http代理

import java.io.IOException;   
import java.io.InputStream;   
import java.net.InetSocketAddress;   
import java.net.MalformedURLException;   
import java.net.Proxy;   
import java.net.ProxySelector;   
import java.net.SocketAddress;   
import java.net.URI;   
import java.net.URISyntaxException;   
import java.net.URL;   
import java.net.URLConnection;   
import java.util.List;   
import java.util.Properties;   
  
public class NetProxy   
{   
// 测试本地JVM的网络缺省配置   
public void setLocalProxy()   
{   
Properties prop = System.getProperties();   
//设置http访问要使用的代理服务器的地址   
prop.setProperty("http.proxyHost", "10.10.0.96");   
//设置http访问要使用的代理服务器的端口   
prop.setProperty("http.proxyPort", "8080");   
//设置不需要通过代理服务器访问的主机，可以使用*通配符，多个地址用|分隔   
prop.setProperty("http.nonProxyHosts", "localhost|10.10.*");   
  
//设置安全访问使用的代理服务器地址与端口   
//它没有https.nonProxyHosts属性，它按照http.nonProxyHosts 中设置的规则访问   
prop.setProperty("https.proxyHost", "10.10.0.96");   
prop.setProperty("https.proxyPort", "443");   
  
//使用ftp代理服务器的主机、端口以及不需要使用ftp代理服务器的主机   
prop.setProperty("ftp.proxyHost", "10.10.0.96");   
prop.setProperty("ftp.proxyPort", "2121");   
prop.setProperty("ftp.nonProxyHosts", "localhost|10.10.*");   
  
//socks代理服务器的地址与端口   
prop.setProperty("socksProxyHost", "10.10.0.96");   
prop.setProperty("socksProxyPort", "1080");   
}   
  
// 清除proxy设置   
public void removeLocalProxy()   
{   
Properties prop = System.getProperties();   
prop.remove("http.proxyHost");   
prop.remove("http.proxyPort");   
prop.remove("http.nonProxyHosts");   
  
prop.remove("https.proxyHost");   
prop.remove("https.proxyPort");   
  
prop.remove("ftp.proxyHost");   
prop.remove("ftp.proxyPort");   
prop.remove("ftp.nonProxyHosts");   
  
prop.remove("socksProxyHost");   
prop.remove("socksProxyPort");   
}   
  
//   
  
// 测试http   
public void showHttpProxy(Object... proxy)   
{   
URL url = null;   
try   
{   
url = new URL("http://blog.csdn.com/smallnest");   
}   
catch (MalformedURLException e)   
{   
return;   
}   
try   
{   
URLConnection conn = null;   
switch (proxy.length)   
{   
case 0:   
conn = url.openConnection();   
break;   
case 1:   
conn = url.openConnection((Proxy) proxy[0]);   
break;   
default:   
break;   
}   
  
if (conn == null)   
return;   
  
conn.setConnectTimeout(3000); // 设置连接超时时间   
InputStream in = conn.getInputStream();   
byte[] b = new byte[1024];   
try   
{   
while (in.read(b) > 0)   
{   
System.out.println(new String(b));   
}   
}   
catch (IOException e1)   
{   
}   
}   
catch (IOException e1)   
{   
e1.printStackTrace();   
}   
  
}   
  
// 测试ftp   
public void showFtpProxy(Object... proxy)   
{   
URL url = null;   
try   
{   
url = new URL("ftp://ftp.tsinghua.edu.cn");   
}   
catch (MalformedURLException e)   
{   
return;   
}   
try   
{   
URLConnection conn = null;   
switch (proxy.length)   
{   
case 0:   
conn = url.openConnection();   
break;   
case 1:   
conn = url.openConnection((Proxy) proxy[0]);   
break;   
default:   
break;   
}   
  
if (conn == null)   
return;   
  
conn.setConnectTimeout(3000); // 设置连接超时时间   
InputStream in = conn.getInputStream();   
byte[] b = new byte[1024];   
try   
{   
while (in.read(b) > 0)   
{   
System.out.println(new String(b));   
}   
}   
catch (IOException e1)   
{   
}   
}   
catch (IOException e1)   
{   
e1.printStackTrace();   
}   
  
}   
  
// 得到一个proxy   
public Proxy getProxy(Proxy.Type type, String host, int port)   
{   
SocketAddress addr = new InetSocketAddress(host,port);   
Proxy typeProxy = new Proxy(type, addr);   
return typeProxy;   
}   
  
public static void main(String[] args)   
{   
NetProxy proxy = new NetProxy();   
//测试代理服务器   
proxy.setLocalProxy();   
proxy.showHttpProxy();   
  
//下面两行是清除系统属性，而通过Proxy类指定代理服务器   
// proxy.removeLocalProxy   
//proxy.showHttpProxy(proxy.getProxy(Proxy.Type.SOCKS,"10.10.0.96",1080));   
  
  
}   
}