java - Java 中的 UnknownHostException

Question

我正在使用下面的代码连接到一个 url。我在我的办公系统中执行它时收到此错误。但在我的个人笔记本电脑上它正在工作。我认为它必须与代理做一些事情。我有代理详细信息。但是如何在下面的代码中指定它？

java.net.UnknownHostException: www.google.com

import java.util.Properties;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HostConfiguration;
import org.apache.commons.httpclient.methods.GetMethod;

public class test {

public static void main(String args[]) throws Exception {
  HttpClient client = new HttpClient();                   
   GetMethod method = new GetMethod("http://www.google.com");
 try{
      client.executeMethod(method);
  }catch(Exception e) { 
      System.err.println(e); 
  }finally { 
      method.releaseConnection(); 
  }
 }
}

Answer 1

来自 KodeJava

HttpClient client = new HttpClient();
HttpMethod method = new GetMethod("http://www.kodejava.org");
HostConfiguration config = client.getHostConfiguration();

config.setProxy(PROXY_HOST, PROXY_PORT);
String username = "guest"; String password = "s3cr3t";
Credentials credentials = new UsernamePasswordCredentials(username, password);
AuthScope authScope = new AuthScope(PROXY_HOST, PROXY_PORT);
client.getState().setProxyCredentials(authScope, credentials);

然后使用您现有的代码来执行该方法。