访问带有用户名、密码保护的 URL

一、URL，统一资源定位器。指向互联网上的“资源”，可协议名、主机、端口和资源组成

如:  http://username:password@host:8080/directory/file?query#ref:

Component	Example value	Also known as
Protocol	http	scheme
Authority	username:password@host:8080
User Info	username:password
Host	host
Port	8080
File	/directory/file?query
Path	/directory/file
Query	query
Ref	ref	fragment

步骤1：创建 URL

URL url = new URL (urlString);


步骤2：为specificURL 获得用户名称和密码

theUsername、thePassword


步骤3：将它们放入String并用冒号":"分开


String userPassword = theUsername + ":" + thePassword;


步骤4：对字符串进行编码

String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());


步骤5： 通过 URL 创建 URLConnection

URLConnection uc = url.openConnection();


步骤6：为URLConnection 设置“授权”要求属性

uc.setRequestProperty ("Authorization", "Basic " + encoding);

读取数据流。。。。。。