在Java编程中,如何查找系统的代理设置?
以下示例显示如何使用HttpURLConnection
类的systemSetting()
方法和getResponse()
方法的put
方法在系统上查找代理设置并创建代理连接。
package com.yiibai;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Properties;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.URI;
public class FindProxySettings{
public static void main(String s[]) throws Exception {
try {
Properties systemSettings = System.getProperties();
systemSettings.put("proxySet", "true");
systemSettings.put("http.proxyHost", "proxy.yiibai.local");
systemSettings.put("http.proxyPort", "80");
URL u = new URL("http://www.google.com");
HttpURLConnection con = (HttpURLConnection)u.openConnection();
System.out.println(con.getResponseCode() + " : " + con.getResponseMessage());
System.out.println(con.getResponseCode() == HttpURLConnection.HTTP_OK);
} catch (Exception e) {
e.printStackTrace();
System.out.println(false);
}
System.setProperty("java.net.useSystemProxies", "true");
Proxy proxy = (Proxy) ProxySelector.getDefault().select(new URI(
"http://www.baidu.com/")).iterator().
next();;
System.out.println("proxy hostname : " + proxy.type());
InetSocketAddress addr = (InetSocketAddress)proxy.address();
if (addr == null) {
System.out.println("No Proxy");
} else {
System.out.println("proxy hostname : " + addr.getHostName());
System.out.println("proxy port : " + addr.getPort());
}
}
}
Java
上述代码示例将产生以下结果 -
200 : OK
true
proxy hostname : HTTP
proxy hostname : proxy.yiibai.local
proxy port : 80
Shell
示例-2
以下是查找系统的代理设置的另一个示例:
package com.yiibai;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.URI;
import java.util.Iterator;
import java.util.List;
public class FindProxySettings2 {
public static void main(String[] args) {
try {
System.setProperty("java.net.useSystemProxies", "true");
List<Proxy> l = ProxySelector.getDefault().select(new URI("http://www.google.com/"));
for (Iterator<Proxy> iter = l.iterator(); iter.hasNext();) {
Proxy proxy = iter.next();
System.out.println("proxy hostname : " + proxy.type());
InetSocketAddress addr = (InetSocketAddress) proxy.address();
if (addr == null) {
System.out.println("No Proxy");
} else {
System.out.println("proxy hostname : " + addr.getHostName());
System.out.println("proxy port : " + addr.getPort());
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
Java
上述代码示例将产生以下结果 -
proxy hostname : DIRECT
No Proxy
原文地址:https://www.cnblogs.com/borter/p/9617178.html
时间: 2024-10-30 21:40:32