java读写windows注册表

import java.io.*;
import java.util.prefs.*;

public class Prefs {
public static void main(String args[]) {
String denominations[] = { "One", "Two", "Five", "Ten", "Twenty" };
String pictures[] = { "Washington", "Jefferson", "Lincoln", "Hamilton",
"Jackson" };

NodeChangeListener nodeChangeListener = new NodeChangeListener() {
public void childAdded(NodeChangeEvent event) {
Preferences parent = event.getParent();
Preferences child = event.getChild();
System.out.println(parent.name() + " has a new child "
+ child.name());
}

public void childRemoved(NodeChangeEvent event) {
Preferences parent = event.getParent();
Preferences child = event.getChild();
System.out.println(parent.name() + " lost a child "
+ child.name());
}
};

PreferenceChangeListener preferenceChangeListener = new PreferenceChangeListener() {
public void preferenceChange(PreferenceChangeEvent event) {
String key = event.getKey();
String value = event.getNewValue();
Preferences node = event.getNode();
System.out.println(node.name() + " now has a value of " + value
+ " for " + key);
}
};

// 设定需要根目录
Preferences prefs = Preferences.userRoot().node("/net/fubin/ibm");

// 添加监听
prefs.addNodeChangeListener(nodeChangeListener);
prefs.addPreferenceChangeListener(preferenceChangeListener);

// 保存一个束的键名和相应的值
for (int i = 0, n = denominations.length; i < n; i++) {
prefs.put(denominations[i], pictures[i]);
}

// 显示所有的键名字及值
try {
String keys[] = prefs.keys();
for (int i = 0, n = keys.length; i < n; i++) {
System.out.println(keys[i] + ": "
+ prefs.get(keys[i], "Unknown"));
}
} catch (BackingStoreException e) {
System.err.println("Unable to read backing store: " + e);
}

// 建立 子目录
Preferences child = Preferences.userRoot().node("/net/fubin/ibm/foo");

// 保存为XML文件
try {
FileOutputStream fos = new FileOutputStream("prefs.xml");
prefs.exportNode(fos);
} catch (Exception e) {
System.err.println("Unable to export nodes: " + e);
}

// 删除新生成的接点
try {
prefs.removeNode();
} catch (BackingStoreException e) {
System.err.println("Unable to access backing store: " + e);
}

}
}