URL學習筆記_ZenDei技術網路在線

不多說，先上代碼，代碼的註釋寫的已經挺詳細的了首先先瞭解了URL的一些常用的方法，現在我嘗試利用網址讀入內容到控制台列印輸出很好奇會列印出什麼東西呢下麵就是列印出來的東西並不是想象中的會將我寫的博客列印出來，而是列印出了頁面的HTML佈局代碼而教程中，使用Tomcat伺服器，URL地址指定 ...

不多說，先上代碼，代碼的註釋寫的已經挺詳細的了

 1 //URL:統一資源定位符，一個URL的對象，對應著互聯網上的一個資源。
 2 //我們可以通過URL的對象調用其相應的方法，將此資源讀取（即所謂的“下載”）
 3 public class TestURL {
 4     //看URL下有哪些常用的方法
 5     @Test
 6     public void Testurl() throws MalformedURLException{
 7         //1.創建一個URL的對象
 8         //參數部分可以傳入一個網址的絕對路徑，這裡我傳人的是我寫的一篇博客的地址
 9         URL url = new URL("http://www.cnblogs.com/gode/p/5812013.html");
10         
11         //獲取該URL的協議名
12         System.out.println(url.getProtocol());//http
13         //獲取該URL的主機名
14         System.out.println(url.getHost());//www.cnblogs.com
15         //獲取該URL的埠號
16         System.out.println(url.getPort());//-1
17         //獲取該URL的文件路徑
18         System.out.println(url.getPath());//  /gode/p/5812013.html
19         //獲取該URL的文件名
20         System.out.println(url.getFile());//  /gode/p/5812013.html
21         //獲取該URL在文件中的相對位置
22         System.out.println(url.getRef());//null
23         //獲取該URL的查詢名
24         System.out.println(url.getQuery());//null
25     }

首先先瞭解了URL的一些常用的方法，現在我嘗試利用網址讀入內容到控制台列印輸出

很好奇會列印出什麼東西呢

 1     //如何將服務端的資源讀取進來
 2     @Test
 3     public void Testurl1() throws Exception{
 4         //1.創建一個URL的對象
 5         //參數部分可以傳入一個網址的絕對路徑，這裡我傳人的是我寫的一篇博客的地址
 6         URL url = new URL("http://www.cnblogs.com/gode/p/5812013.html");
 7         
 8         //2.URL讀入的方法是openStream
 9         InputStream is = url.openStream();
10         
11         //3.列印到控制臺上試試
12         byte[] b = new byte[1024];
13         int length;
14         while((length = is.read(b)) != -1){
15             String str = new String(b,0,length);
16             System.out.print(str);//這裡輸出的是頁面佈局的HTML代碼，對應的漢字還有些是亂碼
17         }
18     }

下麵就是列印出來的東西

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  5 <title>浣跨敤UDP榪涜鏁版嵁鍙戦?佺殑瀹炰緥涓? - Hello.World! - 鍗氬鍥?</title>
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 49 
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 57     <div class="forFlow">
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 64             <a id="cb_post_title_url" class="postTitle2" href="http://www.cnblogs.com/gode/p/5812013.html">浣跨敤UDP榪涜鏁版嵁鍙戦?佺殑瀹炰緥涓?</a>
 65         </h1>
 66         <div class="clear"></div>
 67         <div class="postBody">
 68             <div id="cnblogs_post_body"><p>棣栧厛濡傛灉TCP瀛﹁繃浠ュ悗錛屽啀鐪婾DP榪涜鏁版嵁浼犺緭涔熸槸澶у悓灝忓紓鐨勶紝鍙槸鐢ㄥ埌鐨勭被涓嶅悓</p>
 69 <p>UDP榪涜浼犺緭闇?瑕丏ataSocket鍜孌atapacket綾夥紝Datapacket鍙暟鎹姤錛屾瘡涓?涓暟鎹姤涓嶈兘澶т簬64k錛岄兘璁板綍鐫?鏁版嵁淇℃伅錛屽彂閫佺鐨処P銆佺鍙ｅ彿錛?</p>
 70 <p>浠ュ強瑕佸彂閫佸埌鐨勬帴鏀剁鐨処P銆佺鍙ｅ彿銆?</p>
 71 <p>UDP榪涜浼犺緭鏄皢鏁版嵁鍏ㄩ儴鎵撳寘錛岀劧鍚庝竴璧峰彂榪囧幓錛屽鏄撻?犳垚鏁版嵁涓㈠け錛屼絾閫熷害杈冨揩錛屾瘮濡傝涓嬭澆涓?涓數褰憋紝緙哄け鍑犱睛騫舵病鏈変粈涔堝獎鍝嶏紝浣嗛渶瑕佸揩閫熶笅杞斤紝榪欎釜鏃跺?欏彲浠ラ?夋嫨UDP榪涜浼犺緭錛屾墍璋撳悇鏈夋墍闀匡紝鍏蜂綋閫夋嫨閭ｇ鏂瑰紡榪樻槸瑕佺湅鍏蜂綋闇?瑕併??</p>
 72 <p>鎺ヤ笅鏉ラ檮鍔犱竴涓猆DP榪涜鏂囧瓧浼犺緭錛岀劧鍚庢帴鏀剁鎵撳嵃鍒版帶鍒跺彴涓?</p>
 73 <div class="cnblogs_code">
 74 <pre><span style="color: #008080;"> 1</span> <span style="color: #0000ff;">package</span><span style="color: #000000;"> com.UDP.java;
 75 </span><span style="color: #008080;"> 2</span> 
 76 <span style="color: #008080;"> 3</span> <span style="color: #0000ff;">import</span><span style="color: #000000;"> java.io.IOException;
 77 </span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">import</span><span style="color: #000000;"> java.net.DatagramPacket;
 78 </span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">import</span><span style="color: #000000;"> java.net.DatagramSocket;
 79 </span><span style="color: #008080;"> 6</span> <span style="color: #0000ff;">import</span><span style="color: #000000;"> java.net.InetAddress;
 80 </span><span style="color: #008080;"> 7</span> <span style="color: #0000ff;">import</span><span style="color: #000000;"> org.junit.Test;
 81 </span><span style="color: #008080;"> 8</span> 
 82 <span style="color: #008080;"> 9</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> TestUDP {
 83 </span><span style="color: #008080;">10</span>     <span style="color: #008000;">//</span><span style="color: #008000;"> 鍙戦?佺</span>
 84 <span style="color: #008080;">11</span> <span style="color: #000000;">    @Test
 85 </span><span style="color: #008080;">12</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> send() {
 86 </span><span style="color: #008080;">13</span>         DatagramSocket ds = <span style="color: #0000ff;">null</span><span style="color: #000000;">;
 87 </span><span style="color: #008080;">14</span>         <span style="color: #0000ff;">try</span><span style="color: #000000;"> {
 88 </span><span style="color: #008080;">15</span>             ds = <span style="color: #0000ff;">new</span><span style="color: #000000;"> DatagramSocket();
 89 </span><span style="color: #008080;">16</span>             <span style="color: #008000;">//</span><span style="color: #008000;"> 鍒涘緩涓?涓暟鎹姤錛屾瘡涓?涓暟鎹姤涓嶈兘澶т簬64k錛岄兘璁板綍鐫?鏁版嵁淇℃伅錛屽彂閫佺鐨処P銆佺鍙ｅ彿錛屼互鍙婅鍙戦?佸埌
 90 </span><span style="color: #008080;">17</span>             <span style="color: #008000;">//</span><span style="color: #008000;"> 鐨勬帴鏀剁鐨処P銆佺鍙ｅ彿銆?</span>
 91 <span style="color: #008080;">18</span>             <span style="color: #0000ff;">byte</span>[] b = "鎴戞槸鍙戦?佺"<span style="color: #000000;">.getBytes();
 92 </span><span style="color: #008080;">19</span>             DatagramPacket pack = <span style="color: #0000ff;">new</span> DatagramPacket(b, 0<span style="color: #000000;">, b.length, 
 93 </span><span style="color: #008080;">20</span>                     InetAddress.getByName("192.168.1.101"), 9090<span style="color: #000000;">);
 94 </span><span style="color: #008080;">21</span> <span style="color: #000000;">            ds.send(pack);
 95 </span><span style="color: #008080;">22</span>         } <span style="color: #0000ff;">catch</span><span style="color: #000000;"> (IOException e) {
 96 </span><span style="color: #008080;">23</span> <span style="color: #000000;">            e.printStackTrace();
 97 </span><span style="color: #008080;">24</span>         } <span style="color: #0000ff;">finally</span><span style="color: #000000;"> {
 98 </span><span style="color: #008080;">25</span>             <span style="color: #0000ff;">if</span> (ds != <span style="color: #0000ff;">null</span><span style="color: #000000;">) {
 99 </span><span style="color: #008080;">26</span> <span style="color: #000000;">                ds.close();
100 </span><span style="color: #008080;">27</span> <span style="color: #000000;">            }
101 </span><span style="color: #008080;">28</span> <span style="color: #000000;">        }
102 </span><span style="color: #008080;">29</span> <span style="color: #000000;">    }
103 </span><span style="color: #008080;">30</span> 
104 <span style="color: #008080;">31</span>     <span style="color: #008000;">//</span><span style="color: #008000;"> 鎺ユ敹絝?</span>
105 <span style="color: #008080;">32</span> <span style="color: #000000;">    @Test
106 </span><span style="color: #008080;">33</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> receive() {
107 </span><span style="color: #008080;">34</span>         DatagramSocket ds = <