Java 如何在VAADIN中查看PDF文档
我想建立一个视图，在其中可以在Vaadin中显示PDF、Word、纯文本文档。有办法做到这一点吗？谢谢。您可以使用Vaadin文档中包含的样本 （见11.6.3.打印PDF） 其他有用的例子：Java 如何在VAADIN中查看PDF文档,java,vaadin,document-view,Java,Vaadin,Document View,我想建立一个视图，在其中可以在Vaadin中显示PDF、Word、纯文本文档。有办法做到这一点吗？谢谢。您可以使用Vaadin文档中包含的样本 （见11.6.3.打印PDF） 其他有用的例子： package com.vaadin.book.examples.advanced; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; im
package com.vaadin.book.examples.advanced;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Date;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
import com.vaadin.book.examples.BookExampleBundle;
import com.vaadin.terminal.ExternalResource;
import com.vaadin.terminal.StreamResource;
import com.vaadin.terminal.StreamResource.StreamSource;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Button.ClickListener;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
public class PrintingExample extends CustomComponent implements BookExampleBundle {
private static final long serialVersionUID = 97529549237L;
public void init(String context) {
VerticalLayout layout = new VerticalLayout();
if ("this".equals(context))
printThisPage();
else if ("open".equals(context))
printOpenedPage();
else if ("nonblocking".equals(context))
printNonblockingPage();
else if ("pdfgeneration".equals(context))
pdfgeneration(layout);
else
setCompositionRoot(new Label("Invalid Context"));
if (getCompositionRoot() == null)
setCompositionRoot(layout);
}
void printThisPage () {
// BEGIN-EXAMPLE: advanced.printing.this
final Button print = new Button("Print This Page");
print.addListener(new ClickListener() {
private static final long serialVersionUID = 15335453452L;
public void buttonClick(ClickEvent event) {
print.getWindow().executeJavaScript("print();");
}
});
// END-EXAMPLE: advanced.printing.this
setCompositionRoot(print);
}
void printOpenedPage () {
// BEGIN-EXAMPLE: advanced.printing.open
// A button to open the printer-friendly page.
Button print = new Button("Click to Print");
print.addListener(new Button.ClickListener() {
private static final long serialVersionUID = 6588417468637527327L;
public void buttonClick(ClickEvent event) {
// Create a window that contains what you want to print
Window window = new Window("Window to Print");
// Have some content to print
window.addComponent(new Label(
"<h1>Here's some dynamic content</h1>\n" +
"<p>This is to be printed to the printer.</p>",
Label.CONTENT_XHTML));
// Add the printing window as a new application-level
// window
getApplication().addWindow(window);
// Open it as a popup window with no decorations
getWindow().open(new ExternalResource(window.getURL()),
"_blank", 500, 200, // Width and height
Window.BORDER_NONE); // No decorations
// Print automatically when the window opens.
// This call will block until the print dialog exits!
window.executeJavaScript("print();");
// Close the window automatically after printing
window.executeJavaScript("self.close();");
}
});
// END-EXAMPLE: advanced.printing.open
setCompositionRoot(print);
}
// TODO: This actually blocks also.
void printNonblockingPage () {
// A button to open the printer-friendly page.
final Button print = new Button("Click to Print");
print.addListener(new Button.ClickListener() {
private static final long serialVersionUID = 349852897523897L;
public void buttonClick(ClickEvent event) {
// Content to be printed. Must double-quote newlines.
String content = "<h1>Stuff to Print</h1>\\n" +
"<p>Important stuff</p>\\n";
// The code to print and close the window
content += "<SCRIPT language=\"JavaScript\">" +
" print();" +
" close();" +
"</SCRIPT>";
// Open the print window
String js = "popup = window.open('', 'mywindow','status=1,width=350,height=150');\n" +
"popup.document.write('"+content+"');\n";
print.getWindow().executeJavaScript(js);
}
});
setCompositionRoot(print);
}
public final static String pdfgenerationDescription =
"<h1>Generating a Printable PDF</h1>" +
"<p>You can generate a PDF file dynamically using a <b>StreamResource</b>. The following example does it using the Apache FOP.</p>";
// BEGIN-EXAMPLE: advanced.printing.pdfgeneration
/** Generates the PDF dynamically when requested by HTTP. */
class MyPdfSource implements StreamSource {
private static final long serialVersionUID = 6580720404794033932L;
String name; // A trivial content data model
/** Constructor gets a content data model as parameter */
public MyPdfSource(String name) {
this.name = name;
}
@Override
public InputStream getStream() {
// Generate the FO content. You could use the Java DOM API
// here as well and pass the DOM to the transformer.
String fo = "<?xml version='1.0' encoding='ISO-8859-1'?>\n"+
"<fo:root xmlns:fo='http://www.w3.org/1999/XSL/Format'>\n"+
"<fo:layout-master-set>"+
" <fo:simple-page-master master-name='A4' margin='2cm'>"+
" <fo:region-body />"+
" </fo:simple-page-master>"+
"</fo:layout-master-set>"+
"<fo:page-sequence master-reference='A4'>"+
" <fo:flow flow-name='xsl-region-body'>"+
" <fo:block text-align='center'>"+
"Hello There, "+ name + "!</fo:block>"+
" </fo:flow>"+
"</fo:page-sequence>"+
"</fo:root>\n";
ByteArrayInputStream foStream =
new ByteArrayInputStream(fo.getBytes());
// Basic FOP configuration. You could create this object
// just once and keep it.
FopFactory fopFactory = FopFactory.newInstance();
fopFactory.setStrictValidation(false); // For an example
// Configuration for this PDF document - mainly metadata
FOUserAgent userAgent = fopFactory.newFOUserAgent();
userAgent.setProducer("My Vaadin Application");
userAgent.setCreator("Me, Myself and I");
userAgent.setAuthor("Da Author");
userAgent.setCreationDate(new Date());
userAgent.setTitle("Hello to " + name);
userAgent.setKeywords("PDF Vaadin example");
userAgent.setTargetResolution(300); // DPI
// Transform to PDF
ByteArrayOutputStream fopOut = new ByteArrayOutputStream();
try {
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF,
userAgent, fopOut);
TransformerFactory factory =
TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
Source src = new
javax.xml.transform.stream.StreamSource(foStream);
Result res = new SAXResult(fop.getDefaultHandler());
transformer.transform(src, res);
fopOut.close();
return new ByteArrayInputStream(fopOut.toByteArray());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
void pdfgeneration(VerticalLayout layout) {
// A user interface for a data model from which
// the PDF is generated.
final TextField name = new TextField("Name");
name.setValue("Slartibartfast");
Button print = new Button("Open PDF");
print.addListener(new ClickListener() {
private static final long serialVersionUID = 1269425538593656695L;
@Override
public void buttonClick(ClickEvent event) {
// Create the PDF source and pass the data model to it
StreamSource source =
new MyPdfSource((String) name.getValue());
// Create the stream resource and give it a file name
String filename = "pdf_printing_example.pdf";
StreamResource resource = new StreamResource(source,
filename, getApplication());
// These settings are not usually necessary. MIME type
// is detected automatically from the file name, but
// setting it explicitly may be necessary if the file
// suffix is not ".pdf".
resource.setMIMEType("application/pdf");
resource.getStream().setParameter("Content-Disposition",
"attachment; filename="+filename);
// Open it in this window - this will either launch
// PDF viewer or let the user download the file. Could
// use "_blank" target to open in another window, but
// may not be necessary.
getWindow().open(resource);
}
});
layout.addComponent(name);
layout.addComponent(print);
}
// END-EXAMPLE: advanced.printing.pdfgeneration
}
package com.vaadin.book.examples.advanced；
导入java.io.ByteArrayInputStream；
导入java.io.ByteArrayOutputStream；
导入java.io.InputStream；
导入java.util.Date；
导入javax.xml.transform.Result；
导入javax.xml.transform.Source；
导入javax.xml.transform.Transformer；
导入javax.xml.transform.TransformerFactory；
导入javax.xml.transform.sax.SAXResult；
导入org.apache.fop.apps.FOUserAgent；
导入org.apache.fop.apps.fop；
导入org.apache.fop.apps.FopFactory；
导入org.apache.fop.apps.MimeConstants；
导入com.vaadin.book.examples.BookExampleBundle；
导入com.vaadin.terminal.ExternalResource；
导入com.vaadin.terminal.StreamResource；
导入com.vaadin.terminal.StreamResource.StreamSource；
导入com.vaadin.ui.Button；
导入com.vaadin.ui.Button.ClickEvent；
导入com.vaadin.ui.Button.ClickListener；
导入com.vaadin.ui.CustomComponent；
导入com.vaadin.ui.Label；
导入com.vaadin.ui.TextField；
导入com.vaadin.ui.VerticalLayout；
导入com.vaadin.ui.Window；
公共类PrintingExample扩展CustomComponent实现BookExampleBundle{
私有静态最终长serialVersionUID=97529549237L；
公共void init（字符串上下文）{
VerticalLayout布局=新建VerticalLayout（）；
如果（“this”.equals（上下文））
打印此页（）；
else if（“打开”。等于（上下文））
printOpenedPage（）；
else if（“非阻塞”。等于（上下文））
打印非阻塞页面（）；
else if（“pdfgeneration”.equals（上下文））
PDF发电（布局）；
其他的
setCompositionRoot（新标签（“无效上下文”）；
如果（getCompositionRoot（）==null）
setCompositionRoot（布局）；
}
作废打印此页（）{
//BEGIN-EXAMPLE:advanced.printing.this
最终按钮打印=新按钮（“打印此页面”）；
print.addListener（新建ClickListener（）{
私有静态最终长serialVersionUID=15335453452L；
公共作废按钮单击（单击事件）{
print.getWindow（）.executeJavaScript（“print（）；”）；
}
});
//结束示例：advanced.printing.this
setCompositionRoot（打印）；
}
作废打印打开页（）{
//BEGIN-EXAMPLE:advanced.printing.open
//打开打印机友好页面的按钮。
按钮打印=新按钮（“点击打印”）；
print.addListener（新建按钮。单击Listener（））{
私有静态最终长serialVersionUID=6588417468637527327L；
公共作废按钮单击（单击事件）{
//创建包含要打印内容的窗口
窗口=新窗口（“打印窗口”）；
//有一些内容要打印吗
window.addComponent（新标签(
“这里有一些动态内容\n”+
“这将被打印到打印机上。”，
Label.CONTENT（XHTML））；
//将打印窗口添加为新的应用程序级别
//窗口
getApplication（）.addWindow（窗口）；
//将其作为弹出窗口打开，不带任何装饰
getWindow（）.open（新的外部资源（window.getURL（）），
“_blank”，500，200，//宽度和高度
窗口。边框（无）；//无装饰
//窗口打开时自动打印。
//此调用将被阻止，直到打印对话框退出！
executeJavaScript（“print（）；”）；
//打印后自动关闭窗口
executeJavaScript（“self.close（）；”）；
}
});
//结束示例：advanced.printing.open
setCompositionRoot（打印）；
}
//TODO:这实际上也会阻塞。
无效打印非阻止页（）{
//打开打印机友好页面的按钮。
最终按钮打印=新按钮（“点击打印”）；
print.addListener（新建按钮。单击Listener（））{
私有静态最终长serialVersionUID=349852897523897L；
公共作废按钮单击（单击事件）{
//要打印的内容。必须双引号换行。
String content=“要打印的内容\\n”+
“重要的东西\\n”；
//用于打印和关闭窗口的代码
内容+=“”+
“打印（）；”+
“关闭（）；”+
"";
//打开打印窗口
String js=“popup=window.open（“”，'mywindow'，'status=1，width=350，height=150'）；\n”+
“popup.document.write（“+content+”）；\n”；
print.getWindow（）.executeJavaScript（js）；
package com.vaadin.book.examples.advanced;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Date;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
import com.vaadin.book.examples.BookExampleBundle;
import com.vaadin.terminal.ExternalResource;
import com.vaadin.terminal.StreamResource;
import com.vaadin.terminal.StreamResource.StreamSource;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Button.ClickListener;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
public class PrintingExample extends CustomComponent implements BookExampleBundle {
private static final long serialVersionUID = 97529549237L;
public void init(String context) {
VerticalLayout layout = new VerticalLayout();
if ("this".equals(context))
printThisPage();
else if ("open".equals(context))
printOpenedPage();
else if ("nonblocking".equals(context))
printNonblockingPage();
else if ("pdfgeneration".equals(context))
pdfgeneration(layout);
else
setCompositionRoot(new Label("Invalid Context"));
if (getCompositionRoot() == null)
setCompositionRoot(layout);
}
void printThisPage () {
// BEGIN-EXAMPLE: advanced.printing.this
final Button print = new Button("Print This Page");
print.addListener(new ClickListener() {
private static final long serialVersionUID = 15335453452L;
public void buttonClick(ClickEvent event) {
print.getWindow().executeJavaScript("print();");
}
});
// END-EXAMPLE: advanced.printing.this
setCompositionRoot(print);
}
void printOpenedPage () {
// BEGIN-EXAMPLE: advanced.printing.open
// A button to open the printer-friendly page.
Button print = new Button("Click to Print");
print.addListener(new Button.ClickListener() {
private static final long serialVersionUID = 6588417468637527327L;
public void buttonClick(ClickEvent event) {
// Create a window that contains what you want to print
Window window = new Window("Window to Print");
// Have some content to print
window.addComponent(new Label(
"<h1>Here's some dynamic content</h1>\n" +
"<p>This is to be printed to the printer.</p>",
Label.CONTENT_XHTML));
// Add the printing window as a new application-level
// window
getApplication().addWindow(window);
// Open it as a popup window with no decorations
getWindow().open(new ExternalResource(window.getURL()),
"_blank", 500, 200, // Width and height
Window.BORDER_NONE); // No decorations
// Print automatically when the window opens.
// This call will block until the print dialog exits!
window.executeJavaScript("print();");
// Close the window automatically after printing
window.executeJavaScript("self.close();");
}
});
// END-EXAMPLE: advanced.printing.open
setCompositionRoot(print);
}
// TODO: This actually blocks also.
void printNonblockingPage () {
// A button to open the printer-friendly page.
final Button print = new Button("Click to Print");
print.addListener(new Button.ClickListener() {
private static final long serialVersionUID = 349852897523897L;
public void buttonClick(ClickEvent event) {
// Content to be printed. Must double-quote newlines.
String content = "<h1>Stuff to Print</h1>\\n" +
"<p>Important stuff</p>\\n";
// The code to print and close the window
content += "<SCRIPT language=\"JavaScript\">" +
" print();" +
" close();" +
"</SCRIPT>";
// Open the print window
String js = "popup = window.open('', 'mywindow','status=1,width=350,height=150');\n" +
"popup.document.write('"+content+"');\n";
print.getWindow().executeJavaScript(js);
}
});
setCompositionRoot(print);
}
public final static String pdfgenerationDescription =
"<h1>Generating a Printable PDF</h1>" +
"<p>You can generate a PDF file dynamically using a <b>StreamResource</b>. The following example does it using the Apache FOP.</p>";
// BEGIN-EXAMPLE: advanced.printing.pdfgeneration
/** Generates the PDF dynamically when requested by HTTP. */
class MyPdfSource implements StreamSource {
private static final long serialVersionUID = 6580720404794033932L;
String name; // A trivial content data model
/** Constructor gets a content data model as parameter */
public MyPdfSource(String name) {
this.name = name;
}
@Override
public InputStream getStream() {
// Generate the FO content. You could use the Java DOM API
// here as well and pass the DOM to the transformer.
String fo = "<?xml version='1.0' encoding='ISO-8859-1'?>\n"+
"<fo:root xmlns:fo='http://www.w3.org/1999/XSL/Format'>\n"+
"<fo:layout-master-set>"+
" <fo:simple-page-master master-name='A4' margin='2cm'>"+
" <fo:region-body />"+
" </fo:simple-page-master>"+
"</fo:layout-master-set>"+
"<fo:page-sequence master-reference='A4'>"+
" <fo:flow flow-name='xsl-region-body'>"+
" <fo:block text-align='center'>"+
"Hello There, "+ name + "!</fo:block>"+
" </fo:flow>"+
"</fo:page-sequence>"+
"</fo:root>\n";
ByteArrayInputStream foStream =
new ByteArrayInputStream(fo.getBytes());
// Basic FOP configuration. You could create this object
// just once and keep it.
FopFactory fopFactory = FopFactory.newInstance();
fopFactory.setStrictValidation(false); // For an example
// Configuration for this PDF document - mainly metadata
FOUserAgent userAgent = fopFactory.newFOUserAgent();
userAgent.setProducer("My Vaadin Application");
userAgent.setCreator("Me, Myself and I");
userAgent.setAuthor("Da Author");
userAgent.setCreationDate(new Date());
userAgent.setTitle("Hello to " + name);
userAgent.setKeywords("PDF Vaadin example");
userAgent.setTargetResolution(300); // DPI
// Transform to PDF
ByteArrayOutputStream fopOut = new ByteArrayOutputStream();
try {
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF,
userAgent, fopOut);
TransformerFactory factory =
TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
Source src = new
javax.xml.transform.stream.StreamSource(foStream);
Result res = new SAXResult(fop.getDefaultHandler());
transformer.transform(src, res);
fopOut.close();
return new ByteArrayInputStream(fopOut.toByteArray());
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
void pdfgeneration(VerticalLayout layout) {
// A user interface for a data model from which
// the PDF is generated.
final TextField name = new TextField("Name");
name.setValue("Slartibartfast");
Button print = new Button("Open PDF");
print.addListener(new ClickListener() {
private static final long serialVersionUID = 1269425538593656695L;
@Override
public void buttonClick(ClickEvent event) {
// Create the PDF source and pass the data model to it
StreamSource source =
new MyPdfSource((String) name.getValue());
// Create the stream resource and give it a file name
String filename = "pdf_printing_example.pdf";
StreamResource resource = new StreamResource(source,
filename, getApplication());
// These settings are not usually necessary. MIME type
// is detected automatically from the file name, but
// setting it explicitly may be necessary if the file
// suffix is not ".pdf".
resource.setMIMEType("application/pdf");
resource.getStream().setParameter("Content-Disposition",
"attachment; filename="+filename);
// Open it in this window - this will either launch
// PDF viewer or let the user download the file. Could
// use "_blank" target to open in another window, but
// may not be necessary.
getWindow().open(resource);
}
});
layout.addComponent(name);
layout.addComponent(print);
}
// END-EXAMPLE: advanced.printing.pdfgeneration
}
Window window = new Window();
window.setWidth("90%");
window.setHeight("90%");
BrowserFrame e = new BrowserFrame("PDF File", new ExternalResource("http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_open_parameters.pdf"));
e.setWidth("100%");
e.setHeight("100%");
window.setContent(e);
window.center();
window.setModal(true);
UI.getCurrent().addWindow(window);