获取连接超时:连接

Question

当我在url中使用用户名和密码时，我得到了连接超时:连接异常。url为"http://testadmin:testadmin@myhostName/manager/text/list"；

这个url在chrome，firefox web浏览器中工作，但是当我要通过java代码访问这个url时。

下面是我得到的输出和异常：

&&&&&&&&&&&&&&&
*********88
response
java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at sun.net.NetworkClient.doConnect(Unknown Source)
    at sun.net.www.http.HttpClient.openServer(Unknown Source)
    at sun.net.www.http.HttpClient.openServer(Unknown Source)
    at sun.net.www.http.HttpClient.<init>(Unknown Source)
    at sun.net.www.http.HttpClient.New(Unknown Source)
    at sun.net.www.http.HttpClient.New(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at test.TomcatTest.main(TomcatTest.java:23)

我使用了下面的代码。

package test;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class TomcatTest {


    public static void main(String[] args) {
        String listUrl = "http://testadmin:testadmin@myhostName/manager/text/list";
        String serverResponse = "";
        URL url = null;
        try {
            System.out.println("&&&&&&&&&&&&&&&");
            url = new URL(listUrl);
            URLConnection connection = url.openConnection();
            System.out.println("*********88");
            // i also tried without setting readtimeout.
            connection.setReadTimeout(3 * 60 * 1000);// set timeout 3 minutes
            InputStream inputStream = connection.getInputStream();
            System.out.println("^^^^^^^^^^^^^");
            int chr = -1;
            while ((chr = inputStream.read()) != -1) {
                System.out.print((char)chr);
                serverResponse += (char)chr;
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("response " + serverResponse);
    }
}

Answer 1

URL http://<user>:<pass>@url不会以这种方式发送到web服务器。浏览器从url中取出用户名和密码，并创建一个basic authentication头。

Java从字面上将URL发送到服务器。这是一个安全问题，因为URL可能在几个阶段被记录。

此演示代码99%基于带有Java8 Base64适配的answer by Wanderson Santos and joel234：

String _url_string = "http://server/"

url = new URL(_url_string);
URLConnection uc = url.openConnection();
String userpass = _user + ":" + _password;
String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userpass.getBytes()));
uc.setRequestProperty("Authorization", basicAuth);
InputStream in = uc.getInputStream();

Answer 2

现在我有了一个解决方案，我们不能像上面那样在url中使用用户名和密码。

它可以像这样使用：

String listUrl = "http://myHostName/manager/text/list";
//use username and password here
connection.setRequestProperty("Authorization", String.format("Basic %s", new BASE64Encoder().encode("testadmin:testadmin".getBytes("UTF-8"))));