获取网页源码,以及内网通过代理访问外网获取

public class WebTools {  
    public static void main(String[] args) {  
        String proxy = "proxy1.bj.petrochina";  
        int port = 8080;  
        String username = "name";  
        String password = "pwd";  
        initProxy(proxy,port,username,password);  
        String url="http://www.google.com";  
        /*System.out.println("content= "+WebTools.getHTML("http://www.baidu.com", "GB2312")); 
        System.out.println("网页源码:"+WebTools.getHTML("http://localhost:9001/rdfcc", "UTF-8"));*/  
        String[] res=WebTools.getSourceCode(url, "UTF-8");  
        if(res[0].equals("0")){  
            System.out.println("Geting Source Code Failed With:"+res[1]);  
        }else{  
            System.out.println("The Source Code Of "+url+" Is :\r\n"+res[1]);  
        }  
    }  
      
    /** 
     * 初始化网络代理,如果内网需要代理才能访问外网的话,那么就需要调用该方法 
     * @param host 代理名称 
     * @param port 端口号 
     * @param username 用户名(如果有的话) 
     * @param password 密码(如果有的话) 
     */  
    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("proxyType", "4");  
        System.setProperty("proxyPort", Integer.toString(port));  
        System.setProperty("proxyHost", host);  
        System.setProperty("proxySet", "true");  
    }  
      
    /** 
     * 获取网页源码 
     * @param pageURL 地址 
     * @param encoding 网页编码 
     * @return 长度为2的字符串数组,第一个元素表示获取是否成功,第二个元素表示成功与否返回的信息 
     */  
    public static String[] getSourceCode(String pageURL, String encoding) {  
        StringBuilder pageHTML = new StringBuilder();  
        try {  
            URL url = new URL(pageURL);  
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();  
            connection.setRequestProperty("User-Agent", "MSIE 7.0");  
            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), encoding));  
            String line = null;   
            while ((line = br.readLine()) != null) {  
                pageHTML.append(line);  
                pageHTML.append("\r\n");  
            }  
            connection.disconnect();  
        } catch (Exception e) {  
            return new String[]{"0",e.getMessage()};  
        }  
        return new String[]{"1",pageHTML.toString()};  
    }  
}