Java读写pdf文件

在OA业务开发中，经常需要java后台读取或生成pdf文件，itextpdf是一个常用的java操作pdf的开源库

物料准备：
1.引入itextpdf依赖
2.定义Text2PdfUtil工具类

引入itextpdf相关的依赖

 <dependency>             <groupId>com.itextpdfgroupId>             <artifactId>itext-asianartifactId>             <version>5.2.0version>         dependency>          <dependency>            <groupId>com.itextpdfgroupId>            <artifactId>itextpdfartifactId>            <version>5.5.13version>        dependency>

定义工具类Text2PdfUtil.java

package cn.ath.knowwikibackend.util;import com.itextpdf.text.Document;import com.itextpdf.text.DocumentException;import com.itextpdf.text.Font;import com.itextpdf.text.Paragraph;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;import java.io.*;import java.NIO.charset.Charset;public class Text2PdfUtil {        public static void text2pdf(String text,String pdf) throws DocumentException, IOException {        Document doc = new Document();        OutputStream os = new FileOutputStream(new File(pdf));        PdfWriter.getInstance(doc, os);        doc.open();        //指定 使用内置的中文字体        BaseFont baseFont =                BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);        Font font = new Font(baseFont,12,Font.NORMAL);        //指定输出编码为UTF-8        InputStreamReader isr = new InputStreamReader(                new FileInputStream(new File(text)), Charset.forName("UTF-8"));        BufferedReader br = new BufferedReader(isr);        String str = "";        while((str = br.readLine()) != null){            doc.add(new Paragraph(str,font));        }        isr.close();        br.close();        doc.close();    }        public static String readPDF(String filename){        StringBuilder result = new StringBuilder();        try {            PdfReader reader = new PdfReader(filename);            int countPage = reader.getNumberOfPages();            for(int i=1;i<=countPage;i++){                result.append(PdfTextExtractor.getTextFromPage(reader, i));            }            reader.close();        } catch (IOException e) {            e.printStackTrace();        }        return result.toString();    }}

测试

@Test    void contextLoads() throws DocumentException, IOException {        String txtPath = "E:/test617.txt";        String pdfPath = "E:/test617.pdf";        Text2PdfUtil.text2pdf(txtPath,pdfPath);        System.out.println(Text2PdfUtil.readPDF(pdfPath));    }

来源地址：https://blog.csdn.net/ThinkPet/article/details/131256428