java - Android Web 服务连接被拒绝

Question

我知道我的代码是正确的，因为它曾经有效过。我的 PHP 没有问题，因为当它运行时，它返回我想要的内容。这里的问题出在请求上。我正在尝试获取正确的地址，但到目前为止我已经尝试了所有可能的地址但没有成功。我的代码是:

package com.example.testwiththread;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
    JSONParser jsonParser = new JSONParser();
    String pid;
    String name = "";
    String test = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.service_details);
        new Thread(new TestThread()).start();
        Toast.makeText(this, "Hi", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    public void clickSend (View view) {

        EditText txtName = (EditText) findViewById(R.id.txtName);
        EditText txtPrice = (EditText) findViewById(R.id.txtTest);

        // display product data in EditText
        txtName.setText(name);
        txtPrice.setText(test);
        Log.e("Checking", name);
        Log.e("Checking", test);
    }

    public class TestThread extends Thread {
        public void run() {
            int success;
            try {
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("pid", pid));

                // getting product details by making HTTP request
                // Note that product details url will use GET request
                JSONObject json = jsonParser.makeHttpRequest(
                        "http://10.0.2.2:8080/webservice.php", "GET", params);

                // check your log for json response
                Log.d("Single Record Details", json.toString());

                // json success tag
                success = json.getInt("success");
                if (success == 1) {
                    // successfully received product details
                    JSONArray productObj = json.getJSONArray("record"); // JSON Array

                    // get first product object from JSON Array
                    JSONObject product = productObj.getJSONObject(1);

                    name = product.getString("name");
                    test = product.getString("test");
                }
            } catch (JSONException e) {
                Log.e("error", e.toString());
            }
        }
    }
}

我的 JSON 解析器:

package com.example.secondtestsqlserver;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    // function get json from url
    // by making HTTP POST or GET method
    public JSONObject makeHttpRequest(String url, String method,
            List<NameValuePair> params) {

        // Making HTTP request
        try {

            // check for request method
            if(method == "POST"){
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();

            }else if(method == "GET"){
                // request method is GET
                DefaultHttpClient httpClient = new DefaultHttpClient();
                String paramString = URLEncodedUtils.format(params, "utf-8");
                url += "?" + paramString;
                HttpGet httpGet = new HttpGet(url);

                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }           

        } catch (UnsupportedEncodingException e) {
            Log.e("Unsupported Encoding", Log.getStackTraceString(e));
        } catch (ClientProtocolException e) {
            Log.e("Client Protocol", Log.getStackTraceString(e));
        } catch (IOException e) {
            Log.e("IO Exception", Log.getStackTraceString(e));
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
            System.out.println(e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
            Log.e("JSON Parser", json);
        }

        // return JSON String
        return jObj;

    }
}

如您所见，我使用 10.0.2.2:8080 作为本地主机地址。我尝试过 127.0.0.1、localhost 以及 Android 本地主机页面中包含的许多其他选项。大多数都会返回此错误

02-11 15:18:31.329: E/IO Exception(27504): org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.2.2:8080 refused
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
02-11 15:18:31.329: E/IO Exception(27504):  at com.example.testwiththread.JSONParser.makeHttpRequest(JSONParser.java:62)
02-11 15:18:31.329: E/IO Exception(27504):  at com.example.testwiththread.MainActivity$TestThread.run(MainActivity.java:63)
02-11 15:18:31.329: E/IO Exception(27504):  at java.lang.Thread.run(Thread.java:856)
02-11 15:18:31.329: E/IO Exception(27504): Caused by: java.net.ConnectException: failed to connect to /10.0.2.2 (port 8080): connect failed: ETIMEDOUT (Connection timed out)
02-11 15:18:31.329: E/IO Exception(27504):  at libcore.io.IoBridge.connect(IoBridge.java:114)
02-11 15:18:31.329: E/IO Exception(27504):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-11 15:18:31.329: E/IO Exception(27504):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
02-11 15:18:31.329: E/IO Exception(27504):  at java.net.Socket.connect(Socket.java:842)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
02-11 15:18:31.329: E/IO Exception(27504):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
02-11 15:18:31.329: E/IO Exception(27504):  ... 9 more
02-11 15:18:31.329: E/IO Exception(27504): Caused by: libcore.io.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
02-11 15:18:31.329: E/IO Exception(27504):  at libcore.io.Posix.connect(Native Method)
02-11 15:18:31.329: E/IO Exception(27504):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
02-11 15:18:31.329: E/IO Exception(27504):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
02-11 15:18:31.329: E/IO Exception(27504):  at libcore.io.IoBridge.connect(IoBridge.java:112)
02-11 15:18:31.329: E/IO Exception(27504):  ... 14 more
02-11 15:18:31.329: E/Buffer Error(27504): Error converting result java.lang.NullPointerException: lock == null
02-11 15:18:31.329: E/JSON Parser(27504): Error parsing data org.json.JSONException: End of input at character 0 of 
02-11 15:18:31.329: W/dalvikvm(27504): threadid=11: thread exiting with uncaught exception (group=0x40e46930)
02-11 15:18:31.329: E/AndroidRuntime(27504): FATAL EXCEPTION: Thread-9043
02-11 15:18:31.329: E/AndroidRuntime(27504): java.lang.NullPointerException
02-11 15:18:31.329: E/AndroidRuntime(27504):    at com.example.testwiththread.MainActivity$TestThread.run(MainActivity.java:67)
02-11 15:18:31.329: E/AndroidRuntime(27504):    at java.lang.Thread.run(Thread.java:856)

但是，唯一不返回此错误的是当我使用路由器的 IP 地址时。问题是，即使连接没有被拒绝，但它说访问被禁止。任何帮助将不胜感激。

编辑:以防万一，我在 list 中提供了互联网访问权限。

Answer 1

如果您的 WAMP 服务器未位于 10.0.2.2，则无法使用 http://10.0.2.2:8080/webservice.php。此地址在与您的网络服务器运行在同一主机上的模拟器中使用，这意味着如果您在平板电脑上而不是 Android 模拟器程序上进行测试，它将无法为您工作。要解决此问题，请将您的地址更新为:

(A) 路由器的公共(public) IP，并进行适当的端口转发，将端口 8080 路由到 WAMP 主机。
(B) 您的 WiFi 网络的本地 IP 地址。在典型设置下，这是 192.168.1.x，但我们不能保证这一点。请注意，这将允许您的连接仅在您使用家庭 WiFi 时工作。

您可以通过谷歌搜索“我的 IP 是什么”来找到您的公共(public) IP。您可以通过打开开始->运行->cmd并输入ipconfig来找到您的本地IP。 “IPv4 地址”旁边列出的地址应为您提供详细信息。