HttpClient 解决中文乱码

public static String httpGet(String url) {
        try {
            HttpGet httpGet = new HttpGet(url);
            HttpClient client = new DefaultHttpClient();
            HttpResponse resp = client.execute(httpGet);

            HttpEntity entity = resp.getEntity();
            String respContent = EntityUtils.toString(entity , "GBK").trim();
            httpGet.abort();
            client.getConnectionManager().shutdown();

            return respContent;

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

public static String httpPost(String url, Map<String, String> params){
　　try {
　　　　　　　HttpPost httpPost = new HttpPost(url);
            HttpClient client = new DefaultHttpClient();
            List<NameValuePair> valuePairs = new ArrayList<NameValuePair>(params.size());
            for(Map.Entry<String, String> entry : params.entrySet()){
                NameValuePair nameValuePair = new BasicNameValuePair(entry.getKey(), String.valueOf(entry.getValue()));
                valuePairs.add(nameValuePair);
            }
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(valuePairs, "GBK");
            httpPost.setEntity(formEntity);
            HttpResponse resp = client.execute(httpPost);

            HttpEntity entity = resp.getEntity();
            String respContent = EntityUtils.toString(entity , "GBK").trim();
            httpPost.abort();
            client.getConnectionManager().shutdown();

            return respContent;

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }