问题描述

Android关于HttpPost无法发送的问题

Manifest里添加了Internet权限

Activity类

 import com.google.gson.Gson;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity {    Button sendButton;    EditText userEditText pwdEditText;    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        sendButton = (Button) findViewById(R.id.button1);        userEditText = (EditText)findViewById(R.id.editText1);        pwdEditText = (EditText)findViewById(R.id.editText2);        //利用Handler更新UI        final Handler h = new Handler(){            @Override            public void handleMessage(Message msg) {                Toast.makeText(MainActivity.this msg.toString() Toast.LENGTH_LONG).show();            }        };        sendButton.setOnClickListener(new OnClickListener()        {            @Override            public void onClick(View v)            {                User user = new User();                user.setName(userEditText.getText().toString().trim());                user.setPwd(pwdEditText.getText().toString().trim());                Gson gson = new Gson();                String userJasonString = gson.toJson(user);                new Thread(new AccessNetwork(""192.168.199.1:8888/gcgl/user.do?method=login""userJasonString h)).start();            }                   });    }}

创建的线程AccessNetwork

 import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.params.CoreConnectionPNames;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;import android.os.Handler;import android.os.Message;import android.util.Log;import android.widget.Toast;public class AccessNetwork implements Runnable{    private String url;    private String params;    private Handler h;    public AccessNetwork(String url String paramsHandler h) {        super();        this.url = url;        this.params = params;        this.h = h;    }    @Override    public void run() {        Message m = new Message();        m.obj = sendPost(url params);        h.sendMessage(m);    }    public static String sendPost(String url String params)    {        List<NameValuePair> nameValuePairs;        String displayString=""1"";        try        {            HttpClient httpClient = new DefaultHttpClient();            HttpPost post = new HttpPost(url);//              httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT 15000); //              httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT 15000);//              nameValuePairs= new ArrayList<NameValuePair>();//              nameValuePairs.add(new BasicNameValuePair(""params"" params));//              post.setEntity(new UrlEncodedFormEntity(nameValuePairsHTTP.UTF_8));            HttpResponse rsp = httpClient.execute(post);            HttpEntity httpEntity = rsp.getEntity();            displayString += EntityUtils.toString(httpEntity);        }        catch (Exception e)        {            //Toast.makeText(nulle.toString() Toast.LENGTH_LONG).show();            e.printStackTrace();        }        return displayString;    }}

发送带不带参数的Post请求服务器端都无法得到。

解决方案

如果发送错误，你应该能看到错误日志的，然后核查url是否正常，端口是否打开等网络问题

解决方案二：
典型问题，没开子线程，网络操作要在工作线程执行

解决方案三：

 new Thread(                public void run(){}).start();

解决方案四：
初学者不要弄清楚原理，用OKHttp或者Volley就能解决问题

解决方案五：
Android的4.0版本后，网络请求操作要在子线程里面运行。不能在主线程里面。

解决方案六：
看url像内部地址，是否已经连上内网进行请求？

解决方案七：
Android4.0的都要放在线程里，一般都是通过异步任务获取Handler机制的
你可以参考我的博客哦！http://blog.csdn.net/u014427391/article/details/50255285
希望可以帮助您！