该示例将详细讲述如何使用Spire.Presentation for Java在Java应用程序中为幻灯片设置纯色背景颜色，渐变背景颜色以及添加背景图片。

设置背景图片

import com.spire.presentation.*;
import com.spire.presentation.drawing.*;

public class PPTbackground {

    public static void main(String[] args) throws Exception {
        String inputFile = "Sample.pptx";
        String imageFile = "1.png";
        String outputFile = "output/setBackgroundColor.pptx";
        Presentation ppt = new Presentation();
        ppt.loadFromFile(inputFile);
        ppt.getSlides().get(0).getSlideBackground().setType(BackgroundType.CUSTOM);

//设置文档的背景填充模式为图片填充
        ppt.getSlides().get(0).getSlideBackground().getFill().setFillType(FillFormatType.PICTURE);
        ppt.getSlides().get(0).getSlideBackground().getFill().getPictureFill().setAlignment(RectangleAlignment.NONE);
        ppt.getSlides().get(0).getSlideBackground().getFill().getPictureFill().setFillType(PictureFillType.STRETCH);
        ppt.getSlides().get(0).getSlideBackground().getFill().getPictureFill().getPicture().setUrl((new java.io.File(imageFile)).getAbsolutePath());
        ppt.saveToFile(outputFile, FileFormat.PPTX_2010);
        ppt.dispose();
    }
}

设置纯色背景颜色

import com.spire.presentation.*;
import com.spire.presentation.drawing.*;

public class PPTbackground {

    public static void main(String[] args) throws Exception {
        String inputFile = "Sample.pptx";
        String outputFile = "output/setBackgroundColor.pptx";
        Presentation ppt = new Presentation();
        ppt.loadFromFile(inputFile);
        ppt.getSlides().get(0).getSlideBackground().setType(BackgroundType.CUSTOM);

//设置文档的背景填充模式为纯色填充，设置颜色
        ppt.getSlides().get(0).getSlideBackground().getFill().setFillType(FillFormatType.SOLID);
        ppt.getSlides().get(0).getSlideBackground().getFill().getSolidColor().setColor(java.awt.Color.LIGHT_GRAY);

        ppt.saveToFile(outputFile, FileFormat.PPTX_2010);
        ppt.dispose();
    }
}

设置渐变色背景颜色

import com.spire.presentation.*;
import com.spire.presentation.drawing.*;

import java.awt.*;

public class PPTbackground {

    public static void main(String[] args) throws Exception {
        String inputFile = "Sample.pptx";
        String outputFile = "output/setGradientColor.pptx";
        Presentation ppt = new Presentation();
        ppt.loadFromFile(inputFile);
        ppt.getSlides().get(0).getSlideBackground().setType(BackgroundType.CUSTOM);

//设置文档的背景填充模式为渐变色填充，设置颜色
        ppt.getSlides().get(0).getSlideBackground().getFill().setFillType(FillFormatType.GRADIENT);
        ppt.getSlides().get(0).getSlideBackground().getFill().getGradient().getGradientStops().append(0, Color.white);
        ppt.getSlides().get(0).getSlideBackground().getFill().getGradient().getGradientStops().append(1,Color.green);

        ppt.saveToFile(outputFile, FileFormat.PPTX_2010);
        ppt.dispose();
    }
}