gzipresponsewrapper.java

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/*
 * Copyright 2003 Jayson Falkner ([e-mail])
 * This code is from "Servlets and JavaServer pages; the J2EE Web Tier",
 * http://www.jspbook.com. You may freely use the code both commercially
 * and non-commercially. If you like the code, please pick up a copy of
 * the book and help support the authors, development of more free code,
 * and the JSP/Servlet/J2EE community.
 */
package com.liusoft.dlog4j.servlet;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

/**
 * GZIP的Response封装
 * 
 * @author Winter Lau
 */
public class GZIPResponseWrapper extends HttpServletResponseWrapper {
	protected HttpServletResponse origResponse = null;

	protected ServletOutputStream stream = null;

	protected PrintWriter writer = null;

	public GZIPResponseWrapper(HttpServletResponse response) {
		super(response);
		origResponse = response;
	}

	public ServletOutputStream createOutputStream() throws IOException {
		return (new GZIPResponseStream(origResponse));
	}

	public void finishResponse() {
		try {
			if (writer != null) {
				writer.close();
			} else {
				if (stream != null) {
					stream.close();
				}
			}
		} catch (IOException e) {
		}
	}

	public void flushBuffer() throws IOException {
		stream.flush();
	}

	public ServletOutputStream getOutputStream() throws IOException {
		if (writer != null) {
			throw new IllegalStateException(
					"getWriter() has already been called!");
		}

		if (stream == null)
			stream = createOutputStream();
		return (stream);
	}

	public PrintWriter getWriter() throws IOException {
		if (writer != null) {
			return (writer);
		}

		if (stream != null) {
			throw new IllegalStateException(
					"getOutputStream() has already been called!");
		}

		stream = createOutputStream();
		writer = new PrintWriter(new OutputStreamWriter(stream, "UTF-8"));
		return (writer);
	}

	public void setContentLength(int length) {
	}

}