java編程將HTML文件轉換成PDF文件

網上有好幾種方法可以將將HTML文件轉換成PDF文件但是有些對HTML文件格式要求比較嚴格，稍微錯了一些就不能生成我們所要的PDF文件，這里我推薦一個

PD4ML，它可以解決HTML文件格式不正確的問題，可以生成一個比較好的PDF文件，其處理速度快，而且對CSS文件兼容的非常好。下面是最基本的

PD4ML編程：

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." );  
    }  
}  </pre></span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">The following Java class slightly changes the above example. Now it pre-reads source HTML to a string and passes it to </span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">render()</span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">method wrapped to </span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">StringReader</span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">. First it writes PDF bytes to </span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">ByteArrayOutputStream</span><span style="text-align:justify;font-family:tahoma,sansserif;font-size:13px;">, which makes possible to measure size of the resulting document.</span> </h3>

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