Add Traffic Lights Icons to Excel in Java

The traffic light icon in Excel is a conditional formatting mainly used to manage the progress and status of a project. In this article, you will learn how to programmatically add the traffic lights icons in Excel by using a free library--Free Spire.XLS for Java.

Import Jar Dependency (2 Method)

1# Download the free library and unzip it, then add the Spire.Xls.jar file to your project as dependency.
2# Directly add the jar dependency to maven project by adding the following configurations to the pom.xml.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>http://repo.e iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.xls.free</artifactId>
        <version>5.1.0</version>
    </dependency>
</dependencies>

Sample Code

import com.spire.xls.*;
import com.spire.xls.core.IConditionalFormat;
import com.spire.xls.core.spreadsheet.collections.XlsConditionalFormats;

import java.awt.*;

public class setTrafficLightsIcons {
    public static void main(String[] args) {
        //Create a workbook
        Workbook workbook = new Workbook();

        //Add a worksheet
        Worksheet sheet = workbook.getWorksheets().get(0);

        //Add data to cells
        sheet.getCellRange("A1").setText("Project Progress");
        sheet.getCellRange("A2").setNumberValue(0.95);
        sheet.getCellRange("A3").setNumberValue(0.5);
        sheet.getCellRange("A4").setNumberValue(0.1);
        sheet.getCellRange("A5").setNumberValue(0.9);
        sheet.getCellRange("A6").setNumberValue(0.7);
        sheet.getCellRange("A7").setNumberValue(0.6);

        //set number format for the cell range
        sheet.getCellRange("A2:A7").setNumberFormat("0%");

        //Set row height and column width for the cell range
        sheet.getAllocatedRange().setRowHeight(20);
        sheet.getAllocatedRange().setColumnWidth(25);

        //Add a conditional formatting
        XlsConditionalFormats conditional = sheet.getConditionalFormats().add();
        conditional.addRange(sheet.getAllocatedRange());
        IConditionalFormat format1 = conditional.addCondition();

        //Set the conditional format type, formula, comparison operator type and color
        format1.setFormatType(ConditionalFormatType.CellValue);
        format1.setFirstFormula("300");
        format1.setOperator(ComparisonOperatorType.Less);
        format1.setFontColor(Color.black);
        format1.setBackColor(Color.lightGray);

        //Add a conditional formatting of traffic lights icon to the cell range
        conditional.addRange(sheet.getAllocatedRange());
        IConditionalFormat format = conditional.addCondition();
        format.setFormatType(ConditionalFormatType.IconSet);
        format.getIconSet().setIconSetType(IconSetType.ThreeTrafficLights1);

        //Save to file
        workbook.saveToFile( "output/setTrafficLightsIcons.xlsx", ExcelVersion.Version2013);
    }
}