最近任务是完成要求：把需要导出的数据导出到excel中，要求每页按传入的参数规定数据量，便于后期更改。同时分页要实现页名是当前页数据的开始到结束。
话不多说，实现代码：
首先是参数的传入
@Value("${records:40}")
private int records; //导出时每页数据最大数量
然后下面是生成excel文件
private void DeviceExportXlsx(String exportType, List<JSONObject> exportData,List<String>titleList) {
/**
* 生成excel文件
*/
int record = 1; //当前的数据行
int pages = (exportData.size()%records==0?exportData.size()/records-1:exportData.size()/records); //总页数-1
String fileName="INMS_COREEQUIPMENT_LIST_"+format.format(new Date())+"." + exportType; //".xlsx"
try {
//创建工作簿
XSSFWorkbook xssfWorkbook = new XSSFWorkbook();
//创建工作表
ArrayList<XSSFSheet> sheets = new ArrayList<>();
for(int page= 0;page<=pages;page++){
XSSFSheet sheet = xssfWorkbook.createSheet();
//设置表名
if (page!=pages){
xssfWorkbook.setSheetName(page,record+"-"+(record+records-1));
}else {
xssfWorkbook.setSheetName(page,record+"-"+(record+exportData.size()%records-1));
}
//创建表头
XSSFRow head = sheet.createRow(0);
for(int i = 0;i < titleList.size();i++){
XSSFCell cell = head.createCell(i);
cell.setCellValue(titleList.get(i));
}
for (int i = 1;i <= records;i++,record++) {
if(record==exportData.size()+1){
break;
}
JSONObject json=exportData.get(record - 1);
//创建行,从第二行开始，所以for循环的i从1开始取
XSSFRow row = sheet.createRow(i);
//创建单元格，并填充数据
XSSFCell cell=null;
for(int j = 0;j < titleList.size();j++){
cell = row.createCell(j);
cell.setCellValue(json.containsKey(titleList.get(j))?json.getString(titleList.get(j)):"");
}
}
sheets.add(sheet);
System.out.println(sheets);
}
//创建临时文件的目录
File file = new File(homePath);
if(!file.exists()){
file.mkdirs();
}
//临时文件路径/文件名
String path = homePath +File.separator+ fileName;
OutputStream outputStream = new FileOutputStream(path);
xssfWorkbook.write(outputStream);
outputStream.flush();
outputStream.close();
export(path,fileName);
}catch (Exception e){
e.printStackTrace();;
}
}
附：导出的代码
public void export (String path,String fileName) throws Exception{
FileInputStream fileIn = new FileInputStream(path);
response.setContentType("application/force-download");
response.addHeader("Content-disposition", "attachment;fileName="+fileName);
OutputStream outPut = response.getOutputStream();
byte[] bytes = new byte[fileIn.available()];
fileIn.read(bytes);
outPut.write(bytes);
fileIn.close();
}
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原文链接：https://blog.csdn.net/z710757293/article/details/107537696