Java 公共HTTPclient和代理

我正在使用apache的公共httpclient库。是否可以通过代理发出HTTP请求？更具体地说，我需要对多线程POST请求使用代理列表（现在我正在测试单线程GET请求）

我尝试使用：

        httpclient.getHostConfiguration().setProxy("67.177.104.230", 58720);

我发现该代码有错误：

21.03.2012. 20:49:17 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused: connect
21.03.2012. 20:49:17 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
21.03.2012. 20:49:19 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused: connect
21.03.2012. 20:49:19 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
21.03.2012. 20:49:21 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused: connect
21.03.2012. 20:49:21 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
org.apache.commons.httpclient.ProtocolException: The server xxxxx failed to respond with a valid HTTP response
    at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1846)
    at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1590)
    at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:995)
    at org.apache.commons.httpclient.ConnectMethod.execute(ConnectMethod.java:144)
    at org.apache.commons.httpclient.HttpMethodDirector.executeConnect(HttpMethodDirector.java:495)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:390)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
    at test.main(test.java:42)

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当我删除该行时，一切正常。

对于httpclient 4.1.x，您可以这样设置代理（取自）：

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我在

HttpClient

version4中遇到了类似的问题

由于SOCKS代理错误，我无法连接到服务器，我使用以下配置修复了该错误：

client.getParams().setParameter("socksProxyHost",proxyHost);
client.getParams().setParameter("socksProxyPort",proxyPort);

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从Apache HTTPComponents 4.3.x HttpClientBuilder类开始，从系统属性

http.proxyHost

和

http.proxyPort

设置代理默认值，或者您可以使用setProxy方法覆盖它们。

下面是如何使用最新版本的

HTTPClient

（4.3.4）来实现这一点

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虽然这个问题很古老，但我看到仍然没有确切的答案。我将在这里尝试回答这个问题

简而言之，我认为这里的问题是如何为ApacheCommonsHttpClient（org.Apache.commons.HttpClient.HttpClient）设置代理设置

下面的代码段应该可以工作：

HttpClient client = new HttpClient();
HostConfiguration hostConfiguration = client.getHostConfiguration();
hostConfiguration.setProxy("localhost", 8080);
client.setHostConfiguration(hostConfiguration);

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下面是我如何使用Santosh Singh（我给了他+1分）的答案，为旧的（<4.3）HttpClient（我无法升级）解决这个问题的：

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如果您的软件使用

ProxySelector

（例如，使用PAC脚本而不是静态主机/端口），并且您的HTTPComponents版本为4.3或更高版本，则您可以将

ProxySelector

用于

HttpClient

，如下所示：

ProxySelector myProxySelector = ...;
HttpClient myHttpClient = HttpClientBuilder.create().setRoutePlanner(new SystemDefaultRoutePlanner(myProxySelector))).build();

然后像往常一样执行您的请求：

HttpGet myRequest = new HttpGet("/");
myHttpClient.execute(myRequest);

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我不使用新的HTTP组件，我使用的是commons httpclient。也许我应该转学……我参加聚会有点晚了，但这对我的内部发展环境来说很有吸引力。多谢各位，请投赞成票。这确实是可能的。在您的例外情况下，哪个主机是经过编辑的

xxxxx

？你的代理还是目的地？为什么你有这么多的联系被拒绝？您的代理是否正常工作？xxxxx是我发送请求的服务器，而不是代理。代理应该有效。我正在使用socks5类型的代理。您已配置HTTP代理，而不是SOCKS代理。HttpClient 3不支持SOCKS。您可以使用系统属性“socksProxyHost”和“socksProxyPort”。或者HttpComponents HttpClient 4可能支持SOCKS代理。即使我使用http/https代理，我也会遇到很多错误。真的不知道怎么了。我尝试了HttpComponents和Commons HttpClientWhat's new errors？您好，您在哪里设置代理用户/密码的凭据。很抱歉，对此不确定。您可以在此处查看如何使用“CloseableHttpClient httpclient=HttpClients.createDefault（）；”来自tomcat？我有一个servlet，它调用静态函数，该函数假设向另一个服务器发送http请求。经过数小时的搜索，这个答案对我很有帮助。。非常感谢！

HttpClient httpclient = new HttpClient();
if (System.getProperty("http.proxyHost") != null) {
  try {
    HostConfiguration hostConfiguration = httpclient.getHostConfiguration();
    hostConfiguration.setProxy(System.getProperty("http.proxyHost"), Integer.parseInt(System.getProperty("http.proxyPort")));
    httpclient.setHostConfiguration(hostConfiguration);
    this.getLogger().warn("USING PROXY: "+httpclient.getHostConfiguration().getProxyHost());
  } catch (Exception e) {
    throw new ProcessingException("Cannot set proxy!", e);
  }
}

ProxySelector myProxySelector = ...;
HttpClient myHttpClient = HttpClientBuilder.create().setRoutePlanner(new SystemDefaultRoutePlanner(myProxySelector))).build();

HttpGet myRequest = new HttpGet("/");
myHttpClient.execute(myRequest);