httpclient 代理访问

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httpclient 代理访问15

举个简单例子，想通过httpclient代理访问百度首页。
方法 commonProxy(); 和方法 notProxy()，均可。
但是通过httpclient 代理，就不行了，求指点。

这是错误信息 org.apache.http.conn.HttpHostConnectException: Connection to http://123.163.159.142:6675 refused
为什么使用普通代理就可以访问，而使用httpclient代理，就报错呢？

public static void main(String[] args) throws Exception
	{
		commonProxy();
		System.out.println("--------------------------------------");
		notProxy();
		System.out.println("--------------------------------------");
		useProxy();
	}
	
	/***
	 * 未使用 httpclient 代理
	 * @throws Exception
	 */
	public static void notProxy() throws Exception
	{
		HttpClient client = new DefaultHttpClient();
		HttpGet post = new HttpGet("http://www.baidu.com");
		HttpResponse response = client.execute(post);
		HttpEntity entity = response.getEntity();
		System.out.println("Response content: "
				+ EntityUtils.toString(entity, "UTF-8"));
		client.getConnectionManager().shutdown();
	}
	
	/**
	 * 使用 httpclient 代理
	 * @throws Exception
	 */
	public static void useProxy() throws Exception
	{
		HttpHost proxy = new HttpHost("123.163.159.142", 6675);
		HttpClient client = new DefaultHttpClient();
		client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

		HttpGet post = new HttpGet("http://www.baidu.com");
		HttpResponse response = client.execute(post);
		HttpEntity entity = response.getEntity();
		System.out.println(entity == null);
		client.getConnectionManager().shutdown();
	}
	
	/***
	 * 普通代理
	 * @throws Exception
	 */
	public static void commonProxy() throws Exception
	{
		String strUrl = "http://www.baidu.com"; 
		URL url = new URL(strUrl); 
		URLConnection conn = url.openConnection(); 
		
		Properties systemProperties = System.getProperties(); 
		systemProperties.setProperty("http.proxyHost", "123.163.159.142"); 
		systemProperties.setProperty("http.proxyPort", "6675"); 
		
		String ss = "";

		BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream(), "gb2312")); 

		while ((ss=rd.readLine())!=null) 
		{ 
			System.out.println(ss); 
		} 
		
		rd.close();
	}