How to create and fill PDF form fields in Java (code example)

The content of this article is about how to create and fill PDF form fields (code examples) in Java. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Form fields can be divided into many different types according to their uses. Common ones include text boxes, multi-line text boxes, password boxes, hidden fields, check boxes, radio buttons and drop-down selection boxes, etc. The purpose is to collect user input or selected data. In the following example, we will share how to add and fill form fields in PDF through Java programming. Filling the form fields here can be divided into two situations, one is filling when creating the form field, and the other is filling in the document that has already created the form field. In addition, for documents that have created form fields and filled them out, you can also set read-only to prevent modification and editing.

Summary of key points:

1. Create form fields

2. Fill in form fields

3.Set form fields read-only

Tools: Free Spire.PDF for Java v2.0.0 (free version)

JarFile import

Steps1:Create a new folder in the Java program and name it Lib. And copy the two jar files in the product package to the newly created folder.

Step 2:After copying the files, add them to the reference class library: Select these two jar files and right-click , select “Build Path” – “Add to Build Path”. Complete the citation.

JavaCode sample (for reference)

1.Create and fill PDFForm fields

import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import com.spire.pdf.FileFormat;
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，并添加页面
        PdfDocument doc = new PdfDocument();        
        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("Arial Unicode MS",Font.PLAIN,10),true); 

        //添加文本框
        String text = "姓名：";//添加文本
        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
        textBox.setText("刘兴");//填充文本框
        textBox.setFont(font);//应用文本框的字体
        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("所在院系：", 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");//创建第一个复选框对象
        checkBoxField.setBounds(rec1);
        checkBoxField.setChecked(false);//填充复选框
        page.getCanvas().drawString("经管系", 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");//创建第二个复选框对象
        checkBoxField1.setBounds(rec2);
        checkBoxField1.setChecked(true);//填充复选框
        page.getCanvas().drawString("创新班", font,  brush2, new Point2D.Float(baseX+90, baseY));      
        doc.getForm().getFields().add(checkBoxField);//添加复选框到PDF
        baseY += 25;

        //添加列表框
        page.getCanvas().drawString("录取批次：", 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");//创建列表框对象
        listBoxField.getItems().add(new PdfListFieldItem("第一批次", "item1"));
        listBoxField.getItems().add(new PdfListFieldItem("第二批次", "item2"));
        listBoxField.getItems().add(new PdfListFieldItem("第三批次", "item3"));;
        listBoxField.setBounds(rec);
        listBoxField.setFont(font);
        listBoxField.setSelectedIndex(0);//填充列表框
        doc.getForm().getFields().add(listBoxField);//添加列表框到PDF
        baseY += 60;

        //添加单选按钮
        page.getCanvas().drawString("招收方式：", font, brush1, new Point2D.Float(0, baseY));
        PdfRadioButtonListField radioButtonListField = new PdfRadioButtonListField(page, "Radio");//创建单选按钮对象
        PdfRadioButtonListItem radioItem1 = new PdfRadioButtonListItem("Item1");//创建第一个单选按钮
        radioItem1.setBounds(new Rectangle2D.Float(baseX, baseY, 15, 15));
        page.getCanvas().drawString("全日制", font, brush2, new Point2D.Float(baseX + 20, baseY));
        PdfRadioButtonListItem radioItem2 = new PdfRadioButtonListItem("Item2");//创建第二个单选按钮
        radioItem2.setBounds(new Rectangle2D.Float(baseX + 70, baseY, 15, 15));
        page.getCanvas().drawString("成人教育", font, brush2, new Point2D.Float(baseX + 90, baseY));
        radioButtonListField.getItems().add(radioItem1);
        radioButtonListField.getItems().add(radioItem2);
        radioButtonListField.setSelectedIndex(0);//选择填充第一个单选按钮
        doc.getForm().getFields().add(radioButtonListField);//添加单选按钮到PDF
        baseY += 25;

        //添加组合框
        page.getCanvas().drawString("最高学历：", font, brush1, new Point2D.Float(0, baseY));
        Rectangle2D.Float cmbBounds = new Rectangle2D.Float(baseX, baseY, 150, 15);//创建cmbBounds对象
        PdfComboBoxField comboBoxField = new PdfComboBoxField(page, "ComboBox");//创建comboBoxField对象
        comboBoxField.setBounds(cmbBounds);
        comboBoxField.getItems().add(new PdfListFieldItem("博士", "item1"));
        comboBoxField.getItems().add(new PdfListFieldItem("硕士", "itme2"));
        comboBoxField.getItems().add(new PdfListFieldItem("本科", "item3"));
        comboBoxField.getItems().add(new PdfListFieldItem("大专", "item4"));
        comboBoxField.setSelectedIndex(0);      
        comboBoxField.setFont(font);
        doc.getForm().getFields().add(comboBoxField);//添加组合框到PDF
        baseY += 25;

        //添加签名域
        page.getCanvas().drawString("本人签字确认\n以上信息属实：", font, brush1, new Point2D.Float(0, baseY));
        PdfSignatureField sgnField= new PdfSignatureField(page,"sgnField");//创建sgnField对象
        Rectangle2D.Float sgnBounds = new Rectangle2D.Float(baseX, baseY, 150, 80);//创建sgnBounds对象
        sgnField.setBounds(sgnBounds);          
        doc.getForm().getFields().add(sgnField);//添加sgnField到PDF
        baseY += 90;

        //添加按钮
        page.getCanvas().drawString("", font, brush1, new Point2D.Float(0, baseY));
        Rectangle2D.Float btnBounds = new Rectangle2D.Float(baseX, baseY, 50, 15);//创建btnBounds对象
        PdfButtonField buttonField = new PdfButtonField(page, "Button");//创建buttonField对象
        buttonField.setBounds(btnBounds);
        buttonField.setText("提交");//设置按钮显示文本
        buttonField.setFont(font);
        doc.getForm().getFields().add(buttonField);//添加按钮到PDF  
        
        //保存文档
        doc.saveToFile("result.pdf", FileFormat.PDF);              
    }
}

Create (fill) effect:

2.Load and populate the existing form field document

The test document is as follows:

import com.spire.pdf.FileFormat;
import com.spire.pdf.PdfDocument;
import com.spire.pdf.fields.PdfField;
import com.spire.pdf.widget.*;

public class FillFormField_PDF{
    public static void main(String[] args){
        
        //创建PdfDocument对象，并加载PDF文档
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("output.pdf");

        //获取文档中的域
        PdfFormWidget form = (PdfFormWidget) doc.getForm();        
        //获取域控件集合
        PdfFormFieldWidgetCollection formWidgetCollection = form.getFieldsWidget();

        //遍历域控件并填充数据
        for (int i = 0; i < formWidgetCollection.getCount(); i++) {
            
            PdfField field = formWidgetCollection.get(i);         
            if (field instanceof PdfTextBoxFieldWidget) {
                PdfTextBoxFieldWidget textBoxField = (PdfTextBoxFieldWidget) field;
                textBoxField.setText("吴 敏");
            }  
            if (field instanceof PdfCheckBoxWidgetFieldWidget) {
                PdfCheckBoxWidgetFieldWidget checkBoxField = (PdfCheckBoxWidgetFieldWidget) field;
                switch(checkBoxField.getName()){
                case "CheckBox1":
                    checkBoxField.setChecked(true);
                    break;
                case "CheckBox2":
                    checkBoxField.setChecked(true);
                    break;
                }
            }
            if (field instanceof PdfRadioButtonListFieldWidget) {
                PdfRadioButtonListFieldWidget radioButtonListField = (PdfRadioButtonListFieldWidget) field;
                radioButtonListField.setSelectedIndex(1);
            }
            if (field instanceof PdfListBoxWidgetFieldWidget) {
                PdfListBoxWidgetFieldWidget listBox = (PdfListBoxWidgetFieldWidget) field;
                listBox.setSelectedIndex(1);
            }
            
            if (field instanceof PdfComboBoxWidgetFieldWidget) {
                PdfComboBoxWidgetFieldWidget comboBoxField = (PdfComboBoxWidgetFieldWidget) field;
                comboBoxField.setSelectedIndex(1);
            }
        }
        
        //保存文档
        doc.saveToFile("FillFormFields.pdf", FileFormat.PDF);
    }
}

Filling effect:

3.Restrict form field editing (Read-only)

import com.spire.pdf.PdfDocument;

public class FieldReadonly_PDF {
    public static void main(String[] args) throws Exception {
    {
    //创建PdfDocument对象，并加载包含表单域的PDF文档
    PdfDocument pdf = new PdfDocument();
    pdf.loadFromFile("test.pdf");
    
        //将文档中的所有表单域设置为只读
        pdf.getForm().setReadOnly(true);
    
        //保存文档
       pdf.saveToFile("result.pdf");   
     }
  }

In the generated document, the form fields will not be editable and will be read-only

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