httpclient对gzip响应内容解压

httpclient默认是不会对gzip格式解压的，需要手动处理一下，代码如下：

 DefaultHttpClient httpclient = new DefaultHttpClient();

        httpclient.addRequestInterceptor(new HttpRequestInterceptor() {
           
            public void process(
                    final HttpRequest request, 
                    final HttpContext context) throws HttpException, IOException {
                if (!request.containsHeader("Accept-Encoding")) {
                    request.addHeader("Accept-Encoding", "gzip");
                }
            }

        });
        
        httpclient.addResponseInterceptor(new HttpResponseInterceptor() {
           
            public void process(
                    final HttpResponse response, 
                    final HttpContext context) throws HttpException, IOException {
                HttpEntity entity = response.getEntity();
                Header ceheader = entity.getContentEncoding();
                if (ceheader != null) {
                    HeaderElement[] codecs = ceheader.getElements();
                    for (int i = 0; i < codecs.length; i++) {
                        if (codecs[i].getName().equalsIgnoreCase("gzip")) {
                            response.setEntity(
                                    new GzipDecompressingEntity(response.getEntity())); 
                            return;
                        }
                    }
                }
            }
            
        });
        
        HttpGet httpget = new HttpGet("http://www.apache.org/"); 
        
        // Execute HTTP request
        System.out.println("executing request " + httpget.getURI());
        HttpResponse response = httpclient.execute(httpget);

        System.out.println("----------------------------------------");
        System.out.println(response.getStatusLine());
        System.out.println(response.getLastHeader("Content-Encoding"));
        System.out.println(response.getLastHeader("Content-Length"));
        System.out.println("----------------------------------------");

        HttpEntity entity = response.getEntity();
        
        if (entity != null) {
            String content = EntityUtils.toString(entity);
            System.out.println(content);
            System.out.println("----------------------------------------");
            System.out.println("Uncompressed size: "+content.length());
        }

        // When HttpClient instance is no longer needed, 
        // shut down the connection manager to ensure
        // immediate deallocation of all system resources
        httpclient.getConnectionManager().shutdown();        

 

参考：http://alvinalexander.com/java/jwarehouse/commons-httpclient-4.0.3/httpclient/src/examples/org/apache/http/examples/client/ClientGZipContentCompression.java.shtml

http://hc.apache.org/httpcomponents-client-ga/httpclient/examples/org/apache/http/examples/client/ClientGZipContentCompression.java