关于itext生成pdf的新的demo(包含简单的提取txt文件的内容 和xml内容转化为pdf)

2021-08-20 13:30:19

一.用的iText版本为7.0.2版本,maven的配置如下：

<dependencies>

    <!-- always needed -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>kernel</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- always needed -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>io</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- always needed -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>layout</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- only needed for forms -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>forms</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- only needed for PDF/A -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>pdfa</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- only needed for digital signatures -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>sign</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- only needed for barcodes -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>barcodes</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- only needed for Asian fonts -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>font-asian</artifactId>

        <version>7.0.3</version>

    </dependency>

    <!-- only needed for hyphenation -->

    <dependency>

        <groupId>com.itextpdf</groupId>

        <artifactId>hyph</artifactId>

        <version>7.0.3</version>

    </dependency>

</dependencies>

二.以下就是本次更新的demo代码

package com.cn.shupu.util;

import java.awt.Font;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.text.DecimalFormat;

import java.util.ArrayList;

import java.util.List;

import org.apache.ibatis.datasource.pooled.PooledDataSourceFactory;

import org.apache.poi.hslf.model.textproperties.TextAlignmentProp;

import org.apache.poi.hwpf.extractor.WordExtractor;

import org.apache.poi.xwpf.extractor.XWPFWordExtractor;

import org.apache.poi.xwpf.usermodel.XWPFDocument;

import com.itextpdf.io.codec.Base64;

import com.itextpdf.io.font.FontProgram;

import com.itextpdf.io.font.FontProgramFactory;

import com.itextpdf.io.font.PdfEncodings;

import com.itextpdf.io.font.otf.Glyph;

import com.itextpdf.io.util.DecimalFormatUtil;

import com.itextpdf.kernel.events.Event;

import com.itextpdf.kernel.events.IEventHandler;

import com.itextpdf.kernel.events.PdfDocumentEvent;

import com.itextpdf.kernel.font.PdfFont;

import com.itextpdf.kernel.font.PdfFontFactory;

import com.itextpdf.kernel.geom.PageSize;

import com.itextpdf.kernel.pdf.PdfDocument;

import com.itextpdf.kernel.pdf.PdfWriter;

import com.itextpdf.kernel.pdf.canvas.draw.ILineDrawer;

import com.itextpdf.kernel.pdf.filespec.PdfDictionaryFS;

import com.itextpdf.layout.Document;

import com.itextpdf.layout.element.Paragraph;

import com.itextpdf.layout.element.Tab;

import com.itextpdf.layout.element.TabStop;

import com.itextpdf.layout.element.Text;

import com.itextpdf.layout.font.FontFamilySplitter;

import com.itextpdf.layout.font.FontSelector;

import com.itextpdf.layout.font.FontSet;

import com.itextpdf.layout.property.TabAlignment;

import com.itextpdf.layout.property.TextAlignment;

import com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException;

public class ItextForPDF {

    public static final String FONT = "C:\\Windows\\Fonts\\simsun.ttc,1";// 利用windows自带的字体，对中文和特殊字符处理

    static DecimalFormat df = new DecimalFormat();

    public static OutputStream createFile(String fileName) {

        File file = new File(fileName);

        if (!new File(file.getParent()).exists())

            new File(file.getParent()).mkdirs();

        try {

            file.createNewFile();

        } catch (IOException e1) {

            // TODO Auto-generated catch block

            e1.printStackTrace();

        }

        OutputStream os = null;

        try {

            os = new FileOutputStream(file);

        } catch (FileNotFoundException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return os;

    }

    public static void txtToPdf(String txtPath, String pdfPath) {

        PdfWriter writer = new PdfWriter(createFile(pdfPath));

        PdfDocument pdf = new PdfDocument(writer);

        PageSize pageSize = PageSize.A4;

        // 中文处理和特殊字符处理

        PdfFont font = null;

        try {

            font = PdfFontFactory.createFont(FONT, PdfEncodings.IDENTITY_H, false);

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        Document document = new Document(pdf, pageSize);

        BufferedReader br = null;

        try {

            br = new BufferedReader(new InputStreamReader(new FileInputStream(txtPath), "GBK"));

            String line = null;

            while ((line = br.readLine()) != null) {

                Text text = new Text(line.trim());

                Paragraph p = new Paragraph("\n").setFont(font).setFontSize(10f);

                p.add(text);

                document.add(p);

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } finally {

            if (document != null) {

                document.close();

                try {

                    if (writer != null) {

                        writer.close();

                    }

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

                if (pdf != null) {

                    pdf.close();

                }

            }

        }

    }

    public static void xmlToPDF(String xmlPath, String pdfPath) {

        PdfWriter writer = new PdfWriter(createFile(pdfPath));

        PdfDocument pdf = new PdfDocument(writer);

        PageSize pageSize = PageSize.A4;

        // 中文处理和特殊字符处理

        PdfFont font = null;

        try {

            font = PdfFontFactory.createFont(FONT, PdfEncodings.IDENTITY_H, false);

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        Document document = new Document(pdf, pageSize);

        BufferedReader br = null;

        try {

            br =  new BufferedReader(new InputStreamReader(new FileInputStream(xmlPath), "UTF-8"));

            String line = null;

            while ((line = br.readLine()) != null) {

                Text text = new Text(line.trim());

                Paragraph p = new Paragraph("\n").setFont(font).setFontSize(10f);

                p.add(text);

                document.add(p);

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } finally {

            if (document != null) {

                document.close();

                try {

                    if (writer != null) {

                        writer.close();

                    }

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

                if (pdf != null) {

                    pdf.close();

                }

            }

        }

    }

    public static void wordToPdf(String wordPath,String pdfPath){

        PdfWriter writer = new PdfWriter(createFile(pdfPath));

        PdfDocument pdf = new PdfDocument(writer);

        PageSize pageSize = PageSize.A4;

        // 中文处理和特殊字符处理

        PdfFont font = null;

        try {

            font = PdfFontFactory.createFont(FONT, PdfEncodings.IDENTITY_H, false);

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        Document document = new Document(pdf, pageSize);

        BufferedReader br = null;

        try {

            br =  new BufferedReader(new InputStreamReader(new FileInputStream(wordPath), "GBK"));

            String line = null;

            while ((line = br.readLine()) != null) {

                Text text = new Text(line.trim());

                Paragraph p = new Paragraph("\n").setFont(font).setFontSize(10f);

                p.add(text);

                document.add(p);

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } finally {

            if (document != null) {

                document.close();

                try {

                    if (writer != null) {

                        writer.close();

                    }

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

                if (pdf != null) {

                    pdf.close();

                }

            }

        }

    }

三.关于对于中文的处理：

1.对于中文的处理需要我添加一个itext-asian-5.2.0.jar包，可以对中文进行处理。而你可能下载不能是这个版本，可能会引起错误的。

一下是对之前版本的处理：

假如你加入的iTextAsian.jar的版本为5.0.6；会 出现异常 Font 'STSong-Light' with 'UniGB-UCS2-H'

　　我使用的是iText 5.0.6 加入了iTextAsian.jar就报错.

　　com.itextpdf.text.DocumentException: Font 'STSongStd-Light' with 'UniGB-UCS2-H' is not recognized.

　　参考博客:x

　　找的原因和解决方法:

　　原因:iText5以上就改了命名空间了.是 com/itextpdf/text/pdf/fonts/

　　但是iTextAsian还没有改.他的命名空间是 com/lowagie /text/pdf/fonts/

　　所以报错..

　　解决方法.:

　　1.用winrar解压iTextAsian.jar

　　2. 将com文件夹下面的lowagie 修改为itextpdf .

　　3.进入cmd . 切换到iTextAsian目录.

　　4.执行命令 jar cvf iTextAsian.jar com/itextpdf/text/pdf/fonts/*

　　5.将生成的iTextAsian.jar文件替换原来的.

　　问题解决.

//解决中文的代码:

PdfFont font = null;

try {

font = PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H", false);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

以上我用Itext7对一小段文字是没有问题，但是当对一个txt文档进行转化时，系统就会报错，大概意思就是pdfFont为null之类的。（具体的报错信息不记得）

2.这次对iText7版本来说：中文处理就没有用到了第三方的jar包

 public static final String FONT = "C:\\Windows\\Fonts\\simsun.ttc,1";// 利用windows自带的字体，对中文和特殊字符处理 这个是再类中定义的全局的字体路径
   // 中文处理和特殊字符处理

        PdfFont font = null;

        try {

            font = PdfFontFactory.createFont(FONT, PdfEncodings.IDENTITY_H, false);

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }




这个是iText7中不使用了itext-asian-5.2.0.jar之类的jar，而是可以加载第三方的字体库来支持中文字体的；


本人是刚出生的小猿，有什么不足之处，请大神提点.
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