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JDK1.4下实现访问WIN32注册表

2003-10-15 12:03 作者： peter 出处：论坛责任编辑：方舟

　　完整的示例

　　真的就这些。清单 3 为您提供了一个完整的示例来试验新功能（也可从参考资料下载）。程序运行后会自己清除，所以如果您想在注册表中找到值，请注释掉程序尾部的清除代码。

　　清单 3. 完整的示例

package net.zukowski.ibm;

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);
}
};

// Look up user root
Preferences prefs =
Preferences.userRoot().node("/net/zukowski/ibm");

// Add listeners
prefs.addNodeChangeListener(nodeChangeListener);
prefs.addPreferenceChangeListener(preferenceChangeListener);

// Save a bunch of key-value pairs
for (int i=0, n=denominations.length; i < n; i++) {
prefs.put(denominations[i], pictures[i]);
}

// Display all the entries
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);
}

// Create child
Preferences child = Preferences.userRoot().node("/net/zukowski/ibm/foo");

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

// Clean up
try {
prefs.removeNode();
} catch (BackingStoreException e) {
System.err.println("Unable to access backing store: " + e);
}

}
}

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