将Android SQLite db 文件转化成xml保存在xml

坏气十足

public class DatabaseAssistant
{
private static final String EXPORT_FILE_NAME = "/sdcard/export.xml";
private Context _ctx;
private SQLiteDatabase _db;
private Exporter _exporter;
public DatabaseAssistant( Context ctx, SQLiteDatabase db )
{
_ctx = ctx;
_db = db;
try
{
// create a file on the sdcard to export the
// database contents to
File myFile = new File( EXPORT_FILE_NAME );
myFile.createNewFile();
FileOutputStream fOut =  new FileOutputStream(myFile);
BufferedOutputStream bos = new BufferedOutputStream( fOut );
_exporter = new Exporter( bos );
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
public void exportData( )
{
log( "Exporting Data" );
try
{
_exporter.startDbExport( _db.getPath() );
// get the tables out of the given sqlite database
String sql = "SELECT * FROM sqlite_master";
Cursor cur = _db.rawQuery( sql, new String[0] );
Log.d("db", "show tables, cur size " + cur.getCount() );
cur.moveToFirst();
String tableName;
while ( cur.getPosition() < cur.getCount() )
{
tableName = cur.getString( cur.getColumnIndex( "name" ) );
log( "table name " + tableName );
// don't process these two tables since they are used
// for metadata
if ( ! tableName.equals( "android_metadata" ) &&
! tableName.equals( "sqlite_sequence" ) )
{
exportTable( tableName );
}
cur.moveToNext();
}
_exporter.endDbExport();
_exporter.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
private void exportTable( String tableName ) throws IOException
{
_exporter.startTable(tableName);
// get everything from the table
String sql = "select * from " + tableName;
Cursor cur = _db.rawQuery( sql, new String[0] );
int numcols = cur.getColumnCount();
log( "Start exporting table " + tableName );
//// logging
//for( int idx = 0; idx < numcols; idx++ )
//{
//log( "column " + cur.getColumnName(idx) );
//}
cur.moveToFirst();
// move through the table, creating rows
// and adding each column with name and value
// to the row
while( cur.getPosition() < cur.getCount() )
{
_exporter.startRow();
String name;
String val;
for( int idx = 0; idx < numcols; idx++ )
{
name = cur.getColumnName(idx);
val = cur.getString( idx );
log( "col '" + name + "' -- val '" + val + "'" );
_exporter.addColumn( name, val );
}
_exporter.endRow();
cur.moveToNext();
}
cur.close();
_exporter.endTable();
}
private void log( String msg )
{
Log.d( "DatabaseAssistant", msg );
}
class Exporter
{
private static final String CLOSING_WITH_TICK = "'>";
private static final String START_DB = "<export-database name='";
private static final String END_DB = "</export-database>";
private static final String START_TABLE = "<table name='";
private static final String END_TABLE = "</table>";
private static final String START_ROW = "<row>";
private static final String END_ROW = "</row>";
private static final String START_COL = "<col name='";
private static final String END_COL = "</col>";
private BufferedOutputStream _bos;
public Exporter() throws FileNotFoundException
{
this( new BufferedOutputStream(
_ctx.openFileOutput( EXPORT_FILE_NAME,
Context.MODE_WORLD_READABLE ) ) );
}
public Exporter( BufferedOutputStream bos )
{
_bos = bos;
}
public void close() throws IOException
{
if ( _bos != null )
{
_bos.close();
}
}
public void startDbExport( String dbName ) throws IOException
{
String stg = START_DB + dbName + CLOSING_WITH_TICK;
_bos.write( stg.getBytes() );
}
public void endDbExport() throws IOException
{
_bos.write( END_DB.getBytes() );
}
public void startTable( String tableName ) throws IOException
{
String stg = START_TABLE + tableName + CLOSING_WITH_TICK;
_bos.write( stg.getBytes() );
}
public void endTable() throws IOException
{
_bos.write( END_TABLE.getBytes() );
}
public void startRow() throws IOException
{
_bos.write( START_ROW.getBytes() );
}
public void endRow() throws IOException
{
_bos.write( END_ROW.getBytes() );
}
public void addColumn( String name, String val ) throws IOException
{
String stg = START_COL + name + CLOSING_WITH_TICK + val + END_COL;
_bos.write( stg.getBytes() );
}
}
class Importer
{
}


public String checkForIllegalChars(String val) {
String newStr = val;
if (newStr.contains(”&”)) { //make sure we do this check first
newStr = newStr.replaceAll(”&”, “&”);
}
if (newStr.contains(”<”)) {
newStr = newStr.replaceAll(”")) {
newStr = newStr.replaceAll(”>”, “>”);
}
if (newStr.contains(”\”")) {
newStr = newStr.replaceAll(”\”", “"”);
}
if (newStr.contains(”‘”)) {
newStr = newStr.replaceAll(”‘”, “&apos;”);
}
return newStr;
}

　　上面的代码是检查一下 有没有非法写入xml的字符。