applet报错解决方案

2012-04-04

applet报错jsp和java代码如下：JAVA:import java.applet.Appletimport java.io.BufferedReaderimport jav

applet报错
jsp和java代码如下：

JAVA:
import java.applet.Applet;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;

public class MACAddressApplet extends Applet
{
private static final long serialVersionUID = 6866002748735327341L;

public static String sep = ":";
public static String format = "%02X";


/**
* getMacAddress - return the first mac address found
* separator - byte seperator default ":"
* format - byte formatter default "%02X"
*
* @param ni - the network interface
* @return String - the mac address as a string
* @throws SocketException - pass it on
*/
public static String macToString( NetworkInterface ni ) throws SocketException
{
return macToString( ni, MACAddressApplet.sep, MACAddressApplet.format );
}

/**
* getMacAddress - return the first mac address found
*
* @param ni - the network interface
* @param separator - byte seperator default ":"
* @param format - byte formatter default "%02X"
* @return String - the mac address as a string
* @throws SocketException - pass it on
*/
public static String macToString( NetworkInterface ni, String separator, String format ) throws SocketException
{
byte mac [] = ni.getHardwareAddress();

if( mac != null ) {
StringBuffer macAddress = new StringBuffer( "" );
String sep = "";
for( byte o : mac ) {
macAddress.append( sep ).append( String.format( format, o ) );
sep = separator;
}
return macAddress.toString();
}

return null;
}

/**
* getMacAddress - return the first mac address found
*
* @return the mac address or undefined
*/
public static String getMacAddress()
{
try {
Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();

// not all interface will have a mace address for instance loopback on windows
while( nis.hasMoreElements() ) {
String mac = macToString( nis.nextElement() );
if( mac != null )
return mac;
}
} catch( SocketException ex ) {
System.err.println( "SocketException:: " + ex.getMessage() );
ex.printStackTrace();
} catch( Exception ex ) {
System.err.println( "Exception:: " + ex.getMessage() );

ex.printStackTrace();
}

return "undefined";
}

/**
* getMacAddressesJSON - return all mac addresses found
*
* @return a JSON array of strings (as a string)
*/
public static String getMacAddressesJSON()
{
try {
String macs [] = getMacAddresses();

String sep = "";
StringBuffer macArray = new StringBuffer( "['" );
for( String mac: macs ) {
macArray.append( sep ).append( mac );
sep = "','";
}
macArray.append( "']" );

return macArray.toString();
} catch( Exception ex ) {
System.err.println( "Exception:: " + ex.getMessage() );
ex.printStackTrace();
}

return "[]";
}

/**
* getMacAddresses - return all mac addresses found
*
* @return array of strings (mac addresses) empty if none found
*/
public static String [] getMacAddresses()
{
try {
Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();

ArrayList<String> macs = new ArrayList<String>();
while( nis.hasMoreElements() ) {
String mac = macToString( nis.nextElement() );
// not all interface will have a mac address for instance loopback on windows
if( mac != null ) {
macs.add( mac );
}
}
return macs.toArray( new String[0] );
} catch( SocketException ex ) {
System.err.println( "SocketException:: " + ex.getMessage() );
ex.printStackTrace();
} catch( Exception ex ) {
System.err.println( "Exception:: " + ex.getMessage() );
ex.printStackTrace();
}

return new String[0];
}

/**
* getMacAddresses - return all mac addresses found
*
* @param sep - use a different separator
*/
public static void setSep( String sep )
{
try {
MACAddressApplet.sep = sep;
} catch( Exception ex ) {
// don't care
}
}

/**
* getMacAddresses - return all mac addresses found
*
* @param format - the output format string for bytes that can be overridden default hex.
*/
public static void setFormat( String format )

{
try {
MACAddressApplet.format = format;
} catch( Exception ex ) {
// don't care
}
}


public static String helloword()
{

return "Hello World!";

}

public static void main( String... args )
{
System.err.println( " MacAddress = " + getMacAddress() );

setSep( "-" );
String macs [] = getMacAddresses();

for( String mac : macs )
System.err.println( " MacAddresses = " + mac );

setSep( ":" );

System.err.println(getMacAddress());

}
}

JSP:
<html>
<head></head>
<body>

<a href="" onclick="getMacAddress();"> Get "first" MAC Address</a>
<br/>
<br/>
<a href="" onclick="getMacAddressesJSON();"> Get all MAC Addresses</a>





<applet
name="MACApplet" codebase= "<%=request.getContextPath()%>/rabbit/jsp/applet"
width="100%" code = "MACAddressApplet.class"
height="20" archive="MACAddressApplet.jar" mayscript="mayscript"></applet>
<script type="text/javascript">
function getMacAddress()
{
//document.applets["MACApplet"].setSep( "-" );
//alert( "Mac Address = " + document.applets["MACApplet"].getMacAddresses() );
document.MACApplet.setSep( ":" );
document.applets["MACApplet"].setFormat( "%02x" );

//alert(document.applets["MACApplet"].helloword());
alert(document.applets["MACApplet"].getMacAddress());

}
function getMacAddressesJSON()
{
document.MACApplet.setSep( ":" );
document.applets["MACApplet"].setFormat( "%02x" );
var macs = eval( String( document.applets["MACApplet"].getMacAddressesJSON() ) );
var mac_string = "";
for( var idx = 0; idx < macs.length; idx ++ )
mac_string += "\t" + macs[ idx ] + "\n ";

alert( "Mac Addresses = \n" + mac_string );
}

</script>

</body>

</html>

[解决办法]
恭喜恭喜！
[解决办法]
恭喜恭喜！ JF,JF

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applet报错解决方案