最近项目遇到一个需求，需要打印excel，然后将打印记录进行持久化，还要对excel中的参数进行计算。最开始的思路是，调用java自身的api—— javax.print包下面的打印功能，把excel转化为freemarker模板，网友们基本都是这样做的。但是，理想跟现实总是有差距的，这样做得到的结果是，调用的打印机始终都是与服务器连接的打印机，并且java支持的打印只能打印图片格式的，并不能打印文档，只好放弃。
然后换策略。另一种思路：前端页面上输入excel需要的内容，通过poi对excel进行读写，然后将excel转化成HTML页面返回给前端，前端页面调用打印机，这样任何一台电脑都可以打印啦~~
上代码：
1.前端页面：
2.更新excel
public void updateExcel(PrintVo printVo)throws Exception{
String filePath = productPath;
File excelFile = new File(filePath);
FileInputStream fileInputStream = new FileInputStream(excelFile);
HSSFWorkbook workbook = new HSSFWorkbook(fileInputStream);
HSSFSheet sheet1 = workbook.getSheetAt(0);
HSSFRow row5 = sheet1.getRow(5);
row5.getCell(1).setCellValue(printVo.getGoodsName());
HSSFRow row7 = sheet1.getRow(7);
row7.getCell(1).setCellValue(printVo.getGoodsNum()+printVo.getUnits());
HSSFRow row9 = sheet1.getRow(9);
row9.getCell(1).setCellValue(printVo.getProDate());
FileOutputStream os;
os = new FileOutputStream(filePath);
workbook.write(os);
os.close();
}
3.把excel转化成HTML
public String excelToHtml() throws Exception {
String filePath = productPath;
File excelFile = new File(filePath);
InputStream is = null;
OutputStream out = null;
StringWriter writer = null;
String content = null;
try {
if (excelFile.exists()) {
is = new FileInputStream(excelFile);
// Workbook workBook = WorkbookFactory.create(is);
HSSFWorkbook workBook = new HSSFWorkbook(is);
ExcelToHtmlConverter converter = new ExcelToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());
//设置不输出行号(1 2 3...)及列标(A B C...)等
converter.setOutputColumnHeaders(false);
converter.setOutputHiddenColumns(false);
converter.setOutputColumnHeaders(false);
converter.setOutputLeadingSpacesAsNonBreaking(false);
converter.setOutputRowNumbers(false);
converter.processWorkbook(workBook);
writer = new StringWriter();
Transformer serializer = TransformerFactory.newInstance().newTransformer();
serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
serializer.setOutputProperty(OutputKeys.INDENT, "YES");
serializer.setOutputProperty(OutputKeys.METHOD, "HTML");
serializer.transform(
new DOMSource(converter.getDocument()),
new StreamResult(writer));
// out = new FileOutputStream(htmlFile);
content = writer.toString();
//替换掉Sheet1 Sheet2 Sheet3...
content = content.replaceAll("<h2>Sheet[\\d]</h2>", "")
.replaceAll("<h2>第[一二三四五六七八九十壹贰叁肆伍陆柒捌玖拾]页</h2>", "");
}
} catch (IOException | ParserConfigurationException | TransformerException e) {
e.printStackTrace();
} finally {
try {
if (is != null) {
is.close();
}
if (out != null) {
out.close();
}
if (writer != null) {
writer.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return content;
}
4.前端打印返回的html页面
if (res.resultCode == 0) {
var printWin=window.open("打印窗口", "_blank");
printWin.document.write(res.data);
printWin.document.close();
printWin.print();
printWin.close();
5.效果图