这里写自定义目录标题
- 将html文件转成pdf文件
- 依赖
- 代码实现
- 工具类
- 总结
将html文件转成pdf文件
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。
依赖
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。
<!-- pdf -->
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.13</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.13</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>
<!-- 转换html为标准xhtml包-->
<dependency>
<groupId>net.sf.jtidy</groupId>
<artifactId>jtidy</artifactId>
<version>r938</version>
</dependency>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 = "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n" +
"<html>\n" +
"<body>\n" +
"<h2 style=\"text-align: center\"> "+ checkListInfo.getChecklistName()+" </h2>"+
"<table style='width: 100%;border: 1px solid red;text-align: left'>\n" +
" <tr>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXX：</td>\n" +
" <td style='line-height: 1.5em'>"+ cont.getArcId()+"</td>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXX：</td>\n" +
" <td style='line-height: 1.5em'>"+ cont.getSsr()+"</td>\n" +
" </tr>\n" +
" <tr>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXX：</td>\n" +
" <td style='line-height: 1.5em'>"+ cont.getTypeName()+"</td>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXX：</td>\n" +
" <td style='line-height: 1.5em'>"+ cont.getHappenTime()+"</td>\n" +
" </tr>\n" +
" <tr>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXX：</td>\n" +
" <td style='line-height: 1.5em'>"+ cont.getAdep()+"</td>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXXX：</td>\n" +
" <td style='line-height: 1.5em'>"+ cont.getAdes()+"</td>\n" +
" </tr>\n" +
"</table>"+checkListInfo.getContent()+"</body>\n" +
"</html>";
} else {
content = "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n" +
"<html>\n" +
"<body>\n" +
"<h2 style=\"text-align: center\"> " + checkListInfo.getChecklistName() + " </h2>" +
"<table style='width: 100%;border: 1px solid red;text-align: left'>\n" +
" <tr>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXXX：</td>\n" +
" <td style='line-height: 1.5em'>" + checkListInfo.getTypeName() + "</td>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXXX：</td>\n" +
" <td style='line-height: 1.5em'>" + checkListInfo.getSeatName() + "</td>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXXX：</td>\n" +
" <td style='line-height: 1.5em'>" + checkListInfo.getConsuming() + "</td>\n" +
" </tr>\n" +
" <tr>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXXX：</td>\n" +
" <td style='line-height: 1.5em'>" + checkListInfo.getUserName() + "</td>\n" +
" <td style='font-weight: bold;line-height: 1.5em'>XXXXX：</td>\n" +
" <td style='line-height: 1.5em'>" + checkListInfo.getEndTime() + "</td>\n" +
" </tr>\n" +
"</table>" + checkListInfo.getContent() + "</body>\n" +
"</html>";
}
FileWriter fwriter = null;
try {
// true表示不覆盖原来的内容，而是加到文件的后面。若要覆盖原来的内容，直接省略这个参数就好
fwriter = new FileWriter(filePath,true);
fwriter.write(content);
} catch (IOException ex) {
ex.printStackTrace();
} finally {
try {
fwriter.flush();
fwriter.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
//首先查看当前服务器上是否存在pdf
//获取服务器上全部文件名
String fileName = "checkList.pdf";
List<String> fileNames = readAllFile(upLoadPath);
if (fileNames != null && fileNames.size() > 0) {
if (fileNames.contains(fileName)) {
//已存在pdf，删除当前pdf
Boolean b = deleteUploadfile(upLoadPath+"/checkList.pdf");
logger.info("删除操作{}",b);
if (!b) {
//未删除成功
throw new RuntimeException("当前文件下存在旧的pdf文件，删除失败！");
}
}
}
//将写入完成的html页面转成pdf
PDFUtils.convertHtmlToPdf(
"logs/atcmis-logs/flow/flowBase/2022-07-19/test.html"
,upLoadPath+"/checkList.pdf");工具类
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();
}
}
/*把html文件转换为pdf文件输出流*/
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;
}
/*把html文件转换为pdf文件*/
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();
}
/*把html文件转换为pdf文件*/
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();
}
/*创建pdf 返回pdf全路径*/
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();
}
/*将不标准html转换为标准xhtml格式*/
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();
}
/*输入流中获取字节数组 */
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();
}
/** 解决中文字体 */
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。
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
