1、jar包
<dependency>
<groupId>com.aspose.cells</groupId>
<artifactId>aspose-cells</artifactId>
<version>8.5.2</version>
</dependency>
2、在根目錄放：license.xml
具體資源請下載：
https://download.csdn.net/download/gzc_870301/12403483
/**
*@description excel轉pdf 解決摺疊問題（列太多）
* @author gezc30201
* @date 2020/5/9
*/
@Slf4j
public class ExcelToPdfUtil {
/**
*@description 獲取license 去除水印
* @return
* @author gezc30201
* @date 2020/5/9
*/
public static boolean getLicense() {
boolean result = false;
try {
InputStream is = ExcelToPdfUtil.class.getClassLoader().getResourceAsStream("\\license.xml");
License aposeLic = new License();
aposeLic.setLicense(is);
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
*@description excel 轉爲pdf 輸出。
* @param sourceFilePath excel文件
* @param desFilePathd pad 輸出文件目錄
* @return void
* @author gezc30201
* @date 2020/5/9
*/
public static void excel2pdf(String sourceFilePath, String desFilePathd ){
if (!getLicense()) { // 驗證License 若不驗證則轉化出的pdf文檔會有水印產生
return;
}
try {
Workbook wb = new Workbook(sourceFilePath); // 原始excel路徑
FileOutputStream fileOS = new FileOutputStream(desFilePathd);
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
pdfSaveOptions.setOnePagePerSheet(true);//縮放到一個頁面（如果列太多 太長）
/**
* 自動縮放了
*/
/* int[] autoDrawSheets={3};
//當excel中對應的sheet頁寬度太大時，在PDF中會拆斷並分頁。此處等比縮放。
autoDraw(wb,autoDrawSheets);*/
/**
* 以下代碼打開則只顯示第一個sheet
*/
/*int[] showSheets={0};
//隱藏workbook中不需要的sheet頁。
printSheetPage(wb,showSheets);*/
wb.save(fileOS, pdfSaveOptions);
fileOS.flush();
fileOS.close();
} catch (Exception e) {
log.error(ExceptionUtils.getTrace(e));
throw new RuntimeException();
}
}
/**
*@description 描述
* @param inbytes excel輸入流的字節數組
* @return byte[]
* @author gezc30201
* @date 2020/5/9
*/
public static byte[] excel2pdf(byte[] inbytes ) throws IOException {
if (!getLicense()) { // 驗證License 若不驗證則轉化出的pdf文檔會有水印產生
return null;
}
ByteArrayOutputStream pdfstream=null;
try {
Workbook wb = new Workbook(new ByteArrayInputStream(inbytes));// 原始excel流
pdfstream = new ByteArrayOutputStream(); //保存轉成pdf的流
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
pdfSaveOptions.setOnePagePerSheet(true);//縮放到一個頁面（如果列太多 太長）
wb.save(pdfstream, pdfSaveOptions);
byte[] outbytes = pdfstream.toByteArray();
return outbytes;
} catch (Exception e) {
log.error(ExceptionUtils.getTrace(e));
throw new RuntimeException();
}finally {
if (pdfstream!=null){
pdfstream.close();
}
}
}
/**
*@description 設置打印的sheet 自動拉伸比例
* @param wb
* @param page 自動拉伸的頁的sheet數組
* @return void
* @author gezc30201
* @date 2020/5/9
*/
public static void autoDraw(Workbook wb, int[] page){
if (null!=page&&page.length>0){
for (int i = 0; i < page.length; i++) {
wb.getWorksheets().get(i).getHorizontalPageBreaks().clear();
wb.getWorksheets().get(i).getVerticalPageBreaks().clear();
}
}
}
/**
* 隱藏workbook中不需要的sheet頁。
* @param wb
* @param page 顯示頁的sheet數組
*/
public static void printSheetPage(Workbook wb, int[] page){
for (int i= 1; i < wb.getWorksheets().getCount(); i++) {
wb.getWorksheets().get(i).setVisible(false);
}
if (null==page||page.length==0){
wb.getWorksheets().get(0).setVisible(true);
}else{
for (int i = 0; i < page.length; i++) {
wb.getWorksheets().get(i).setVisible(true);
}
}
}
/*public static void main(String[] args) {
String sourceFilePath="d:/test.xlsx";
String desFilePath="d:/rest.pdf";
excel2pdf(sourceFilePath, desFilePath);
}*/
}
controller：
@GetMapping("/previewAttach")
public void previewAttach(HttpServletResponse response, @RequestParam(value = "attach_id") String attachId) {
DownloadAttach downloadAttach = sysAttachService.downloadAttach(attachId).getResult();
if (downloadAttach == null || downloadAttach.getBytes() == null) {
log.warn("附件獲取爲空。附件id:" + attachId.replaceAll("[\r\n]", ""));
throw new BaseBizException("-1", "附件不存在");
}
/*if (!".pdf".equals(downloadAttach.getFileSuffix())){6
throw new BaseBizException("-1", "只有PDF可以預覽");
}*/
if (!DocEnum.PDF.getPointSuffix().equals(downloadAttach.getFileSuffix())&&!DocEnum.XLS.getPointSuffix().equals(downloadAttach.getFileSuffix())&&!DocEnum.XLSX.getPointSuffix().equals(downloadAttach.getFileSuffix())){
try {
downloadAttach.setBytes(Doc2PdfUtil.doc2pdf(downloadAttach.getFileSuffix().substring(1),downloadAttach.getBytes()));
} catch (Exception e) {
log.error(ExceptionUtils.getTrace(e));
throw new BaseBizException("-1", "openoffice服務連接不上或者轉換pdf失敗");
}
}
if (DocEnum.XLS.getPointSuffix().equals(downloadAttach.getFileSuffix())||DocEnum.XLSX.getPointSuffix().equals(downloadAttach.getFileSuffix())){
try {
downloadAttach.setBytes(ExcelToPdfUtil.excel2pdf(downloadAttach.getBytes()));
} catch (IOException e) {
log.error(ExceptionUtils.getTrace(e));
throw new BaseBizException("-1", "excel轉換pdf失敗");
}
}
OutputStream os = null;
try {
response.setHeader("content-length", String.valueOf(downloadAttach.getBytes().length));
// 預覽
response.setContentType("application/pdf;charset=utf-8");
response.setHeader("content-disposition", "inline;filename=" +
java.net.URLEncoder.encode(downloadAttach.getFileName(), "UTF-8"));
os = response.getOutputStream();
//os.write(downloadAttach.getBytes(),0,downloadAttach.getBytes().length);
int lens = downloadAttach.getBytes().length;
int flag = 0;
while (lens > 0){
os.write(Arrays.copyOfRange(downloadAttach.getBytes(),flag * DOWNLOAD_LENS,(lens > DOWNLOAD_LENS) ? (flag + 1) * DOWNLOAD_LENS : (flag * DOWNLOAD_LENS + lens)));
flag ++;
log.info(flag);
lens -= DOWNLOAD_LENS;
}
} catch (Exception e) {
log.error("預覽附件報錯。附件id:" + attachId.replaceAll("[\r\n]", ""));
log.error(ExceptionUtils.getTrace(e));
} finally {
if (os != null) {
try {
os.flush();
os.close();
} catch (IOException e) {
log.error(ExceptionUtils.getTrace(e));
}
}
}
}
預覽效果如下，後面的下面沒有缺失數據 是我沒填
