Java 如何让 HttpURLConnection 使用代理？
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How do I make HttpURLConnection use a proxy?
提问by izb
If I do this...
如果我这样做...
conn = new URL(urlString).openConnection();
System.out.println("Proxy? " + conn.usingProxy());
it prints
它打印
Proxy? false
The problem is, I am behind a proxy. Where does the JVM get its proxy information from on Windows? How do I set this up? All my other apps seem perfectly happy with my proxy.
问题是，我支持代理。在 Windows 上，JVM 从哪里获取其代理信息？我该如何设置？我的所有其他应用程序似乎对我的代理非常满意。
采纳答案by NickDK
Since java 1.5 you can also pass a java.net.Proxyinstance to the openConnection(proxy)method:
从 java 1.5 开始，您还可以将java.net.Proxy实例传递给该openConnection(proxy)方法：
//Proxy instance, proxy ip = 10.0.0.1 with port 8080
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.0.0.1", 8080));
conn = new URL(urlString).openConnection(proxy);
If your proxy requires authentication it will give you response 407.
如果您的代理需要身份验证，它将为您提供响应 407。
In this case you'll need the following code:
在这种情况下，您将需要以下代码：
Authenticator authenticator = new Authenticator() {
public PasswordAuthentication getPasswordAuthentication() {
return (new PasswordAuthentication("user",
"password".toCharArray()));
}
};
Authenticator.setDefault(authenticator);
回答by Sean Owen
This is fairly easy to answer from the internet. Set system properties http.proxyHostand http.proxyPort. You can do this with System.setProperty(), or from the command line with the -Dsyntax.
这很容易从互联网上回答。设置系统属性http.proxyHost和http.proxyPort. 您可以使用System.setProperty(), 或使用-D语法从命令行执行此操作。
回答by ZZ Coder
Set following before you openConnection,
在打开连接之前设置以下内容，
System.setProperty("http.proxyHost", "host");
System.setProperty("http.proxyPort", "port_number");
If proxy requires authentication,
如果代理需要身份验证，
System.setProperty("http.proxyUser", "user");
System.setProperty("http.proxyPassword", "password");
回答by Pascal Thivent
Proxies are supported through two system properties: http.proxyHost and http.proxyPort. They must be set to the proxy server and port respectively. The following basic example illustrates it:
通过两个系统属性支持代理：http.proxyHost 和 http.proxyPort。它们必须分别设置为代理服务器和端口。以下基本示例说明了它：
String url = "http://www.google.com/",
proxy = "proxy.mydomain.com",
port = "8080";
URL server = new URL(url);
Properties systemProperties = System.getProperties();
systemProperties.setProperty("http.proxyHost",proxy);
systemProperties.setProperty("http.proxyPort",port);
HttpURLConnection connection = (HttpURLConnection)server.openConnection();
connection.connect();
InputStream in = connection.getInputStream();
readResponse(in);
回答by Daniel Worthington-Bodart
You can also set
你也可以设置
-Djava.net.useSystemProxies=true
On Windows and Linux this will use the system settings so you don't need to repeat yourself (DRY)
在 Windows 和 Linux 上，这将使用系统设置，因此您无需重复（DRY）
http://docs.oracle.com/javase/7/docs/api/java/net/doc-files/net-properties.html#Proxies
http://docs.oracle.com/javase/7/docs/api/java/net/doc-files/net-properties.html#Proxies
回答by Norbert
The approved answer will work ... if you know your proxy host and port =) . But in case you are looking for the proxy host and port the steps below should help
批准的答案将起作用...如果您知道您的代理主机和端口 =) 。但如果您正在寻找代理主机和端口，以下步骤应该会有所帮助
if auto configured proxy is given: then
1> open IE(or any browser)
2> get the url address from your browser through IE->Tools->internet option->connections->LAN Settings-> get address and give in url eg: as http://autocache.abc.com/and enter, a file will be downloaded with .pac format, save to desktop
3> open .pac file in textpad, identify PROXY:
In your editor, it will come something like:
return "PROXY web-proxy.ind.abc.com:8080; PROXY proxy.sgp.abc.com:8080";
如果给出了自动配置的代理：那么
1>打开IE（或任何浏览器）
2> 通过 IE->Tools->internet option->connections->LAN Settings-> 获取地址并输入url 例如：as http://autocache.abc.com/并输入，a文件将以 .pac 格式下载，保存到桌面
3>在textpad中打开.pac文件，识别PROXY：
在你的编辑器中，它会是这样的：
返回 "PROXY web-proxy.ind.abc.com:8080; PROXY proxy.sgp.abc.com:8080";
kudos to bekur from maven in 5 min not working
Once you have the host and port just pop in into this and your good to go
一旦你拥有主机和端口，就可以进入这个，你就可以开始了
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("web-proxy.ind.abc.com", 8080));
URLConnection connection = new URL(url).openConnection(proxy);
回答by Anton
For Java 1.8 and higher you must set -Djdk.http.auth.tunneling.disabledSchemes=to make proxies with Basic Authorization working with https.
对于 Java 1.8 及更高版本，您必须设置-Djdk.http.auth.tunneling.disabledSchemes=为使用 https 使用基本授权的代理。
