java 操作登錄檔
一、 使用JDK提供的Preferences類
首先得到Preferences的一個物件,這個物件就規定了你要在登錄檔的哪個位置寫入資訊,即節點.然後再用put(String key,String value)或者putInt(),tDouble()...等來給有關項賦值。下面是Demo程式。 Java程式碼
- import java.util.prefs.*;
- publicclass Registery {
- String[] keys = {"version", "initial", "creator"};
- String[] values = {"1.3"
- //把相應的值儲存到變數中去
- publicvoid writeValue() {
- // HKEY_LOCAL_MACHINE/Software/JavaSoft/prefs下寫入登錄檔值.
- Preferences pre = Preferences.systemRoot().node("/javaplayer");
- for (int i = 0; i < keys.length; i++) {
- pre.put(keys, values);
- }
- }
- publicstaticvoid main(String[] args) {
- Registery reg = new Registery();
- reg.writeValue();
- }
- }
import java.util.prefs.*;
public class Registery {
String[] keys = {"version", "initial", "creator"};
String[] values = {"1.3", "ini.mp3", "[email protected] "};
//把相應的值儲存到變數中去
public void writeValue() {
// HKEY_LOCAL_MACHINE/Software/JavaSoft/prefs下寫入登錄檔值.
Preferences pre = Preferences.systemRoot().node("/javaplayer");
for (int i = 0; i < keys.length; i++) {
pre.put(keys, values);
}
}
public static void main(String[] args) {
Registery reg = new Registery();
reg.writeValue();
}
}
執行上面的程式碼則在登錄檔的HKEY_LOCAL_MACHINE/Software/JavaSoft/prefs/javaplayer項下寫入了有關值.
最後再說明幾點:
1:你的節點的首字母不要大寫,不然在登錄檔中的項前就加了一個“/”;
2:登錄檔中的值也可以匯入到一個XML檔案中,具體方法見有關文件.
3:如果把程式碼中的Preferences pre = Preferences.systemRoot().node("/javaplayer"); 換成Preferences pre = Preferences.userRoot().node("/javaplayer");則相應的 HKEY_LOCAL_MACHINE就成為HKEY_LOCAL_USER。
二、 用jRegistry 來操作登錄檔
jRegistry它是用JNI來封裝WINDOWS登錄檔API,方便了java開發者訪問windows登錄檔。首先介紹一下jRegistryKey.jar和jRegistryKey.dll,這兩個檔案是使用jRegistry來操作登錄檔所必需的檔案:一個是jar包,是一個包括了java類的檔案;一個是動態連結庫檔案,提供了訪問登錄檔所需的原生代碼(即C/C++)。
下面詳細介紹一下使用流程:
1、 在JBuilder的選單Project->Project Properties->Required Libraries中新增jRegistryKey.jar或在環境變數classpath中新增該jar檔案;
2、 將jRegistryKey.dll放在工程的當前目錄下;
3、 在訪問登錄檔類中import該語句:import ca.beq.util.win32.registry.*; 該包中有兩個類:RegistryKey和RegistryValue。其中RegistryKey是登錄檔鍵的java表示,它提供了creat()和delete()方法建立和刪除key,列舉子鍵和值,set和get鍵的值等;RegistryValue is the Java? representation of a registry value (defined as a name, a type, and data).
4、 建立一個新key:
- RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
- r.create();
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
r.create();
5、建立一個子鍵:
- RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software");
- r.createSubkey("BEQ Technologies");
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software");
r.createSubkey("BEQ Technologies");
6、刪除一個已存在的鍵值:
try {
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
r.delete();
} // try
catch(RegistryException re) {
re.printStackTrace();
} // catch
7、列舉子鍵:
- RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software");
- if(r.hasSubkeys()) {
- Iterator i = r.subkeys();
- while(i.hasNext()) {
- RegistryKey x = (RegistryKey)i.next();
- System.out.println(x.toString());
- } // while
- } // if
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software");
if(r.hasSubkeys()) {
Iterator i = r.subkeys();
while(i.hasNext()) {
RegistryKey x = (RegistryKey)i.next();
System.out.println(x.toString());
} // while
} // if
8、讀登錄檔中鍵的值:
- RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
- if(r.hasValue("myValue")) {
- RegistryValue v = r.getValue("myValue");
- System.out.println(v.toString());//
- } // if
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
if(r.hasValue("myValue")) {
RegistryValue v = r.getValue("myValue");
System.out.println(v.toString());//
} // if
注:v.toString()僅是鍵myValue對應的鍵值,若要得到myValue鍵對應的值資料,則需要String str = v.getDate().toSting();
9、設定登錄檔中鍵的值:
- RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
- RegistryValue v = new RegistryValue("myVal", ValueType.REG_SZ, "data");
- r.setValue(v);
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
RegistryValue v = new RegistryValue("myVal", ValueType.REG_SZ, "data");
r.setValue(v);
10、列舉某鍵的所有值:
- RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software");
- if(r.hasValues()) {
- Iterator i = r.values();
- while(i.hasNext()) {
- RegistryValue v = (RegistryValue)i.next();
- System.out.println(v.toString());
- } // while
- } // if
RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software");
if(r.hasValues()) {
Iterator i = r.values();
while(i.hasNext()) {
RegistryValue v = (RegistryValue)i.next();
System.out.println(v.toString());
} // while
} // if
下面是一個demo程式,僅供參考。
- // create a new key, "Test", under HKLM
- RegistryKey r = new RegistryKey(RootKey.HKEY_LOCAL_MACHINE, "Test");
- if(!r.exists()) {
- r.create();
- } // if
- // create value entries
- RegistryValue v = new RegistryValue("aString", ValueType.REG_SZ, "test");
- r.setValue(v);
- v.setName("aDword");
- v.setType(ValueType.REG_DWORD);
- v.setData(new Integer(0x1001001));
- r.setValue(v);
- // read value entries
- Iterator i = r.values();
- while(i.hasNext()) {
- v = (RegistryValue)i.next();
- System.out.println(v.toString());
- } // while
- // delete registry key
- r.delete();