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：

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 易做图 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 易做图 format
        pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4));

        // define PDF page margins
        pd4ml.setPageInsetsMM(new Insets(topValue, leftValue, bottomValue, rightValue));

补充：软件开发 , Java ,