Detailed explanation of the code for accessing the backend server through post in java

This article mainly introduces the detailed explanation of accessing the backend server through post method in Java. It has certain reference value. Interested friends can refer to it.

I recently accessed the backend server through post method while learning Java, so today can be considered as a study note!

First, add the code:

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();

Secondly, add the code:

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();  
      }  
    } 
}

The above is the detailed content of Detailed explanation of the code for accessing the backend server through post in java. For more information, please follow other related articles on the PHP Chinese website!