我使用 Graphviz 和 GEF4 框架编写了这个 java 代码来显示一个简单的图形。重要的是，我也在 Eclipse 中使用 Window Builder。我创建了 SWT/JFace Java 项目，然后将其转换为插件项目。
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.SWT;
import org.eclipse.gef4.dot.DotImport;
import org.eclipse.gef4.graph.*;
import org.eclipse.gef4.zest.fx.*;
import org.eclipse.gef4.layout.*;
import org.eclipse.gef4.layout.algorithms.*;
public class Code1 {
public static void main(String[] args) {
Display display = Display.getDefault();
Shell shell = new Shell();
shell.setSize(450, 300);
shell.setText("SWT Application");
shell.setLayout(null);
Graph.Builder graph2 = new Graph.Builder().attr(ZestProperties.GRAPH_LAYOUT, new SpringLayoutAlgorithm());
new DotImport("digraph{1->2}").into(graph2);
new DotImport("node[label=zested]; 2->3; 2->4").into(graph2);
new DotImport("edge[style=dashed]; 3->5; 4->6").into(graph2);
//SpringLayoutAlgorithm SLA= new SpringLayoutAlgorithm();
graph2.build();
shell.open();
shell.layout();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
}
我有错误：
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/emf/ecore/resource/ResourceSet
at org.eclipse.gef4.dot.DotImport.load(DotImport.java:81)
at org.eclipse.gef4.dot.DotImport.loadFrom(DotImport.java:63)
at org.eclipse.gef4.dot.DotImport.init(DotImport.java:55)
at org.eclipse.gef4.dot.DotImport.<init>(DotImport.java:46)
at program2.Code2.main(Code2.java:24)
Caused by: java.lang.ClassNotFoundException: org.eclipse.emf.ecore.resource.ResourceSet
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more
我发现我需要在 Build Path 中添加构建路径（带有所需库的 jar 文件）。所以我加了。我还添加了所有依赖项。但它仍然不起作用。你有什么想法，我会错过什么吗？谢谢你的任何想法！