如何解决使用servlet和itext 7生成将多个pdf分组的zip文件
我正在尝试使用itext7将多个生成的pdf放入servlet的zip中,我设法将一个pdf放入zip文件中,但没有更多。这是代码:
private void printMore(HttpServletRequest req,HttpServletResponse resp) throws SQLException {
String masterPath = req.getServletContext().getRealPath("/assets/template/templateStatement.pdf");
try (PdfReader reader = new PdfReader(masterPath);
ZipOutputStream zipFile = new ZipOutputStream(resp.getOutputStream());
PdfWriter writer = new PdfWriter(zipFile);
PdfDocument pdf = new PdfDocument(reader,writer);
Document doc = new Document(pdf)) {
List<Student> studentList = getFactoryDAO().getStatementDAO().selectStudentHasBalance();
for (Student student : studentList){
// Generate PDF for the student
PdfPage page = pdf.getPage(1);
PdfCanvas canvas = new PdfCanvas(page);
FontProgram fontProgram = FontProgramFactory.createFont();
PdfFont font = PdfFontFactory.createFont(fontProgram,"utf-8",true);
canvas.setFontAndSize(font,10);
canvas.beginText();
canvas.setTextMatrix(178,650); // student code
canvas.showText(student.getS_Code());
canvas.setTextMatrix(200,610); // Date of Statement
canvas.showText(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
canvas.endText();
float[] pointsWidth = {60f,120f,70f,70f};
Table table = new Table(pointsWidth);
table.setMarginTop(280);
table.setMarginLeft(70);
table.setFont(font);
table.setFontSize(10);
table.setTextAlignment(TextAlignment.CENTER);
//Header Table
table.addCell(new Cell().add("Date Inscription"));
table.addCell(new Cell().add("Name"));
table.addCell(new Cell().add("Fees"));
table.addCell(new Cell().add("Observation"));
//Detail Table
table.addCell(new Cell().add(student.getTxnDate()));
table.addCell(new Cell().add(student.getS_FullName));
table.addCell(new Cell().add(student.getFees));
table.addCell(new Cell().add(student.getObservation));
doc.add(table);
ZipEntry zipEntry = new ZipEntry(student.getS_Code() + "_" + student.getS_LName() + ".pdf");
zipFile.putNextEntry(zipEntry);
//zipFile.write(); Shall I use it?
}
} catch (IOException e) {
e.printStackTrace();
}
resp.setHeader("Content-disposition","attachement; filename=test.zip");
resp.setContentType("application/zip");
}
我已经基于此this post和this post,但是无法正常工作。我已经检查了更多类似this的帖子,但是itext7的版本没有提到的PdfWriter.getInstance。我已经尝试了更多的东西,但是无法继续前进。
已更新:
在Enterman建议之后,我像这样更新了它:
String masterPath = req.getServletContext().getRealPath("/assets/template/templateStatement.pdf");
try (PdfReader reader = new PdfReader(masterPath);
ZipOutputStream zipFile = new ZipOutputStream(resp.getOutputStream());
PdfWriter writer = new PdfWriter(zipFile);
PdfDocument pdf = new PdfDocument(reader,writer)
) {
List<Student> studentList = getFactoryDAO().getStatementDAO().selectStudentHasBalance();
for (Student student : studentList){
try (Document doc = new Document(pdf)){
// Generate PDF for the student
PdfPage page = pdf.getPage(1);
PdfCanvas canvas = new PdfCanvas(page);
FontProgram fontProgram = FontProgramFactory.createFont();
PdfFont font = PdfFontFactory.createFont(fontProgram,70f};
Table table = new Table(pointsWidth);
table.setMarginTop(280);
table.setMarginLeft(70);
table.setFont(font);
table.setFontSize(10);
table.setTextAlignment(TextAlignment.CENTER);
//Header Table
table.addCell(new Cell().add("Date Inscription"));
table.addCell(new Cell().add("Name"));
table.addCell(new Cell().add("Fees"));
table.addCell(new Cell().add("Observation"));
//Detail Table
table.addCell(new Cell().add(student.getTxnDate()));
table.addCell(new Cell().add(student.getS_FullName));
table.addCell(new Cell().add(student.getFees));
table.addCell(new Cell().add(student.getObservation));
doc.add(table);
ZipEntry zipEntry = new ZipEntry(student.getS_Code() + "_" + student.getS_LName() + ".pdf");
zipFile.putNextEntry(zipEntry);
//zipFile.write(); Shall I use it?
}
}
} catch (IOException e) {
e.printStackTrace();
}
resp.setHeader("Content-disposition","attachement; filename=test.zip");
resp.setContentType("application/zip");
但仍然没有运气。
欢迎您的帮助。
解决方法
您应该尝试使用FileInputStream,如下所示(我自己的代码,在生产中运行良好)
private File createZip(List<File> forZip,LocalDate date) {
String zipName = Constants.ORDER_FILE_PATH + date.getYear() +"-" + date.getMonth().getValue() + "-" + date.getMonth().getDisplayName(TextStyle.FULL,Locale.FRENCH) + ".zip";
FileOutputStream fos = null;
try {
fos = new FileOutputStream(zipName);
ZipOutputStream zipOut = new ZipOutputStream(fos);
for (File srcFile : forZip) {
FileInputStream fis = new FileInputStream(srcFile);
ZipEntry zipEntry = new ZipEntry(srcFile.getName());
zipOut.putNextEntry(zipEntry);
byte[] bytes = new byte[1024];
int length;
while((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes,length);
}
fis.close();
//srcFile.delete();
}
zipOut.close();
fos.close();
} catch (IOException e) {
logger.error("createZip",e);
}
return new File(zipName);
}
,
特别感谢BenjaminD,Enterman的支持以及所有堆栈社区。 p>
我将这个答案发布给那些与我面临同样问题的人。 (我被困了4天)。 “使用itext 7和servlet生成多个PDF”
正如Enterman所说:“需要文档的新实例”。另外还需要PdfDocument。并且按照BenjaminD的指示:“先将文件放入zip文件中,然后再生成PDF文件。”
String masterPath = req.getServletContext().getRealPath("/assets/template/templateStatement.pdf");
try (ZipOutputStream zipOut = new ZipOutputStream(resp.getOutputStream())) {
Liste<File> listFile = new ArrayList<>();
List<Student> studentList = getFactoryDAO().getStatementDAO().selectStudentHasBalance();
for (Student student : studentList){
File file = new File(student.getS_Code()+"_"+new SimpleDateFormat("yyyy-MM-dd").format(new Date())+".pdf");
try (PdfDocument pdf = new PdfDocument(new PdfReader(masterPath),new PdfWriter(file.getName()))
Document doc = new Document(pdf)){
// Generate PDF for the student
PdfPage page = pdf.getPage(1);
PdfCanvas canvas = new PdfCanvas(page);
FontProgram fontProgram = FontProgramFactory.createFont();
PdfFont font = PdfFontFactory.createFont(fontProgram,"utf-8",true);
canvas.setFontAndSize(font,10);
canvas.beginText();
canvas.setTextMatrix(178,650); // student code
canvas.showText(student.getS_Code());
canvas.setTextMatrix(200,610); // Date of Statement
canvas.showText(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
canvas.endText();
float[] pointsWidth = {60f,120f,70f,70f};
Table table = new Table(pointsWidth);
table.setMarginTop(280);
table.setMarginLeft(70);
table.setFont(font);
table.setFontSize(10);
table.setTextAlignment(TextAlignment.CENTER);
//Header Table
table.addCell(new Cell().add("Date Inscription"));
table.addCell(new Cell().add("Name"));
table.addCell(new Cell().add("Fees"));
table.addCell(new Cell().add("Observation"));
//Detail Table
table.addCell(new Cell().add(student.getTxnDate()));
table.addCell(new Cell().add(student.getS_FullName));
table.addCell(new Cell().add(student.getFees));
table.addCell(new Cell().add(student.getObservation));
doc.add(table);
listFile.add(file);
}
}
File zipFile = createZip(listFile,newSimpleDateFormat("yyyy-MM-dd").format(new Date())); //BenjaminD source in answer
ZipEntry zipEntry = new ZipEntry(zipFile.getName);
zipEntry.putNextEntry(zipEntry);
fileInputStream fis = new FileInputStream(zipFile);
byte[] bytes = new byte[1024];
int length;
while((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes,length);
}
fis.close();
resp.setHeader("Content-disposition","attachement; filename=" + zipFile);
resp.setContentType("application/zip");
} catch (IOException e) {
e.printStackTrace();
}
它将zip放入zip中(可以直接使用FileOutpuStream而不将其再次放入zip中。)
再次感谢您。
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