DefaultHttpClient 使用GZIPInputStream解压缩 当浏览器访问网站时，有可能浏览器返回的消息头中带有 Content-Encoding:gzip，表明服务器返回的消息经过gzip压缩，这么做是为了节省流量，浏览器拿到gzip压缩后的http包，对其进行解压缩，再渲染出来。在使用apache提供的 DefaultHttpClient操作http请求时，可以使用 GZIPInputStream对gzip压缩过的数据包进行解压缩。android sdk进行网络编程时，也可以使用这种方法。简单代码如下：

DefaultHttpClient httpClient =  new DefaultHttpClient();    //dns探测源ip    String[] dnsIps = {"jsdx", "yndx", "bjdx", "bjlt", "sclt", "shlt", "gg"};    for(String ip : dnsIps)    {        HttpPost post = new HttpPost("http://webscan.360.cn/tools/dnsInfo.php");        post.addHeader("Referer", "http://webscan.360.cn/tools/dnslookup");        post.addHeader("X-Requested-With", "XMLHttpRequest");        post.addHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");        post.addHeader("Accept", "*/*");        post.addHeader("Accept-Encoding", "gzip, deflate");        post.addHeader("Accept-Language", "zh-cn,en-us;q=0.7,en;q=0.3");        post.addHeader("Pragma", "no-cache");        post.addHeader("Cache-Control", "no-cache");        List
    
      params = new ArrayList
     
      ();        params.add(new BasicNameValuePair("dns_ip", ip));        params.add(new BasicNameValuePair("domain_name", domain));        params.add(new BasicNameValuePair("dns_type", "A"));        UrlEncodedFormEntity formEntity = null;        HttpResponse response = null;        String responseHtml = null;        try        {            formEntity = new UrlEncodedFormEntity(params, "utf-8");            post.setEntity(formEntity);            response = httpClient.execute(post);            InputStream is= response.getEntity().getContent();          is= new GZIPInputStream(is);          BufferedReader br = new BufferedReader(new InputStreamReader(is));          String line = null;          StringBuffer sb = new StringBuffer();            while((line = br.readLine())!=null) {             sb.append(line);            }            responseHtml = sb.toString();        } catch (UnsupportedEncodingException e)        {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (ClientProtocolException e)        {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e)        {            // TODO Auto-generated catch block            e.printStackTrace();        }