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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript.
It gets rid of almost all the boiler plate code between the web browser and your Java code.
The newest version!
/*
* Copyright 2005 Joe Walker
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.directwebremoting.util;
import java.io.IOException;
import java.io.Writer;
import javax.servlet.ServletOutputStream;
/**
* This is not the evil hack you are looking for.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public final class WriterOutputStream extends ServletOutputStream
{
/**
* ctor using platform default encoding
* @param writer The stream that we proxy to
*/
public WriterOutputStream(Writer writer)
{
this.writer = writer;
}
/**
* ctor that allows us to specify how strings are created
* @param writer The stream that we proxy to
* @param encoding The string encoding of data that we write to the stream
*/
public WriterOutputStream(Writer writer, String encoding)
{
this.writer = writer;
this.encoding = encoding;
}
/* (non-Javadoc)
* @see javax.servlet.ServletOutputStream#print(java.lang.String)
*/
@Override
public void print(String s) throws IOException
{
writer.write(s);
}
/* (non-Javadoc)
* @see java.io.OutputStream#write(byte[])
*/
@Override
public void write(byte[] ba) throws IOException
{
if (encoding == null)
{
writer.write(new String(ba));
}
else
{
writer.write(new String(ba, encoding));
}
}
/* (non-Javadoc)
* @see java.io.OutputStream#write(byte[], int, int)
*/
@Override
public void write(byte[] ba, int off, int len) throws IOException
{
if (encoding == null)
{
writer.write(new String(ba, off, len));
}
else
{
writer.write(new String(ba, off, len, encoding));
}
}
/* (non-Javadoc)
* @see java.io.OutputStream#write(int)
*/
@Override
public synchronized void write(int bite) throws IOException
{
buffer[0] = (byte) bite;
write(buffer);
}
/* (non-Javadoc)
* @see java.io.OutputStream#close()
*/
@Override
public void close() throws IOException
{
if (writer != null)
{
writer.close();
writer = null;
encoding = null;
}
}
/* (non-Javadoc)
* @see java.io.OutputStream#flush()
*/
@Override
public void flush() throws IOException
{
writer.flush();
}
/**
* The destination of all our printing
*/
private Writer writer;
/**
* What string encoding should we use
*/
private String encoding = null;
/**
* Buffer for write(int)
*/
private byte[] buffer = new byte[1];
}
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