前言
給pdf添加水印功能是日常開發中經常會遇到的問題,下面我們就來看看怎麼通過Java實現給pdf文件添加水印
環境
新創建個Spring Boot的項目,然後添加itextpdf的依賴,具體的pom.xml如下:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo-pdf</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo-pdf</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.4.3</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
代碼
/**
* Copyright 2020. thunisoft.com Studio All Right Reserved
* <p>
* Create on 2020-05-19 17:05
* Created by zhaoxinguo
* Version 2.0.0
*/
package com.example.demopdf.test;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Element;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;
import java.io.FileOutputStream;
/**
* @description: TODO
* @author zhaoxinguo
* @date 2020/5/19 17:05
*/
public class PdfTest {
public static void main(String[] args) {
waterMark("E:\\BaiduNetdiskDownload\\Spring Microservices in Action.pdf", "E:\\BaiduNetdiskDownload\\Spring Microservices in Action 副本.pdf", "市委組織部");
}
/**
* @param inputFile 你的PDF文件地址
* @param outputFile 添加水印後生成PDF存放的地址
* @param waterMarkName 你的水印
* @return
*/
public static boolean waterMark(String inputFile,
String outputFile, String waterMarkName) {
try {
PdfReader reader = new PdfReader(inputFile);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));
//這裏的字體設置比較關鍵,這個設置是支持中文的寫法
BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系統字體
int total = reader.getNumberOfPages() + 1;
PdfContentByte under;
Rectangle pageRect = null;
for (int i = 1; i < total; i++) {
pageRect = stamper.getReader().getPageSizeWithRotation(i);
// 計算水印X,Y座標
float x = pageRect.getWidth()/10;
float y = pageRect.getHeight()/10-10;
// 獲得PDF最頂層
under = stamper.getOverContent(i);
under.saveState();
// set Transparency
PdfGState gs = new PdfGState();
// 設置透明度爲0.2
gs.setFillOpacity(1.f);
under.setGState(gs);
under.restoreState();
under.beginText();
under.setFontAndSize(base, 60);
under.setColorFill(BaseColor.ORANGE);
// 水印文字成45度角傾斜
under.showTextAligned(Element.ALIGN_CENTER, waterMarkName, x, y, 55);
// 添加水印文字
under.endText();
under.setLineWidth(1f);
under.stroke();
}
stamper.close();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
}
運行結果
結束語
以上就是Spring Boot 集成 itextpdf 實現給PDF添加水印的全部內容,如有問題歡迎加入QQ交流羣:羣號:715224124,謝謝!