JAVA怎样调用https类型的webservice

/**
* 发送HTTPS_POST请求
* @see 该方法会自动关闭连接,释放资源
* @see 该方法会自动对params中的[中文][|][ ]等特殊字符进行URLEncoder.encode(string,encodeCharset)
* @param reqURL 请求地址
* @param params 请求参数
* @param encodeCharset 编码字符集,编码请求数据时用之,其为null时默认采用UTF-8解码
* @param decodeCharset 解码字符集,解析响应数据时用之,其为null时默认采用UTF-8解码
* @return 远程主机响应正文
*/
public static String sendPostSSLRequest(String reqURL, Map params, String encodeCharset, String decodeCharset){
String responseContent = "";
HttpClient httpClient = new DefaultHttpClient();
X509TrustManager xtm = new X509TrustManager(){
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {}
public X509Certificate[] getAcceptedIssuers() {return null;}
};
try {
SSLContext ctx = SSLContext.getInstance("TLS");
ctx.init(null, new TrustManager[]{xtm}, null);
SSLSocketFactory socketFactory = new SSLSocketFactory(ctx);
httpClient.getConnectionManager().getSchemeRegistry().register(new Scheme("https", socketFactory, 443));

HttpPost httpPost = new HttpPost(reqURL);
List formParams = new ArrayList();
for(Map.Entry entry : params.entrySet()){
formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
httpPost.setEntity(new UrlEncodedFormEntity(formParams, encodeCharset==null ? "UTF-8" : encodeCharset));

HttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
if (null != entity) {
responseContent = EntityUtils.toString(entity, decodeCharset==null ? "UTF-8" : decodeCharset);
EntityUtils.consume(entity);
}
} catch (Exception e) {
System.out.println("与[" + reqURL + "]通信过程中发生异常,堆栈信息为");
} finally {
httpClient.getConnectionManager().shutdown();
}
return responseContent;
}