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." );
}
}
下面的Java类稍微改变了上面的示例。现在它将源HTML预先读入一个字符串,并将其传递给包装到StringReader的render()方法。首先,它将PDF字节写入ByteArrayOutputStream,这使得测量结果文档的大小成为可能.该方法的一个缺点是RAM利用率较大。
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);
}
}
涉及格式转换用到的包,可以通过以下网址进行下载: