Eclipse RCP的插件中若想自定义首选项须要扩展扩展点：
org.eclipse.core.runtime.preferences //该扩展点用于初始化首选项中的值
org.eclipse.ui.preferencePages//该扩展点用于定义自己的首选项页面
plugin.xml中内容如：
Database Preferences挂在WorkFlowBase下。须要在category中填写workFlowBase的ID
WorkFlowPreferenceInitializer类。用于初始化首选项中的值
import org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer;import org.eclipse.jface.preference.IPreferenceStore;import mydesigner.WorkFlowActivator;/** * Class used to initialize default preference values. * 首选项的初始化 */public class WorkFlowPreferenceInitializer extends AbstractPreferenceInitializer { /* * (non-Javadoc) * * @see org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer#initializeDefaultPreferences() */ public void initializeDefaultPreferences() { IPreferenceStore store = WorkFlowActivator.getDefault().getPreferenceStore(); store.setDefault(WorkFlowPreferenceConstants.P_BOOLEAN, true); store.setDefault(WorkFlowPreferenceConstants.P_CHOICE, "choice2"); store.setDefault(WorkFlowPreferenceConstants.P_STRING,"Default value"); store.setDefault(WorkFlowPreferenceConstants.USER_NAME, "admin"); store.setDefault(WorkFlowPreferenceConstants.PASSWORD, "123456");//页面上的初始值 }}WorkFlowPreferenceConstants 该类定义了首选项中的常量 public class WorkFlowPreferenceConstants { public static final String P_PATH = "pathPreference"; public static final String P_BOOLEAN = "booleanPreference"; public static final String P_CHOICE = "choicePreference"; public static final String P_STRING = "stringPreference"; public static final String USER_NAME ="userName"; public static final String PASSWORD = "passWord"; }WorkFlowBasePreferencePage该类定义了首选项中的workFlow页面 import mydesigner.WorkFlowActivator;import org.eclipse.jface.preference.IPreferenceStore;import org.eclipse.jface.preference.PreferencePage;import org.eclipse.swt.SWT;import org.eclipse.swt.layout.GridData;import org.eclipse.swt.layout.GridLayout;import org.eclipse.swt.widgets.Button;import org.eclipse.swt.widgets.Composite;import org.eclipse.swt.widgets.Control;import org.eclipse.swt.widgets.Label;import org.eclipse.swt.widgets.Text;import org.eclipse.ui.IWorkbench;import org.eclipse.ui.IWorkbenchPreferencePage;import com.workflow.preferences.WorkFlowPreferenceConstants;/** * 首选项中的workFlow页面 * @author lww * */public class WorkFlowBasePreferencePage extends PreferencePage implements IWorkbenchPreferencePage{ private Text userName; //username private Text password; //密码框 public WorkFlowBasePreferencePage() { super(); setPreferenceStore(WorkFlowActivator.getDefault().getPreferenceStore()); setDescription("This is a workflowBase PreferencePage!"); } @Override public void init(IWorkbench workbench) { } //该方法为必须实现的方法，在此方法中创建页面上的各种控件 @Override protected Control createContents(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(new GridLayout(2, false)); //获取保存此页面的PreferenceStore对象 IPreferenceStore preferenceStore = getPreferenceStore(); new Label(composite, SWT.LEFT).setText("登录username:"); userName = new Text(composite, SWT.BORDER); userName.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); //设置username为保存在文件里的值 userName.setText(preferenceStore.getString(WorkFlowPreferenceConstants.USER_NAME)); new Label(composite, SWT.LEFT).setText("登陆password:"); password = new Text(composite, SWT.BORDER); password.setEchoChar('*'); //设置密码用*显示 password.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); //设置密码为保存在文件里的值 password.setText(preferenceStore.getString(WorkFlowPreferenceConstants.PASSWORD)); return composite; } /* * 覆盖父类中的方法。但单击“恢复默认值”button时调用该方法 */ protected void performDefaults() { IPreferenceStore preferenceStore = getPreferenceStore(); userName.setText( preferenceStore.getDefaultString(WorkFlowPreferenceConstants.USER_NAME)); password.setText( preferenceStore.getDefaultString(WorkFlowPreferenceConstants.PASSWORD)); } /* * 覆盖父类中的方法，但单击“应用”button时调用该方法 */ public boolean performOk() { IPreferenceStore preferenceStore = getPreferenceStore(); if (userName != null) preferenceStore.setValue(WorkFlowPreferenceConstants.USER_NAME, userName.getText()); if (password != null) preferenceStore.setValue(WorkFlowPreferenceConstants.PASSWORD, password.getText()); return true; } @Override//用于扩展自己的button protected void contributeButtons(Composite parent) { // super.contributeButtons(parent); Button bt1 = new Button(parent, SWT.NONE); bt1.setText("button一"); ((GridLayout) parent.getLayout()).numColumns++; Button bt2 = new Button(parent, SWT.NONE); bt2.setText("button二"); ((GridLayout) parent.getLayout()).numColumns++; } }DBPreferencePage该类定义了DB的首选项页面 import org.eclipse.jface.preference.*;import org.eclipse.ui.IWorkbenchPreferencePage;import org.eclipse.ui.IWorkbench;import com.workflow.preferences.WorkFlowPreferenceConstants;import mydesigner.WorkFlowActivator;public class DBPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage { public DBPreferencePage() { super(GRID); setPreferenceStore(WorkFlowActivator.getDefault().getPreferenceStore()); setDescription("A demonstration of a preference page implementation"); } /** * Creates the field editors. Field editors are abstractions of * the common GUI blocks needed to manipulate various types * of preferences. Each field editor knows how to save and * restore itself. */ public void createFieldEditors() { addField(new DirectoryFieldEditor(WorkFlowPreferenceConstants.P_PATH, "&Directory preference:", getFieldEditorParent())); addField( new BooleanFieldEditor( WorkFlowPreferenceConstants.P_BOOLEAN, "&An example of a boolean preference", getFieldEditorParent())); addField(new RadioGroupFieldEditor( WorkFlowPreferenceConstants.P_CHOICE, "An example of a multiple-choice preference", 1, new String[][] { { "&Choice 1", "choice1" }, { "C&hoice 2", "choice2" } }, getFieldEditorParent())); addField( new StringFieldEditor(WorkFlowPreferenceConstants.P_STRING, "A &text preference:", getFieldEditorParent())); } /* (non-Javadoc) * @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench) */ public void init(IWorkbench workbench) { } }运行结果如图： 
MyDesigner.prefs（MyDesigner是当前的插件名）
若要读取该文件里的值：
//获取首选项中的值 IPreferenceStore store = WorkFlowActivator.getDefault().getPreferenceStore(); System.out.println("username：" + store.getString(WorkFlowPreferenceConstants.USER_NAME)); System.out.println("密码：" + store.getString(WorkFlowPreferenceConstants.PASSWORD));//页面上的初始值 弹出相应的首选项对话框：
//将用户引导至首选项配置页面 PreferenceManager manager = PlatformUI.getWorkbench().getPreferenceManager(); Shell parentShell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(); PreferenceDialog pd = new PreferenceDialog(parentShell, manager); pd.setSelectedNode("com.workflow.preferences.page.DBPreferencePage");//设置选中的页面 (org.eclipse.ui.preferencePages 扩展点中page的ID) pd.open(); 
该对话框中没有搜索过滤栏。
还有一种实现：
PreferencesUtil.createPreferenceDialogOn(new Shell(), "com.workflow.preferences.page.DBPreferencePage", new String[]{"com.workflow.preferences.page.WorkFlowBasePreferencePage","com.workflow.preferences.page.DBPreferencePage"}, null).open(); 界面例如以下所看到的： 
上面的new string 数组參数主要定义左边显示哪些首页项节点栏，若为null，就显示全部的所选项