判断IP是否合法代码,Java代码库,德仔网

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【Java】判断IP是否合法
作者: / 发布于2011/1/14/ 493
<div><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> IP {

 </span><span style="color: #0000ff">final</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String PATTERN_IP </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">192\\.168\\.(?:25[0-5]|2[0-4]\\d|\\d|[1-9]\\d|1\\d\\d)\\.(?:25[0-5]|2[0-4]\\d|\\d|[1-9]\\d|1\\d\\d)</span><span style="color: #000000">"</span><span style="color: #000000">;

 </span><span style="color: #008000">/*</span><span style="color: #008000">
 * 比较IP大小 ，s<e返回-，s>e返回+，否则返回0
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> compare(String sIP, String eIP) {

 String[] s1 </span><span style="color: #000000">=</span><span style="color: #000000"> sIP.split(</span><span style="color: #000000">"</span><span style="color: #000000">\\.</span><span style="color: #000000">"</span><span style="color: #000000">);
 String[] e1 </span><span style="color: #000000">=</span><span style="color: #000000"> eIP.split(</span><span style="color: #000000">"</span><span style="color: #000000">\\.</span><span style="color: #000000">"</span><span style="color: #000000">);

 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> i </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">; i </span><span style="color: #000000"><</span><span style="color: #000000"> s1.length; i</span><span style="color: #000000">++</span><span style="color: #000000">) {

 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (Integer.parseInt(s1[i]) </span><span style="color: #000000"><</span><span style="color: #000000"> Integer.parseInt(e1[i])) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #000000">1</span><span style="color: #000000">;
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (Integer.parseInt(s1[i]) </span><span style="color: #000000">></span><span style="color: #000000"> Integer.parseInt(e1[i])) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000">;
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
 </span><span style="color: #0000ff">continue</span><span style="color: #000000">;
 }
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">;
 }

 </span><span style="color: #008000">/*</span><span style="color: #008000">
 * 判断IP是否合法
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> is_IP(String ip) {

 Pattern p </span><span style="color: #000000">=</span><span style="color: #000000"> Pattern.compile(PATTERN_IP);
 Matcher m </span><span style="color: #000000">=</span><span style="color: #000000"> p.matcher(ip);
 </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> b </span><span style="color: #000000">=</span><span style="color: #000000"> m.matches();
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (b) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;

 }

}</span>
</div>
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