解决 HttpClient 模拟 http 的get 请求后 ，出现 403 错误

 URI uri = builder.build();

            // 创建http GET请求
            HttpGet httpGet = new HttpGet(uri);
            httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36");
            // 执行请求
            response = httpclient.execute(httpGet);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                resultString = EntityUtils.toString(response.getEntity(), Encoding);
            }