这是我的源代码。
Document document = new Document();
String txtVehNo = "";
String fDate = "", tDate = "", remtype = "0";
String fileName = "Reminders_" + Utility.sysDate("yyyy_MM_dd") + ".pdf";
String asDate = Utility.sysDate("dd/MM/yyyy");
ArrayList<ReminderPDF> reminderPDFs = null;
UserDetails userDetails = null;
String txtMarNo = "";
String formattedDate = "";
String address = "";
Blob imageBlob = null;
byte[] imageBytes = new byte[0];
try {
txtVehNo = request.getParameter("txtVehNo2");
fDate = request.getParameter("txtDate3");
tDate = request.getParameter("txtDate4");
remtype = request.getParameter("remtype");
txtMarNo = request.getParameter("txtMarNo");
if (txtVehNo != null && txtVehNo != "") {
reminderPDFs = DataManagerBean.downloadRemindersForRequirementLetter(txtVehNo, remtype);
} else if (txtMarNo != null && txtMarNo != "") {
reminderPDFs = DataManagerBean.downloadRemindersForRequirementLetterByMarNo(txtMarNo, remtype);
} else {
reminderPDFs = DataManagerBean.downloadRemindersForRequirementLetter(fDate, tDate, remtype);
}
if (reminderPDFs.size() > 0) {
response.setContentType("application/pdf");
response.setHeader("Content-disposition", "attachment; filename=\"" + fileName + "\"");
PdfWriter.getInstance(document, response.getOutputStream());
//PdfWriter.getInstance(document, new FileOutputStream(fileName));
document.open();
document.setPageSize(PageSize.A4);
document.setMargins(85, 85, 85, 85);
for (int i = 0; i < reminderPDFs.size(); i++) {
String adrstr[] = reminderPDFs.get(i).address.split("\r\n");
address = reminderPDFs.get(i).address.replaceAll(adrstr[adrstr.length - 1], "");
document.newPage();
Paragraph[] paragraph = new Paragraph[8];
paragraph[0] = new Paragraph(new Phrase(reminderPDFs.get(i).mainHeader, FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD)));
paragraph[0].setAlignment(Element.ALIGN_RIGHT);
document.add(paragraph[0]);
paragraph[1] = new Paragraph(new Phrase(reminderPDFs.get(i).subHeader, FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph[1].setAlignment(Element.ALIGN_RIGHT);
document.add(paragraph[1]);
if (reminderPDFs.get(i).print.equals("Y")) {
paragraph[2] = new Paragraph(new Phrase("(Reprint)", FontFactory.getFont(FontFactory.COURIER, 10)));
} else {
paragraph[2] = new Paragraph(new Phrase("", FontFactory.getFont(FontFactory.COURIER, 11)));
}
paragraph[2].setAlignment(Element.ALIGN_RIGHT);
document.add(paragraph[2]);
paragraph[3] = new Paragraph(new Phrase("Date : " + reminderPDFs.get(i).asDate, FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph[3].setAlignment(Element.ALIGN_RIGHT);
document.add(paragraph[3]);
paragraph[4] = new Paragraph(new Phrase(" ", FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD)));
paragraph[4].setAlignment(Element.ALIGN_CENTER);
document.add(paragraph[4]);
paragraph[5] = new Paragraph(new Phrase(address, FontFactory.getFont(FontFactory.COURIER, 11, Font.BOLD)));
paragraph[5].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph[5]);
paragraph[6] = new Paragraph(new Phrase("\n" + adrstr[adrstr.length - 1], FontFactory.getFont(FontFactory.COURIER, 11, Font.PLAIN)));
paragraph[6].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph[6]);
paragraph[7] = new Paragraph(new Phrase(" ", FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD)));
paragraph[7].setAlignment(Element.ALIGN_CENTER);
document.add(paragraph[7]);
PdfPTable table = new PdfPTable(2);
table.setWidthPercentage(100);
formattedDate = Utility.dateFormatter(reminderPDFs.get(i).dol, "yyyy-MM-dd", "dd-MM-yyyy");
table.addCell(new Phrase("Vehicle No: " + reminderPDFs.get(i).vehno, FontFactory.getFont(FontFactory.COURIER, 11)));
table.addCell(new Phrase("MAR No : " + reminderPDFs.get(i).marno, FontFactory.getFont(FontFactory.COURIER, 11)));
table.addCell(new Phrase("Policy No : " + reminderPDFs.get(i).policyno, FontFactory.getFont(FontFactory.COURIER, 11)));
table.addCell(new Phrase("Date of Loss : " + formattedDate, FontFactory.getFont(FontFactory.COURIER, 11)));
document.add(table);
Paragraph[] paragraph2 = new Paragraph[3];
paragraph2[0] = new Paragraph(new Phrase(" ", FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD)));
paragraph2[0].setAlignment(Element.ALIGN_CENTER);
document.add(paragraph2[0]);
String[] docs = reminderPDFs.get(i).content.split("\r\n");
paragraph2[1] = new Paragraph(new Phrase(docs[0], FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph2[1].setAlignment(Element.ALIGN_JUSTIFIED);
document.add(paragraph2[1]);
paragraph2[2] = new Paragraph(new Phrase(" ", FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD)));
paragraph2[2].setAlignment(Element.ALIGN_CENTER);
document.add(paragraph2[2]);
// if (reminderPDFs.get(i).docs.length() > 0) {
int k = 1;
for (int j = 1; j < docs.length; j++) {
if (!docs[j].trim().equalsIgnoreCase("")) {
document.add(new Paragraph(new Phrase(" " + k + ". " + docs[j].trim(), FontFactory.getFont(FontFactory.COURIER, 11))));
k++;
}
}
// }
Paragraph[] paragraph3 = new Paragraph[7];
paragraph3[0] = new Paragraph(new Phrase(" ", FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD)));
paragraph3[0].setAlignment(Element.ALIGN_CENTER);
document.add(paragraph3[0]);
paragraph3[1] = new Paragraph(new Phrase("Thank You,", FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph3[1].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph3[1]);
paragraph3[2] = new Paragraph(new Phrase("Yours Faithfully,", FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph3[2].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph3[2]);
paragraph3[3] = new Paragraph(new Phrase("Union Assurance General Ltd", FontFactory.getFont(FontFactory.COURIER, 11, Font.BOLD)));
paragraph3[3].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph3[3]);
paragraph3[4] = new Paragraph(new Phrase(" ", FontFactory.getFont(FontFactory.COURIER, 12, Font.BOLD)));
paragraph3[4].setAlignment(Element.ALIGN_CENTER);
document.add(paragraph3[4]);
imageBlob = DataManagerBean.getESignature(reminderPDFs.get(i).createdUser);
if (imageBlob != null) {
imageBytes = imageBlob.getBytes(1, (int) imageBlob.length());
Image img = Image.getInstance(imageBytes);
float width = img.getWidth();
float hight = img.getHeight();
if (width > 200 || hight > 100) {
// img.scaleAbsoluteWidth(200);
// img.scaleAbsoluteHeight(100);
// img.scaleAbsolute(200f, 100f);
img.scaleToFit(200f, 100f);
}
width = img.getScaledWidth();
hight = img.getScaledHeight();
document.add(img);
}
userDetails = UserBean.getUserDetailsByUserId(reminderPDFs.get(i).createdUser);
paragraph3[5] = new Paragraph(new Phrase((userDetails.getuFName().concat(" ")).concat(userDetails.getuLName()), FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph3[5].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph3[5]);
paragraph3[6] = new Paragraph(new Phrase(userDetails.getDesig(), FontFactory.getFont(FontFactory.COURIER, 11)));
paragraph3[6].setAlignment(Element.ALIGN_LEFT);
document.add(paragraph3[6]);
//DataManagerBean.printStatusUpdate(reminderPDFs.get(i).rmid, "Y");
}
document.close();
response.sendRedirect("Reminders.jsp");
} else {
if (txtVehNo != null && txtVehNo != "") {
response.sendRedirect("Reminders.jsp?msgtype=3&msg=No Records for Policy/Vehicle No. - " + txtVehNo);
} else if (txtMarNo != null && txtMarNo != "") {
response.sendRedirect("Reminders.jsp?msgtype=4&msg=No Records for Mar No. - " + txtMarNo);
} else if (fDate != null && fDate != "") {
response.sendRedirect("Reminders.jsp?msgtype=5&msg=No Records between " + fDate + " to " + tDate);
}
}
} catch (DocumentException e) {
SystemMessage.getInstance().writeMessage("ERROR : DownloadRequirements.jsp - " + e.toString());
} finally {
try {
//reminderPDFs = null;
} catch (Exception ex) {
}
}
我尝试了 img.scaleAbsoluteWidth（200）;
img.scaleAbsoluteHeight（100）;
img.scaleAbsolute（200f，100f）;
img.scaleToFit（200f，100f）;
但不是这个调整图像的大小。
当我调试代码时，我也得到 width = 200和height = 100 。我猜这意味着它的高度和宽度都发生了变化。
请告诉我这里的问题。
谢谢。
稍后注意
问题不是这些方法中的任何一种。问题是图像与该尺寸不兼容。在我将尺寸设置为100,50后，图像调整大小完美。
再次感谢你。
答案 0 :(得分：2)
你的指控＆＃34;这一切都没有调整图像大小＆＃34;是错误的，你使用错误的方法来获得图像的宽度和高度。看看chapter 2 of my book：
有多种方法可以更改图像的尺寸：
scaleToFit()的宽度和高度参数定义图像的最大尺寸。如果宽高比不同于 图像的宽高比（宽度或高度）将是 小于此方法的相应参数。- 使用
scaleAbsolute()时，将遵循宽度和高度参数。由此产生的图像有可能在X中被拉伸 如果不明智地选择参数，则为Y方向。你也可以 使用scaleAbsoluteWidth()和scaleAbsoluteHeight()。scalePercent()有两个版本：一个有两个参数，一个是宽度的百分比，另一个是高度的百分比;和另一个 只有一个参数，一个将被平均应用的百分比 宽度和高度。在iText中调整图像大小也会发生变化，这是一种常见的误解 图像的质量。理解iText很重要 按原样拍摄图像：iText不会改变像素数 图像。
有很多例子证明这些方法有效地改变了文档中图像的大小。
如果您继续阅读文档，则会在代码中发现另一个问题：
从文件创建Image实例时，您并不总是知道它 缩放之前或之后的尺寸。你可以得到宽度和 使用这些方法的图像高度：
getWidth()和getHeight()继承自Rectangle对象。它们返回图像的原始高度和宽度。getPlainWidth()和getPlainHeight()会在缩放后返回宽度和高度。这些是用于打印图像的尺寸 在页面上。getScaledWidth()和getScaledHeight()返回打印图像所需的宽度和高度。这些尺寸等于 平面宽度和高度，但图像旋转的情况除外。
在您的代码中，您获得了图片的原始尺寸。您更改图像的尺寸，然后您要求原始尺寸。在询问原始尺寸而不是原始尺寸时，您不会感到惊讶。