Log4Classicning

为了准备LilyBookStore下一步的功能，访问豆瓣的API，今天熟悉了一下JDK和Commons HttpClient中和http相关的接口。Commons中的HttpClient现在已经从Commons中独立出来了，不过新的4.0版还没有stable的release，现在用的3.1还是打着Commons标记的。

JDK实例：

	public void exe(String urlAsString) throws IOException{
		URL url = new URL(urlAsString);
		HttpURLConnection conn = (HttpURLConnection)url.openConnection();
		int size = conn.getHeaderFields().size();
		for(int i=0; i< size; i++){
			System.out.print(conn.getHeaderFieldKey(i)+"\t");
			System.out.println(conn.getHeaderField(i));
		}
		System.out.println("Request Method: "+conn.getRequestMethod());
		System.out.println("Response Code: "+conn.getResponseCode());
		System.out.println("Response Message: " +conn.getResponseMessage());
		System.out.println("Last Modified: " +conn.getLastModified());
		System.out.println("ContentHandler: " +conn.getContent().getClass().getName());
		InputStream in = (InputStream)conn.getContent();
		FileOutputStream out = new FileOutputStream(new File("index.html"));
		copyStream(in, out);
		
	}

public void exe(String urlAsString) throws IOException{<br/> URL url = new URL(urlAsString);<br/> HttpURLConnection conn = (HttpURLConnection)url.openConnection();<br/> int size = conn.getHeaderFields().size();<br/> for(int i=0; i< size; i++){<br/> System.out.print(conn.getHeaderFieldKey(i)+"\t");<br/> System.out.println(conn.getHeaderField(i));<br/> }<br/> System.out.println("Request Method: "+conn.getRequestMethod());<br/> System.out.println("Response Code: "+conn.getResponseCode());<br/> System.out.println("Response Message: " +conn.getResponseMessage());<br/> System.out.println("Last Modified: " +conn.getLastModified());<br/> System.out.println("ContentHandler: " +conn.getContent().getClass().getName());<br/> InputStream in = (InputStream)conn.getContent();<br/> FileOutputStream out = new FileOutputStream(new File("index.html"));<br/> copyStream(in, out);<br/> <br/> }<br/>
java.net.HttpURLConnection里主要注意的就是getContent方法，对于不同的请求返回不同的对象。普通网页返回的是sun.net.www.protocol.http.HttpURLConnection$HttpInputStream，而图片、音频文件返回的则是各自的handler。

Commons的HttpClient实例：

	public void exe(String urlAsString) throws IOException{
		HttpClient client = new HttpClient();
		HttpMethod http = new GetMethod(urlAsString);
		http.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
				new DefaultHttpMethodRetryHandler(1, false));
		client.executeMethod(http);
		System.out.println(http.getStatusCode());
		System.out.println(http.getStatusText());
		InputStream in = http.getResponseBodyAsStream();
		FileOutputStream out = new FileOutputStream(new File("index2.html"));
		copyStream(in, out);
		http.releaseConnection();
	}

public void exe(String urlAsString) throws IOException{<br/> HttpClient client = new HttpClient();<br/> HttpMethod http = new GetMethod(urlAsString);<br/> http.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,<br/> new DefaultHttpMethodRetryHandler(1, false));<br/> client.executeMethod(http);<br/> System.out.println(http.getStatusCode());<br/> System.out.println(http.getStatusText());<br/> InputStream in = http.getResponseBodyAsStream();<br/> FileOutputStream out = new FileOutputStream(new File("index2.html"));<br/> copyStream(in, out);<br/> http.releaseConnection();<br/> }<br/>
Commons中除了getResponseBodyAsStream，还有getResponseBodyAsString，使用起来相对方便一些。

等开学以后到学校复杂的网络环境里试一下，再决定最后选择哪个。