Utility class to get diagnostic information of the current state of proxy

Following utility class helps you to get the details of current proxy state.

 

ProxyUtil.java

package com.sample.app.net;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.SocketAddress;
import java.net.URI;

public class ProxyUtil {

	private URI uriToConnect;

	public static final String DEFAULT_URI = "https://self-learning-java-tutorial.blogspot.com";

	public ProxyUtil(String uriToConnect) {
		try {
			this.uriToConnect = new URI(uriToConnect);
		} catch (Throwable t) {
			throw new RuntimeException(t);
		}
	}

	public ProxyUtil() {
		this(DEFAULT_URI);
	}

	@Override
	public String toString() {
		ProxySelector proxySelector = ProxySelector.getDefault();

		StringBuilder result = new StringBuilder();
		for (Proxy proxy : proxySelector.select(uriToConnect)) {
			SocketAddress address = proxy.address();

			// address is null for a direct connection.
			if (address == null) {
				result.append("Direct connection\n");
				continue;
			}

			result.append(proxy);

			if (!(address instanceof InetSocketAddress)) {
				result.append("[");
				result.append("Not an instance of InetSocketAddress");
				result.append("]\n");
				continue;
			}

			InetSocketAddress ina = (InetSocketAddress) address;
			result.append(' ');
			result.append(ina.getHostName());
			result.append(':');
			result.append(ina.getPort());
			if (ina.isUnresolved()) {
				result.append(" [unresolved]\n");
				continue;
			}

			InetAddress addr = ina.getAddress();
			result.append(" [");
			result.append(addr.getHostAddress());
			result.append("]\n");
			continue;

		}
		return result.toString();
	}
}

 

ProxyUtilDemo.java

package com.sample.app.net;

public class ProxyUtilDemo {

	public static void main(String[] args) {
		System.out.println(new ProxyUtil());
	}

}

 

 

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