pi3jspwriter.java

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\
 *

 Copyright (c) 1997-2003 John Roy, Holger Zimmermann. All rights reserved.

 These sources, libraries and applications are
 FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 as long as the following conditions are adhered to.

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    notice, this list of conditions and the following disclaimer. 

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    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission. 

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 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/Servlet/org/pi3/jsp/core/Pi3JspWriter.java,v $
 * $Date: 2003/05/13 18:42:20 $
 *
 Description:
	Implementation of jsp API JspWriter interface.

\*____________________________________________________________________________*/
 
package org.pi3.jsp.core;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.OutputStream;
import javax.servlet.jsp.JspWriter;
import org.pi3.servlet.util.Pi3BufferedOutputStream;

/**
 * <p>
 * This abstract class emulates some of the functionality found in the
 * java.io.BufferedWriter and java.io.PrintWriter classes,
 * however it differs in that it throws java.io.IOException from the print
 * methods with PrintWriter does not.
 * </p>
 * <p>
 * The "out" implicit variable of a JSP implementation class is of this type.
 * If the page directive selects autoflush="true" then all the I/O operations
 * on this class shall automatically fluch the contents of the buffer if an
 * overflow condition would result if the current operation were performed
 * without a flush. If autoflush="false" then all the I/O operations on this
 * class shall throw an IOException if performing the current opertion would
 * result in a buffer overflow condition.
 * </p>
 *
 * @see java.io.Writer
 * @see java.io.BufferedWriter
 * @see java.io.PrintWriter
 */

public class Pi3JspWriter extends JspWriter {

    private Pi3BufferedOutputStream os = null;
	private PrintWriter pw;

    /** Comment */
    public Pi3JspWriter(OutputStream out, int bufSize,
		boolean autoflush) throws IOException {

		super(bufSize, autoflush);

	    if (bufSize == JspWriter.NO_BUFFER ) {
			pw = new PrintWriter(out);
		} else {
	        os = (bufSize != JspWriter.DEFAULT_BUFFER) ?
				new Pi3BufferedOutputStream(out, bufSize) : new Pi3BufferedOutputStream(out);
			pw = new PrintWriter(os);
		}
	}

    /** Comment */
    private void internalWrite(String s) throws IOException {
		char[] chrs = new char[s.length()];
		s.getChars(0, s.length(), chrs, 0);
		write(chrs, 0, s.length());
	};

    /** Comment */
    private void internalWriteln(String s) throws IOException {
	    StringBuffer sb = new StringBuffer(s);
		sb.append(System.getProperty("line.separator"));
		char[] chrs = new char[sb.length()];
		sb.getChars(0, sb.length(), chrs, 0);
		write(chrs, 0, sb.length());
	};
		

    /** Comment */
    public void write(char[] cbuf, int off, int len) throws IOException {
		if (getRemaining() > len) {
			for (int i = off; i < off + len; pw.print(cbuf[i++]));
		} else {
			if (autoFlush) {
				flush();
				for (int i = off; i < off + len; pw.print(cbuf[i++]));
			} else {
				IOException e = new IOException("Buffer overrun");
				throw e;
			};
	    };
	}


    /**
     * Write a line separator.  The line separator string is defined by the
     * system property <tt>line.separator</tt>, and is not necessarily a single
     * newline ('\n') character.
     *
     * @exception  IOException  If an I/O error occurs
     */

    public void newLine() throws IOException {
		internalWrite(System.getProperty("line.separator"));
	}

    /**
     * Print a boolean value.  The string produced by <code>{@link
     * java.lang.String#valueOf(boolean)}</code> is translated into bytes
     * according to the platform's default character encoding, and these bytes
     * are written in exactly the manner of the <code>{@link
     * #write(int)}</code> method.
     *
     * @param      b   The <code>boolean</code> to be printed
     * @throws	   java.io.IOException
     */

    public void print(boolean b) throws IOException {
		internalWrite(String.valueOf(b));
	}

    /**
     * Print a character.  The character is translated into one or more bytes
     * according to the platform's default character encoding, and these bytes
     * are written in exactly the manner of the <code>{@link
     * #write(int)}</code> method.
     *
     * @param      c   The <code>char</code> to be printed
     * @throws	   java.io.IOException
     */

    public void print(char c) throws IOException {
		internalWrite(String.valueOf(c));
	}

    /**
     * Print an integer.  The string produced by <code>{@link
     * java.lang.String#valueOf(int)}</code> is translated into bytes according
     * to the platform's default character encoding, and these bytes are
     * written in exactly the manner of the <code>{@link #write(int)}</code>
     * method.
     *
     * @param      i   The <code>int</code> to be printed
     * @see        java.lang.Integer#toString(int)
     * @throws	   java.io.IOException
     */

    public void print(int i) throws IOException {
		internalWrite(String.valueOf(i));
	}

    /**
     * Print a long integer.  The string produced by <code>{@link
     * java.lang.String#valueOf(long)}</code> is translated into bytes
     * according to the platform's default character encoding, and these bytes
     * are written in exactly the manner of the <code>{@link #write(int)}</code>
     * method.
     *
     * @param      l   The <code>long</code> to be printed
     * @see        java.lang.Long#toString(long)
     * @throws	   java.io.IOException
     */

    public void print(long l) throws IOException {
		internalWrite(String.valueOf(l));
	}

    /**
     * Print a floating-point number.  The string produced by <code>{@link
     * java.lang.String#valueOf(float)}</code> is translated into bytes
     * according to the platform's default character encoding, and these bytes
     * are written in exactly the manner of the <code>{@link #write(int)}</code>
     * method.
     *
     * @param      f   The <code>float</code> to be printed
     * @see        java.lang.Float#toString(float)
     * @throws	   java.io.IOException
     */

    public void print(float f) throws IOException {
		internalWrite(String.valueOf(f));
	}

    /**
     * Print a double-precision floating-point number.  The string produced by
     * <code>{@link java.lang.String#valueOf(double)}</code> is translated into
     * bytes according to the platform's default character encoding, and these
     * bytes are written in exactly the manner of the <code>{@link
     * #write(int)}</code> method.
     *
     * @param      d   The <code>double</code> to be printed
     * @see        java.lang.Double#toString(double)
     * @throws	   java.io.IOException
     */

    public void print(double d) throws IOException {