itext7学习笔记

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来源：https://blog.csdn.net/u012397189/category_9270695.html

itext7学习笔记——第5章实践&example

转x33g5p2x  于2021-12-28 转载在 其他  
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本章的例子，请参考我翻译的博文：itext7学习笔记——第5章,里面有详细的解释,有什么不懂得也可以评论或者私信我！

例子1：添加注释和内容

我们读取一个带有表单的PDF文档，往里面添加文档注释、一些文本和一个新的复选框，代码如下：

import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfButtonFormField;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfString;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.action.PdfAction;
import com.itextpdf.kernel.pdf.annot.PdfAnnotation;
import com.itextpdf.kernel.pdf.annot.PdfTextAnnotation;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import java.io.File;
import java.io.IOException;

/** * Simple adding annotations example. */
public class C05E01_AddAnnotationsAndContent {

    public static final String SRC = "src/main/resources/pdf/job_application.pdf";
    public static final String DEST = "results/chapter05/edited_job_application.pdf";

    public static void main(String args[]) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C05E01_AddAnnotationsAndContent().manipulatePdf(SRC, DEST);
    }

    public void manipulatePdf(String src, String dest) throws IOException {

        //Initialize PDF document
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));

        //Add text annotation
        PdfAnnotation ann = new PdfTextAnnotation(new Rectangle(400, 795, 0, 0))
                .setTitle(new PdfString("iText"))
                .setContents("Please, fill out the form.")
                .setOpen(true);
        pdfDoc.getFirstPage().addAnnotation(ann);

        PdfCanvas canvas = new PdfCanvas(pdfDoc.getFirstPage());
        canvas.beginText().setFontAndSize(PdfFontFactory.createFont(FontConstants.HELVETICA), 12)
                .moveText(265, 597)
                .showText("I agree to the terms and conditions.")
                .endText();

        //Add form field
        PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true);
        PdfButtonFormField checkField = PdfFormField.createCheckBox(pdfDoc, new Rectangle(245, 594, 15, 15),
                "agreement", "Off", PdfFormField.TYPE_CHECK);
        checkField.setRequired(true);
        form.addField(checkField);

        //Update reset button
        form.getField("reset").setAction(PdfAction.createResetForm(new String[]{"name", "language",
                "experience1", "experience2", "experience3", "shift", "info", "agreement"}, 0));

        pdfDoc.close();

    }
}

例子2：改变表单字段属性

我们读取一个带有表单的PDF文档，然后改变字段的属性，添加属性或者删除属性，代码如下：

import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.pdf.*;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/** * Simple filling out form example. */
public class C05E02_FillAndModifyForm {

    public static final String SRC = "src/main/resources/pdf/job_application.pdf";
    public static final String DEST = "results/chapter05/filled_out_job_application.pdf";

    public static void main(String args[]) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C05E02_FillAndModifyForm().manipulatePdf(SRC, DEST);
    }

    public void manipulatePdf(String src, String dest) throws IOException {

        //Initialize PDF document
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));

        PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true);
        Map<String, PdfFormField> fields = form.getFormFields();

        fields.get("name").setValue("James Bond").setBackgroundColor(Color.ORANGE);
        fields.get("language").setValue("English");

        fields.get("experience1").setValue("Yes");
        fields.get("experience2").setValue("Yes");
        fields.get("experience3").setValue("Yes");

        List<PdfString> options = new ArrayList<PdfString>();
        options.add(new PdfString("Any"));
        options.add(new PdfString("8.30 am - 12.30 pm"));
        options.add(new PdfString("12.30 pm - 4.30 pm"));
        options.add(new PdfString("4.30 pm - 8.30 pm"));
        options.add(new PdfString("8.30 pm - 12.30 am"));
        options.add(new PdfString("12.30 am - 4.30 am"));
        options.add(new PdfString("4.30 am - 8.30 am"));
        PdfArray arr = new PdfArray(options);
        fields.get("shift").setOptions(arr);
        fields.get("shift").setValue("Any");

        PdfFont courier = PdfFontFactory.createFont(FontConstants.COURIER);
        fields.get("info").setValue("I was 38 years old when I became an MI6 agent.", courier, 7f);

        pdfDoc.close();

    }
}

例子3：添加页眉、页脚和水印

我们读取一个带有ufo信息的PDF文档，往里面添加页眉、页脚和水印，代码如下：

import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.kernel.pdf.extgstate.PdfExtGState;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.VerticalAlignment;

import java.io.File;
import java.io.IOException;

/** * Simple adding content example. */
public class C05E03_AddContent {

    public static final String SRC = "src/main/resources/pdf/ufo.pdf";

    public static final String DEST = "results/chapter05/add_content.pdf";

    public static void main(String args[]) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C05E03_AddContent().manipulatePdf(SRC, DEST);
    }

    public void manipulatePdf(String src, String dest) throws IOException {

        //Initialize PDF document
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));

        Document document = new Document(pdfDoc);
        Rectangle pageSize;
        PdfCanvas canvas;
        int n = pdfDoc.getNumberOfPages();
        for (int i = 1; i <= n; i++) {
            PdfPage page = pdfDoc.getPage(i);
            pageSize = page.getPageSize();
            canvas = new PdfCanvas(page);
            //Draw header text
            canvas.beginText().setFontAndSize(PdfFontFactory.createFont(FontConstants.HELVETICA), 7)
                    .moveText(pageSize.getWidth() / 2 - 24, pageSize.getHeight() - 10)
                    .showText("I want to believe")
                    .endText();
            //Draw footer line
            canvas.setStrokeColor(Color.BLACK)
                    .setLineWidth(.2f)
                    .moveTo(pageSize.getWidth() / 2 - 30, 20)
                    .lineTo(pageSize.getWidth() / 2 + 30, 20).stroke();
            //Draw page number
            canvas.beginText().setFontAndSize(PdfFontFactory.createFont(FontConstants.HELVETICA), 7)
                    .moveText(pageSize.getWidth() / 2 - 7, 10)
                    .showText(String.valueOf(i))
                    .showText(" of ")
                    .showText(String.valueOf(n))
                    .endText();
            //Draw watermark
            Paragraph p = new Paragraph("CONFIDENTIAL").setFontSize(60);
            canvas.saveState();
            PdfExtGState gs1 = new PdfExtGState().setFillOpacity(0.2f);
            canvas.setExtGState(gs1);
            document.showTextAligned(p,
                    pageSize.getWidth() / 2, pageSize.getHeight() / 2,
                    pdfDoc.getPageNumber(page),
                    TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
            canvas.restoreState();
        }

        pdfDoc.close();

    }
}

例子4：改变页面大小和方向

我们读取一个带有ufo信息的PDF文档，改变每一页的大小，并使偶数页颠倒，代码如下：

import com.itextpdf.kernel.color.*;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.*;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;

import java.io.File;
import java.io.IOException;

/** * Simple changing page properties example. */
public class C05E04_ChangePage {

    public static final String SRC = "src/main/resources/pdf/ufo.pdf";
    public static final String DEST = "results/chapter05/change_page.pdf";

    public static void main(String args[]) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C05E04_ChangePage().manipulatePdf(SRC, DEST);
    }

    public void manipulatePdf(String src, String dest) throws IOException {

        //Initialize PDF document
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));

        float margin = 72;
        for (int i = 1; i <= pdfDoc.getNumberOfPages(); i++) {
            PdfPage page = pdfDoc.getPage(i);
            // change page size
            Rectangle mediaBox = page.getMediaBox();
            Rectangle newMediaBox = new Rectangle(mediaBox.getLeft() - margin, mediaBox.getBottom() - margin,
                    mediaBox.getWidth() + margin * 2, mediaBox.getHeight() + margin * 2);
            page.setMediaBox(newMediaBox);
            // add border
            PdfCanvas over = new PdfCanvas(page);
            over.setStrokeColor(Color.GRAY);
            over.rectangle(mediaBox.getLeft(), mediaBox.getBottom(), mediaBox.getWidth(), mediaBox.getHeight());
            over.stroke();
            // change rotation of the even pages
            if (i % 2 == 0) {
                page.setRotation(180);
            }
        }

        pdfDoc.close();

    }
}

Example代码下载

本章代码可在如下地址下载（IDEA工程）：iText7——第五章源代码工程

版权说明 : 本文为转载文章, 版权归原作者所有 版权申明

原文链接 : https://blog.csdn.net/u012397189/article/details/78559277

内容来源于网络，如有侵权，请联系作者删除！

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