Use the Apache XML project FOP to generate a PDF file (on)
I. Foreword: In the project, I have to save the document into a PDF file. I have found a long time online, I finally discovered that Apache's FOP project has this function.
Second, suitable for the reader object: I want to learn to learn!
Third, the introduction: FOP is called Formatting Objects Processor, translated into formatted object processors, simple points, it is a print format drive, which can easily generate corresponding formatted files. FOP now supported formatted files include PDF, PCL, PS, SVG, XML, Print, AWT, MIF AND TXT. Most mainly useful PDF files we are familiar with. The following uses a few examples of how FOP do it.
Fourth, content:
1. Install: From http://xml.apache.org/dist/fop/, download a file package FOP-0.20.5rc-bin.tar.gz file package decompression, generate a folder assumption to F: / FOP
Directory structure
F: / FOP directory
04: 00P
12/19/2002 04: 00p
12/11/2002 12: 26A 46, 124 CHANGES
12/11/2002 12: 26A 679 FOP.BAT
12/11/2002 12: 26A 2,446 FOP.SH
12/11/2002 12: 26A 2,675 license
12/11/2002 12: 26A 1,248 Readme
12/11/2002 12: 26A 597 ReleaseNotes.html
12/11/2002 12: 26A 884 Status
12/19/2002 04: 00p
12/19/2002 04: 00p
12/19/2002 04: 00p
12/19/2002 04: 00p
12/19/2002 04: 00p
12/11/2002 12: 26A 14, 899 BUGS.HTML
Where the lib directory consists of several needs:
(A) XML's API: XML-Apis.jar
(B) Apache's XML parser: Xercesimpl-2.2.1.jar
(c) Apache's XSLT processor: Xalan-2.4.1.jar
(d) Apache's SVG library file that makes PDF colorful pictures: Batik.jar
(e) Avalon Framework library file: avalon-framework-cvs-20020806.jar
Add them to classpath;
Add: f: / FOP in the system's PATH variable
A simple test:
Mr. became a FO file:
Open the DOS window: Type
FOP HelloWorld.fo HelloWorld.pdf
If there is no problem with the installation configuration, you will see a helloWorld.pdf file in the current directory.
2. Let's take a look at how to use the FOP library resources in the Java program to generate a PDF file, which will encounter several situations: (1) XLS-foàpdf; (2) xmlàxsl-foàpdf; (3) javaàxmlàxsl-foàpdf
(1) XLS-foàpdf:
XSL is a standard XML document for W3C, which includes two types: XSLT and XSLFO, and XSLFO EXTENSIBLE STYLESHEET LANGUAGE FORMATTING OBJECTS, which is also an extension style language file with formatted objects. A function using the FOP can generate a PDF file directly. The processing flow is as follows:
XLS-FO
FOP
// Example: Examplefo2pdf.java
Import java.io.file;
Import java.io.ioException;
Import Java.io.InputStream;
Import java.io.outputstream;
// SAX
Import org.xml.sax.inputsource;
// Avalon
Import org.apache.avalon.framework.exceptionUtil;
Import org.apache.avalon.framework.logger.logger;
Import org.apache.avaalon.framework.logger.consolelogger;
// FOP
Import org.apache.fop.apps.driver;
Import org.apache.fop.apps.fopexception;
Import org.apache.fop.Messaging.MessageHandler;
/ **
* This class demonstrates the conversion of an fo file to pdf using fop. * /
Public class examplefo2pdf {
Public Void Convertfo2PDF (File Fo, File PDF) Throws oException, FOPEXCEPTION {
// Construct Driver
Driver driver = new driver ();
// setup logger
Logger logger = new consolelogger (consoleLogger.Level_INFO);
Driver.setLogger (Logger);
MessageHandler.SetScreenLogger (Logger);
// setup renderer (Output Format)
Driver.setrenderer (driver.render_pdf);
// setup OUTPUT
OutputStream out = new java.io.fileoutputstream (PDF);
Try {
Driver.setOutputStream (OUT);
// setup input
InputStream in = new java.io.fileinputStream (fo);
Try {
Driver.setInputSource (New InputSource (in));
// Process Fo
Driver.run ();
} finally {
In.Close ();
}
} finally {
Out.close ();
}
}
Public static void main (String [] args) {
Try {
System.out.println ("FOP EXAMPLEFO2PDF / N");
System.out.println ("preplay ...");
// setup Directories
FILE Basedir = New File (".");
// setup Input and Output Files
File Fofile = New File (Basedir, "HelloWorld.fo");
File pdffile = new file (basedir, "resultfo2pdf.pdf");
System.out.println ("INPUT: XSL-FO (" FOFILE ")")
System.out.println ("OUTPUT: PDF (" PDFFILE ")")
System.out.println ();
System.out.println ("Transforming ...");
Examplefo2pdf app = new examplefo2pdf ();
App.convertfo2PDF (FOFILE, PDFFILE);
System.out.println ("Success!");
} catch (exception e) {
System.rr.println (ExceptionUtil.PrintStackTrace (e));
System.exit (-1);
}
}
}
Compile the above program to convert the XMLFO file helloworld.fo to Resultfo2PDF.PDF
Reference: http://xml.apache.org/
Author E-mail: jasea@sina.com
