在JavaFX中显示pdf
在在JavaFX中显示pdf,java,javafx,Java,Javafx,在JavaFX中开发桌面应用程序,需要显示pdf。我读到在JavaFX(当前版本)中不支持pdf查看/显示,我也读到了JPedal 现在,问题是: 是否有任何外部组件或库可以在JavaFX中查看pdf?它应该是一个免费软件 (如果必须使用JPedal)如何将其嵌入到应用程序中 JPedalFX示例代码和用法 随附了使用JPedalFX的示例代码 就我而言,这有点站不住脚,但我将在这里粘贴从JPedalFX库提供的示例查看器复制的代码片段示例代码。代码依赖于类路径(或应用程序jar清单中引用的库路
JavaFX
中开发桌面应用程序,需要显示pdf。我读到在JavaFX
(当前版本)中不支持pdf查看/显示,我也读到了JPedal
现在,问题是:
JPedal
)如何将其嵌入到应用程序中李>
JPedalFX示例代码和用法 随附了使用JPedalFX的示例代码 就我而言,这有点站不住脚,但我将在这里粘贴从JPedalFX库提供的示例查看器复制的代码片段示例代码。代码依赖于类路径(或应用程序jar清单中引用的库路径)上的JPedalFX发行版附带的jpedal_lgpl.jar文件 如果您对JPedalFX的使用有进一步的疑问,我建议您(他们过去一直在回复我)
//获取文件路径。
FileChooser fc=新建FileChooser();
fc.setTitle(“打开PDF文件…”);
fc.getExtensionFilters().add(新文件选择器.ExtensionFilter(“PDF文件”,“*.PDF”));
文件f=fc.showOpenDialog(stage.getOwner());
字符串文件名=file.getAbsolutePath();
//打开文件。
PdfDecoder pdf=新的PdfDecoder();
openPdfFile(文件名);
展示页(1);
pdf.closePdfFile();
. . .
/**
*更新GUI以显示指定的页面。
*@param页
*/
专用无效显示页(整版页){
//值机范围
如果(页面>pdf.getPageCount())
返回;
如果(第<1页)
返回;
//贮藏
页码=页码;
//必要时显示/隐藏按钮
如果(page==pdf.getPageCount())
next.setVisible(false);
其他的
next.setVisible(true);
如果(第==1页)
back.setVisible(false);
其他的
back.setVisible(true);
//计算比例
int pW=pdf.getPdfPageData().getCropBoxWidth(第页);
int pH=pdf.getPdfPageData().getCropBoxHeight(第页);
维度s=Toolkit.getDefaultToolkit().getScreenSize();
s、 宽度-=100;
s、 高度-=100;
双X刻度=(双)s.宽度/pW;
双Y刻度=(双)s.高度/pH;
双刻度=xScale
SwingLabs PDF渲染器
此外,我过去使用一个旧的基于SwingLabs Swing的pdf渲染器和JavaFX为我的应用程序渲染pdf。尽管在我开发浏览器时,Swing/JavaFX集成不是JavaFX的一个受支持的功能,但它对我来说仍然很好。集成代码位于和中
请注意,Java 2.2和Java 8都支持这一点。JPedalFX示例代码和用法
package de.vogella.itext.write;
import java.io.FileOutputStream;
import java.util.Date;
import com.itextpdf.text.Anchor;
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Chapter;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.List;
import com.itextpdf.text.ListItem;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Section;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
public class FirstPdf {
private static String FILE = "c:/temp/FirstPdf.pdf";
private static Font catFont = new Font(Font.FontFamily.TIMES_ROMAN, 18,
Font.BOLD);
private static Font redFont = new Font(Font.FontFamily.TIMES_ROMAN, 12,
Font.NORMAL, BaseColor.RED);
private static Font subFont = new Font(Font.FontFamily.TIMES_ROMAN, 16,
Font.BOLD);
private static Font smallBold = new Font(Font.FontFamily.TIMES_ROMAN, 12,
Font.BOLD);
public static void main(String[] args) {
try {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(FILE));
document.open();
addMetaData(document);
addTitlePage(document);
addContent(document);
document.close();
} catch (Exception e) {
e.printStackTrace();
}
}
// iText allows to add metadata to the PDF which can be viewed in your Adobe
// Reader
// under File -> Properties
private static void addMetaData(Document document) {
document.addTitle("My first PDF");
document.addSubject("Using iText");
document.addKeywords("Java, PDF, iText");
document.addAuthor("Lars Vogel");
document.addCreator("Lars Vogel");
}
private static void addTitlePage(Document document)
throws DocumentException {
Paragraph preface = new Paragraph();
// We add one empty line
addEmptyLine(preface, 1);
// Lets write a big header
preface.add(new Paragraph("Title of the document", catFont));
addEmptyLine(preface, 1);
// Will create: Report generated by: _name, _date
preface.add(new Paragraph("Report generated by: " + System.getProperty("user.name") + ", " + new Date(), //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
smallBold));
addEmptyLine(preface, 3);
preface.add(new Paragraph("This document describes something which is very important ",
smallBold));
addEmptyLine(preface, 8);
preface.add(new Paragraph("This document is a preliminary version and not subject to your license agreement or any other agreement with vogella.com ;-).",
redFont));
document.add(preface);
// Start a new page
document.newPage();
}
private static void addContent(Document document) throws DocumentException {
Anchor anchor = new Anchor("First Chapter", catFont);
anchor.setName("First Chapter");
// Second parameter is the number of the chapter
Chapter catPart = new Chapter(new Paragraph(anchor), 1);
Paragraph subPara = new Paragraph("Subcategory 1", subFont);
Section subCatPart = catPart.addSection(subPara);
subCatPart.add(new Paragraph("Hello"));
subPara = new Paragraph("Subcategory 2", subFont);
subCatPart = catPart.addSection(subPara);
subCatPart.add(new Paragraph("Paragraph 1"));
subCatPart.add(new Paragraph("Paragraph 2"));
subCatPart.add(new Paragraph("Paragraph 3"));
// add a list
createList(subCatPart);
Paragraph paragraph = new Paragraph();
addEmptyLine(paragraph, 5);
subCatPart.add(paragraph);
// add a table
createTable(subCatPart);
// now add all this to the document
document.add(catPart);
// Next section
anchor = new Anchor("Second Chapter", catFont);
anchor.setName("Second Chapter");
// Second parameter is the number of the chapter
catPart = new Chapter(new Paragraph(anchor), 1);
subPara = new Paragraph("Subcategory", subFont);
subCatPart = catPart.addSection(subPara);
subCatPart.add(new Paragraph("This is a very important message"));
// now add all this to the document
document.add(catPart);
}
private static void createTable(Section subCatPart)
throws BadElementException {
PdfPTable table = new PdfPTable(3);
// t.setBorderColor(BaseColor.GRAY);
// t.setPadding(4);
// t.setSpacing(4);
// t.setBorderWidth(1);
PdfPCell c1 = new PdfPCell(new Phrase("Table Header 1"));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
c1 = new PdfPCell(new Phrase("Table Header 2"));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
c1 = new PdfPCell(new Phrase("Table Header 3"));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
table.setHeaderRows(1);
table.addCell("1.0");
table.addCell("1.1");
table.addCell("1.2");
table.addCell("2.1");
table.addCell("2.2");
table.addCell("2.3");
subCatPart.add(table);
}
private static void createList(Section subCatPart) {
List list = new List(true, false, 10);
list.add(new ListItem("First point"));
list.add(new ListItem("Second point"));
list.add(new ListItem("Third point"));
subCatPart.add(list);
}
private static void addEmptyLine(Paragraph paragraph, int number) {
for (int i = 0; i < number; i++) {
paragraph.add(new Paragraph(" "));
}
}
}
随附了使用JPedalFX的示例代码
就我而言,这有点站不住脚,但我将在这里粘贴从JPedalFX库提供的示例查看器复制的代码片段示例代码。代码依赖于类路径(或应用程序jar清单中引用的库路径)上的JPedalFX发行版附带的jpedal_lgpl.jar文件
如果您对JPedalFX的使用有进一步的疑问,我建议您(他们过去一直在回复我)
//获取文件路径。
FileChooser fc=新建FileChooser();
fc.setTitle(“打开PDF文件…”);
fc.getExtensionFilters().add(新文件选择器.ExtensionFilter(“PDF文件”,“*.PDF”));
文件f=fc.showOpenDialog(stage.getOwner());
字符串文件名=file.getAbsolutePath();
//打开文件。
PdfDecoder pdf=新的PdfDecoder();
openPdfFile(文件名);
展示页(1);
pdf.closePdfFile();
. . .
/**
*更新GUI以显示指定的页面。
*@param页
*/
专用无效显示页(整版页){
//值机范围
如果(页面>pdf.getPageCount())
返回;
如果(第<1页)
重新
package de.vogella.itext.write;
import java.io.FileOutputStream;
import java.util.Date;
import com.itextpdf.text.Anchor;
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Chapter;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.List;
import com.itextpdf.text.ListItem;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Section;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
public class FirstPdf {
private static String FILE = "c:/temp/FirstPdf.pdf";
private static Font catFont = new Font(Font.FontFamily.TIMES_ROMAN, 18,
Font.BOLD);
private static Font redFont = new Font(Font.FontFamily.TIMES_ROMAN, 12,
Font.NORMAL, BaseColor.RED);
private static Font subFont = new Font(Font.FontFamily.TIMES_ROMAN, 16,
Font.BOLD);
private static Font smallBold = new Font(Font.FontFamily.TIMES_ROMAN, 12,
Font.BOLD);
public static void main(String[] args) {
try {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(FILE));
document.open();
addMetaData(document);
addTitlePage(document);
addContent(document);
document.close();
} catch (Exception e) {
e.printStackTrace();
}
}
// iText allows to add metadata to the PDF which can be viewed in your Adobe
// Reader
// under File -> Properties
private static void addMetaData(Document document) {
document.addTitle("My first PDF");
document.addSubject("Using iText");
document.addKeywords("Java, PDF, iText");
document.addAuthor("Lars Vogel");
document.addCreator("Lars Vogel");
}
private static void addTitlePage(Document document)
throws DocumentException {
Paragraph preface = new Paragraph();
// We add one empty line
addEmptyLine(preface, 1);
// Lets write a big header
preface.add(new Paragraph("Title of the document", catFont));
addEmptyLine(preface, 1);
// Will create: Report generated by: _name, _date
preface.add(new Paragraph("Report generated by: " + System.getProperty("user.name") + ", " + new Date(), //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
smallBold));
addEmptyLine(preface, 3);
preface.add(new Paragraph("This document describes something which is very important ",
smallBold));
addEmptyLine(preface, 8);
preface.add(new Paragraph("This document is a preliminary version and not subject to your license agreement or any other agreement with vogella.com ;-).",
redFont));
document.add(preface);
// Start a new page
document.newPage();
}
private static void addContent(Document document) throws DocumentException {
Anchor anchor = new Anchor("First Chapter", catFont);
anchor.setName("First Chapter");
// Second parameter is the number of the chapter
Chapter catPart = new Chapter(new Paragraph(anchor), 1);
Paragraph subPara = new Paragraph("Subcategory 1", subFont);
Section subCatPart = catPart.addSection(subPara);
subCatPart.add(new Paragraph("Hello"));
subPara = new Paragraph("Subcategory 2", subFont);
subCatPart = catPart.addSection(subPara);
subCatPart.add(new Paragraph("Paragraph 1"));
subCatPart.add(new Paragraph("Paragraph 2"));
subCatPart.add(new Paragraph("Paragraph 3"));
// add a list
createList(subCatPart);
Paragraph paragraph = new Paragraph();
addEmptyLine(paragraph, 5);
subCatPart.add(paragraph);
// add a table
createTable(subCatPart);
// now add all this to the document
document.add(catPart);
// Next section
anchor = new Anchor("Second Chapter", catFont);
anchor.setName("Second Chapter");
// Second parameter is the number of the chapter
catPart = new Chapter(new Paragraph(anchor), 1);
subPara = new Paragraph("Subcategory", subFont);
subCatPart = catPart.addSection(subPara);
subCatPart.add(new Paragraph("This is a very important message"));
// now add all this to the document
document.add(catPart);
}
private static void createTable(Section subCatPart)
throws BadElementException {
PdfPTable table = new PdfPTable(3);
// t.setBorderColor(BaseColor.GRAY);
// t.setPadding(4);
// t.setSpacing(4);
// t.setBorderWidth(1);
PdfPCell c1 = new PdfPCell(new Phrase("Table Header 1"));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
c1 = new PdfPCell(new Phrase("Table Header 2"));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
c1 = new PdfPCell(new Phrase("Table Header 3"));
c1.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(c1);
table.setHeaderRows(1);
table.addCell("1.0");
table.addCell("1.1");
table.addCell("1.2");
table.addCell("2.1");
table.addCell("2.2");
table.addCell("2.3");
subCatPart.add(table);
}
private static void createList(Section subCatPart) {
List list = new List(true, false, 10);
list.add(new ListItem("First point"));
list.add(new ListItem("Second point"));
list.add(new ListItem("Third point"));
subCatPart.add(list);
}
private static void addEmptyLine(Paragraph paragraph, int number) {
for (int i = 0; i < number; i++) {
paragraph.add(new Paragraph(" "));
}
}
}
├── pom.xml
├── src
│ └── main
│ ├── java
│ │ └── me
│ │ └── example
│ │ ├── JSLogListener.java
│ │ ├── Launcher.java
│ │ └── WebController.java
│ └── resources
│ ├── build
│ │ ├── pdf.js
│ │ └── pdf.worker.js
│ ├── main.fxml
│ ├── web
│ │ ├── cmaps
│ │ ├── compatibility.js
│ │ ├── debugger.js
│ │ ├── images
│ │ ├── l10n.js
│ │ ├── locale
│ │ ├── viewer.css
│ │ ├── viewer.html
│ │ └── viewer.js
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Tab?>
<?import javafx.scene.control.TabPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.web.WebView?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="576.0" prefWidth="1024.0" xmlns="http://javafx.com/javafx/8.0.112" xmlns:fx="http://javafx.com/fxml/1" fx:controller="me.example.WebController">
<center>
<TabPane>
<tabs>
<Tab text="PDF test">
<content>
<WebView fx:id="web" minHeight="-1.0" minWidth="-1.0" />
</content>
</Tab>
</tabs>
</TabPane>
</center>
<bottom>
<Button fx:id="btn" mnemonicParsing="false" text="Open another file" BorderPane.alignment="CENTER" />
</bottom>
</BorderPane>
var DEFAULT_URL = '';
<head>
<!-- ... -->
<script src="viewer.js"></script>
<!-- CUSTOM BLOCK -->
<script>
var openFileFromBase64 = function(data) {
var arr = base64ToArrayBuffer(data);
console.log(arr);
PDFViewerApplication.open(arr);
}
function base64ToArrayBuffer(base64) {
var binary_string = window.atob(base64);
var len = binary_string.length;
var bytes = new Uint8Array( len );
for (var i = 0; i < len; i++) {
bytes[i] = binary_string.charCodeAt(i);
}
return bytes.buffer;
}
</script>
<!-- end of CUSTOM BLOCK -->
</head>
public class WebController implements Initializable {
@FXML
private WebView web;
@FXML
private Button btn;
public void initialize(URL location, ResourceBundle resources) {
WebEngine engine = web.getEngine();
String url = getClass().getResource("/web/viewer.html").toExternalForm();
// connect CSS styles to customize pdf.js appearance
engine.setUserStyleSheetLocation(getClass().getResource("/web.css").toExternalForm());
engine.setJavaScriptEnabled(true);
engine.load(url);
engine.getLoadWorker()
.stateProperty()
.addListener((observable, oldValue, newValue) -> {
// to debug JS code by showing console.log() calls in IDE console
JSObject window = (JSObject) engine.executeScript("window");
window.setMember("java", new JSLogListener());
engine.executeScript("console.log = function(message){ java.log(message); };");
// this pdf file will be opened on application startup
if (newValue == Worker.State.SUCCEEDED) {
try {
// readFileToByteArray() comes from commons-io library
byte[] data = FileUtils.readFileToByteArray(new File("/path/to/file"));
String base64 = Base64.getEncoder().encodeToString(data);
// call JS function from Java code
engine.executeScript("openFileFromBase64('" + base64 + "')");
} catch (Exception e) {
e.printStackTrace();
}
}
});
// this file will be opened on button click
btn.setOnAction(actionEvent -> {
try {
byte[] data = FileUtils.readFileToByteArray(new File("/path/to/another/file"));
String base64 = Base64.getEncoder().encodeToString(data);
engine.executeScript("openFileFromBase64('" + base64 + "')");
} catch (Exception e) {
e.printStackTrace();
}
});
}
}
#toolbarViewerRight {
display:none;
}
public class JSLogListener {
public void log(String text) {
System.out.println(text);
}
}
public class Launcher extends Application {
public static void main(String[] args) {
Application.launch();
}
public void start(Stage primaryStage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("/main.fxml"));
primaryStage.setTitle("PDF test app");
primaryStage.setScene(new Scene(root, 1280, 576));
primaryStage.show();
}
}