java编程将HTML文件转换成PDF文件
网上有好几种方法可以将将HTML文件转换成PDF文件但是有些对HTML文件格式要求比较严格,稍微错了一些就不能生成我们所要的PDF文件,这里我推荐一个
PD4ML,它可以解决HTML文件格式不正确的问题,可以生成一个比较好的PDF文件,其处理速度快,而且对CSS文件兼容的非常好。下面是最基本的
PD4ML编程:package samples; import java.awt.Insets; import java.io.File; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.security.InvalidParameterException; import org.zefer.pd4ml.PD4Constants; import org.zefer.pd4ml.PD4ML; public class GettingStarted1 { protected int topValue = 10; protected int leftValue = 20; protected int rightValue = 10; protected int bottomValue = 10; protected int userSpaceWidth = 1300; public static void main(String[] args) { try { GettingStarted1 jt = new GettingStarted1(); jt.doConversion("http://pd4ml.com/sample.htm", "c:/pd4ml.pdf"); } catch (Exception e) { e.printStackTrace(); } } public void doConversion( String url, String outputPath ) throws InvalidParameterException, MalformedURLException, IOException { File output = new File(outputPath); java.io.FileOutputStream fos = new java.io.FileOutputStream(output); PD4ML pd4ml = new PD4ML(); pd4ml.setHtmlWidth(userSpaceWidth); // set frame width of "virtual web browser" // choose target paper format and "rotate" it to landscape orientation pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4)); // define PDF page margins pd4ml.setPageInsetsMM(new Insets(topValue, leftValue, bottomValue, rightValue)); // source HTML document also may have margins, could be suppressed this way // (PD4ML *Pro* feature): pd4ml.addStyle("BODY {margin: 0}", true); // If built-in basic PDF fonts are not sufficient or // if you need to output non-Latin texts, // TTF embedding feature should help (PD4ML *Pro*) pd4ml.useTTF("c:/windows/fonts", true); pd4ml.render(new URL(url), fos); // actual document conversion from URL to file fos.close(); System.out.println( outputPath + "\ndone." ); } }
The following Java class slightly changes the above example. Now it pre-reads source HTML to a string and passes it to render()method wrapped to StringReader. First it writes PDF bytes to ByteArrayOutputStream, which makes possible to measure size of the resulting document.
A disadvantage of the method is a bigger RAM utilization.
package samples; import java.awt.Insets;; import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.StringReader; import java.net.MalformedURLException; import java.net.URL; import java.security.InvalidParameterException; import org.zefer.pd4ml.PD4Constants; import org.zefer.pd4ml.PD4ML; public class GettingStarted2 { protected int topValue = 10; protected int leftValue = 20; protected int rightValue = 10; protected int bottomValue = 10; protected int userSpaceWidth = 1300; public static void main(String[] args) { try { GettingStarted2 jt = new GettingStarted2(); String html = readFile("c:/sample.htm", "UTF-8"); jt.doConversion2(html, "c:/pd4ml.pdf"); } catch (Exception e) { e.printStackTrace(); } } public void doConversion2( String htmlDocument, String outputPath ) throws InvalidParameterException, MalformedURLException, IOException { PD4ML pd4ml = new PD4ML(); pd4ml.setHtmlWidth(userSpaceWidth); // set frame width of "virtual web browser" // choose target paper format pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4)); // define PDF page margins pd4ml.setPageInsetsMM(new Insets(topValue, leftValue, bottomValue, rightValue)); // source HTML document also may have margins, could be suppressed this way // (PD4ML *Pro* feature): pd4ml.addStyle("BODY {margin: 0}", true); // If built-in basic PDF fonts are not sufficient or // if you need to output non-Latin texts, TTF embedding feature should help // (PD4ML *Pro*) pd4ml.useTTF("c:/windows/fonts", true); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // actual document conversion from HTML string to byte array pd4ml.render(new StringReader(htmlDocument), baos); // if the HTML has relative references to images etc, // use render() method with baseDirectory parameter instead baos.close(); System.out.println( "resulting PDF size: " + baos.size() + " bytes" ); // in Web scenarios it is a good idea to send the size with // "Content-length" HTTP header File output = new File(outputPath); java.io.FileOutputStream fos = new java.io.FileOutputStream(output); fos.write( baos.toByteArray() ); fos.close(); System.out.println( outputPath + "\ndone." ); } private final static String readFile( String path, String encoding ) throws IOException { File f = new File( path ); FileInputStream is = new FileInputStream(f); BufferedInputStream bis = new BufferedInputStream(is); ByteArrayOutputStream fos = new ByteArrayOutputStream(); byte buffer[] = new byte[2048]; int read; do { read = is.read(buffer, 0, buffer.length); if (read > 0) { fos.write(buffer, 0, read); } } while (read > -1); fos.close(); bis.close(); is.close(); return fos.toString(encoding); } }http://blog.csdn.net/w397090770/article/details/7753166
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