Java Operations Registry

public class Register {Log a map message to the registrypublic void Recordregistration (map<string,string>entry) throws backingstoreexception{If the choice is systemnode ... is saved in [hkey_local_machine\software\javasoft\prefs]//Preferences pre = Preferences.systemnodeforpackage (registration        Op.class); If the choice is usernode ....        Then save in [Hkey_current_user\software\javasoft\prefs] Preferences pre = Preferences.usernodeforpackage (Register.class); You can also import an XML in the form of a stream//preferences.importpreferences (IS);if (entry!=null) {Set<string> Keys=entry.keyset ();Iterator<string> Its=keys.iterator ();while (Its.hasnext ()) {String Key=its.next ();String Value=entry.get (key);Pre.put (Key,value);}}Pre.flush ();}Query whether there is information logged in the registrypublic string Findinfo (string key) {Preferences now=preferences.usernodeforpackage (Register.class);String result=now.get (key, NULL);return result;}Delete the information for the corresponding key in the registrypublic void Delinfo (String key) {Preferences now =preferences.usernodeforpackage (Register.class);Now.remove (key);}} public class QQ {Register rg=new Register ();public String user;Public String pwd;protected shell shell;private text text;Private Text text_1; public static void Main (string[] args) {try {QQ window = new QQ ();window.open ();} catch (Exception e) {E.printstacktrace ();}} public void Open () {Display display = Display.getdefault ();Createcontents ();Shell.open ();Shell.layout ();while (!shell.isdisposed ()) {if (!display.readanddispatch ()) {Display.sleep ();}}} protected void createcontents () {Shell = new Shell ();Shell.setsize (450, 300);Shell.settext ("SWT application");Shell.setlayout (SWT. New Filllayout. horizontal));Composite Composite = new Composite (Shell, SWT. NONE);Label label = new label (composite, SWT. NONE);Label.setbounds (29, 28, 61, 17);Label.settext ("\u8d26\u53f7\uff1a");Label Label_1 = new label (composite, SWT. NONE);Label_1.setbounds (29, 92, 61, 17);Label_1.settext ("\u5bc6\u7801\uff1a");Text = new text (composite, SWT. BORDER);Text.setbounds (97, 25, 170, 23);text_1 = new Text (composite, SWT. BORDER | Swt. PASSWORD);Text_1.setbounds (97, 89, 170, 23);Final button button = New button (composite, SWT. CHECK);Button.setbounds (33, 163, 98, 17);Button.settext ("\u8bb0\u4f4f\u5bc6\u7801");Button button_1 = New button (composite, SWT. NONE);Button_1.setbounds (187, 158, 80, 27);Button_1.settext ("\u767b\u9646");String loginname=rg.findinfo ("user");String loingpwd=rg.findinfo ("pwd");To determine if a login exists in the registryif (loginname!=null&&! "". Equals (LoginName)) {Text.settext (Rg.findinfo ("user"));if (loingpwd!=null&&! "". Equals (LOINGPWD)) {//If the user exists, the user's password is readText_1.settext (Rg.findinfo ("pwd"));}}Button.setselection (TRUE);Login EventsButton_1.addselectionlistener (New Selectionadapter () {@Overridepublic void widgetselected (Selectionevent e) {Map<string,string> mapuser=new hashmap<string,string> ();Map<string,string> mappwd=new hashmap<string,string> ();String Uname=text.gettext (). toString (). Trim ();String Upwd=text_1.gettext (). toString (). Trim ();if (uname==null| | "". Equals (uname)) {ShowMessage ("User name cannot be empty ...");Text.setfocus ();Return}if (upwd==null| | "". Equals (Upwd)) {ShowMessage ("Password cannot be empty ...");Text_1.setfocus ();Return}Mapuser.put ("User", uname);Mappwd.put ("pwd", upwd);String str=rg.findinfo ("user");if (Button.getselection () ==true) {//If the user chooses to save the password, write to the registryif (str==null| | Str.length () ==0) {//If the user key corresponds to a value of NULLtry {Rg.recordregistration (Mapuser); Writing to the RegistryRg.recordregistration (MAPPWD);} catch (Backingstoreexception E1) {E1.printstacktrace ();}Shell.close ();Login l=new login ();L.open ();}else{Rg.delinfo ("user");Rg.delinfo ("pwd");try {Rg.recordregistration (Mapuser);Rg.recordregistration (MAPPWD);} catch (Backingstoreexception E2) {E2.printstacktrace ();}Shell.close ();Login l=new login ();L.open ();}}}});}public void ShowMessage (String message) {MessageBox mb=new MessageBox (SHELL,SWT. NONE);Mb.settext ("error Prompt");Mb.setmessage (message);Mb.open ();}}

Java Operations Registry