网上也有一些文章但是大多数涉及带有授权验证的proxy都有问题，主要问题就是出在对authenticator.setdefault的使用，以及base64编码的问题上代码是最没有二义性的文档，实现原理不再解释，请看代码去体会。如果转载请注明代码出处。
package org.chimae.net;
import java.io.bufferedreader;
import java.io.ioexception;
import java.io.inputstream;
import java.io.inputstreamreader;
import java.net.authenticator;
import java.net.httpurlconnection;
import java.net.passwordauthentication;
import java.net.url;
/**
* @author chimae@cnjsp.org
*/
public class proxyconntest {
public static void initproxy(string host, int port, final string username,
final string password) {
authenticator.setdefault(new authenticator() {
protected passwordauthentication getpasswordauthentication() {
return new passwordauthentication(username,
new string(password).tochararray());
}
});
system.setproperty(\"http.proxytype\", \"4\");
system.setproperty(\"http.proxyport\", integer.tostring(port));
system.setproperty(\"http.proxyhost\", host);
system.setproperty(\"http.proxyset\", \"true\");
}
public static void main(string[] args) throws ioexception {
string url = \"http://java.sun.com/\";
string proxy = \"yourproxy\";
int port =8080;
string username =\"username\";
string password =\"password\";
string curline = \"\";
string content = \"\";
url server = new url(url);
initproxy(proxy,port,username,password);
httpurlconnection connection = (httpurlconnection)server.openconnection();
connection.connect();
inputstream is = connection.getinputstream();
bufferedreader reader = new bufferedreader(new inputstreamreader(is));
while ((curline = reader.readline()) != null) {
content += curline;
}
system.out.println(\"content= \" + content);
is.close();
}
}
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