Web service 基本认证相关源码

转自：http://www.rgagnon.com/javadetails/java-0085.html。

Proxy and Username/Password

You might need to identify yourself to the proxy server.

One way is to use the HTTP property "Proxy-Authorization" with a username:password base64 encoded.

System.setProperty("http.proxyHost", "myProxyServer.com");
System.setProperty("http.proxyPort", "80");
URL url=new URL("http://someserver/somepage");
URLConnection uc = url.openConnection ();
String encoded = new String
(Base64.base64Encode(new String("username:password").getBytes()));
uc.setRequestProperty("Proxy-Authorization", "Basic " + encoded);
uc.connect();

NOTE: For a base64 function, see this
How-to.

The following example dumps the content of a URL but before we identify ourself to the proxy.

import java.net.*;
import java.io.*;

public class URLUtils {
public static void main(String s[]) {
URLUtils.dump("http://www.yahoo.com");
System.out.println("**************");
URLUtils.dump("https://www.paypal.com");
System.out.println("**************");
}

public static void dump(String URLName){
try {
DataInputStream di = null;
FileOutputStream fo = null;
byte [] b = new byte[1];

// PROXY
System.setProperty("http.proxyHost","proxy.mydomain.local") ;
System.setProperty("http.proxyPort", "80") ;

URL u = new URL(URLName);
HttpURLConnection con = (HttpURLConnection) u.openConnection();
//
// it's not the greatest idea to use a sun.misc.* class
// Sun strongly advises not to use them since they can
// change or go away in a future release so beware.
//
sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
String encodedUserPwd =
encoder.encode("mydomain\\MYUSER:MYPASSWORD".getBytes());
con.setRequestProperty
("Proxy-Authorization", "Basic " + encodedUserPwd);
// PROXY ----------

di = new DataInputStream(con.getInputStream());
while(-1 != di.read(b,0,1)) {
System.out.print(new String(b));
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}

With JDK1.2, the
java.net.Authenticator can be used to send the credentials when needed.

public static void dump(String URLName){
try {
DataInputStream di = null;
FileOutputStream fo = null;
byte [] b = new byte[1];

// PROXY
System.setProperty("http.proxyHost","proxy.mydomain.local") ;
System.setProperty("http.proxyPort", "80") ;

Authenticator.setDefault(new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new
PasswordAuthentication("mydomain\\username","password".toCharArray());
}});

URL u = new URL(URLName);
HttpURLConnection con = (HttpURLConnection) u.openConnection();
di = new DataInputStream(con.getInputStream());
while(-1 != di.read(b,0,1)) {
System.out.print(new String(b));
}
}
catch (Exception e) {
e.printStackTrace();
}
}

Bypass a Proxy

In intranet environment, you may need to bypass the proxy server and go directly to the http server.

The http.nonProxyHosts property indicates the hosts which should be connected too directly and not through the proxy server. The value can be a list of hosts, each seperated by a |, and in addition a wildcard character (*) can be used for matching.

java.exe