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由于微信API接口建议使用Https请求方式 而且过不久就废弃http请求方式了 所以提供以下Https工具类

public class SSLClient extends DefaultHttpClient{
    public SSLClient() throws Exception{
        super();
        SSLContext ctx = SSLContext.getInstance("TLS");
        X509TrustManager tm = new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }
            @Override
            public void checkServerTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        };
        ctx.init(null, new TrustManager[]{tm}, null);
        SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
        ClientConnectionManager ccm = this.getConnectionManager();
        SchemeRegistry sr = ccm.getSchemeRegistry();
        sr.register(new Scheme("https", 443, ssf));
    }
}

https请求工具类

public class HttpClientUtil {

    /**
     * 发送post请求
     * @param url
     * @param map
     * @param charset
     * @return
     */
    public static String doPost(String url,Map<String,String> map,String charset){
        HttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        try{
            httpClient = new SSLClient();
            httpPost = new HttpPost(url);
            //设置参数
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator iterator = map.entrySet().iterator();
            while(iterator.hasNext()){
                Entry<String,String> elem = (Entry<String, String>) iterator.next();
                list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));
            }
            if(list.size() > 0){
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
                httpPost.setEntity(entity);
            }
            HttpResponse response = httpClient.execute(httpPost);
            if(response != null){
                HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity,charset);
                }
            }
        }catch(Exception ex){
            ex.printStackTrace();
        }
        return result;
    }

    /**
     * 发送get请求
     * @param url       链接地址
     * @param charset   字符编码，若为null则默认utf-8
     * @return
     */
    public static String doGet(String url,String charset){
        if(null == charset){
            charset = "utf-8";
        }
        HttpClient httpClient = null;
        HttpGet httpGet= null;
        String result = null;

        try {
            httpClient = new SSLClient();
            httpGet = new HttpGet(url);

            HttpResponse response = httpClient.execute(httpGet);
            if(response != null){
                HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity,charset);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }

}

本工具类根据http://blog.csdn.net/rongyongfeikai2/article/details/41659353/进行了小改