设置代理ip——java

1.   /*JVM设置代理*/
System.getProperties().setProperty("http.proxyHost", ip);  
System.getProperties().setProperty("http.proxyPort", "80");  

 /**
 * 通过代理对象连接
 * @param address
 * @return
 */
SocketAddress addr = new InetSocketAddress(host, Integer.parseInt(port)); 
Proxy proxy = new Proxy(Proxy.Type.HTTP, addr);
try{
    URL url = new URL("http://www.xxx.com");
    URLConnection conn = url.openConnection(proxy);
    conn.setConnectTimeout(5000);
    conn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 7.0; NT 5.1; GTB5; .NET CLR 2.0.50727; CIBA)");
    conn.getContent();
}catch (Exception e) {
    e.printStackTrace();
}