java使用itextpdf生成pdf文档指定图片印章位置
java使用itextpdf生成pdf文件并添加印章
·
项目结构
1.引包
<dependencies>
<!-- itextpdf-->
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.10</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.10</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.7.22</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.freemarker/freemarker -->
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.19</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.xhtmlrenderer/flying-saucer-pdf -->
<dependency>
<groupId>org.xhtmlrenderer</groupId>
<artifactId>flying-saucer-pdf</artifactId>
<version>9.1.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.xhtmlrenderer/flying-saucer-pdf-itext5 -->
<dependency>
<groupId>org.xhtmlrenderer</groupId>
<artifactId>flying-saucer-pdf-itext5</artifactId>
<version>9.1.5</version>
</dependency>
</dependencies>
2.使用freemarker生成html文件
/**
* 获取模板内容 ： PDFHelper.getTemplateContent("071515133867.ftl", null);
* @param templateName 模板文件名
* @param param 模板参数
* @return
* @throws Exception
*/
public static String getTemplateContent(String templateName, Object param) {
Configuration configuration = new Configuration();
Writer out = null;
try {
configuration.setClassForTemplateLoading(PDFHelper.class, "/templates");
// 设置编码格式
configuration.setEncoding(Locale.CHINA, ENCODING);
out = new StringWriter();
Template template = configuration.getTemplate(templateName);
template.process(param, out);
out.flush();
return out.toString();
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
}
}
}
}
3.html转pdf
/**
* HTML 转 PDF
* @param content html内容
* @return PDF字节数组
*/
public static byte[] html2Pdf(String content, Image... imageList) {
ByteArrayOutputStream outputStream = null;
try {
Document document = new Document();
outputStream = new ByteArrayOutputStream();
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
XMLWorkerHelper.getInstance().parseXHtml(writer,
document,
new ByteArrayInputStream(content.getBytes()),
XMLWorkerHelper.class.getResourceAsStream("/default.css"),
Charset.forName(ENCODING),
new CustomXMLWorkerFontProvider());
if (imageList != null && imageList.length > 0) {
for (Image image : imageList) {
document.add(image);
}
}
document.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
return outputStream.toByteArray();
}
到此生成完毕。但是特殊情况需要添加印章之类的，因为博主开始是在html中使用img 标签和background发现样式都不生效。所以改用直接通过itextpdf的API添加
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="Content-Style-Type" content="text/css"/>
<meta name="generator" content="Aspose.Words for .NET 15.1.0.0"/>
<title></title></head>
<body>
<div>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="color:#00b050; font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RE_*: 'RE’代表repository。带有这个前缀的表包含“静态”信息，例如流程定义与流程资源（图片、规则等）。</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RE_DEPLOYMENT 流程部署表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RE_PROCDEF 流程定义信息表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RE_MODEL 模型信息表(此表已经舍弃,更换为ACT_DE_MODEL)</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none"> </span></p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="color:#00b050; font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_*: 'RU’代表runtime。这些表存储运行时信息，例如流程实例（process instance）、用户任务（user task）、变量（variable）、作业（job）等。Flowable只在流程实例运行中保存运行时数据，并在流程实例结束时删除记录。这样保证运行时表小和快。</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_EXECUTION 流程实例与分支执行表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_TASK 用户任务表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_VARIABLE 变量信息</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_IDENTITYLINK 参与者相关信息表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_EVENT_SUBSCR 事件订阅表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_JOB 作业表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_TIMER_JOB 定时器表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_SUSPENDED_JOB 暂停作业表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_DEADLETTER_JOB 死信表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_HISTORY_JOB 历史作业表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none"> </span></p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="color:#00b050; font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_*: 'HI’代表history。这些表存储历史数据，例如已完成的流程实例、变量、任务等。</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_PROCINST 历史流程实例表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_ACTINST 历史节点信息表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_TASKINST 历史任务表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_VARINST 历史变量</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_IDENTITYLINK 历史参与者表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_DETAIL 历史的流程运行中的细节信息</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_ATTACHMENT 附件表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_HI_COMMENT 评论表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none"> </span></p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="color:#00b050; font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_GE_*: 通用数据。在多处使用。</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_RU_JOB 作业表</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_GE_PROPERTY 属性表(保存流程引擎的kv键值属性)</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span
style="font-family:Consolas; font-size:10.5pt; font-style:normal; text-transform:none">ACT_GE_BTYEARRAY 资源表(存储流程定义相关的资源)</span>
</p>
<p style="margin:0pt; orphans:0; text-align:justify; widows:0"><span style="font-family:Calibri; font-size:10.5pt"> </span>
</p></div>
</body>
</html>
其中ACT_RU_JOB关键字出现两次，我想要在标记它出现的地方打印章，这里需要使用工具类找出PDF中出现关键字的位置
import cn.hutool.core.io.IoUtil;
import com.itextpdf.awt.geom.Rectangle2D;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.parser.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
public class ItextPDFUtil {
public static final float defaultHeight = 16;
public static final float fixHeight = 10;
/**
* findKeywordPostions
* 返回查找到关键字的首个文字的左上角坐标值
*
* @param keyword
* @return List<float [ ]> : float[0]:pageNum float[1]:x float[2]:y
* @throws IOException
*/
public static List<float[]> findKeywordPostions(InputStream pdfInputStream, String keyword) throws IOException {
byte[] pdfData = IoUtil.readBytes(pdfInputStream);
pdfInputStream.close();
List<float[]> result = new ArrayList<>();
List<PdfPageContentPositions> pdfPageContentPositions = getPdfContentPostionsList(pdfData);
for (PdfPageContentPositions pdfPageContentPosition : pdfPageContentPositions) {
List<float[]> charPositions = findPositions(keyword, pdfPageContentPosition);
if (charPositions == null || charPositions.size() < 1) {
continue;
}
result.addAll(charPositions);
}
return result;
}
/**
* findKeywordPostions
*
* @param pdfData 通过IO流 PDF文件转化的byte数组
* @param keyword 关键字
* @return List<float [ ]> : float[0]:pageNum float[1]:x float[2]:y
* @throws IOException
*/
public static List<float[]> findKeywordPostions(byte[] pdfData, String keyword) throws IOException {
List<float[]> result = new ArrayList<float[]>();
List<PdfPageContentPositions> pdfPageContentPositions = getPdfContentPostionsList(pdfData);
for (PdfPageContentPositions pdfPageContentPosition : pdfPageContentPositions) {
List<float[]> charPositions = findPositions(keyword, pdfPageContentPosition);
if (charPositions == null || charPositions.size() < 1) {
continue;
}
result.addAll(charPositions);
}
return result;
}
private static List<PdfPageContentPositions> getPdfContentPostionsList(byte[] pdfData) throws IOException {
PdfReader reader = new PdfReader(pdfData);
List<PdfPageContentPositions> result = new ArrayList<PdfPageContentPositions>();
int pages = reader.getNumberOfPages();
for (int pageNum = 1; pageNum <= pages; pageNum++) {
float width = reader.getPageSize(pageNum).getWidth();
float height = reader.getPageSize(pageNum).getHeight();
PdfRenderListener pdfRenderListener = new PdfRenderListener(pageNum, width, height);
//解析pdf，定位位置
PdfContentStreamProcessor processor = new PdfContentStreamProcessor(pdfRenderListener);
PdfDictionary pageDic = reader.getPageN(pageNum);
PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES);
try {
processor.processContent(ContentByteUtils.getContentBytesForPage(reader, pageNum), resourcesDic);
} catch (IOException e) {
reader.close();
throw e;
}
String content = pdfRenderListener.getContent();
List<CharPosition> charPositions = pdfRenderListener.getcharPositions();
List<float[]> positionsList = new ArrayList<float[]>();
for (CharPosition charPosition : charPositions) {
float[] positions = new float[]{charPosition.getPageNum(), charPosition.getX(), charPosition.getY(), charPosition.getWidth(), charPosition.getHeight()};
positionsList.add(positions);
}
PdfPageContentPositions pdfPageContentPositions = new PdfPageContentPositions();
pdfPageContentPositions.setContent(content);
pdfPageContentPositions.setPostions(positionsList);
result.add(pdfPageContentPositions);
}
reader.close();
return result;
}
private static List<float[]> findPositions(String keyword, PdfPageContentPositions pdfPageContentPositions) {
List<float[]> result = new ArrayList<float[]>();
String content = pdfPageContentPositions.getContent();
List<float[]> charPositions = pdfPageContentPositions.getPositions();
for (int pos = 0; pos < content.length(); ) {
int positionIndex = content.indexOf(keyword, pos);
if (positionIndex == -1) {
break;
}
float[] postions = charPositions.get(positionIndex);
//此处较为关键通过第一个关键字计算出整个关键字的宽度
for (int i = 1; i < keyword.length(); i++) {
float[] postionsNew = charPositions.get(positionIndex + i);
postions[3] = postions[3] + postionsNew[3];
}
result.add(postions);
pos = positionIndex + 1;
}
return result;
}
private static class PdfPageContentPositions {
private String content;
private List<float[]> positions;
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public List<float[]> getPositions() {
return positions;
}
public void setPostions(List<float[]> positions) {
this.positions = positions;
}
}
private static class PdfRenderListener implements RenderListener {
private int pageNum;
private float pageWidth;
private float pageHeight;
private StringBuilder contentBuilder = new StringBuilder();
private List<CharPosition> charPositions = new ArrayList<CharPosition>();
public PdfRenderListener(int pageNum, float pageWidth, float pageHeight) {
this.pageNum = pageNum;
this.pageWidth = pageWidth;
this.pageHeight = pageHeight;
}
@Override
public void beginTextBlock() {
}
@Override
public void renderText(TextRenderInfo renderInfo) {
List<TextRenderInfo> characterRenderInfos = renderInfo.getCharacterRenderInfos();
for (TextRenderInfo textRenderInfo : characterRenderInfos) {
String word = textRenderInfo.getText();
if (word.length() > 1) {
word = word.substring(word.length() - 1, word.length());
}
Rectangle2D.Float rectangle = textRenderInfo.getAscentLine().getBoundingRectange();
float x = (float) rectangle.getX();
float y = (float) rectangle.getY();
// float x = (float)rectangle.getCenterX();
// float y = (float)rectangle.getCenterY();
// double x = rectangle.getMinX();
// double y = rectangle.getMaxY();
//这两个是关键字在所在页面的XY轴的百分比
// float xPercent = Math.round(x / pageWidth * 10000) / 10000f;
// float yPercent = Math.round((1 - y / pageHeight) * 10000) / 10000f;
// CharPosition charPosition = new CharPosition(pageNum, xPercent, yPercent);
CharPosition charPosition = new CharPosition(pageNum, x, y - fixHeight, (float) rectangle.getWidth(), (float) (rectangle.getHeight() == 0 ? defaultHeight : rectangle.getHeight()));
charPositions.add(charPosition);
contentBuilder.append(word);
}
}
@Override
public void endTextBlock() {
}
@Override
public void renderImage(ImageRenderInfo renderInfo) {
}
public String getContent() {
return contentBuilder.toString();
}
public List<CharPosition> getcharPositions() {
return charPositions;
}
}
private static class CharPosition {
private int pageNum = 0;
private float x = 0;
private float y = 0;
private float width;
private float height;
public CharPosition(int pageNum, float x, float y, float width, float height) {
this.pageNum = pageNum;
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
public int getPageNum() {
return pageNum;
}
public float getX() {
return x;
}
public float getY() {
return y;
}
public float getWidth() {
return width;
}
public float getHeight() {
return height;
}
@Override
public String toString() {
return "CharPosition{" +
"pageNum=" + pageNum +
", x=" + x +
", y=" + y +
", width=" + width +
", height=" + height +
'}';
}
}
}
使用main方法执行
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.*;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
public class Test {
public static void main(String[] args) throws IOException, DocumentException {
String html = PDFHelper.getTemplateContent("071515133867.ftl", null);
byte[] bytes = PDFHelper.html2Pdf(html);
//查找位置
List<float[]> postions = ItextPDFUtil.findKeywordPostions(bytes, "ACT_RU_JOB");
// 第一次找到的位置
float[] postion = postions.get(0);
System.out.println("x:" + postion[1] + " y:" + postion[2]);
//Modify file using PdfReader
//Read file using PdfReader
PdfReader pdfReader = new PdfReader(bytes);
PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileOutputStream("D:/test.pdf"));
Image image = Image.getInstance("E:\\workspace\\java_pdf\\src\\main\\resources\\images\\69f70ad3-1cd7-4793-8c89-99dea0311a1b.001.png");
//Fixed Positioning
// 固定图片大小
image.scaleAbsolute(100, 100);
//Scale to new height and new width of image
// 偏移量
image.setAbsolutePosition(postion[1], postion[2]);
System.out.println("pages-1:" + pdfReader.getNumberOfPages());
PdfContentByte content = pdfStamper.getUnderContent((int) postion[0]);
content.addImage(image);
// 第二次找到的位置
postion = postions.get(1);
//Fixed Positioning
// image.scaleToFit(100, 50);
image.scaleAbsolute(100, 100);
//Scale to new height and new width of image
image.setAbsolutePosition(postion[1], postion[2]);
System.out.println("pages-2:" + pdfReader.getNumberOfPages());
content = pdfStamper.getUnderContent((int) postion[0]);
content.addImage(image);
// ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
// byte[] pdf = content.toPdf(PdfWriter.getInstance(content.getPdfDocument(), outputStream));
pdfStamper.close();
}
}
最后看一下效果
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