市场上J2ME的应用程序太多了。而Android。又是刚出产的东西，所以很多东西不完善等。虽然Android不支持J2me，但是Android提
供了Java开发接口，所以用这些APIs模拟一个J2ME也不是难事，今天我就试着模拟一个J2ME的JSR75的文件管理。
废话不说了，具体看下代码
这个是部分实现JSR75
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
public class FileConnectionImpl implements FileConnection {
File iFile;
final static int AVAILABLE_SIZE = 1024*1024*100;
FileConnectionImpl(String sPath) throws IOException{
iFile = new File(sPath);
if(!iFile.exists())
throw new IOException("File not exists!");
}
public long availableSize() {
return AVAILABLE_SIZE;
}
public boolean canRead() {
return iFile.canRead();
}
public boolean canWrite() {
return iFile.canWrite();
}
public void create() throws IOException {
iFile.createNewFile();
}
public void delete() throws IOException {
iFile.delete();
}
public long directorySize(boolean _boolean) throws IOException {
return 0;
}
public boolean exists() {
return iFile.exists();
}
public long fileSize() throws IOException {
return iFile.length();
}
public String getName() {
return iFile.getName();
}
public String getPath() {
return iFile.getPath();
}
public String getURL() {
return ConnectionBaseInterface.FILE_PROTOCOL +this.getPath() + ConnectionBaseInterface.SEPARATOR
+ this.getName();
}
public boolean isDirectory() {
return iFile.isDirectory();
}
public boolean isHidden() {
return iFile.isHidden();
}
public boolean isOpen() {
return iFile.isAbsolute();
}
public long lastModified() {
return iFile.lastModified();
}
public Enumeration list() throws IOException {
return new StringEnumeration(iFile.listFiles());
}
public Enumeration list(String string, boolean _boolean) throws IOException {
// TODO Auto-generated method stub
return null;
}
public void mkdir() throws IOException {
if( !iFile.mkdir() )
throw new IOException("mkdir faile!");
}
public DataInputStream openDataInputStream() throws IOException {
DataInputStream sIS = new DataInputStream(new FileInputStream(iFile));
return sIS;
}
public DataOutputStream openDataOutputStream() throws IOException {
DataOutputStream sIS = new DataOutputStream(new FileOutputStream(iFile));
return sIS;
}
public InputStream openInputStream() throws IOException {
return new FileInputStream(iFile);
}
public OutputStream openOutputStream() throws IOException {
return new FileOutputStream(iFile);
}
public OutputStream openOutputStream(long _long) throws IOException {
// TODO Auto-generated method stub
return null;
}
public void rename(String rename) throws IOException {
iFile.renameTo(new File(rename));
}
public void setFileConnection(String string) throws IOException {
// TODO Auto-generated method stub
}
public void setHidden(boolean aboolean) throws IOException {
//iFile.se
}
public void setReadable(boolean aboolean) throws IOException {
if(!aboolean)
iFile.setReadOnly();
}
public void setWritable(boolean aboolean) throws IOException {
// if(!aboolean)
// iFile.
}
public long totalSize() {
return iFile.length();
}
public void truncate(long _long) throws IOException {
}
public long usedSize() {
return 0;
}
public void close() throws IOException {
iFile = null;
}
}
连接工厂实现
public class ConnectionBaseInterface {
final static String FILE_PROTOCOL = "file://";
final static String SEPARATOR = System.getProperty("file.separator");
public final static Connection openPrim(String name, int mode, boolean timeouts)
throws IOException{
if(name.startsWith(FILE_PROTOCOL))
return new FileConnectionImpl(name.substring(6, name.length()));
return null;
}
}
class StringEnumeration implements Enumeration{
String[] iValues;
boolean hasMore;
int index;
StringEnumeration(String[] aStrings){
iValues = aStrings;
if(iValues != null && iValues.length>1)
hasMore = true;
}
StringEnumeration(File[] aFiles){
if(aFiles == null)
return;
iValues = new String[aFiles.length];
int i=0;
for (File file : aFiles){
iValues = file.getPath();
i++;
}
//iValues = aStrings;
if(iValues != null && iValues.length>1)
hasMore = true;
}
public boolean hasMoreElements() {
return hasMore;
}
public Object nextElement() {
if(iValues == null)
return null;
String value;
if(index >= 0 && index<iValues.length){
if(index == iValues.length)
hasMore = false;
value = iValues[index];
index++;
return value;
}else{
hasMore = false;
return null;
}
}
}
系统工厂实现
/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* This class is a placeholder for the static methods that are used
* for creating all the Connection objects.
* <p>
* The creation of Connections is performed dynamically by looking
* up a protocol implementation class whose name is formed from the
* platform name (read from a system property) and the protocol name
* of the requested connection (extracted from the parameter string
* supplied by the application programmer.)
*
* The parameter string that describes the target should conform
* to the URL format as described in RFC 2396.
* This takes the general form:
* <p>
* <code>{scheme}:[{target}][{parms}]</code>
* <p>
* where <code>{scheme}</code> is the name of a protocol such as
* <i>http</i>}.
* <p>
* The <code>{target}</code> is normally some kind of network
* address.
* <p>
* Any <code>{parms}</code> are formed as a series of equates
* of the form ";x=y". Example: ";type=a".
* <p>
* An optional second parameter may be specified to the open
* function. This is a mode flag that indicates to the protocol
* handler the intentions of the calling code. The options here
* specify if the connection is going to be read (READ), written
* (WRITE), or both (READ_WRITE). The validity of these flag
* settings is protocol dependent. For instance, a connection
* for a printer would not allow read access, and would throw
* an IllegalArgumentException. If the mode parameter is not
* specified, READ_WRITE is used by default.
* <p>
* An optional third parameter is a boolean flag that indicates
* if the calling code can handle timeout exceptions. If this
* flag is set, the protocol implementation may throw an
* InterruptedIOException when it detects a timeout condition.
* This flag is only a hint to the protocol handler, and it
* does not guarantee that such exceptions will actually be thrown.
* If this parameter is not set, no timeout exceptions will be
* thrown.
* <p>
* Because connections are frequently opened just to gain access
* to a specific input or output stream, four convenience
* functions are provided for this purpose.
*
* See also: {@link DatagramConnection DatagramConnection}
* for information relating to datagram addressing
*
* @version 1.1 1/7/2000
* @version 1.2 12/8/2000 (comments revised)
*/
public class Connector {
/*
* Implementation note: The open parameter is used for dynamically
* constructing a class name in the form:
* <p>
* <code>com.sun.cldc.io.{platform}.{protocol}.Protocol</code>
* <p>
* The system property "microedition.protocolpath" can be used to
* change the root of the class space that is used for looking
* up the protocol implementation classes.
* <p>
* The protocol name is derived from the parameter string
* describing the target of the connection. This takes the from:
* <p>
* <code> {protocol}:[{target}][ {parms}] </code>
* <p>
* The protocol name is used for dynamically finding the
* appropriate protocol implementation class. This information
* is stripped from the target name that is given as a parameter
* to the open() method.
*/
/**
* Access mode READ.
*/
public final static int READ = 1;
/**
* Access mode WRITE.
*/
public final static int WRITE = 2;
/**
* Access mode READ_WRITE.
*/
public final static int READ_WRITE = (READ|WRITE);
/**
* The platform name.
*/
private static String platform;
/**
* The root of the classes.
*/
private static String classRoot;
/**
* Class initializer.
*/
static {
/* Set up the platform name */
platform = System.getProperty("microedition.platform");
if (platform == null) {
platform = "j2me";
}
/* See if there is an alternate protocol class root path */
classRoot = System.getProperty("javax.microedition.io.Connector.protocolpath");
if (classRoot == null) {
classRoot = "com.sun.cldc.io";
}
}
/**
* Prevent instantiation of this class.
*/
private Connector(){}
/**
* Create and open a Connection.
*
* @param name The URL for the connection.
* @return A new Connection object.
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the requested connection
* cannot be make, or the protocol type does not exist.
* @exception IOException If some other kind of I/O error occurs.
*/
public static Connection open(String name) throws IOException {
return open(name, READ_WRITE);
}
/**
* Create and open a Connection.
*
* @param name The URL for the connection.
* @param mode The access mode.
* @return A new Connection object.
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the requested connection
* cannot be make, or the protocol type does not exist.
* @exception IOException If some other kind of I/O error occurs.
*/
public static Connection open(String name, int mode)
throws IOException {
return open(name, mode, false);
}
/**
* Create and open a Connection.
*
* @param name The URL for the connection
* @param mode The access mode
* @param timeouts A flag to indicate that the caller
* wants timeout exceptions
* @return A new Connection object
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException if the requested connection
* cannot be make, or the protocol type does not exist.
* @exception IOException If some other kind of I/O error occurs.
*/
public static Connection open(String name, int mode, boolean timeouts)
throws IOException {
try {
return openPrim(name, mode, timeouts);
} catch(ClassNotFoundException x ) {
}
throw new ConnectionNotFoundException( "The requested protocol does not exist "+name);
}
/**
* Create and open a Connection.
*
* @param string The URL for the connection
* @param mode The access mode
* @param timeouts A flag to indicate that the caller
* wants timeout exceptions
* @return A new Connection object
*
* @exception ClassNotFoundException If the protocol cannot be found.
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the connection cannot
* be found.
* @exception IOException If some other kind of I/O error occurs.
* @exception IllegalArgumentException If a parameter is invalid.
*/
private static Connection openPrim(String name, int mode,
boolean timeouts)
throws IOException, ClassNotFoundException {
/* Test for null argument */
if (name == null) {
throw new IllegalArgumentException( "Null URL");
}
/* Look for : as in "http:", "file:", or whatever */
int colon = name.indexOf(':');
/* Test for null argument */
if (colon < 1) {
throw new IllegalArgumentException("no ':' in URL"
);
}
// try {
String protocol;
/* Strip off the protocol name */
protocol = name.substring(0, colon);
/* sanity check the protocol name */
char[] chars = protocol.toCharArray();
for (int i = 0; i < chars.length; ++i) {
char c = chars;
/* only allow characters that are valid in RFC 2396
alpha *( alpha | digit | "+" | "-" | "." )
*/
if ( ('A' <= c && c <= 'Z') ||
('a' <= c && c <= 'z') ||
( (i > 0) && (
('0' <= c && c <= '9') ||
c == '+' ||
c == '-' ||
c == '.'))) {
continue;
}
throw new IllegalArgumentException("Invalid protocol name");
}
/* Strip the protocol name from the rest of the string */
name = name.substring(colon+1);
/* Use the platform and protocol names to look up */
/* a class to implement the connection */
// Class clazz =
// Class.forName(classRoot +
// "." + platform +
// "." + protocol + ".Protocol");
//
// /* Construct a new instance */
// ConnectionBaseInterface uc =
// (ConnectionBaseInterface)clazz.newInstance();
/* Open the connection, and return it */
return ConnectionBaseInterface.openPrim(name, mode, timeouts);
}
// catch (ClassCastException x) {
// throw new IOException( x.toString()
//
// );
// }
/**
* Create and open a connection input stream.
*
* @param name The URL for the connection.
* @return A DataInputStream.
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the connection cannot
* be found.
* @exception IOException If some other kind of I/O error occurs.
*/
public static DataInputStream openDataInputStream(String name)
throws IOException {
InputConnection con = null;
try {
con = (InputConnection)Connector.open(name, Connector.READ);
} catch (ClassCastException e) {
throw new IOException(
/* #ifdef VERBOSE_EXCEPTIONS */
/// skipped e.toString()
/* #endif */
);
}
try {
return con.openDataInputStream();
} finally {
con.close();
}
}
/**
* Create and open a connection output stream.
*
* @param name The URL for the connection.
* @return A DataOutputStream.
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the connection cannot
* be found.
* @exception IOException If some other kind of I/O error occurs.
*/
public static DataOutputStream openDataOutputStream(String name)
throws IOException {
OutputConnection con = null;
try {
con = (OutputConnection)Connector.open(name, Connector.WRITE);
} catch (ClassCastException e) {
throw new IOException(
/* #ifdef VERBOSE_EXCEPTIONS */
/// skipped e.toString()
/* #endif */
);
}
try {
return con.openDataOutputStream();
} finally {
con.close();
}
}
/**
* Create and open a connection input stream.
*
* @param name The URL for the connection.
* @return An InputStream.
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the connection cannot
* be found.
* @exception IOException If some other kind of I/O error occurs.
*/
public static InputStream openInputStream(String name)
throws IOException {
return openDataInputStream(name);
}
/**
* Create and open a connection output stream.
*
* @param name The URL for the connection.
* @return An OutputStream.
*
* @exception IllegalArgumentException If a parameter is invalid.
* @exception ConnectionNotFoundException If the connection cannot
* be found.
* @exception IOException If some other kind of I/O error occurs.
*/
public static OutputStream openOutputStream(String name)
throws IOException {
return openDataOutputStream(name);
}
}
