用java写一个autocad的二次开发代码

Autodesk提供了AutoCAD的二次开发工具包(AutoCAD Development Kit，简称ADK)，可以使用Java编写AutoCAD的二次开发代码。

以下是一个简单的示例，演示如何使用Java编写一个AutoCAD插件，该插件会在AutoCAD打开时打印一条消息：

1. 创建一个新的Java项目。
2. 将AutoCAD提供的Java库文件添加到项目中。这些库文件通常位于AutoCAD安装目录的“inc”文件夹中。
3. 在项目中创建一个新的类，例如“AutoCADPlugin”。
4. 在该类中添加以下代码：

import com.autodesk.autocad.application.*;
import com.autodesk.autocad.database.*;
import com.autodesk.autocad.editor.*;
import com.autodesk.autocad.runtime.*;

public class AutoCADPlugin implements IAcadApplicationEvents {
  
  public void appWillStart(Object[] arguments) {
    System.out.println("AutoCAD is starting up...");
  }

  public void appWillTerminate(Object[] arguments) {
    System.out.println("AutoCAD is shutting down...");
  }

  public boolean appUnload(IAcadApplication app) {
    return true;
  }

  public void beginOpenDocument(String fileName) {
  }

  public void documentBecameCurrent(IAcadDocument document) {
  }

  public void documentToBeActivated(String fileName) {
  }

  public void documentToBeClosed(IAcadDocument document) {
  }

  public void endOpenDocument(IAcadDocument document) {
  }

  public void endSaveDocument(IAcadDocument document) {
  }

  public void newDocumentCreated(IAcadDocument document) {
  }

  public void sysVarChanged(String sysVarName, Object newValue) {
  }

  public void beginCloseDocument(IAcadDocument document) {
  }

  public void beginSaveDocument(String fileName) {
  }

  public void beginQuit() {
  }

  public void lispWillStart(String firstLine) {
  }

  public void lispEnded() {
  }

  public void lispCancelled() {
  }

  public void objectErased(IAcadDatabase database, IAcadObject acadObject) {
  }

  public void objectModified(IAcadDatabase database, IAcadObject acadObject) {
  }

  public void objectOpenedForModify(IAcadDatabase database, IAcadObject acadObject) {
  }

  public void objectOpenedForRead(IAcadDatabase database, IAcadObject acadObject) {
  }

  public void objectReappended(IAcadDatabase database, IAcadObject acadObject) {
  }

  public void objectUnappended(IAcadDatabase database, IAcadObject acadObject) {
  }

  public void sysVarChanged2(String sysVarName, Object newValue, boolean propagate) {
  }

  public void sysVarChanged3(String sysVarName, Object newValue, boolean propagate, boolean success) {
  }

  public void systemVariableChanged(String sysVarName, Object newValue) {
  }

  public void systemVariableWillChange(String sysVarName, Object newValue) {
  }

  public void viewChanged(IAcadDatabase database, IAcadView acadView) {
  }

  public void viewToBeActivated(IAcadView acadView) {
  }

  public void viewToBeDeactivated(IAcadView acadView) {
  }

  public void workspaceChanged(String workspaceName) {
  }

  public static void main(String[] args) {
    IAcadApplication app = AcadApplication.getAcadApplication();
    app.addIAcadApplicationEvents(new AutoCADPlugin());
  }
}

5. 在AutoCAD中加载该插件。在AutoCAD中，打开命令行窗口，然后输入“netload”命令，然后选择Java项目的jar文件。
6. 打开AutoCAD，您应该会看到“AutoCAD is starting up...”消息。

要添加其他自定义功能，可以使用AutoCAD提供的Java库文件来访问AutoCAD对象模型。例如，要创建一个新的直线对象，请使用以下代码：

IAcadDatabase database = AcadApplication.getAcadApplication().getActiveDocument().getDatabase();
IAcadLine line = database.getAcadObjectFactory().createAcadLine(new double[] {0.0, 0.0, 0.0}, new double[] {10.0, 10.0, 0.0});
database.addAcadObject(line);

这将在当前文档中创建一条直线，从原点(0,0,0)到点(10,10,0)。