Java 在 PDF 中添加表单域

PDF表单域是指用户在PDF文件中可以自主进行填写、选择等操作的区域，其主要目的是采集用户输入或选择的数据。常见的表单域包括文本框、单选按钮、复选框、列表框和组合框等。文本将介绍如何使用Free Spire.PDF for Java在Java程序中创建PDF表单域。

Jar文件导入方法
方法一：
下载Free Spire.PDF for Java包并解压缩，然后从lib文件夹下，将Spire.Pdf.jar包导入到你的Java应用程序中。（导入成功后如下图所示）

方法二：
通过Maven仓库安装导入。详细的操作步骤请参考链接:
https://www.e-iceblue.cn/licensing/install-spirepdf-for-java-from-maven-repository.html

Java代码示例

import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.fields.*;
import com.spire.pdf.graphics.*;


public class AddFormFieldsToPdf {

    public static void main(String[] args) throws Exception {

        //创建PdfDocument对象
        PdfDocument doc = new PdfDocument();

        //添加页面
        PdfPageBase page = doc.getPages().add();

        //初始化位置变量
        float baseX = 100;
        float baseY = 0;

        //创建画刷对象
        PdfSolidBrush brush1 = new PdfSolidBrush(new PdfRGBColor(Color.BLUE));
        PdfSolidBrush brush2 = new PdfSolidBrush(new PdfRGBColor(Color.black));

        //创建TrueType字体
        PdfTrueTypeFont font= new PdfTrueTypeFont(new Font("微软雅黑",Font.PLAIN,12),true);

        //添加文本框
        String text = "文本框:";//文本框前的文字
        page.getCanvas().drawString(text, font, brush1, new Point2D.Float(0, baseY));//在PDF中绘制文字
        Rectangle2D.Float tbxBounds = new Rectangle2D.Float(baseX, baseY , 150, 15);//创建Rectangle2D对象
        PdfTextBoxField textBox = new PdfTextBoxField(page, "TextBox");//创建文本框对象
        textBox.setBounds(tbxBounds);//设置文本框的Bounds,包括位置和大小信息
        textBox.setText("你好");//设置文本框的默认文字
        textBox.setFont(font);//设置文本框的字体
        doc.getForm().getFields().add(textBox);//添加文本框到PDF域的集合
        baseY +=25;

        //添加复选框
        page.getCanvas().drawString("复选框:", font, brush1, new Point2D.Float(0, baseY));
        java.awt.geom.Rectangle2D.Float rec1 = new java.awt.geom.Rectangle2D.Float(baseX, baseY, 15, 15);
        PdfCheckBoxField checkBoxField = new PdfCheckBoxField(page, "CheckBox1");
        checkBoxField.setBounds(rec1);
        checkBoxField.setChecked(false);
        page.getCanvas().drawString("选项1", font, brush2, new Point2D.Float(baseX + 20, baseY));
        java.awt.geom.Rectangle2D.Float rec2 = new java.awt.geom.Rectangle2D.Float(baseX + 70, baseY, 15, 15);
        PdfCheckBoxField checkBoxField1 = new PdfCheckBoxField(page, "CheckBox2");
        checkBoxField1.setBounds(rec2);
        checkBoxField1.setChecked(false);
        page.getCanvas().drawString("选项2", font,  brush2, new Point2D.Float(baseX+90, baseY));
        doc.getForm().getFields().add(checkBoxField);
        baseY += 25;

        //添加列表框
        page.getCanvas().drawString("列表框:", font, brush1, new Point2D.Float(0, baseY));
        java.awt.geom.Rectangle2D.Float rec = new java.awt.geom.Rectangle2D.Float(baseX, baseY, 150, 50);
        PdfListBoxField listBoxField = new PdfListBoxField(page, "ListBox");
        listBoxField.getItems().add(new PdfListFieldItem("项目1", "item1"));
        listBoxField.getItems().add(new PdfListFieldItem("项目2", "item2"));
        listBoxField.getItems().add(new PdfListFieldItem("项目3", "item3"));;
        listBoxField.setBounds(rec);
        listBoxField.setFont(font);
        listBoxField.setSelectedIndex(0);
        doc.getForm().getFields().add(listBoxField);
        baseY += 60;

        //添加单选按钮
        page.getCanvas().drawString("单选按钮:", font, brush1, new Point2D.Float(0, baseY));
        PdfRadioButtonListField radioButtonListField = new PdfRadioButtonListField(page, "Radio");
        PdfRadioButtonListItem radioItem1 = new PdfRadioButtonListItem("Item1");
        radioItem1.setBounds(new Rectangle2D.Float(baseX, baseY, 15, 15));
        page.getCanvas().drawString("选项1", font, brush2, new Point2D.Float(baseX + 20, baseY));
        PdfRadioButtonListItem radioItem2 = new PdfRadioButtonListItem("Item2");
        radioItem2.setBounds(new Rectangle2D.Float(baseX + 70, baseY, 15, 15));
        page.getCanvas().drawString("选项2", font, brush2, new Point2D.Float(baseX + 90, baseY));
        radioButtonListField.getItems().add(radioItem1);
        radioButtonListField.getItems().add(radioItem2);
        radioButtonListField.setSelectedIndex(0);
        doc.getForm().getFields().add(radioButtonListField);
        baseY += 25;

        //添加组合框
        page.getCanvas().drawString("组合框:", font, brush1, new Point2D.Float(0, baseY));
        Rectangle2D.Float cmbBounds = new Rectangle2D.Float(baseX, baseY, 150, 15);
        PdfComboBoxField comboBoxField = new PdfComboBoxField(page, "ComboBox");
        comboBoxField.setBounds(cmbBounds);
        comboBoxField.getItems().add(new PdfListFieldItem("项目1", "item1"));
        comboBoxField.getItems().add(new PdfListFieldItem("项目2", "itme2"));
        comboBoxField.getItems().add(new PdfListFieldItem("项目3", "item3"));
        comboBoxField.getItems().add(new PdfListFieldItem("项目4", "item4"));
        comboBoxField.setSelectedIndex(0);
        comboBoxField.setFont(font);
        doc.getForm().getFields().add(comboBoxField);
        baseY += 25;

        //添加签名域
        page.getCanvas().drawString("签名域:", font, brush1, new Point2D.Float(0, baseY));
        PdfSignatureField sgnField= new PdfSignatureField(page,"sgnField");
        Rectangle2D.Float sgnBounds = new Rectangle2D.Float(baseX, baseY, 150, 80);
        sgnField.setBounds(sgnBounds);
        doc.getForm().getFields().add(sgnField);
        baseY += 90;

        //添加按钮
        page.getCanvas().drawString("提交按钮:", font, brush1, new Point2D.Float(0, baseY));
        Rectangle2D.Float btnBounds = new Rectangle2D.Float(baseX, baseY, 50, 15);
        PdfButtonField buttonField = new PdfButtonField(page, "Button");
        buttonField.setBounds(btnBounds);
        buttonField.setText("提交");
        buttonField.setFont(font);
        doc.getForm().getFields().add(buttonField);

        //保存文档
        doc.saveToFile("AddFormField.pdf");
    }
}