Java通过url获取数据, 设置代理

public static byte[] GetHttpResponse(String url, String params, boolean isPost) {
        DefaultHttpClient hClient = new DefaultHttpClient();
        try {
            String uri = url + "?" + params;
            logger.info("request to :" + uri);
            HttpParams p = hClient.getParams();
            p.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 3000);
            p.setBooleanParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, false);
            p.setParameter(CoreProtocolPNames.USER_AGENT, "Android App");
            //代理设置
            HttpHost proxy = new HttpHost("proxy.aus.hp.com", 8080);
            p.setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
            //....
            HttpResponse response = null;
            if (isPost) {
                HttpPost post = new HttpPost(url);
                StringEntity se = new StringEntity(params, "utf-8");
                se.setContentType("application/x-www-form-urlencoded");
                post.setEntity(se);
                response = hClient.execute(post);
            } else {
                HttpGet get = new HttpGet(uri);                
                response = hClient.execute(get);
            }

            int returnCode = response.getStatusLine().getStatusCode();
            if (returnCode != 200) {
                throw new Exception("访问失败 httpcode:" + returnCode);
            }
            return EntityUtils.toByteArray(response.getEntity());
        } catch (Exception ex) {
            logger.error(ex, "访问失败");
            throw new Exception("访问失败");
        } finally {
            hClient.getConnectionManager().shutdown();
        }
    }