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copied!<p>Ok I found a solution and it is easy.</p> <p>What I used it <code>InetAddress.isReachable()</code> method along with some <code>HttpClient</code> by Apache. For proxy checking I used <code>blanksite.com</code> because all I need is check connectability and not speed of proxies.</p> <p>So here is the code(Including input from file, but it is not gui, YET):</p> <pre><code>/* compile with java -cp .;httpclient-4.5.1.jar;httpcore-4.4.3.jar ProxyMat run with java -cp .;httpclient-4.5.1.jar;httpcore-4.4.3.jar;commons-logging-1.2.jar ProxyMat put one proxy to check per line in the proxies.txt file in the form some.host.com:8080 */ import java.io.File; import java.io.FileNotFoundException; import java.io.RandomAccessFile; import java.net.InetAddress; import org.apache.http.params.CoreConnectionPNames; import org.apache.http.HttpEntity; import org.apache.http.HttpHost; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.conn.params.ConnRoutePNames; import org.apache.http.impl.client.DefaultHttpClient; public class ProxyMat{ File file=null; static RandomAccessFile read=null; public ProxyMat(){ file=new File("proxies.txt"); try { read=new RandomAccessFile(file,"rw"); } catch (FileNotFoundException e) { e.printStackTrace(); } } public void checkproxies(){ try{ String line; for(int i=0;i<25;i++){ if((line=read.readLine())!=null){ System.out.println(line); String[] hp=line.split(":"); InetAddress addr=InetAddress.getByName(hp[0]); if(addr.isReachable(5000)){ System.out.println("reached"); ensocketize(hp[0],Integer.parseInt(hp[1])); } } } }catch(Exception ex){ex.printStackTrace();} } public void ensocketize(String host,int port){ try{ File pros=new File("working.txt"); HttpClient client=new DefaultHttpClient(); HttpGet get=new HttpGet("http://blanksite.com/"); HttpHost proxy=new HttpHost(host,port); client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy); client.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 15000); HttpResponse response=client.execute(get); HttpEntity enti=response.getEntity(); if(response!=null){ System.out.println(response.getStatusLine()); System.out.println(response.toString()); System.out.println(host+":"+port+" @@ working"); } }catch(Exception ex){System.out.println("Proxy failed");} } public static void main(String[] args){ ProxyMat mat=new ProxyMat(); mat.checkproxies(); } } </code></pre>

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