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：

Java代码
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.h
tm", "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 torender()method wrapped toStringReader. First it writes PDF bytes toByteArrayOutputStream, which makes possible to measure size of the resulting document.
A disadvantage of the method is a bigger RAM utilization.
Java代码
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); 
    } 
}