pdf加签章（copy 代码直接可用）
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加签章
* @author hxw
*
*/
public class ItextUtil {
public static final char[] PASSWORD = "Aa123456".toCharArray();// keystory密码
/**
* 单多次签章通用
*
* @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);
// 创建签章工具PdfStamper ，最后一个boolean参数是否允许被追加签名
// false的话，pdf文件只允许被签名一次，多次签名，最后一次有效
// true的话，pdf可以被追加签名，验签工具可以识别出每次签名之后文档是否被修改
PdfStamper stamper = PdfStamper.createSignature(reader,
tempArrayOutputStream, '\0', null, true);
// 获取数字签章属性对象
PdfSignatureAppearance appearance = stamper
.getSignatureAppearance();
appearance.setReason(signatureInfo.getReason());
appearance.setLocation(signatureInfo.getLocation());
// 设置签名的位置，页码，签名域名称，多次追加签名的时候，签名预名称不能一样 图片大小受表单域大小影响（过小导致压缩）
// 签名的位置，是图章相对于pdf页面的位置坐标，原点为pdf页面左下角
// 四个参数的分别是，图章左下角x，图章左下角y，图章右上角x，图章右上角y
appearance.setVisibleSignature(
new Rectangle(signatureInfo.getRectllx(), signatureInfo
.getRectlly(), signatureInfo.getRecturx(),
signatureInfo.getRectury()), signatureInfo.getPageNum(), signatureInfo
.getFieldName());
// 读取图章图片
Image image = Image.getInstance(signatureInfo.getImagePath());
appearance.setSignatureGraphic(image);
appearance.setCertificationLevel(signatureInfo
.getCertificationLevel());
// 设置图章的显示方式，如下选择的是只显示图章（还有其他的模式，可以图章和签名描述一同显示）
appearance.setRenderingMode(signatureInfo.getRenderingMode());
// 摘要算法
ExternalDigest digest = new BouncyCastleDigest();
// 签名算法
ExternalSignature signature = new PrivateKeySignature(
signatureInfo.getPk(), signatureInfo.getDigestAlgorithm(),
null);
// 调用itext签名方法完成pdf签章 //数字签名格式，CMS,CADE
MakeSignature.signDetached(appearance, digest, signature,
signatureInfo.getChain(), null, null, null, 0,
MakeSignature.CryptoStandard.CADES);
inputStream = new ByteArrayInputStream(
tempArrayOutputStream.toByteArray());
// 定义输入流为生成的输出流内容，以完成多次签章的过程
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) {
}
}
}
//找到关键字的位置，根据关键字进行平移和加签
String keyword = "11.4";
//使用另一篇文章中的找到关键字
//https://blog.csdn.net/hxwjilin/article/details/84560899
PdfKeywordFinder pd=new PdfKeywordFinder();
List
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();
// 将证书文件放入指定路径，并读取keystore ，获得私钥和证书链
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);
// 得到证书链
Certificate[] chain = ks.getCertificateChain(alias);
//需要进行签章的pdf
String path = "E:/temp/off_cnpc_plasthetics.pdf";
// 封装签章信息
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");
// 签章图片
signInfo.setImagePath(pathURL+"/images/gongzhang.png");
signInfo.setRenderingMode(PdfSignatureAppearance.RenderingMode.GRAPHIC);
signInfo.setRectllx(x+100); // 值越大，代表向x轴坐标平移 缩小 （反之，值越小，印章会放大）、获取的关键字x的坐标+100
signInfo.setRectlly(y); // 值越大，代表向y轴坐标向上平移（大小不变）、 获取的关键字y的坐标
signInfo.setRecturx(x); // 值越大 代表向x轴坐标向右平移 （大小不变） 获取的关键字x的坐标
signInfo.setRectury(y-100); // 值越大，代表向y轴坐标向上平移（大小不变）、 获取的关键字y的坐标-100
signInfo.setPageNum(pageNum);
//签章后的pdf路径
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; //签名的原因，显示在pdf签名属性中
private String location;//签名的地点，显示在pdf签名属性中
private String digestAlgorithm;//摘要算法名称，例如SHA-1
private String imagePath;//图章路径
private String fieldName;//表单域名称
private Certificate[] chain;//证书链
private PrivateKey pk;//签名私钥
private int certificationLevel = 0; //批准签章
private PdfSignatureAppearance.RenderingMode renderingMode;//表现形式：仅描述，仅图片，图片和描述，签章者和描述
//图章属性
private float rectllx ;//图章左下角x
private float rectlly ;//图章左下角y
private float recturx ;//图章右上角x
private float rectury ;//图章右上角y
private int pageNum;//第几页
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;
}
}