从指定的字符串中提取Email代码,Java代码库,德仔网

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【Java】从指定的字符串中提取Email
作者: / 发布于2011/1/14/ 846
<div> <span style="color: #008000">/**</span><span style="color: #008000">
 * 从指定的字符串中提取Email
 * content 指定的字符串
 </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"> String parse(String content) {
 String email </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (content</span><span style="color: #000000">==</span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> content.length()</span><span style="color: #000000"><</span><span style="color: #000000">1</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> email;
 }
 </span><span style="color: #008000">//</span><span style="color: #008000">找出含有@</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> beginPos;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> i;
 String token </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">@</span><span style="color: #000000">"</span><span style="color: #000000">;
 String preHalf</span><span style="color: #000000">=</span><span style="color: #000000">""</span><span style="color: #000000">;
 String sufHalf </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">""</span><span style="color: #000000">;
 
 beginPos </span><span style="color: #000000">=</span><span style="color: #000000"> content.indexOf(token);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (beginPos</span><span style="color: #000000">>-</span><span style="color: #000000">1</span><span style="color: #000000">) {
 </span><span style="color: #008000">//</span><span style="color: #008000">前项扫描</span><span style="color: #008000">
</span><span style="color: #000000"> String s </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 i</span><span style="color: #000000">=</span><span style="color: #000000"> beginPos;
 </span><span style="color: #0000ff">while</span><span style="color: #000000">(i</span><span style="color: #000000">></span><span style="color: #000000">0</span><span style="color: #000000">) {
 s </span><span style="color: #000000">=</span><span style="color: #000000"> content.substring(i</span><span style="color: #000000">-</span><span style="color: #000000">1</span><span style="color: #000000">,i);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (isLetter(s))
 preHalf </span><span style="color: #000000">=</span><span style="color: #000000"> s</span><span style="color: #000000">+</span><span style="color: #000000">preHalf;
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 </span><span style="color: #0000ff">break</span><span style="color: #000000">;
 i</span><span style="color: #000000">--</span><span style="color: #000000">;
 }
 </span><span style="color: #008000">//</span><span style="color: #008000">后项扫描</span><span style="color: #008000">
</span><span style="color: #000000"> i</span><span style="color: #000000">=</span><span style="color: #000000"> beginPos</span><span style="color: #000000">+</span><span style="color: #000000">1</span><span style="color: #000000">;
 </span><span style="color: #0000ff">while</span><span style="color: #000000">( i</span><span style="color: #000000"><</span><span style="color: #000000">content.length()) {
 s </span><span style="color: #000000">=</span><span style="color: #000000"> content.substring(i,i</span><span style="color: #000000">+</span><span style="color: #000000">1</span><span style="color: #000000">);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (isLetter(s))
 sufHalf </span><span style="color: #000000">=</span><span style="color: #000000"> sufHalf </span><span style="color: #000000">+</span><span style="color: #000000">s;
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 </span><span style="color: #0000ff">break</span><span style="color: #000000">;
 i</span><span style="color: #000000">++</span><span style="color: #000000">; 
 }
 </span><span style="color: #008000">//</span><span style="color: #008000">判断合法性</span><span style="color: #008000">
</span><span style="color: #000000"> email </span><span style="color: #000000">=</span><span style="color: #000000"> preHalf </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">@</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> sufHalf;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (isEmail(email)) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> email;
 }
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
}

</span><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断是不是合法Email
 * email Email地址
 </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"> isEmail(String email) {
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (email</span><span style="color: #000000">==</span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> email.length()</span><span style="color: #000000"><</span><span style="color: #000000">1</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> email.length()</span><span style="color: #000000">></span><span style="color: #000000">256</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">;
 }
 
 String check </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">^([0-9a-zA-Z]+[_.0-9a-zA-Z-]+)@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2,3})$</span><span style="color: #000000">"</span><span style="color: #000000">;
 Pattern regex </span><span style="color: #000000">=</span><span style="color: #000000"> Pattern.compile(check);
 Matcher matcher </span><span style="color: #000000">=</span><span style="color: #000000"> regex.matcher(email);
 </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isMatched </span><span style="color: #000000">=</span><span style="color: #000000"> matcher.matches();
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(isMatched) {
 </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">else</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><span style="color: #0000ff">catch</span><span style="color: #000000"> (RuntimeException e) {
 </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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