Implementation database of Java IO stream

http://www.verejava.com/?id=16994748096921

Package Com.database;import Java.io.bytearrayinputstream;import Java.io.bytearrayoutputstream;import Java.io.datainputstream;import Java.io.dataoutputstream;import Java.io.ioexception;import Java.util.Iterator; public class testdatabase{public static void Testadd () {try {Databasestore ds=databasest                        Ore.opendatabase ("test.db");            Bytearrayoutputstream baos=new Bytearrayoutputstream ();            DataOutputStream dos=new DataOutputStream (BAOs);            Dos.writeint (30);            Dos.writeboolean (TRUE);            Dos.writedouble (100.5);                        Dos.writeutf ("Li June");        Ds.addrecord (Baos.tobytearray ());        } catch (IOException e) {e.printstacktrace (); }} public static void Testupdate () {try {Databasestore DS=DATABASESTORE.O                        Pendatabase ("test.db");          Bytearrayoutputstream baos=new Bytearrayoutputstream ();  DataOutputStream dos=new DataOutputStream (BAOs);            Dos.writeint (30);            Dos.writeboolean (TRUE);            Dos.writedouble (200.5);                        Dos.writeutf ("Zhang Shan");        Ds.setrecord (2, Baos.tobytearray ());        } catch (IOException e) {e.printstacktrace ();                }} public static void Testdelete () {Databasestore ds=databasestore.opendatabase ("test.db");            Ds.deleterecord (3);        } public static void Testget () {Databasestore ds=databasestore.opendatabase ("test.db");        Iterator<record> iter=ds.getrecords ();                try {while (Iter.hasnext ()) {Record record=iter.next ();                Bytearrayinputstream bais=new Bytearrayinputstream (Record.getdata ());                    DataInputStream dis=new DataInputStream (Bais); System.out.println (Record.getid () + "," +dis.readint () + "," +dis.readboolean () + "," +diS.readdouble () + "," +dis.readutf ());        }} catch (IOException e) {e.printstacktrace ();        }} public static void Main (string[] args) {testdelete ();    Testget ();    }}package Com.database;import Java.io.serializable;public class Record implements serializable{private int id;        Private byte[] data;        public Record (int ID, byte[] data) {super ();        This.id = ID;    This.data = data;    } public int getId () {return id;    } public void setId (int id) {this.id = ID;    } public byte[] GetData () {return data;    } public void SetData (byte[] data) {this.data = data; }}package com.database;import Java.io.file;import java.io.fileinputstream;import java.io.FileNotFoundException;imp ORT Java.io.fileoutputstream;import Java.io.ioexception;import Java.io.objectinputstream;import Java.io.objectoutputstream;import Java.io.serializable;importJava.util.arraylist;import Java.util.iterator;import Java.util.list;public class Databasestore implements    serializable{private static String DatabasePath;    private static Databasestore Ds=null;        private int id;//Auto-growth ID private list<record> recordlist;    Private Databasestore () {recordlist=new arraylist<record> (); } public static Databasestore OpenDatabase (String databaseName) {databasepath=system.getproperty ("USER.D        IR ") +"/"+databasename;        File File=new file (DatabasePath);            if (!file.exists ()) {ds=new databasestore ();        WriteObject ();        } ds=readobject ();    return DS;        } public boolean AddRecord (byte[] data) {ds.id++;        Ds.recordList.add (New Record (ds.id, data));    return WriteObject ();            } public boolean Setrecord (int id,byte[] data) {for (int i=0;i<ds.recordlist.size (); i++) { Record Record=ds.recoRdlist.get (i);                if (Record.getid () ==id) {record.setdata (data);            return WriteObject ();    }} return false;    } public iterator<record> GetRecords () {return ds.recordList.iterator (); } public boolean deleterecord (int id) {for (int i=0;i<ds.recordlist.size (); i++) {R            Ecord Record=ds.recordlist.get (i);                if (Record.getid () ==id) {ds.recordList.remove (i);            return WriteObject ();    }} return false;        } public static Boolean WriteObject () {ObjectOutputStream oos=null;            try {oos=new ObjectOutputStream (new FileOutputStream (New File (DatabasePath)));            Oos.writeobject (DS);            Oos.flush ();        return true;        } catch (FileNotFoundException e) {e.printstacktrace ();       } catch (IOException e) {E.printstacktrace ();            } finally {try {oos.close ();            } catch (IOException e) {e.printstacktrace ();    }} return false;        } public static Databasestore ReadObject () {ObjectInputStream ois=null;            try {ois=new ObjectInputStream (new FileInputStream (New File (DatabasePath)));            Ds= (Databasestore) ois.readobject ();        return DS;        } catch (FileNotFoundException e) {e.printstacktrace ();        } catch (IOException e) {e.printstacktrace ();        } catch (ClassNotFoundException e) {e.printstacktrace ();            } finally {try {ois.close ();            } catch (IOException e) {e.printstacktrace ();    }} return null; }}

http://www.verejava.com/?id=16994748096921

Implementation database of Java IO stream