详解java中通过post方式访问后台服务器

最近在学习java中通过post方式访问后台服务器，那么今天也算个学习笔记吧！

首先，上代码：

Runnable payRunnable = new Runnable()
      {
        @Override
        public void run()
        {
          try
          {
            HashMap<String, String> payParamMap = new HashMap<String, String>();
            payParamMap.put("canshu" ,"woshicanshu" );
            String payParamStr = XmlUtils.toXml(payParamMap);//转换成xml格式 

            String resultStr = Utils.httpPost(UrlString, payParamStr);//调用访问函数 

            //<span style="font-family: Arial, Helvetica, sans-serif;">resultStr 就是访问所得到的返回值 </span>
          }
          catch(Exception e)
          {
            e.printStackTrace();
          }
        }
      };
      // 必须异步调用
      Thread payThread = new Thread(payRunnable);
      payThread.start(); 

其次，上代码：

public class Utils {
  private static final String TAG = "woshiTag"; 

  public static String httpPost(String url, String entity) {
    if (url == null || url.length() == 0) {
      Log.e(TAG, "httpPost, url is null");
      return null;
    } 

    HttpClient httpClient = getNewHttpClient(); 

    HttpPost httpPost = new HttpPost(url); 

    try {
      httpPost.setEntity(new StringEntity(entity, HTTP.UTF_8));
      httpPost.setHeader("Accept", "application/json");
      httpPost.setHeader("Content-type", "application/json"); 

      HttpResponse resp = httpClient.execute(httpPost);
      if (resp.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
        Log.e(TAG, "httpGet fail, status code = " + resp.getStatusLine().getStatusCode());
        return null;
      } 

      return new String(EntityUtils.toByteArray(resp.getEntity()));
    } catch (Exception e) {
      Log.e(TAG, "httpPost exception, e = " + e.getMessage());
      e.printStackTrace();
      return null;
    }
  }
  private static HttpClient getNewHttpClient() {
      try {
        KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
        trustStore.load(null, null);  

        SSLSocketFactory sf = new SSLSocketFactoryEx(trustStore);
        sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);  

        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, HTTP.UTF_8);  

        SchemeRegistry registry = new SchemeRegistry();
        registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
        registry.register(new Scheme("https", sf, 443));  

        ClientConnectionManager ccm = new ThreadSafeClientConnManager(params, registry);  

        return new DefaultHttpClient(ccm, params);
      } catch (Exception e) {
        return new DefaultHttpClient();
      }
    }
}

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