的HttpClient的Java NoClassDefFoundError的

我想從Java做一個簡單的JSON的客戶端。所以我建立這個代碼：的HttpClient的Java NoClassDefFoundError的

import java.io.BufferedReader; 
import java.io.FileNotFoundException; 
import java.io.FileReader; 
import java.io.IOException; 
import java.io.InputStream; 

import org.apache.http.HttpResponse; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.entity.StringEntity; 
import org.apache.http.impl.client.CloseableHttpClient; 
import org.apache.http.impl.client.HttpClientBuilder; 
import org.json.JSONException; 
import org.json.JSONObject; 

public class JsonSimple { 
    private static final String FILENAME = "C:\\Users\\a41g.txt"; 

    public static void main(String[] args) { 
     JsonSimple s = new JsonSimple(); 
     s.http(); 
    } 

    public HttpResponse http() { 
     BufferedReader br = null; 
     FileReader fr = null; 


     try { 
      fr = new FileReader(FILENAME); 
     } catch (FileNotFoundException e1) { 

     } 

     br = new BufferedReader(fr); 

     String sCurrentLine; 

     try { 
      br = new BufferedReader(new FileReader(FILENAME)); 
     } catch (FileNotFoundException e1) { 

     } 

     try { 
      while ((sCurrentLine = br.readLine()) != null) { 
       System.out.println(sCurrentLine); 
       try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) { //THIS LINE GENERATED EXCEPTION 
        HttpPost request = new HttpPost("http://mylik"); 

        try { 
         JSONObject json = new JSONObject(sCurrentLine); 
         StringEntity se = new StringEntity(json.toString()); 
         request.addHeader("content-type", "application/json"); 
         request.setEntity(se); 
         HttpResponse response = httpClient.execute(request); 
         if (response != null) { 
          InputStream in = response.getEntity().getContent(); //Get the data in the entity 
         } 
        } catch (JSONException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } 
       } catch (IOException ex) { 
        ex.printStackTrace(); 
       } 
      } 
     } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 



     return null; 
    } 
}

，但如果我想開始我的應用我有這樣的錯誤：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/config/Lookup 
    at JsonSimple.http(JsonSimple.java:47) 
    at JsonSimple.main(JsonSimple.java:20) 
Caused by: java.lang.ClassNotFoundException: org.apache.http.config.Lookup 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358) 
    ... 2 more

我插在我的附近產生的行代碼代碼中的註釋例外。