HttpClient自动处理Gzip,Deflate压缩

来源：互联网发布：matlab与c语言编辑：程序博客网时间：2024/06/11 13:38

在4.4版本之后通过RequestConfig创建的httpclient能够自动处理压缩数据

如下RequestConfig.class源码

 /**     * Determines whether compressed entities should be decompressed automatically.     * <p>     * Default: {@code true}     * </p>     *     * @since 4.4     */    public boolean isDecompressionEnabled() {        return decompressionEnabled;    }

ResponseContentEncoding （implements HttpResponseInterceptor）类中有处理带压缩header的数据。

 @Override    public void process(            final HttpResponse response,            final HttpContext context) throws HttpException, IOException {        final HttpEntity entity = response.getEntity();        final HttpClientContext clientContext = HttpClientContext.adapt(context);        final RequestConfig requestConfig = clientContext.getRequestConfig();        // entity can be null in case of 304 Not Modified, 204 No Content or similar        // check for zero length entity.        if (requestConfig.isDecompressionEnabled() && entity != null && entity.getContentLength() != 0) {            final Header ceheader = entity.getContentEncoding();            if (ceheader != null) {                final HeaderElement[] codecs = ceheader.getElements();                for (final HeaderElement codec : codecs) {                    final String codecname = codec.getName().toLowerCase(Locale.ROOT);                    final InputStreamFactory decoderFactory = decoderRegistry.lookup(codecname);                    if (decoderFactory != null) {                        response.setEntity(new DecompressingEntity(response.getEntity(), decoderFactory));                        response.removeHeaders("Content-Length");                        response.removeHeaders("Content-Encoding");                        response.removeHeaders("Content-MD5");                    } else {                        if (!"identity".equals(codecname)) {                            throw new HttpException("Unsupported Content-Coding: " + codec.getName());                        }                    }                }            }        }    }

Gzip\Deflate 的解压缩处理类。

/**     * @since 4.4     */    public ResponseContentEncoding(final Lookup<InputStreamFactory> decoderRegistry) {        this.decoderRegistry = decoderRegistry != null ? decoderRegistry :            RegistryBuilder.<InputStreamFactory>create()                    .register("gzip", GZIP)                    .register("x-gzip", GZIP)                    .register("deflate", DEFLATE)                    .build();    }

总结

Httpclient对于原生的HttpConnection做了很多封装处理。方便的同时，当然相比原生的东西，速度上会下降一些，但是带来了很大的便利性。

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