java pdf 实现电子签章

package com.taoyuan.pdf.sign.itext;

import java.io.InputStream;
import java.io.OutputStream;
import java.security.PrivateKey;
import java.security.cert.Certificate;

import com.itextpdf.text.pdf.security.MakeSignature.CryptoStandard;

public interface PdfSign {
	 void sign（InputStream src  //需要签章的pdf文件路径
             OutputStream dest  // 签完章的pdf文件路径
             Certificate[] chain //证书链
             PrivateKey pk //签名私钥
             String digestAlgorithm  //摘要算法名称，例如SHA-1
             String provider  // 密钥算法提供者，可以为null
             CryptoStandard subfilter //数字签名格式，itext有2种
             String reason  //签名的原因，显示在pdf签名属性中，随便填
             String locationString chapterPath）; //签名的地点，显示在pdf签名属性中，随便填
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-10-07 19:18  pdfsign
     文件         730  2017-10-07 19:18  pdfsign.classpath
     文件         383  2017-10-07 19:18  pdfsign.project
     目录           0  2017-10-07 19:18  pdfsign.settings
     文件         598  2017-10-07 19:18  pdfsign.settingsorg.eclipse.jdt.core.prefs
     目录           0  2017-10-07 19:18  pdfsignin
     文件       61079  2017-10-07 19:18  pdfsigninchapter.png
     目录           0  2017-10-07 19:18  pdfsignincom
     目录           0  2017-10-07 19:18  pdfsignincom aoyuan
     目录           0  2017-10-07 19:18  pdfsignincom aoyuanpdf
     目录           0  2017-10-07 19:18  pdfsignincom aoyuanpdfsign
     目录           0  2017-10-07 19:18  pdfsignincom aoyuanpdfsignitext
     文件         559  2017-10-07 19:18  pdfsignincom aoyuanpdfsignitextPdfSign.class
     文件       13670  2017-10-07 19:18  pdfsignincom aoyuanpdfsignitextPdfSignBox.class
     文件        4521  2017-10-07 19:18  pdfsignincom aoyuanpdfsignitextPdfSignItext.class
     目录           0  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfbox
     文件        1580  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxCMSProcessableInputStream.class
     文件        3232  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxCreateEmptySignatureForm.class
     文件        6774  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxCreateSignature.class
     文件       11875  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxCreateSignaturebase.class
     文件       13174  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxCreateVisibleSignature.class
     文件        9478  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxShowSignature.class
     文件        5316  2017-10-07 19:18  pdfsignincom aoyuanpdfsignpdfboxTSAClient.class
     目录           0  2017-10-07 19:18  pdfsignincom aoyuanpdfsign est
     文件        1572  2017-10-07 19:18  pdfsignincom aoyuanpdfsign estTest.class
     文件        2528  2017-10-07 19:18  pdfsignin est.p12
     目录           0  2017-10-07 19:18  pdfsignlib
     文件      108232  2017-10-07 19:18  pdfsignlibcmail-jdk15on-158.jar
     文件      785915  2017-10-07 19:18  pdfsignlibcpkix-jdk15on-158.jar
     文件     3955990  2017-10-07 19:18  pdfsignlibcprov-jdk15on-158.jar
     文件     5599685  2017-10-07 19:18  pdfsignlibitextpdf-5.5.10-javadoc.jar
............此处省略25个文件信息