ItextPdf 数字签名,HTML转PDF功能

  哼哼,完成这篇,这周的任务算是完成了,上篇文章主要生成了自己的证书与和密码,这篇主要实现数字签名及HTML转成PDF功能。

  今天下午把功能基本完成了,常帅走过来说,你知道签名的解签的原理吗?尼玛...不清楚,cer,crt,pfx,csr..一大堆名称,看过转身就忘记了。。

  在弄功能时有几个细节,调试了半天,第一个是将不标准的HTML转成标准的HTML格式(就是必须是有始有终),不然itextpdf转不了,报错。 第二个是印章定位的问题,最后经过一遍遍调试,终于能将图在指定的位置显示了。

  主要功能如下

     1,将HTML转成PDF

     2,对此PDF进行签名

     3,打印签名。

   一,HContent.java 常量类,定义图片资源的位置   

package com.wowoyoo.helper;
/**
 * @author hubs 
 * @version 创建时间:2017年3月22日 下午3:34:56
 * 类说明
 */
public class Content {
	
	public static String BASE 				  					= "/home/hubs/桌面/ssl/ok/";	//文件存放路径
	/** The resulting PDF */
	public static String PDF_NEW		  					= BASE + "/test1.pdf"; // 创建的PDF
	/** The resulting PDF */
	public static String PDF_SIGNED 		  				= BASE + "/signature_1.pdf"; // 签名的文件
	/** Info after verification of a signed PDF */
	public static String PDF_VERIFICATION		= BASE + "verify.txt"; // 签证的信息,如果已更改,则值为空

	public static final String PFX_PATH 				= BASE + "client.pfx";// 证书,包含密钥

	public static final String PFX_PASS 				= "xxxxx"; // 这是签名的密码

	public static final String STAMP_PATH 		= BASE + "test.gif"; // 签名的图
	public static final String LOGO_PATH 			= BASE + "logo.png"; // 签名的图

	public static final String CER_PATH 				= BASE + "client.crt"; // 解答的证书,公钥

	public static byte[] OPEN_PASSWORD 		   = "hello".getBytes(); // 密码

	public static final String HTML_PATH		   = BASE + "test.html";

	public static final String WORD_PATH		   = BASE + "word.doc";

}

    二,HTML转PDF类


package com.wowoyoo.helper;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;

import org.jsoup.Jsoup;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.tool.xml.XMLWorkerHelper;

/**
 * @author hubs
 * @version 创建时间:2017年3月22日 下午3:29:21 
 *  类说明"HTML转PDF
 */
public class HtmlToPdf {
	public static void createPdf(String HTML,String outFileName) throws IOException,DocumentException {

		Document document = new Document(PageSize.A4);
		PdfWriter pdfWriter = PdfWriter.getInstance(document,new FileOutputStream(outFileName));
		document.open();
		document.addAuthor("蜗蜗游旅行网");
		document.addTitle("蜗蜗游旅行网电子合同");
		document.addCreator("蜗蜗游旅行网");
		document.addHeader("wowoyoo.com", "蜗蜗游");
		document.addKeywords("蜗蜗游,电子合同 ");
		document.addSubject("蜗蜗游旅行网电子合同");

		// 标准化HTML代码
		org.jsoup.nodes.Document _doc = Jsoup.parse(new File(HTML), "UTF-8");
		_doc.outputSettings().syntax(org.jsoup.nodes.Document.OutputSettings.Syntax.xml);

		String _html = _doc.html();
		//HTML转PDF
		XMLWorkerHelper.getInstance().parseXHtml(pdfWriter, document,new ByteArrayInputStream(_html.getBytes()),Charset.forName("UTF-8"), new AsianFontProvider());
		document.close();
	}
	
}


    三,中文汉字类,主要是使用了itext-asian包


package com.wowoyoo.helper;

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Font;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.tool.xml.XMLWorkerFontProvider;

/**
 * @author hubs
 * @version 创建时间:2017年3月21日 下午4:18:49 类说明
 */
public class AsianFontProvider extends XMLWorkerFontProvider {
	public Font getFont(final String fontname, final String encoding,
			final boolean embedded, final float size, final int style,
			final BaseColor color) {
		BaseFont bf = null;
		try {
			bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",	BaseFont.NOT_EMBEDDED);
		} catch (Exception e) {
			e.printStackTrace();
		}
		Font font = new Font(bf, size, style, color);
		font.setColor(color);
		return font;
	}
}

    四,签名类


    

package com.wowoyoo.helper;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.PdfAnnotation;
import com.itextpdf.text.pdf.PdfAppearance;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.security.BouncyCastleDigest;
import com.itextpdf.text.pdf.security.CertificateInfo;
import com.itextpdf.text.pdf.security.CertificateVerification;
import com.itextpdf.text.pdf.security.ExternalDigest;
import com.itextpdf.text.pdf.security.ExternalSignature;
import com.itextpdf.text.pdf.security.MakeSignature;
import com.itextpdf.text.pdf.security.MakeSignature.CryptoStandard;
import com.itextpdf.text.pdf.security.PdfPKCS7;
import com.itextpdf.text.pdf.security.PrivateKeySignature;
import com.itextpdf.text.pdf.security.VerificationException;

/**
 * @author hubs 
 * @version 创建时间:2017年3月22日 下午3:39:42
 * 类说明
 */
public class Sign {

	//对PDF进行签名 
	public static  void signPdf(String src, String dest) throws Exception {
		KeyStore ks 			= KeyStore.getInstance("pkcs12", "BC");
		//证书与证书密码(不要问我是什么意思,我的直接copy网上的....)
		ks.load(new FileInputStream(Content.PFX_PATH),Content.PFX_PASS.toCharArray());
		String alias 				=	 (String) ks.aliases().nextElement();
		PrivateKey pk		    = (PrivateKey) ks.getKey(alias, Content.PFX_PASS.toCharArray());
		Certificate[] chain  = ks.getCertificateChain(alias);
		
		//读取需要签名的PDF源文件
		PdfReader reader 			= new PdfReader(src);
		//写入目标文件
		FileOutputStream os  = new FileOutputStream(dest);
		PdfStamper stamper  = PdfStamper.createSignature(reader, os, '\0');
		
		// 加密,只充许打印
		stamper.setEncryption(Content.OPEN_PASSWORD, null, PdfWriter.ALLOW_PRINTING,PdfWriter.ENCRYPTION_AES_128| PdfWriter.DO_NOT_ENCRYPT_METADATA);

		int qtyPages = reader.getNumberOfPages();
		//这个是在每一页的印章(除最后一页)
		Image _image = Image.getInstance(Content.LOGO_PATH);

		//这个宽度是图片定位用的
		float _width 		= PageSize.A4.getWidth() - _image.getScaledWidth();
		
		//设置为A4纸大小
		Rectangle _rect 	= PageSize.A4;
		Rectangle _cell 	= new Rectangle(_rect);
		
		//除了最后一页,其他每页都盖章
		for (int i = 1; i < qtyPages; i++) {
			PdfAnnotation stp 	= PdfAnnotation.createStamp(stamper.getWriter(),_cell, "蜗蜗游旅行网", "wowoyoo.com");// 每一页加标签
			PdfAppearance tp 	= PdfAppearance.createAppearance(stamper.getWriter(), _rect.getWidth(), _rect.getHeight());
			_image.setAbsolutePosition(_width - 50, 50);// X:坐标,Y:右下角坐标
			tp.addImage(_image, true);
			stp.setAppearance(PdfAnnotation.APPEARANCE_NORMAL, tp);
			stamper.addAnnotation(stp, i);
		}

		// 最后一个界面加印章
		Image _last_image 		= Image.getInstance(Content.STAMP_PATH);
		PdfAnnotation stp 		= PdfAnnotation.createStamp(stamper.getWriter(),_cell, "蜗蜗游旅行网", "wowoyoo.com");// 每一页加标签
		PdfAppearance tp = PdfAppearance.createAppearance(stamper.getWriter(),_rect.getWidth(), _rect.getHeight());
		_last_image.setAbsolutePosition(_width - 150, 200);// X:坐标,Y:右下角坐标,这里自己调位置
		tp.addImage(_last_image, true);
		stp.setAppearance(PdfAnnotation.APPEARANCE_NORMAL, tp);
		stamper.addAnnotation(stp, qtyPages);

		
		PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
		ExternalSignature es = new PrivateKeySignature(pk, "SHA-256", "BC");
		ExternalDigest digest = new BouncyCastleDigest();
		MakeSignature.signDetached(appearance, digest, es, chain, null, null,null, 0, CryptoStandard.CMS);
	}

	//签证签名(这里暂时只打印出信息,不作判断)
	/**
	 * 打印结果如下:
	 * Signature name: Signature1
	 * Signature covers whole document: true
	 *Document revision: 1 of 1
	 *Subject: {E=[273579540@qq.com], ST=[guanxi], C=[zh], L=[guilin], OU=[wowoyoo], O=[wowoyoo], CN=[wowoyoo]}
	 * Revision modified: false
	 * Certificates verified against the KeyStore
	 * @throws Exception
	 */
	public static  void verifySignatures() throws Exception {
		KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
		ks.load(null, null);

		Certificate cert1 = getPublicCertificate();
		ks.setCertificateEntry("cacert", cert1);

		PrintWriter out 						= new PrintWriter(new FileOutputStream(Content.PDF_VERIFICATION));
		PdfReader reader 					= new PdfReader(Content.PDF_SIGNED, Content.OPEN_PASSWORD);//这里要加上签名的密码
		AcroFields af 							= reader.getAcroFields();
		ArrayListnames 	= af.getSignatureNames();
		for (String name : names) {
			out.println("Signature name: " + name);
			out.println("Signature covers whole document: "+ af.signatureCoversWholeDocument(name));
			out.println("Document revision: " + af.getRevision(name) + " of "+ af.getTotalRevisions());
			PdfPKCS7 pk = af.verifySignature(name);
			Calendar cal = pk.getSignDate();
			Certificate[] pkc = pk.getCertificates();
			out.println("Subject: "+ CertificateInfo.getSubjectFields(pk.getSigningCertificate()));
			out.println("Revision modified: " + !pk.verify());
			Listerrors = CertificateVerification.verifyCertificates(pkc, ks, null, cal);
			if (errors.size() == 0)
				out.println("Certificates verified against the KeyStore");
			else
				out.println(errors);
		}
		out.flush();
		out.close();
	}

	//公钥证书
	private static  Certificate getPublicCertificate() throws Exception {
		FileInputStream is 			= new FileInputStream(Content.CER_PATH);
		CertificateFactory cf 		= CertificateFactory.getInstance("X.509");
		X509Certificate cert 			= (X509Certificate) cf.generateCertificate(is);
		return cert;
	}
}


    五,直接调用


package com.wowoyoo.main;

import java.security.Security;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import com.wowoyoo.helper.Content;
import com.wowoyoo.helper.HtmlToPdf;
import com.wowoyoo.helper.Sign;

/**
 * @author hubs
 * @version 创建时间:2017年3月20日 下午6:03:10 类说明
 */
public class Main {

	public static void main(String[] args) throws Exception {
		Security.addProvider(new BouncyCastleProvider());

		HtmlToPdf.createPdf(Content.HTML_PATH, Content.PDF_NEW);
		Sign.signPdf(Content.PDF_NEW, Content.PDF_SIGNED);
		Sign.verifySignatures();
	}

}

        

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