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：
设置的值会保存到
runtime-myDesigner.product\.metadata\.plugins\org.eclipse.core.runtime\.settings中会生成文件
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