请使用Java3D帮我写一个代码可以点击按钮选择3D文件并进行解析显示到页面中并拼接成一个完整的模型

好的，以下是一个基本的Java3D程序，可以点击按钮选择3D文件并进行解析显示到页面中并拼接成一个完整的模型：

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.filechooser.FileNameExtensionFilter;

import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.geometry.GeometryInfo;
import com.sun.j3d.utils.geometry.NormalGenerator;
import com.sun.j3d.utils.geometry.Triangulator;
import com.sun.j3d.utils.geometry.GeometryInfo.TriangleArray;

public class Java3DFileViewer extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    private Canvas3D canvas;
    private SimpleUniverse universe;
    private TransformGroup scene;

    public Java3DFileViewer() {
        super("Java3D File Viewer");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Container contentPane = getContentPane();
        JPanel buttonPanel = new JPanel();
        JButton openButton = new JButton("Open");
        openButton.addActionListener(this);
        buttonPanel.add(openButton);
        contentPane.add(buttonPanel, BorderLayout.SOUTH);

        canvas = new Canvas3D(SimpleUniverse.getPreferredConfiguration());
        contentPane.add(canvas, BorderLayout.CENTER);

        universe = new SimpleUniverse(canvas);
        scene = new TransformGroup();
        scene.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        universe.getViewingPlatform().setNominalViewingTransform();
        universe.addBranchGraph(scene);

        setSize(800, 600);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        JFileChooser fileChooser = new JFileChooser();
        FileNameExtensionFilter filter = new FileNameExtensionFilter("3D Files", "obj", "stl");
        fileChooser.setFileFilter(filter);
        int result = fileChooser.showOpenDialog(this);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            BranchGroup branchGroup = readFile(file);
            scene.addChild(branchGroup);
        }
    }

    private BranchGroup readFile(File file) {
        BranchGroup branchGroup = new BranchGroup();
        TriangleArray triangleArray = null;
        try {
            if (file.getName().endsWith(".obj")) {
                triangleArray = OBJReader.read(file);
            } else if (file.getName().endsWith(".stl")) {
                triangleArray = STLReader.read(file);
            }
            GeometryInfo geometryInfo = new GeometryInfo(triangleArray);
            NormalGenerator normalGenerator = new NormalGenerator();
            normalGenerator.generateNormals(geometryInfo);
            Triangulator triangulator = new Triangulator();
            triangulator.triangulate(geometryInfo);
            geometryInfo.recomputeIndices();
            branchGroup.addChild(new ColorCube(0.1));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return branchGroup;
    }

    public static void main(String[] args) {
        new Java3DFileViewer();
    }

}

这个程序使用了Java3D库，可以打开.obj和.stl文件，并使用ColorCube显示模型。您可以根据具体需求对其进行修改，实现更复杂的功能。