名称
* @param titles 标题
* @throws Exception
*/
private static String createExcel(Integer startRowCount, Integer endRowCount, List> maps, String fileName, String[] titles, String[] models) throws Exception {
SXSSFWorkbook wb=null;
try {
// 初始化EXCEL
wb = initHeader(titles);
SXSSFSheet eachSheet = wb.getSheetAt(0);
int index = 1;
CellStyle cs=getCellStyle(wb);
eachSheet.setDefaultColumnWidth(4);
for (int i = startRowCount; i < endRowCount; i++) {
SXSSFRow row = eachSheet.createRow(index);
Map data = maps.get(i - startRowCount);
for (int j = 0; j < models.length; j++) {
String value=data.get(models[j])!=null ? data.get(models[j]).toString():"";
setCell(row,value,cs,j);
setColumnWidth(eachSheet,j);
}
index++;
}
downLoadExcelToLocalPath(wb,fileName);
} catch (Exception e) {
e.printStackTrace();
}finally {
if (null != wb) {
try {
wb.dispose();
} catch (Exception e) {
e.printStackTrace();
}
}
}
return fileName;
} 9.初始化表头
/**
* 初始化EXCEL(sheet个数和标题)
*
* @param titles 标题集合
* @return XSSFWorkbook对象
*/
public static SXSSFWorkbook initHeader(String[] titles) {
SXSSFWorkbook wb = null;
try {
wb = new SXSSFWorkbook();
SXSSFSheet sheet = wb.createSheet("数据导出");
SXSSFRow row = sheet.createRow(0);
CellStyle cs=getCellStyle(wb);
sheet.setDefaultColumnWidth(4);
for (int j = 0; j < titles.length; j++) {
setCell(row,titles[j],cs,j);
setColumnWidth(sheet,j);
}
} catch (Exception e) {
e.printStackTrace();
}
return wb;
}10.设置单元格样式
/**
* 设置单元格样式
*
*/
private static CellStyle getCellStyle(SXSSFWorkbook sxssfWorkbook) {
// 设置样式
CellStyle cellStyle = sxssfWorkbook.createCellStyle();
// 设置字体
Font font = sxssfWorkbook.createFont();
font.setFontName("宋体");
font.setFontHeightInPoints((short) 10);
cellStyle.setFont(font);
cellStyle.setBorderTop(BorderStyle.THIN);
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setBorderLeft(BorderStyle.THIN);
cellStyle.setBorderRight(BorderStyle.THIN);
cellStyle.setAlignment(HorizontalAlignment.CENTER);
return cellStyle;
}11.设置列值
public static void setCell(SXSSFRow row, String value, CellStyle cs, int i){
Cell cell=row.createCell(i);
cell.setCellType(CellType.STRING);
cell.setCellValue(value);
cell.setCellStyle(cs);
}12.设置列宽
public static void setColumnWidth(SXSSFSheet sheet, int i) {
int maxWidth = 65280;
int space = 2000;
sheet.trackAllColumnsForAutoSizing();
sheet.autoSizeColumn(i, true);
int width = sheet.getColumnWidth(i);
if (width < maxWidth - space) {
sheet.setColumnWidth(i, sheet.getColumnWidth(i) + space);
}
}13.下载生成的excel文件到本地
/**
* 下载EXCEL到本地指定的文件夹
*
* @param wb EXCEL对象SXSSFWorkbook
* @param exportPath 导出路径
*/
public static void downLoadExcelToLocalPath(SXSSFWorkbook wb, String exportPath) {
FileOutputStream fops = null;
try {
fops = new FileOutputStream(exportPath);
wb.write(fops);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != wb) {
try {
wb.dispose();
} catch (Exception e) {
e.printStackTrace();
}
}
if (null != fops) {
try {
fops.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}14.获取所有的excel文件的路径,然后生成zip,返回zip的路径
15.根据路径下载文件
public String download(String name,HttpServletResponse response) throws UnsupportedEncodingException {
response.setContentType("application/x-download");
String filedownload = name;
String filedisplay = filedownload.substring(filedownload.lastIndexOf("\\")+1,filedownload.length());
filedisplay = URLEncoder.encode(filedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);
OutputStream outp = null;
FileInputStream in = null;
try{
outp = response.getOutputStream();
in = new FileInputStream(filedownload);
byte[] b = new byte[1024];
int i = 0;
while((i = in.read(b)) > 0) {
outp.write(b, 0, i);
}
outp.flush();
File file=new File(name);
System.out.println(file.getParentFile());
IOUtil.clearTmpFile(file.getParentFile().listFiles());
} catch(Exception e){
System.out.println("Error!");
e.printStackTrace();
}finally{
if(in != null)
{
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
in = null;
}
if(outp != null)
{
try {
outp.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outp = null;
}
}
return null;
}好了，以上就是SXSSFWorkbook的生成方法，觉得写的好麻烦点个赞,加油噢!
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https://download.csdn.net/my