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();  
      }  
    } 
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。