JAVA:如何从首选项页面访问文件路径并在编程代码中使用它

问题描述

我的 ProcessBuilder 类 ---

My ProcessBuilder class ---

 public class HelloWorldAction implements IWorkbenchWindowActionDelegate {
IWorkbenchWindow activeWindow = null;

public void run(IAction proxyAction) {

    MessageConsole myConsole = null;
    String name = "outputConsole";

    ConsolePlugin plugin = ConsolePlugin.getDefault();
    IConsoleManager conMan = plugin.getConsoleManager();
    IConsole[] existing = conMan.getConsoles();
    for (int i = 0; i < existing.length; i++)
       if (name.equals(existing[i].getName()))
           myConsole = (MessageConsole) existing[i];

      //no console found, so create a new one
    if (myConsole == null)
        myConsole = new MessageConsole(name, null);

    conMan.addConsoles(new IConsole[]{myConsole});

    IWorkbench wb = PlatformUI.getWorkbench();
    IWorkbenchWindow win = wb.getActiveWorkbenchWindow();
    IWorkbenchPage page = win.getActivePage();

    String id = IConsoleConstants.ID_CONSOLE_VIEW;
    try
    {
        IConsoleView view = (IConsoleView) page.showView(id);
        view.display(myConsole);

    }
    catch (Exception e)
    {

    }

    MessageConsoleStream out = myConsole.newMessageStream();
    out.println("Prism Button Works !");


    try {           //to clear the console on every click of button

        IViewPart view = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().findView(IConsoleConstants.ID_CONSOLE_VIEW);
        if (view != null) {
            (myConsole).clearConsole();
        }
        ProcessBuilder pb=new ProcessBuilder("C:\Program Files\prism-4.0\bin\prism.bat");
        pb.directory(new File("C:\Program Files\prism-4.0\bin"));
        Process p=pb.start();

        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));

        String in;
        while((in = input.readLine()) != null) {
            out.println(in);
        }


        int exitVal=p.waitFor();            

       if(exitVal==0)
       {
            out.println("Printing on console");

        }
       else
           out.println("Process failed");
    }
        catch (Exception e)
        {
            out.println(e.toString());
            e.printStackTrace();

        }
    } 
// IActionDelegate method
public void selectionChanged(IAction proxyAction, ISelection selection) {
    // do nothing, action is not dependent on the selection
}

// IWorkbenchWindowActionDelegate method
public void init(IWorkbenchWindow window) {
    activeWindow = window;

}

// IWorkbenchWindowActionDelegate method
public void dispose() {
    //  nothing to do
}

}

我的 FileFieldEditorClass

My FileFieldEditorClass

   public class SAML
extends FieldEditorPreferencePage
implements IWorkbenchPreferencePage {

public SAML() {
    super(GRID);
    setPreferenceStore(RmpPlugin.getDefault().getPreferenceStore());
    setDescription("Browse Appropriate files");
}

public FileFieldEditor f;
public FileFieldEditor f1;
public void createFieldEditors() {
        f=new FileFieldEditor(PreferenceConstants.P_PATH, 
            "&Prism.bat File:", getFieldEditorParent());
    addField(f);

    f1=new FileFieldEditor(PreferenceConstants.P_PATH1, 
            "&NuSMV Application File:", getFieldEditorParent());
    addField(f1);
}
public void init(IWorkbench workbench) {
}

}

FileFieldEditor 类在 com.myplugin.rmp.preferences 包中并且 ProcessBuilder 类在 com.myplugin.rmp 包中，

FileFieldEditor class is in com.myplugin.rmp.preferences package and ProcessBuilder class is in com.myplugin.rmp package,

现在建议我访问的方式.

Now suggest me the way to way to access.

推荐答案

在你构建 ProcessBuilder 的 try-block 中试试这个:

Try this inside your try-block where you construct your ProcessBuilder:

 IPreferenceStore store = plugin.getPreferenceStore();

 ProcessBuilder pb=new ProcessBuilder(store.getString(PreferenceConstants.P_PATH);
 pb.directory(new File(store.getString(PreferenceConstants.P_PATH1));
 Process p=pb.start();

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