logreader.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="290" href="#290">290</a> <em>     *</em>
<a name="291" href="#291">291</a> <em>     * @param aFileName The filename of the log/file</em>
<a name="292" href="#292">292</a> <em>     * @param regExpr The regular expression that is to be used</em>
<a name="293" href="#293">293</a> <em>     * @return The line number (counting from 1, not zero) of the first line</em>
<a name="294" href="#294">294</a> <em>     *         that matches the given regular expression. -1 is returned if no</em>
<a name="295" href="#295">295</a> <em>     *         line matches the regular expression. -1 also is returned if </em>
<a name="296" href="#296">296</a> <em>     *         errors occur (file not found, io exception etc.)</em>
<a name="297" href="#297">297</a> <em>     */</em>
<a name="298" href="#298">298</a>     <strong>public</strong> <strong>static</strong> <strong>int</strong> findFirstLineContainingFromSeries(String aFileName, 
<a name="299" href="#299">299</a>                                                         String regExpr)
<a name="300" href="#300">300</a>     {
<a name="301" href="#301">301</a>         <strong>try</strong> {
<a name="302" href="#302">302</a>             <strong>return</strong> findFirstLineContaining(seriesReader(aFileName), regExpr);
<a name="303" href="#303">303</a>         } <strong>catch</strong> (IOException e) {
<a name="304" href="#304">304</a>             e.printStackTrace();
<a name="305" href="#305">305</a>             <strong>return</strong> -1;
<a name="306" href="#306">306</a>         }
<a name="307" href="#307">307</a>     }
<a name="308" href="#308">308</a> 
<a name="309" href="#309">309</a>     <em>/**<em>*</em></em>
<a name="310" href="#310">310</a> <em>     * Return the line number of the first line in the</em>
<a name="311" href="#311">311</a> <em>     * log/file that matches a given regular expression.</em>
<a name="312" href="#312">312</a> <em>     *</em>
<a name="313" href="#313">313</a> <em>     * @param reader The reader of the log/file</em>
<a name="314" href="#314">314</a> <em>     * @param regExpr The regular expression that is to be used</em>
<a name="315" href="#315">315</a> <em>     * @return The line number (counting from 1, not zero) of the first line</em>
<a name="316" href="#316">316</a> <em>     *         that matches the given regular expression. -1 is returned if no</em>
<a name="317" href="#317">317</a> <em>     *         line matches the regular expression. -1 also is returned if </em>
<a name="318" href="#318">318</a> <em>     *         errors occur (file not found, io exception etc.)</em>
<a name="319" href="#319">319</a> <em>     */</em>
<a name="320" href="#320">320</a>     <strong>public</strong> <strong>static</strong> <strong>int</strong> findFirstLineContaining(InputStreamReader reader, 
<a name="321" href="#321">321</a>                                               String regExpr)
<a name="322" href="#322">322</a>     {
<a name="323" href="#323">323</a>         Pattern p = Pattern.compile(regExpr);
<a name="324" href="#324">324</a> 
<a name="325" href="#325">325</a>         <strong>try</strong>{
<a name="326" href="#326">326</a>             BufferedReader bf = <strong>new</strong> BufferedReader(reader, 8192);
<a name="327" href="#327">327</a> 
<a name="328" href="#328">328</a>             String line = <strong>null</strong>;
<a name="329" href="#329">329</a>             <strong>int</strong> i = 1;
<a name="330" href="#330">330</a>             <strong>while</strong> ((line = bf.readLine()) != <strong>null</strong>) {
<a name="331" href="#331">331</a>                 <strong>if</strong>(p.matcher(line).matches()){
<a name="332" href="#332">332</a>                     <em class="comment">// Found a match</em>
<a name="333" href="#333">333</a>                     <strong>return</strong> i;
<a name="334" href="#334">334</a>                 }
<a name="335" href="#335">335</a>                 i++;
<a name="336" href="#336">336</a>             }
<a name="337" href="#337">337</a>         } <strong>catch</strong>(IOException e){
<a name="338" href="#338">338</a>             e.printStackTrace();
<a name="339" href="#339">339</a>         }
<a name="340" href="#340">340</a>         <strong>return</strong> -1;
<a name="341" href="#341">341</a>     }
<a name="342" href="#342">342</a> 
<a name="343" href="#343">343</a>     <em>/**<em>*</em></em>
<a name="344" href="#344">344</a> <em>     * Returns all lines in a log/file matching a given regular expression.  </em>
<a name="345" href="#345">345</a> <em>     * Possible to get lines immediately following the matched line.  Also </em>
<a name="346" href="#346">346</a> <em>     * possible to have each line prepended by it's line number.</em>
<a name="347" href="#347">347</a> <em>     *</em>
<a name="348" href="#348">348</a> <em>     * @param aFileName The filename of the log/file</em>
<a name="349" href="#349">349</a> <em>     * @param regExpr The regular expression that is to be used</em>
<a name="350" href="#350">350</a> <em>     * @param addLines How many lines (in addition to the matched line) to add. </em>
<a name="351" href="#351">351</a> <em>     *                 A value less then 1 will mean that only the matched line </em>
<a name="352" href="#352">352</a> <em>     *                 will be included. If another matched line is hit before </em>
<a name="353" href="#353">353</a> <em>     *                 we reach this limit it will be included and this counter</em>
<a name="354" href="#354">354</a> <em>     *                 effectively reset for it.</em>
<a name="355" href="#355">355</a> <em>     * @param prependLineNumbers If true, then each line will be prepended by </em>
<a name="356" href="#356">356</a> <em>     *                           it's line number in the file.</em>
<a name="357" href="#357">357</a> <em>     * @param skipFirstMatches The first number of matches up to this value will</em>
<a name="358" href="#358">358</a> <em>     *                         be skipped over.</em>
<a name="359" href="#359">359</a> <em>     * @param numberOfMatches Once past matches that are to be skipped this many</em>
<a name="360" href="#360">360</a> <em>     *                        matches will be added to the return value. A</em>
<a name="361" href="#361">361</a> <em>     *                        value of 0 will cause all matching lines to be</em>
<a name="362" href="#362">362</a> <em>     *                        included.</em>
<a name="363" href="#363">363</a> <em>     * @return An array of two strings is returned. At index 0 tall lines in a</em>
<a name="364" href="#364">364</a> <em>     *         log/file matching a given regular expression is located.</em>
<a name="365" href="#365">365</a> <em>     *         At index 1 there is an informational string about how large a</em>
<a name="366" href="#366">366</a> <em>     *         segment of the file is being returned.</em>
<a name="367" href="#367">367</a> <em>     *         Null is returned if errors occur (file not found or io exception)</em>
<a name="368" href="#368">368</a> <em>     *         If a PatternSyntaxException occurs, it's error message will be</em>
<a name="369" href="#369">369</a> <em>     *         returned and the informational string will be empty (not null).</em>
<a name="370" href="#370">370</a> <em>     */</em>
<a name="371" href="#371">371</a>     <strong>public</strong> <strong>static</strong> String[] getByRegExpr(String aFileName,
<a name="372" href="#372">372</a>                                         String regExpr,
<a name="373" href="#373">373</a>                                         <strong>int</strong> addLines,
<a name="374" href="#374">374</a>                                         <strong>boolean</strong> prependLineNumbers,
<a name="375" href="#375">375</a>                                         <strong>int</strong> skipFirstMatches,
<a name="376" href="#376">376</a>                                         <strong>int</strong> numberOfMatches) {
<a name="377" href="#377">377</a>         <strong>try</strong> {
<a name="378" href="#378">378</a>             File f = <strong>new</strong> File(aFileName);
<a name="379" href="#379">379</a>             <strong>return</strong> getByRegExpr(
<a name="380" href="#380">380</a>                     <strong>new</strong> FileReader(f), 
<a name="381" href="#381">381</a>                     regExpr, 
<a name="382" href="#382">382</a>                     addLines, 
<a name="383" href="#383">383</a>                     prependLineNumbers,
<a name="384" href="#384">384</a>                     skipFirstMatches,
<a name="385" href="#385">385</a>                     numberOfMatches,
<a name="386" href="#386">386</a>                     f.length());
<a name="387" href="#387">387</a>         } <strong>catch</strong> (FileNotFoundException e) {
<a name="388" href="#388">388</a>             e.printStackTrace();
<a name="389" href="#389">389</a>             <strong>return</strong> <strong>null</strong>;
<a name="390" href="#390">390</a>         }
<a name="391" href="#391">391</a>     }
<a name="392" href="#392">392</a> 
<a name="393" href="#393">393</a>     <em>/**<em>*</em></em>
<a name="394" href="#394">394</a> <em>     * Returns all lines in a log/file matching a given regular expression.  </em>
<a name="395" href="#395">395</a> <em>     * Possible to get lines immediately following the matched line.  Also </em>
<a name="396" href="#396">396</a> <em>     * possible to have each line prepended by it's line number.</em>
<a name="397" href="#397">397</a> <em>     *</em>
<a name="398" href="#398">398</a> <em>     * @param aFileName The filename of the log/file</em>
<a name="399" href="#399">399</a> <em>     * @param regExpr The regular expression that is to be used</em>
<a name="400" href="#400">400</a> <em>     * @param addLines How many lines (in addition to the matched line) to add. </em>
<a name="401" href="#401">401</a> <em>     *                 A value less then 1 will mean that only the matched line </em>
<a name="402" href="#402">402</a> <em>     *                 will be included. If another matched line is hit before </em>
<a name="403" href="#403">403</a> <em>     *                 we reach this limit it will be included and this counter</em>
<a name="404" href="#404">404</a> <em>     *                 effectively reset for it.</em>
<a name="405" href="#405">405</a> <em>     * @param prependLineNumbers If true, then each line will be prepended by </em>
<a name="406" href="#406">406</a> <em>     *                           it's line number in the file.</em>
<a name="407" href="#407">407</a> <em>     * @param skipFirstMatches The first number of matches up to this value will</em>
<a name="408" href="#408">408</a> <em>     *                         be skipped over.</em>
<a name="409" href="#409">409</a> <em>     * @param numberOfMatches Once past matches that are to be skipped this many</em>
<a name="410" href="#410">410</a> <em>     *                        matches will be added to the return value. A</em>
<a name="411" href="#411">411</a> <em>     *                        value of 0 will cause all matching lines to be</em>
<a name="412" href="#412">412</a> <em>     *                        included.</em>
<a name="413" href="#413">413</a> <em>     * @return An array of two strings is returned. At index 0 tall lines in a</em>
<a name="414" href="#414">414</a> <em>     *         log/file matching a given regular expression is located.</em>
<a name="415" href="#415">415</a> <em>     *         At index 1 there is an informational string about how large a</em>
<a name="416" href="#416">416</a> <em>     *         segment of the file is being returned.</em>
<a name="417" href="#417">417</a> <em>     *         Null is returned if errors occur (file not found or io exception)</em>
<a name="418" href="#418">418</a> <em>     *         If a PatternSyntaxException occurs, it's error message will be</em>
<a name="419" href="#419">419</a> <em>     *         returned and the informational string will be empty (not null).</em>
<a name="420" href="#420">420</a> <em>     */</em>
<a name="421" href="#421">421</a>     <strong>public</strong> <strong>static</strong> String[] getByRegExprFromSeries(String aFileName,
<a name="422" href="#422">422</a>                                       String regExpr,
<a name="423" href="#423">423</a>                                       <strong>int</strong> addLines,
<a name="424" href="#424">424</a>                                       <strong>boolean</strong> prependLineNumbers,
<a name="425" href="#425">425</a>                                       <strong>int</strong> skipFirstMatches,
<a name="426" href="#426">426</a>                                       <strong>int</strong> numberOfMatches) {
<a name="427" href="#427">427</a>         <strong>try</strong> {
<a name="428" href="#428">428</a>             File f = <strong>new</strong> File(aFileName);
<a name="429" href="#429">429</a>             <strong>return</strong> getByRegExpr(
<a name="430" href="#430">430</a>                     seriesReader(aFileName), 
<a name="431" href="#431">431</a>                     regExpr, 
<a name="432" href="#432">432</a>                     addLines, 
<a name="433" href="#433">433</a>                     prependLineNumbers,
<a name="434" href="#434">434</a>                     skipFirstMatches,
<a name="435" href="#435">435</a>                     numberOfMatches,
<a name="436" href="#436">436</a>                     f.length());
<a name="437" href="#437">437</a>         } <strong>catch</strong> (IOException e) {
<a name="438" href="#438">438</a>             e.printStackTrace();