Java中设置HTTP代理的方法,更多细节请参考:http://viralpatel.net/blogs/http-proxy-setting-java-setting-proxy-java/
System.getProperties().put("http.proxyHost", "someProxyURL");
System.getProperties().put("http.proxyPort", "someProxyPort");
// http://www.75271.com
System.getProperties().put("http.proxyUser", "someUserName");
System.getProperties().put("http.proxyPassword", "somePassword");
