代码之家 › 专栏 › 技术社区 › stian

如何在java.net.urlconnection上指定本地地址?

urlconnection ip tomcat java

stian · 技术社区 · 18 年前

我的Tomcat实例正在侦听多个IP地址,但我想控制在打开 URLConnection .

我如何指定?

4 回复 | 直到 18 年前

Javaxpert 18 年前

这应该可以做到:

URL url = new URL(yourUrlHere);
Proxy proxy = new Proxy(Proxy.Type.DIRECT, 
    new InetSocketAddress( 
        InetAddress.getByAddress(
            new byte[]{your, ip, interface, here}), yourTcpPortHere));
URLConnection conn = url.openConnection(proxy);

你就完了。别忘了很好地处理异常,当然也要更改值以适应您的场景。

啊,我省略了进口声明

stian 18 年前

使用ApacheCommons httpclient,我还发现以下功能可以工作(为了清晰起见,删除了try/catch):

HostConfiguration hostConfiguration = new HostConfiguration();
byte b[] = new byte[4];
b[0] = new Integer(192).byteValue();
b[1] = new Integer(168).byteValue();
b[2] = new Integer(1).byteValue();
b[3] = new Integer(11).byteValue();

hostConfiguration.setLocalAddress(InetAddress.getByAddress(b));

HttpClient client = new HttpClient();
client.setHostConfiguration(hostConfiguration);
GetMethod method = new GetMethod("http://remoteserver/");
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
    new DefaultHttpMethodRetryHandler(3, false));
int statusCode = client.executeMethod(method);

if (statusCode != HttpStatus.SC_OK) {
    System.err.println("Method failed: " + method.getStatusLine());
}

byte[] responseBody = method.getResponseBody();
System.out.println(new String(responseBody));");

但是,我仍然想知道如果IP的网关关闭会发生什么(在本例中是192.168.1.11)。下一个网关会被尝试还是会失败?

Tom Hawtin - tackline 18 年前

显而易见的可移植方法是在url.openconnection中设置代理。代理可以在本地主机中,然后可以编写一个非常简单的代理来绑定客户端套接字的本地地址。

如果无法修改URL连接的源,则可以在调用URL构造函数时或通过url.seturlstreamHandlerFactory全局替换urlstreamHandler。然后,UrlstreamHandler可以委托给默认的HTTP/HTTPS处理程序,修改OpenConnection调用。

更极端的方法是完全替换处理程序(可能在JRE中扩展实现)。或者,也可以使用其他(开源)HTTP客户端。

Enzo 13 年前

手动设置插座工作正常…

private HttpsURLConnection openConnection(URL src, URL dest, SSLContext sslContext)
        throws IOException, ProtocolException {
    HttpsURLConnection connection = (HttpsURLConnection) dest.openConnection();
    HttpsHostNameVerifier httpsHostNameVerifier = new HttpsHostNameVerifier();
    connection.setHostnameVerifier(httpsHostNameVerifier);
    connection.setConnectTimeout(CONNECT_TIMEOUT);
    connection.setReadTimeout(READ_TIMEOUT);
    connection.setRequestMethod(POST_METHOD);
    connection.setRequestProperty(CONTENT_TYPE, SoapConstants.CONTENT_TYPE_HEADER);
    connection.setDoOutput(true);
    connection.setDoInput(true);
    connection.setSSLSocketFactory(sslContext.getSocketFactory());
    if ( src!=null ) {
        InetAddress inetAddress = InetAddress.getByName(src.getHost());
        int destPort = dest.getPort();
        if ( destPort <=0 ) 
            destPort=SERVER_HTTPS_PORT;
        int srcPort = src.getPort();
        if ( srcPort <=0 ) 
            srcPort=CLIENT_HTTPS_PORT;
         connectionSocket = connection.getSSLSocketFactory().createSocket(dest.getHost(), destPort, inetAddress, srcPort);
    }
    connection.connect();
    return connection;
}