Java 连接到服务器http客户端

我第一次尝试连接到服务器。我从互联网上复制了代码试图执行。但总是在nameValuePairs上显示错误。我不知道这是什么。以及为什么会出现错误。任何人向我解释代码和错误，或解释我通过代码以自己的方式连接到服务器。非常感谢。

您必须制作一份NameValuePair列表。。。像这样

try{
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost("http://nayyar.5gbfree.com/welcome.php");
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                HttpResponse response = httpclient.execute(httppost); 
                HttpEntity entity = response.getEntity();
                is = entity.getContent();

                Log.e("log_tag", "connection success ");
Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
           }

---

您的帖子必须接收哪些数据？例如，如果url需要“id”和“用户”：

HttpClient-HttpClient=newdefaulthttpclient（）；
HttpPost HttpPost=新的HttpPost（“http://nayyar.5gbfree.com/welcome.php");
//添加您的数据
List nameValuePairs=新的ArrayList（2）；
添加（新的BasicNameValuePair（“id”，“12345”）；
添加（新的BasicNameValuePair（“用户”，“Jorgesys！”）；
setEntity（新的UrlEncodedFormEntity（nameValuePairs））；
...
...
...

不，我们不会给您代码。当发布你所写代码的问题时，一定要陈述你的目标。如果有错误，请始终发布堆栈跟踪或编译器错误。或者解释它在您的期望方面的表现。这意味着，您应该声明这些nameValuePairs！错误：无法将nameValuePairs解析为变量您是否尝试查找该错误？你真的没有表现出任何努力。

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://nayyar.5gbfree.com/welcome.php");
List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(
                    postParameters);
httppost.setEntity(formEntity);
HttpResponse response = httpclient.execute(httppost); 

BufferedReader br = new BufferedReader(new InputStreamReader(
                    httppost.getEntity().getContent()));

br.readLine(); // Save it in a String variable or whatever you want 

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://nayyar.5gbfree.com/welcome.php");

            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("id", "12345"));
            nameValuePairs.add(new BasicNameValuePair("user", "Jorgesys!"));

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
    ...
    ...
    ...