HttpCLient实现对被GZip压缩过的Response进行解压

发送请求(要求服务端对response进行GZip压缩)：

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;

public class TestGzip {

    private final static String url = "http://localhost:8888/ltest.jsp";

    public static void main(String[] args) throws Exception{
        HttpClient http = new HttpClient();
        CustomGetMethod get = new CustomGetMethod(url);

       //添加头信息告诉服务端可以对Response进行GZip压缩
        get.setRequestHeader("Accept-Encoding", "gzip, deflate");
        try {
            int statusCode = http.executeMethod(get);
            if (statusCode != HttpStatus.SC_OK) {
                System.err.println("Method failed: "
                        + get.getStatusLine());
            }

            //打印解压后的返回信息
            System.out.println(get.getResponseBodyAsString());
        } catch (Exception e) {
            System.err.println("页面无法访问");
            e.printStackTrace();
        } finally {
        get.releaseConnection();
        }
    }
}

 

下面是CustomGetMethod.java的内容，getResponseBodyAsString()方法被重写，加入了解压功能

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;



public class CustomGetMethod extends org.apache.commons.httpclient.methods.GetMethod{

    public CustomGetMethod(String uri) {
        super(uri);
    }


    /**
     * Get response as string whether response is GZipped or not
     *
     * @return
     * @throws IOException
     */
    @Override
    public String getResponseBodyAsString() throws IOException {
        GZIPInputStream gzin;
        if (getResponseBody() != null || getResponseStream() != null) {

            if(getResponseHeader("Content-Encoding") != null
                     && getResponseHeader("Content-Encoding").getValue().toLowerCase().indexOf("gzip") > -1) {
                    //For GZip response
                    InputStream is = getResponseBodyAsStream();
                    gzin = new GZIPInputStream(is);

                    InputStreamReader isr = new InputStreamReader(gzin, 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 {
                //For deflate response
                return super.getResponseBodyAsString();
            }
        } else {
            return null;
        }
    }

}