HttpClient的不工作

Question

由於HttpClient的是棄用API級別22和API等級23去掉，我根據這個鏈接中使用

android { 
    useLibrary 'org.apache.http.legacy' 
} 

和

compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'` 

：Lik1和Link 2 。我用下面的類連接，並從服務器讀取信息：

public class Webservice { 

public static String readurl(String url, ArrayList<NameValuePair> params) { 

    try { 
     HttpClient client = new DefaultHttpClient(); 
     HttpPost method = new HttpPost(url); 
     if (params != null) { 
      method.setEntity(new UrlEncodedFormEntity(params)); 

     } 
     HttpResponse response = client.execute(method); 
     InputStream stream = response.getEntity().getContent(); 
     String result = inputstreamTOString(stream); 
     return result; 
    } 
    catch (ClientProtocolException e) { 

     e.printStackTrace(); 
    } 
    catch (IOException e) { 

     e.printStackTrace(); 
    } 

    return null; 
} 
} 

但是當我跑我的應用程序，它已墜毀在String result = Webservice.readurl(url, params); 下面鱈魚：

public void populateFromServer() { 

    String url = G.server_service; 
    ArrayList<NameValuePair> params = new ArrayList<NameValuePair>(); 
    params.add(new BasicNameValuePair("action", "read")); 
    String result = Webservice.readurl(url, params); 

. 
. 
. 
} 

Answer 1

既然你沒有指定什麼確切的是錯誤。我會給你一個漂亮的HttpTask代碼，和JSONParser一起使用。

如果您的中間件使用JSON響應，此代碼將可用。

要調用HTTPTask

Boolean Some_variable = new HttpTask(getBaseContext()).doInBackground("test"); 

HttpTask

package com.example.summer.toothbrush; 

import android.content.Context; 
import android.os.AsyncTask; 
import android.util.Log; 

import org.json.JSONException; 
import org.json.JSONObject; 

public class HttpTask extends AsyncTask<String,Void,Boolean> { 

    Context mainContext; 
    JSONObject jsonObject; 

    public HttpTask(Context context){ mainContext = context; } 

    @Override 
    protected Boolean doInBackground(String... params){ 
    jsonObject = new JSONObject(); 
    JSONObject responseJsonObject = new JSONObject(); 
    StringBuilder result = new StringBuilder(""); 
    JSONParser jsonParser = new JSONParser(mainContext); 
    if(params[0] == "test") 
     jsonObject.put("test", "test"); 

    try{ 
     responseJsonObject = jsonParser.passJSONinURL(jsonObject,params[0]); 
     result.append(responseJsonObject.get("status").toString()); 
     Log.d("Result", result.toString()); 
    } 
    catch(JSONException e){ 
     e.printStackTrace(); 
    } 
    if(result.toString().equals("true")) 
     return true; 
    else 
     return false; 
    } 
} 

JSONParser

package com.example.summer.toothbrush; 

import android.content.Context; 
import android.os.StrictMode; 
import android.util.Log; 
import android.widget.Toast; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.StatusLine; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.URLEncoder; 

public class JSONParser { 

Context mainContext; 
HttpResponse response; 
StringBuilder result = new StringBuilder(""); 

public JSONParser(Context context){ 
    mainContext = context; 
} 

public JSONObject passJSONinURL(JSONObject obj,String mode){ 
    StringBuilder builder = new StringBuilder(""); 
    JSONObject jsonObject = new JSONObject(); 

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
    StrictMode.setThreadPolicy(policy); 

    try{ 
     response = null; 
     HttpClient httpClient = new DefaultHttpClient(); 
     StringBuilder stringURL = new StringBuilder(""); 
     stringURL.append("http://100.100.10.10:8000/"); 
     if(mode.equals("test")) 
      stringURL.append("test"); 

     //URLEncoder.encode() is used to encode the parameters in a request. 
     stringURL.append(URLEncoder.encode(obj.toString(),"UTF-8")); 
     //Toast.makeText(mainContext, stringURL.toString(),Toast.LENGTH_LONG).show(); 
     Log.d("JSON to be sent",stringURL.toString()); 
     HttpGet get = new HttpGet(stringURL.toString()); 
     response = httpClient.execute(get); 
     StatusLine statusLine = response.getStatusLine(); 
     int statusCode = statusLine.getStatusCode(); 
     if(statusCode == 200) { 
      HttpEntity entity = response.getEntity(); 
      InputStream content = entity.getContent(); 

      BufferedReader reader = new BufferedReader(new InputStreamReader(content)); 
      String line; 
      while ((line = reader.readLine()) != null) { 
       builder.append(line); 
      } 
      reader.close(); 
     } 
     else{ 
      Toast.makeText(mainContext,"Status Code Error!!!",Toast.LENGTH_LONG).show(); 
     } 

    } 
    catch(ClientProtocolException e){ 
     e.printStackTrace(); 
    } 
    catch(IOException e){ 
     e.printStackTrace(); 
    } 

    try{ 
     jsonObject = new JSONObject(builder.toString()); 

    }catch(JSONException e){ 
     Toast.makeText(mainContext,"JSON Parsing ERROR!!!!",Toast.LENGTH_LONG).show(); 
    } 
    Log.d("JSONOBJECT : ",jsonObject.toString()); 
    return jsonObject; 
} 
}