pdf加簽章（copy 代碼直接可用）

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.security.BouncyCastleDigest;
import com.itextpdf.text.pdf.security.DigestAlgorithms;
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.PrivateKeySignature;
import com.bky.test.scpdf.PDFUtil;
import com.bky.test.guanjianzi.PdfKeywordFinder;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.util.List;

/**
* pdf加簽章
* @author hxw
*
*/
public class ItextUtil {

public static final char[] PASSWORD = "Aa123456".toCharArray();// keystory密碼

/**
* 單多次簽章通用
*
* @param src
* @param target
* @param signatureInfos
* @throws GeneralSecurityException
* @throws IOException
* @throws DocumentException
*/
@SuppressWarnings("resource")
public void sign(String src, String target, SignatureInfo signatureInfo) {
InputStream inputStream = null;
FileOutputStream outputStream = null;
ByteArrayOutputStream result = new ByteArrayOutputStream();
try {
inputStream = new FileInputStream(src);
ByteArrayOutputStream tempArrayOutputStream = new ByteArrayOutputStream();
PdfReader reader = new PdfReader(inputStream);
// 創建簽章工具PdfStamper ，最後一個boolean參數是否允許被追加簽名
// false的話，pdf文件只允許被簽名一次，多次簽名，最後一次有效
// true的話，pdf可以被追加簽名，驗籤工具可以識別出每次簽名之後文檔是否被修改
PdfStamper stamper = PdfStamper.createSignature(reader,
tempArrayOutputStream, '\0', null, true);
// 獲取數字簽章屬性對象
PdfSignatureAppearance appearance = stamper
.getSignatureAppearance();
appearance.setReason(signatureInfo.getReason());
appearance.setLocation(signatureInfo.getLocation());
// 設置簽名的位置，頁碼，簽名域名稱，多次追加簽名的時候，簽名預名稱不能一樣圖片大小受表單域大小影響（過小導致壓縮）
// 簽名的位置，是圖章相對於pdf頁面的位置座標，原點爲pdf頁面左下角
// 四個參數的分別是，圖章左下角x，圖章左下角y，圖章右上角x，圖章右上角y
appearance.setVisibleSignature(
new Rectangle(signatureInfo.getRectllx(), signatureInfo
.getRectlly(), signatureInfo.getRecturx(),
signatureInfo.getRectury()), signatureInfo.getPageNum(), signatureInfo
.getFieldName());
// 讀取圖章圖片
Image image = Image.getInstance(signatureInfo.getImagePath());
appearance.setSignatureGraphic(image);
appearance.setCertificationLevel(signatureInfo
.getCertificationLevel());
// 設置圖章的顯示方式，如下選擇的是隻顯示圖章（還有其他的模式，可以圖章和簽名描述一同顯示）
appearance.setRenderingMode(signatureInfo.getRenderingMode());
// 摘要算法
ExternalDigest digest = new BouncyCastleDigest();
// 簽名算法
ExternalSignature signature = new PrivateKeySignature(
signatureInfo.getPk(), signatureInfo.getDigestAlgorithm(),
null);
// 調用itext簽名方法完成pdf簽章 //數字簽名格式，CMS,CADE
MakeSignature.signDetached(appearance, digest, signature,
signatureInfo.getChain(), null, null, null, 0,
MakeSignature.CryptoStandard.CADES);

inputStream = new ByteArrayInputStream(
tempArrayOutputStream.toByteArray());
// 定義輸入流爲生成的輸出流內容，以完成多次簽章的過程
result = tempArrayOutputStream;

outputStream = new FileOutputStream(new File(target));
outputStream.write(result.toByteArray());
outputStream.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != outputStream) {
outputStream.close();
}
if (null != inputStream) {
inputStream.close();
}
if (null != result) {
result.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

public static void main(String[] args) {
   String pathURL = PDFUtil.getPath();
   int pageNum=0;
   int x=0;
   int y=0;
try {

   File pdfFile = new File("E:/temp/off_cnpc_plasthetics.pdf");
       byte[] pdfData = new byte[(int) pdfFile.length()];
       FileInputStream inputStream = null;
       try {
           inputStream = new FileInputStream(pdfFile);
           inputStream.read(pdfData);
       } catch (IOException e) {
           throw e;
       } finally {
           if (inputStream != null) {
               try {
                   inputStream.close();
               } catch (IOException e) {
               }
           }
       }
       //找到關鍵字的位置，根據關鍵字進行平移和加簽
       String keyword = "11.4";

//使用另一篇文章中的找到關鍵字

//https://blog.csdn.net/hxwjilin/article/details/84560899
PdfKeywordFinder pd=new PdfKeywordFinder();
List<float[]> positions = pd.findKeywordPostions(pdfData, keyword);

       System.out.println("total:" + positions.size());
       if (positions != null && positions.size() > 0) {
           for (float[] position : positions) {
               System.out.print("pageNum: " + (int) position[0]);

               System.out.print("\tx: " + position[1]);
               System.out.println("\ty: " + position[2]);
               pageNum=(int) position[0];
               x=(int) position[1];
               y=(int) position[2];
           }
       }

ItextUtil app = new ItextUtil();
// 將證書文件放入指定路徑，並讀取keystore ，獲得私鑰和證書鏈
String pkPath =pathURL+"templates/tomatocc.p12";
KeyStore ks = KeyStore.getInstance("PKCS12");
ks.load(new FileInputStream(pkPath), PASSWORD);
String alias = ks.aliases().nextElement();
PrivateKey pk = (PrivateKey) ks.getKey(alias, PASSWORD);
// 得到證書鏈
Certificate[] chain = ks.getCertificateChain(alias);
//需要進行簽章的pdf
String path = "E:/temp/off_cnpc_plasthetics.pdf";
// 封裝簽章信息
SignatureInfo signInfo = new SignatureInfo();
signInfo.setReason("理由");
signInfo.setLocation("位置");
signInfo.setPk(pk);
signInfo.setChain(chain);
signInfo.setCertificationLevel(PdfSignatureAppearance.NOT_CERTIFIED);
signInfo.setDigestAlgorithm(DigestAlgorithms.SHA1);
signInfo.setFieldName("demo");
// 簽章圖片
signInfo.setImagePath(pathURL+"/images/gongzhang.png");
signInfo.setRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);
signInfo.setRectllx(x+100); // 值越大，代表向x軸座標平移縮小（反之，值越小，印章會放大）、獲取的關鍵字x的座標+100
signInfo.setRectlly(y); // 值越大，代表向y軸座標向上平移（大小不變）、獲取的關鍵字y的座標
signInfo.setRecturx(x); // 值越大代表向x軸座標向右平移（大小不變）獲取的關鍵字x的座標
signInfo.setRectury(y-100); // 值越大，代表向y軸座標向上平移（大小不變）、獲取的關鍵字y的座標-100
signInfo.setPageNum(pageNum);
//簽章後的pdf路徑
app.sign(path, "E:/temp/demo4.pdf", signInfo);
} catch (Exception e) {
e.printStackTrace();
}
}
}

import com.itextpdf.text.pdf.PdfSignatureAppearance;
import java.security.PrivateKey;
import java.security.cert.Certificate;

public class SignatureInfo {
private String reason; //簽名的原因，顯示在pdf簽名屬性中
private String location;//簽名的地點，顯示在pdf簽名屬性中
private String digestAlgorithm;//摘要算法名稱，例如SHA-1
private String imagePath;//圖章路徑
private String fieldName;//表單域名稱
private Certificate[] chain;//證書鏈
private PrivateKey pk;//簽名私鑰
private int certificationLevel = 0; //批准簽章
private PdfSignatureAppearance.RenderingMode renderingMode;//表現形式：僅描述，僅圖片，圖片和描述，簽章者和描述
//圖章屬性
private float rectllx ;//圖章左下角x
private float rectlly ;//圖章左下角y
private float recturx ;//圖章右上角x
private float rectury ;//圖章右上角y
private int pageNum;//第幾頁

   public int getPageNum() {
       return pageNum;
   }
   public void setPageNum(int pageNum) {
       this.pageNum = pageNum;
   }
   public float getRectllx() {
return rectllx;
}
public void setRectllx(float rectllx) {
this.rectllx = rectllx;
}
public float getRectlly() {
return rectlly;
}
public void setRectlly(float rectlly) {
this.rectlly = rectlly;
}
public float getRecturx() {
return recturx;
}
public void setRecturx(float recturx) {
this.recturx = recturx;
}
public float getRectury() {
return rectury;
}
public void setRectury(float rectury) {
this.rectury = rectury;
}

public String getReason() {
return reason;
}
public void setReason(String reason) {
this.reason = reason;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getDigestAlgorithm() {
return digestAlgorithm;
}
public void setDigestAlgorithm(String digestAlgorithm) {
this.digestAlgorithm = digestAlgorithm;
}
public String getImagePath() {
return imagePath;
}
public void setImagePath(String imagePath) {
this.imagePath = imagePath;
}
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
public Certificate[] getChain() {
return chain;
}
public void setChain(Certificate[] chain) {
this.chain = chain;
}
public PrivateKey getPk() {
return pk;
}
public void setPk(PrivateKey pk) {
this.pk = pk;
}
public int getCertificationLevel() {
return certificationLevel;
}
public void setCertificationLevel(int certificationLevel) {
this.certificationLevel = certificationLevel;
}
public PdfSignatureAppearance.RenderingMode getRenderingMode() {
return renderingMode;
}
public void setRenderingMode(PdfSignatureAppearance.RenderingMode renderingMode) {
this.renderingMode = renderingMode;
}

}

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