package com.example;

import com.aspose.cad.Image;
import com.aspose.cad.ImageOptionsBase;
import com.aspose.cad.imageoptions.CadRasterizationOptions;
import com.aspose.cad.imageoptions.JpegOptions;

public class Main {
    public static void main(String[] args) throws Exception {
        // Define the working directory path.
        String dataDir = "/sample-files/";
        
        // Load the source DWG file.
        Image sourceImage = Image.load(dataDir + "sample.dwg");
        
        // Create an object of the JpegOptions for the resultant image.
        ImageOptionsBase jpegOptions = new JpegOptions();
        
        // Instantiate an instance of the CadRasterizationOptions to enable CAD rasterization options.
        CadRasterizationOptions rasterOptions = new CadRasterizationOptions();
        
        // Set whether the background color is not equal to the default background color of the output format.
        rasterOptions.setEmbedBackground(true);
        
        // Set page width and height.
        rasterOptions.setPageWidth(900);
        rasterOptions.setPageHeight(900);
        
        // Define rasterization options.
        jpegOptions.setVectorRasterizationOptions(rasterOptions);
        
        // Save the resultant JPG image on the disk.
        sourceImage.save(dataDir + "dwg-to-jpg.jpg", jpegOptions);
    }
}

<dependency>
    <groupId>org.qcad</groupId>
    <artifactId>qcad</artifactId>
    <version>3.24.0</version>
</dependency>

import org.qcad.cadcore.Application;
import org.qcad.cadcore.Database;
import org.qcad.cadcore.Document;
import org.qcad.cadcore.Entity;
import org.qcad.cadcore.EntityIterator;
import org.qcad.cadcore.Layer;
import org.qcad.cadcore.LayerIterator;
import org.qcad.cadcore.Property;
import org.qcad.cadcore.PropertyIterator;
import org.qcad.cadcore.Rectangle;
import org.qcad.cadcore.Vector;
import org.qcad.cadcore.Viewport;
import org.qcad.cadcore.ViewportData;
import org.qcad.graphics.GraphicsContext;
import org.qcad.graphics.GraphicsView;
import org.qcad.graphics.ImageOutputFormat;
import org.qcad.graphics.ImageOutputOptions;
import org.qcad.graphics.Painter;
import org.qcad.io.DxfImporter;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class DwgToPngConverter {

    public static void convertDwgToPng(String dwgFilePath, String pngFilePath) {
        // 初始化 QCAD 應(yīng)用程序
        Application.init();

        // 創(chuàng)建數(shù)據(jù)庫
        Database database = new Database();

        // 導(dǎo)入 DWG 文件到數(shù)據(jù)庫
        DxfImporter importer = new DxfImporter();
        try {
            importer.readFile(dwgFilePath, database);
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }

        // 創(chuàng)建文檔
        Document document = new Document(database);

        // 獲取模型空間
        EntityIterator modelSpaceEntities = document.queryModelSpace();

        // 創(chuàng)建圖形視圖
        GraphicsView graphicsView = new GraphicsView();

        // 設(shè)置視圖范圍
        Rectangle extents = document.getExtents();
        graphicsView.setZoomToFit(extents);

        // 創(chuàng)建圖形上下文
        GraphicsContext graphicsContext = new GraphicsContext();

        // 設(shè)置圖像輸出格式和選項(xiàng)
        ImageOutputFormat outputFormat = ImageOutputFormat.PNG;
        ImageOutputOptions outputOptions = new ImageOutputOptions();

        // 創(chuàng)建畫家
        Painter painter = new Painter(graphicsContext, graphicsView);

        // 繪制實(shí)體到圖形上下文
        while (modelSpaceEntities.hasNext()) {
            Entity entity = modelSpaceEntities.next();
            painter.drawEntity(entity);
        }

        // 獲取繪制好的圖像
        BufferedImage image = graphicsContext.getImage();

        // 保存圖像為 PNG 文件
        try {
            ImageIO.write(image, "png", new File(pngFilePath));
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 清理資源
        Application.exit();
    }

    public static void main(String[] args) {
        String dwgFilePath = "input.dwg";
        String pngFilePath = "output.png";
        convertDwgToPng(dwgFilePath, pngFilePath);
    }
}