JAVA使用itextpdf文件,进行文件的创建流程、阅读加密、属性设置、中文显示处理、文档读取操作

程序猿最近要摘取pdf文件中的信息，选材用到了itextpdf工具包，整体比较简单，记录一下

1.pdf操作pom设置

<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
<dependency>
	<groupId>com.itextpdf</groupId>
	<artifactId>itextpdf</artifactId>
	<version>5.5.13</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian -->
<!-- 处理中文字符 -->
<dependency>
	<groupId>com.itextpdf</groupId>
	<artifactId>itext-asian</artifactId>
	<version>5.2.0</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15 -->
<!-- 设置pdf查看密码使用 -->
<!-- <dependency> 这个没用
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15</artifactId>
    <version>1.46</version>
</dependency> -->

<!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on -->
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>1.62</version>
</dependency>
		

2.pdf文件的创建、属性标注

package com.chl.tools;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Font;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.parser.PdfTextExtractor;

public class PdfParse {
	
	private static Logger logger = LoggerFactory.getLogger(PdfParse.class);

	private static String pdfPath = "/Users/chenhailong/Desktop/hellopdf.pdf";
	
	public static void main(String[] args) {
		createPdf();
	}
	
	/**
	 * 创建pdf文件
	 * 1.创建Document文档
	 * - 设置doc的多种属性
	 * 2.PdfWriter初始化
	 * 3.打开文档
	 * 4.写入内容
	 * 5.关闭文档
	 * 
	 * 添加 itext-asian.jar 处理 中文问题
	 */
	private static void createPdf() {
		try {
			//设置pdf的纸张大小、背景色
			Rectangle rect = new Rectangle(PageSize.A4.rotate());  
			rect.setBackgroundColor(BaseColor.WHITE);
			
			//设置doc属性
			Document document = new Document(rect); 
			document.addAuthor("作者");
			document.addCreator("创作者");
			document.addCreationDate();
			document.addKeywords("pdf");
			document.addSubject("主题");
			document.addTitle("标题");
			document.setMargins(10, 20, 30, 40);
			
			PdfWriter pw = PdfWriter.getInstance(document, new FileOutputStream(pdfPath));
			
			document.open();  
			document.add(new Paragraph("Hello World wh")); 
			
			//设置新的一页
			document.newPage();  
			pw.setPageEmpty(false);  
			document.newPage();  
			document.add(new Paragraph("New page"));  
			
			document.close();  
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (DocumentException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}  
	}
}

3.设置阅读密码

//设置阅读密码 
//userPassword the user password. Can be null or empty   
//ownerPassword the owner password. Can be null or empty
pw.setEncryption("123456".getBytes(), "123456".getBytes(),PdfWriter.ALLOW_SCREENREADERS,PdfWriter.STANDARD_ENCRYPTION_128);  

如果包引入的不对，可能会引发以下的异常

Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/asn1/ASN1Primitive
	at com.itextpdf.text.pdf.PdfEncryption.<init>(PdfEncryption.java:147)
	at com.itextpdf.text.pdf.PdfWriter.setEncryption(PdfWriter.java:2132)
	at com.chl.tools.PdfParse.createPdf(PdfParse.java:59)
	at com.chl.tools.PdfParse.main(PdfParse.java:27)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.ASN1Primitive
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 4 more

或

Exception in thread "main" java.lang.SecurityException: class "org.bouncycastle.asn1.ASN1Primitive"'s signer information does not match signer information of other classes in the same package
	at java.lang.ClassLoader.checkCerts(ClassLoader.java:898)
	at java.lang.ClassLoader.preDefineClass(ClassLoader.java:668)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:761)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at com.itextpdf.text.pdf.PdfEncryption.<init>(PdfEncryption.java:147)
	at com.itextpdf.text.pdf.PdfWriter.setEncryption(PdfWriter.java:2132)
	at com.chl.tools.PdfParse.createPdf(PdfParse.java:59)
	at com.chl.tools.PdfParse.main(PdfParse.java:27)

4.设置pdf可以写入中文

//如有中文，需要设置font字体 , 依赖 itext-asian
BaseFont bfChinese = BaseFont.createFont( "STSongStd-Light" ,"UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
Font font = new Font(bfChinese);
document.add(new Paragraph("这是中文汉字",font)); 

5.读取pdf文件

//读取pdf文件的内容
private static void readPdf(String pdfPath) {
	try {
		pdfPath = "/Users/chenhailong/Desktop/中华人民共和国刑法修正案(九)全文.pdf";
		
		PdfReader pdf = new PdfReader(pdfPath);
		int i =pdf.getNumberOfPages();
		for(int count = 1;count<=i;count++) {
			System.out.println(PdfTextExtractor.getTextFromPage(pdf, count));
		}
	} catch (IOException e) {
		logger.info("read failed!{}",e);
		e.printStackTrace();
	}
}

针对pdf的写入操作，包含很多设置,请参考官网

https://www.baidu.com/link?url=9S5DyJU8NsnQtyu2JTZnS5WMUfGFfbfB8-O4vYZ4l0-63zr6hftU3Ud0IWZrq7YZ&wd=&eqid=e5085c7800041983000000065d35d240

操作pdf有 itextpdf, apache poi等工具，各个之间的对比参考

https://blog.youkuaiyun.com/u012397189/article/details/80196974