客户端HttpClient4处理ServletGzip后的内容

1、服务器端servlet代码：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setHeader("Cache-Control", "no-cache");
		response.setContentType("text/html;charset=UTF-8");

		String str = "中文测试this is a test!";

		if (isGzipSupport(request)) {// 支持gzip
			response.setHeader("Content-Encoding", "gzip");
			OutputStream os = response.getOutputStream();
			GZIPOutputStream gs = new GZIPOutputStream(os);
			gs.write(str.getBytes("UTF-8"));// 解决中文乱码问题
			gs.finish();
			gs.close();
			os.close();
		} else {
			PrintWriter out = response.getWriter();
			out.write(str);
			out.flush();
			out.close();
		}
	}
	
	/**
     * 判断客户端是否要求进行gzip压缩处理
     * @param request
     * @return
     */
    private boolean isGzipSupport(HttpServletRequest request) {
        String headEncoding = request.getHeader("accept-encoding");
        return (headEncoding != null && (headEncoding.indexOf("gzip") != -1));
    }

部署后，浏览器上访问可以得到如下内容：

中文测试this is a test!

浏览器默认发送的request请求中会携带aeecpt-encoding gzip信息（现代浏览器都支持gzip解压）

2、客户端代码：

package nc.edu.nuc.utils;

import java.io.IOException;
import java.nio.charset.Charset;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.GzipDecompressingEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;


@SuppressWarnings("deprecation")
public class HttpInterceptorUtil {
	private static DefaultHttpClient httpclient = new DefaultHttpClient();  
	
	static {
		httpclient.addRequestInterceptor(new HttpRequestInterceptor() {
			public void process(final HttpRequest request, final HttpContext arg1)
					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  
 
 1）httpClient支持拦截器，我们队client添加了request和response两个拦截器，request拦截器目的是在http header中添加content-encoding gzip信息，方便告诉服务端可以使用gzip压缩，客户端支持解压；response拦截器目的是对gzip数据进行解压。 
 
2）如果把response拦截器注释掉，返回的数据就是乱码：
 
 
 
 
executing request http://localhost:8080/WebTest/SendAndGzipServlet
----------------------------------------
HTTP/1.1 200 OK
Content-Encoding: gzip
Content-Length: 46
----------------------------------------
?