archiveutils.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="505" href="#505">505</a>     
<a name="506" href="#506">506</a>     <em>/**<em>*</em></em>
<a name="507" href="#507">507</a> <em>     * Convert milliseconds value to a human-readable duration</em>
<a name="508" href="#508">508</a> <em>     * @param time</em>
<a name="509" href="#509">509</a> <em>     * @param toMs whether to print to the ms</em>
<a name="510" href="#510">510</a> <em>     * @return Human readable string version of passed &lt;code>time&lt;/code></em>
<a name="511" href="#511">511</a> <em>     */</em>
<a name="512" href="#512">512</a>     <strong>public</strong> <strong>static</strong> String formatMillisecondsToConventional(<strong>long</strong> time, <strong>boolean</strong> toMs) {
<a name="513" href="#513">513</a>         StringBuffer sb = <strong>new</strong> StringBuffer();
<a name="514" href="#514">514</a>         <strong>if</strong>(time&lt;0) {
<a name="515" href="#515">515</a>             sb.append(<span class="string">"-"</span>);
<a name="516" href="#516">516</a>         }
<a name="517" href="#517">517</a>         <strong>long</strong> absTime = Math.abs(time);
<a name="518" href="#518">518</a>         <strong>if</strong>(!toMs &amp;&amp; absTime &lt; 1000) {
<a name="519" href="#519">519</a>             <strong>return</strong> <span class="string">"0s"</span>;
<a name="520" href="#520">520</a>         }
<a name="521" href="#521">521</a>         <strong>if</strong>(absTime > DAY_IN_MS) {
<a name="522" href="#522">522</a>             <em class="comment">// days</em>
<a name="523" href="#523">523</a>             sb.append(absTime / DAY_IN_MS + <span class="string">"d"</span>);
<a name="524" href="#524">524</a>             absTime = absTime % DAY_IN_MS;
<a name="525" href="#525">525</a>         }
<a name="526" href="#526">526</a>         <strong>if</strong> (absTime > HOUR_IN_MS) {
<a name="527" href="#527">527</a>             <em class="comment">//got hours.</em>
<a name="528" href="#528">528</a>             sb.append(absTime / HOUR_IN_MS + <span class="string">"h"</span>);
<a name="529" href="#529">529</a>             absTime = absTime % HOUR_IN_MS;
<a name="530" href="#530">530</a>         }
<a name="531" href="#531">531</a>         <strong>if</strong> (absTime > 60000) {
<a name="532" href="#532">532</a>             sb.append(absTime / 60000 + <span class="string">"m"</span>);
<a name="533" href="#533">533</a>             absTime = absTime % 60000;
<a name="534" href="#534">534</a>         }
<a name="535" href="#535">535</a>         <strong>if</strong> (absTime > 1000) {
<a name="536" href="#536">536</a>             sb.append(absTime / 1000 + <span class="string">"s"</span>);
<a name="537" href="#537">537</a>             absTime = absTime % 1000;
<a name="538" href="#538">538</a>         }
<a name="539" href="#539">539</a>         <strong>if</strong>(toMs) {
<a name="540" href="#540">540</a>             sb.append(absTime + <span class="string">"ms"</span>);
<a name="541" href="#541">541</a>         }
<a name="542" href="#542">542</a>         <strong>return</strong> sb.toString();
<a name="543" href="#543">543</a>     }
<a name="544" href="#544">544</a> 
<a name="545" href="#545">545</a> 
<a name="546" href="#546">546</a>     <em>/**<em>*</em></em>
<a name="547" href="#547">547</a> <em>     * Generate a long UID based on the given class and version number.</em>
<a name="548" href="#548">548</a> <em>     * Using this instead of the default will assume serialization</em>
<a name="549" href="#549">549</a> <em>     * compatibility across class changes unless version number is</em>
<a name="550" href="#550">550</a> <em>     * intentionally bumped.</em>
<a name="551" href="#551">551</a> <em>     *</em>
<a name="552" href="#552">552</a> <em>     * @param class1</em>
<a name="553" href="#553">553</a> <em>     * @param version</em>
<a name="554" href="#554">554</a> <em>     * @return UID based off class and version number.</em>
<a name="555" href="#555">555</a> <em>     */</em>
<a name="556" href="#556">556</a>     <strong>public</strong> <strong>static</strong> <strong>long</strong> <strong>class</strong>nameBasedUID(Class <strong>class</strong>1, <strong>int</strong> version) {
<a name="557" href="#557">557</a>         String callingClassname = <strong>class</strong>1.getName();
<a name="558" href="#558">558</a>         <strong>return</strong> (<strong>long</strong>)callingClassname.hashCode() &lt;&lt; 32 + version;
<a name="559" href="#559">559</a>     }
<a name="560" href="#560">560</a>     
<a name="561" href="#561">561</a>     <em>/**<em>*</em></em>
<a name="562" href="#562">562</a> <em>     * Copy the raw bytes of a long into a byte array, starting at</em>
<a name="563" href="#563">563</a> <em>     * the specified offset.</em>
<a name="564" href="#564">564</a> <em>     * </em>
<a name="565" href="#565">565</a> <em>     * @param l</em>
<a name="566" href="#566">566</a> <em>     * @param array</em>
<a name="567" href="#567">567</a> <em>     * @param offset</em>
<a name="568" href="#568">568</a> <em>     */</em>
<a name="569" href="#569">569</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> <strong>long</strong>IntoByteArray(<strong>long</strong> l, byte[] array, <strong>int</strong> offset) {
<a name="570" href="#570">570</a>         <strong>int</strong> i, shift;
<a name="571" href="#571">571</a>                   
<a name="572" href="#572">572</a>         <strong>for</strong>(i = 0, shift = 56; i &lt; 8; i++, shift -= 8)
<a name="573" href="#573">573</a>         array[offset+i] = (byte)(0xFF &amp; (l >> shift));
<a name="574" href="#574">574</a>     }
<a name="575" href="#575">575</a>     
<a name="576" href="#576">576</a>     <strong>public</strong> <strong>static</strong> <strong>long</strong> byteArrayIntoLong(byte [] bytearray) {
<a name="577" href="#577">577</a>         <strong>return</strong> byteArrayIntoLong(bytearray, 0);
<a name="578" href="#578">578</a>     }
<a name="579" href="#579">579</a>     
<a name="580" href="#580">580</a>     <em>/**<em>*</em></em>
<a name="581" href="#581">581</a> <em>     * Byte array into long.</em>
<a name="582" href="#582">582</a> <em>     * @param bytearray Array to convert to a long.</em>
<a name="583" href="#583">583</a> <em>     * @param offset Offset into array at which we start decoding the long.</em>
<a name="584" href="#584">584</a> <em>     * @return Long made of the bytes of &lt;code>array&lt;/code> beginning at</em>
<a name="585" href="#585">585</a> <em>     * offset &lt;code>offset&lt;/code>.</em>
<a name="586" href="#586">586</a> <em>     * @see #longIntoByteArray(long, byte[], int)</em>
<a name="587" href="#587">587</a> <em>     */</em>
<a name="588" href="#588">588</a>     <strong>public</strong> <strong>static</strong> <strong>long</strong> byteArrayIntoLong(byte [] bytearray,
<a name="589" href="#589">589</a>             <strong>int</strong> offset) {
<a name="590" href="#590">590</a>         <strong>long</strong> result = 0;
<a name="591" href="#591">591</a>         <strong>for</strong> (<strong>int</strong> i = offset; i &lt; 8 <em class="comment">/*<em class="comment">Bytes in long*/</em>; i++) {</em>
<a name="592" href="#592">592</a>             result = (result &lt;&lt; 8 <em class="comment">/*<em class="comment">Bits in byte*/</em>) |</em>
<a name="593" href="#593">593</a>                 (0xff &amp; (byte)(bytearray[i] &amp; 0xff));
<a name="594" href="#594">594</a>         }
<a name="595" href="#595">595</a>         <strong>return</strong> result;
<a name="596" href="#596">596</a>     }
<a name="597" href="#597">597</a> 
<a name="598" href="#598">598</a>     <em>/**<em>*</em></em>
<a name="599" href="#599">599</a> <em>     * Given a string that may be a plain host or host/path (without</em>
<a name="600" href="#600">600</a> <em>     * URI scheme), add an implied <a href="http://" target="alexandria_uri">http://</a> if necessary. </em>
<a name="601" href="#601">601</a> <em>     * </em>
<a name="602" href="#602">602</a> <em>     * @param u string to evaluate</em>
<a name="603" href="#603">603</a> <em>     * @return string with <a href="http://" target="alexandria_uri">http://</a> added if no scheme already present</em>
<a name="604" href="#604">604</a> <em>     */</em>
<a name="605" href="#605">605</a>     <strong>public</strong> <strong>static</strong> String addImpliedHttpIfNecessary(String u) {
<a name="606" href="#606">606</a>         <strong>if</strong>(u.indexOf(':') == -1 || u.indexOf('.') &lt; u.indexOf(':')) {
<a name="607" href="#607">607</a>             <em class="comment">// No scheme present; prepend "http://"</em>
<a name="608" href="#608">608</a>             u = <span class="string">"http://"</span> + u;
<a name="609" href="#609">609</a>         }
<a name="610" href="#610">610</a>         <strong>return</strong> u;
<a name="611" href="#611">611</a>     }
<a name="612" href="#612">612</a> 
<a name="613" href="#613">613</a>     <em>/**<em>*</em></em>
<a name="614" href="#614">614</a> <em>     * Verify that the array begins with the prefix. </em>
<a name="615" href="#615">615</a> <em>     * </em>
<a name="616" href="#616">616</a> <em>     * @param array</em>
<a name="617" href="#617">617</a> <em>     * @param prefix</em>
<a name="618" href="#618">618</a> <em>     * @return true if array is identical to prefix for the first prefix.length</em>
<a name="619" href="#619">619</a> <em>     * positions </em>
<a name="620" href="#620">620</a> <em>     */</em>
<a name="621" href="#621">621</a>     <strong>public</strong> <strong>static</strong> <strong>boolean</strong> startsWith(byte[] array, byte[] prefix) {
<a name="622" href="#622">622</a>         <strong>if</strong>(prefix.length>array.length) {
<a name="623" href="#623">623</a>             <strong>return</strong> false;
<a name="624" href="#624">624</a>         }
<a name="625" href="#625">625</a>         <strong>for</strong>(<strong>int</strong> i = 0; i &lt; prefix.length; i++) {
<a name="626" href="#626">626</a>             <strong>if</strong>(array[i]!=prefix[i]) {
<a name="627" href="#627">627</a>                 <strong>return</strong> false; 
<a name="628" href="#628">628</a>             }
<a name="629" href="#629">629</a>         }
<a name="630" href="#630">630</a>         <strong>return</strong> <strong>true</strong>; 
<a name="631" href="#631">631</a>     }
<a name="632" href="#632">632</a> 
<a name="633" href="#633">633</a>     <em>/**<em>*</em></em>
<a name="634" href="#634">634</a> <em>     * Utility method to get a String singleLineReport from Reporter</em>
<a name="635" href="#635">635</a> <em>     * @param rep  Reporter to get singleLineReport from</em>
<a name="636" href="#636">636</a> <em>     * @return String of report</em>
<a name="637" href="#637">637</a> <em>     */</em>
<a name="638" href="#638">638</a>     <strong>public</strong> <strong>static</strong> String singleLineReport(<a href="../../../org/archive/util/Reporter.html">Reporter</a> rep) {
<a name="639" href="#639">639</a>         StringWriter sw = <strong>new</strong> StringWriter();
<a name="640" href="#640">640</a>         PrintWriter pw = <strong>new</strong> PrintWriter(sw);
<a name="641" href="#641">641</a>         <strong>try</strong> {
<a name="642" href="#642">642</a>             rep.singleLineReportTo(pw);
<a name="643" href="#643">643</a>         } <strong>catch</strong> (IOException e) {
<a name="644" href="#644">644</a>             <em class="comment">// not really possible</em>
<a name="645" href="#645">645</a>             e.printStackTrace();
<a name="646" href="#646">646</a>         }
<a name="647" href="#647">647</a>         pw.flush();
<a name="648" href="#648">648</a>         <strong>return</strong> sw.toString();
<a name="649" href="#649">649</a>     }
<a name="650" href="#650">650</a> 
<a name="651" href="#651">651</a>     <em>/**<em>*</em></em>
<a name="652" href="#652">652</a> <em>     * Compose the requested report into a String. DANGEROUS IF REPORT</em>
<a name="653" href="#653">653</a> <em>     * CAN BE LARGE.</em>
<a name="654" href="#654">654</a> <em>     * </em>
<a name="655" href="#655">655</a> <em>     * @param rep Reported</em>
<a name="656" href="#656">656</a> <em>     * @param name String name of report to compose</em>
<a name="657" href="#657">657</a> <em>     * @return String of report</em>
<a name="658" href="#658">658</a> <em>     */</em>
<a name="659" href="#659">659</a>     <strong>public</strong> <strong>static</strong> String writeReportToString(<a href="../../../org/archive/util/Reporter.html">Reporter</a> rep, String name) {
<a name="660" href="#660">660</a>         StringWriter sw = <strong>new</strong> StringWriter();
<a name="661" href="#661">661</a>         PrintWriter pw = <strong>new</strong> PrintWriter(sw);
<a name="662" href="#662">662</a>         rep.reportTo(name,pw);
<a name="663" href="#663">663</a>         pw.flush();
<a name="664" href="#664">664</a>         <strong>return</strong> sw.toString();
<a name="665" href="#665">665</a>     }
<a name="666" href="#666">666</a> }
<a name="667" href="#667">667</a> 
</pre>
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