import java.io.IOException;  import java.util.ArrayList;  import java.util.List;    import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;  import org.apache.commons.httpclient.Header;  import org.apache.commons.httpclient.HttpClient;  import org.apache.commons.httpclient.HttpException;  import org.apache.commons.httpclient.HttpStatus;  import org.apache.commons.httpclient.UsernamePasswordCredentials;  import org.apache.commons.httpclient.auth.AuthScope;  import org.apache.commons.httpclient.methods.GetMethod;  import org.apache.commons.httpclient.params.HttpMethodParams;    public class HttpClientUse {        public static void main(String[] args) throws HttpException, IOException {          HttpClient httpClient = new HttpClient();          //需要验证          UsernamePasswordCredentials creds = new UsernamePasswordCredentials("guest", "guest");          httpClient.getState().setCredentials(AuthScope.ANY, creds);                   //设置http头          List 
     
       headers = new ArrayList 
      
       ();          headers.add(new Header("User-Agent", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)"));          httpClient.getHostConfiguration().getParams().setParameter("http.default-headers", headers);            GetMethod method = new GetMethod("http://localhost:15672/api/exchanges/%2F/amq.direct");        method.setDoAuthentication(true);        method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,                  new DefaultHttpMethodRetryHandler(3, false));          try {              int statusCode = httpClient.executeMethod(method);              if (statusCode != HttpStatus.SC_OK) {                  System.out.println("Method failed code="+statusCode+": " + method.getStatusLine());                } else {                  System.out.println(new String(method.getResponseBody(), "utf-8"));              }          } finally {              method.releaseConnection();          }      }  }
      
     

 注意：

测试使用commons-httpclient-3.0.1.jar