- 将html文件转成pdf文件
- 依赖
- 代码实现
- 工具类
- 总结
需求场景:后端根据数据库数据,生成产品所需要的pdf样式。
本来以为只是简单的pdf制作模板,然后填充,后来发现,离了大谱,需要的pdf文件中有一部分是html页面代码块,使用模板填充,难实现转译,所以更换思路,全部拼接成html代码,然后转成pdf,简单高效。
我的实现,是使用iText插件,因人而异,看自己喜欢,以下是pom文件中导入的依赖。
com.itextpdf.tool
xmlworker
5.5.13
com.itextpdf
itextpdf
5.5.13
com.itextpdf
itext-asian
5.2.0
net.sf.jtidy
jtidy
r938
代码实现
我是将逻辑写在了实现层(impl),controller层就是简单的调用一下service就可以了,ChecklistInfoDto,SpecialSituation都是普通的bean,根据自己的查询结果即可 :
//XXXX信息
ChecklistInfoDto checkListInfo = checklistMapper.getContByCheckListId(id);
//XXXXX信息
String checkListId = checkListInfo.getChecklistId();
SpecialSituation cont = specialSituationMapper.getContByTemplateId(checkListId);
if (cont == null || ObjectUtils.isEmpty(cont)) {
logger.info("当前id{}未查询到XXXX信息",checkListId);
throw new RuntimeException("XXX"+checkListId+"未查询到XXXXX信息");
}
String content;
//判断当前XXXXXX 我需要生成两种不同的pdf,所以加了个类型判断区别,按照自己的需求来
if (EMERGENCY.equals(checkListInfo.getTypeName())) {
content = "n" +
"n" +
"n" +
" "+ checkListInfo.getChecklistName()+" "+
"
| XXXX: | n" + ""+ cont.getArcId()+" | n" + "XXXX: | n" + ""+ cont.getSsr()+" | n" + "
| XXXX: | n" + ""+ cont.getTypeName()+" | n" + "XXXX: | n" + ""+ cont.getHappenTime()+" | n" + "
| XXXX: | n" + ""+ cont.getAdep()+" | n" + "XXXXX: | n" + ""+ cont.getAdes()+" | n" + "
" + checkListInfo.getChecklistName() + " " + "
| XXXXX: | n" + "" + checkListInfo.getTypeName() + " | n" + "XXXXX: | n" + "" + checkListInfo.getSeatName() + " | n" + "XXXXX: | n" + "" + checkListInfo.getConsuming() + " | n" + "
| XXXXX: | n" + "" + checkListInfo.getUserName() + " | n" + "XXXXX: | n" + "" + checkListInfo.getEndTime() + " | n" + "
上面的代码,使用到了转换的工具类,代码如下:
public class PDFUtils {
private static final Logger logger = LoggerFactory.getLogger(PDFUtils.class);
private static String path = "C:\11\" + new Random().nextInt() + ".pdf";; // 生成PDF后的存放路径
public static void main(String[] args) {
try {
convertHtmlToPdf("logs/atcmis-logs/flow/flowBase/2022-07-19/test.html",
path);
} catch (IOException | DocumentException e) {
e.printStackTrace();
}
}
public static byte[] convertHtmlToPdf(byte[] html) throws IOException, DocumentException {
String pdfName = UUID.randomUUID()+".pdf";
String pdfPath = path+pdfName;
convertHtmlToPdf(html,pdfPath);
File file = new File(pdfPath);
InputStream inputStream = new FileInputStream(file);
byte[] buffer = getByteByInputStream(inputStream);
inputStream.close();
file.delete();
return buffer;
}
public static void convertHtmlToPdf(byte[] html,String pdfPath) throws IOException, DocumentException {
logger.info("源html文件传入字节流!");
OutputStream outputStream = new FileOutputStream(pdfPath);
Rectangle rectPageSize = new Rectangle(PageSize.A4);// A4纸张
Document document = new Document(rectPageSize, 40, 40, 40, 40);// 上、下、左、右间距
PdfWriter pdfWriter = PdfWriter.getInstance(document,outputStream);
document.open();
ByteArrayInputStream bin = new ByteArrayInputStream(htmlFormat(html));
logger.info("源html文件读取为缓冲字节流!");
XMLWorkerHelper wh = XMLWorkerHelper.getInstance();
wh.parseXHtml(pdfWriter, document, bin, null,Charset.forName("UTF-8"), new ChinaFontProvide());
logger.info("源html文件转换为pdf文件!");
document.close();
}
public static void convertHtmlToPdf(String htmlPath,String pdfPath) throws IOException, DocumentException {
InputStream htmlFileStream = new FileInputStream(htmlPath);
byte[] buffer = getByteByInputStream(htmlFileStream);
ByteArrayInputStream bin = new ByteArrayInputStream(htmlFormat(buffer));
// 创建一个document对象实例
Document document = new Document();
// 为该Document创建一个Writer实例
PdfWriter pdfwriter = PdfWriter.getInstance(document,new FileOutputStream(pdfPath));
pdfwriter.setViewerPreferences(PdfWriter.HideToolbar);
// 打开当前的document
document.open();
XMLWorkerHelper wh = XMLWorkerHelper.getInstance();
wh.parseXHtml(pdfwriter, document,bin,null,Charset.forName("UTF-8"),new ChinaFontProvide());
htmlFileStream.close();
document.close();
}
public static String createPdf(String pdfPath) throws DocumentException, IOException {
// 生成pdf 文件
String pdfName = UUID.randomUUID()+".pdf";
File outPdf = new File(pdfPath,pdfName);
OutputStream file = new FileOutputStream(outPdf);
// 创建pdf Document
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, file);
//打开Document写入内容
document.open();
document.add(new Paragraph("Hello World, iText"));
document.add(new Paragraph(new Date().toString()));
document.close();
file.close();
// 返回生成的pdf路径
return outPdf.getPath();
}
public static byte[] htmlFormat(byte[] html) throws FileNotFoundException{
//输出为xhtml
ByteArrayOutputStream baos = new ByteArrayOutputStream();
// 实例化Tidy对象
Tidy tidy = new Tidy();
// 设置输入
tidy.setInputEncoding("UTF-8");
// 如果是true 不输出注释,警告和错误信息
tidy.setQuiet(true);
// 设置输出
tidy.setOutputEncoding("UTF-8");
// 不显示警告信息
tidy.setShowWarnings(false);
// 缩进适当的标签内容。
tidy.setIndentContent(true);
// 内容缩进
tidy.setSmartIndent(true);
tidy.setIndentAttributes(false);
// 只输出body内部的内容
// tidy.setPrintBodyOnly(true);
// 多长换行
tidy.setWraplen(1024);
// 输出为xhtml
tidy.setXHTML(true);
// 去掉没用的标签
tidy.setMakeClean(true);
// 清洗word2000的内容
tidy.setWord2000(true);
// 设置错误输出信息
tidy.setErrout(new PrintWriter(System.out));
tidy.parseDOM(new ByteArrayInputStream(html), baos);
return baos.toByteArray();
}
public static byte[] getByteByInputStream(InputStream inputStream) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
byte[] b = new byte[1024];
int n;
//每次从fis读1024个长度到b中,fis中读完就会返回-1
while ((n = inputStream.read(b)) != -1)
{
bos.write(b, 0, n);
}
bos.close();
return bos.toByteArray();
}
public static final class ChinaFontProvide implements FontProvider {
@Override
public Font getFont(String arg0, String arg1, boolean arg2, float arg3, int arg4, BaseColor arg5) {
BaseFont bfChinese = null;
try {
bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
} catch (Exception e) {
e.printStackTrace();
}
Font FontChinese = new Font(bfChinese, arg3, arg4);
return FontChinese;
}
@Override
public boolean isRegistered(String arg0) {
return false;
}
}
}
总结
以上就是全部的代码,没有接触,会感觉较难,开发起来,容易上手,至于iText的局限性,百度有很多,感兴趣可以自行搜索。最后希望有看到的大佬,多多斧正,谢谢啦。



