http请求内容gzip压缩

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我是靠谱客的博主超级大山，最近开发中收集的这篇文章主要介绍http请求内容gzip压缩，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

网页内容可以通过tomcat配置进行gzip，通过java代码也可以进行压缩。

http://code.google.com/p/dysys/source/browse/trunk/CommTestMethod/src/com/method/file/web/GzipHtml.java

    /**
    * HTML请求
    * 请求头信息添加支持gzip压缩
    * @param url
    * @return
    * @throws HttpException
    * @throws IOException
    */
    public static String unGzipHtml(String url) throws HttpException, IOException{
        HttpClient http = new HttpClient() ;
        String html = "" ;
        GetMethod get = new GetMethod(url);
        get.addRequestHeader("accept-encoding", "gzip,deflate") ;
        try{
            int er = http.executeMethod(get);
            if(er==200){
                html = getResponseBodyAsString(get) ;
            }
        } finally {
            get.releaseConnection();
        }
        return html ;
    }
    /**
    * 读取请求内容
    * 如果返回内容是压缩内容，解压缩
    * @param get
    * @return
    * @throws IOException
    */
    private static String getResponseBodyAsString(GetMethod get) throws IOException {
        if (get.getResponseBody() != null) {
            if(get.getResponseHeader("Content-Encoding") != null
                    && get.getResponseHeader("Content-Encoding").getValue().toLowerCase().indexOf("gzip") > -1) {
                //For GZip response
                InputStream is = get.getResponseBodyAsStream();
                GZIPInputStream gzin = new GZIPInputStream(is);

                InputStreamReader isr = new InputStreamReader(gzin, get.getResponseCharSet());
                java.io.BufferedReader br = new java.io.BufferedReader(isr);
                StringBuffer sb = new StringBuffer();
                String tempbf;
                while ((tempbf = br.readLine()) != null) {
                    sb.append(tempbf);
                    sb.append("/r/n");
                }
                isr.close();
                gzin.close();
                return sb.toString();
            } else {
                return get.getResponseBodyAsString();
            }
        } else {
            return null;
        }

    }

    /**
    * html输出
    * 如果请求支持gzip
    * 输出内容gzip压缩
    * 输出头信息写入gzip头信息
    * @param response
    * @param request
    * @param content
    * @throws IOException
    */
    public static void gzipHtml(HttpServletResponse response,HttpServletRequest request, String content)
    throws IOException{
        byte[] data = content.getBytes("utf-8") ;

        String encoding = request.getHeader("Accept-Encoding");
        if(encoding !=null && encoding.indexOf("gzip")>-1){
            response.setHeader("Content-Encoding", "gzip") ;
            ByteArrayOutputStream byteOutput = new ByteArrayOutputStream(10240) ;
            GZIPOutputStream output = null ;
            try {
                output = new GZIPOutputStream(byteOutput);
                output.write(data);
            } catch (IOException e) {
                throw new RuntimeException("G-Zip failed.", e);
            } finally {
                if (output != null) {
                    try {
                        output.close();
                    } catch (IOException e) {}
                }
            }
            data = byteOutput.toByteArray();
        }
        response.setContentLength(data.length);
        ServletOutputStream os = response.getOutputStream();
        os.write(data);
        os.close();

    }