说明

这里需要下载一个字体文件，代码中的/root/simsun.ttc是字体文件，需要提前下载好，并放在指定的目录，这里的/root/simsun.ttc是字体文件的路径，需要根据实际情况进行修改。
下载地址：https://github.com/jiaxiaochu/font/blob/master/simsun.ttc

引入依赖

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<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox-tools</artifactId>
    <version>3.0.0</version>
</dependency>
<dependency>
    <groupId>net.sf.cssbox</groupId>
    <artifactId>pdf2dom</artifactId>
    <version>2.0.1</version>
</dependency>
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.10</version>
</dependency>
<dependency>
    <groupId>com.itextpdf.tool</groupId>
    <artifactId>xmlworker</artifactId>
    <version>5.5.10</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-scratchpad</artifactId>
    <version>3.15</version>
</dependency>

代码实现

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import com.itextpdf.text.*;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;

/**
 * PdfUtil Pdf文件工具
 *
 * @author zq
 * @version 2024/09/26 22:
 **/
public class PdfUtil {
    public static void createPdf(String content, String pdfPath) throws IOException, DocumentException {
        Document pdfDoc = new Document(PageSize.A4);
        PdfWriter.getInstance(pdfDoc, new FileOutputStream(pdfPath))
                .setPdfVersion(PdfWriter.PDF_VERSION_1_7);
        pdfDoc.open();
        BaseFont bfChinese = BaseFont.createFont("/root/simsun.ttc,1", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        Font myfont = new Font(bfChinese, 11, Font.NORMAL);
        pdfDoc.add(new Paragraph("\n"));
        Paragraph para = new Paragraph(content + "\n", myfont);
        para.setAlignment(Element.ALIGN_JUSTIFIED);
        pdfDoc.add(para);
        pdfDoc.close();
    }

    public static void txt2pdf(String txtPath, String pdfPath) throws IOException, DocumentException {
        Document pdfDoc = new Document(PageSize.A4);
        PdfWriter.getInstance(pdfDoc, new FileOutputStream(pdfPath))
                .setPdfVersion(PdfWriter.PDF_VERSION_1_7);
        pdfDoc.open();
        BaseFont bfChinese = BaseFont.createFont("/root/simsun.ttc,1", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        Font myfont = new Font(bfChinese, 11, Font.NORMAL);
        pdfDoc.add(new Paragraph("\n"));
        BufferedReader br = new BufferedReader(new FileReader(txtPath));
        String strLine;
        while ((strLine = br.readLine()) != null) {
            Paragraph para = new Paragraph(strLine + "\n", myfont);
            para.setAlignment(Element.ALIGN_JUSTIFIED);
            pdfDoc.add(para);
        }
        pdfDoc.close();
        br.close();

    }
}