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

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<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getByRegExpr(java.io.InputStreamReader, java.lang.String, int, boolean, int, int, long)">getByRegExpr</A></B>(java.io.InputStreamReader&nbsp;reader,
             java.lang.String&nbsp;regExpr,
             int&nbsp;addLines,
             boolean&nbsp;prependLineNumbers,
             int&nbsp;skipFirstMatches,
             int&nbsp;numberOfMatches,
             long&nbsp;logsize)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all lines in a log/file matching a given regular expression.</TD>
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<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getByRegExpr(java.io.InputStreamReader, java.lang.String, java.lang.String, boolean, int, int, long)">getByRegExpr</A></B>(java.io.InputStreamReader&nbsp;reader,
             java.lang.String&nbsp;regExpr,
             java.lang.String&nbsp;addLines,
             boolean&nbsp;prependLineNumbers,
             int&nbsp;skipFirstMatches,
             int&nbsp;numberOfMatches,
             long&nbsp;logsize)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all lines in a log/file matching a given regular expression.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getByRegExpr(java.lang.String, java.lang.String, int, boolean, int, int)">getByRegExpr</A></B>(java.lang.String&nbsp;aFileName,
             java.lang.String&nbsp;regExpr,
             int&nbsp;addLines,
             boolean&nbsp;prependLineNumbers,
             int&nbsp;skipFirstMatches,
             int&nbsp;numberOfMatches)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all lines in a log/file matching a given regular expression.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getByRegExpr(java.lang.String, java.lang.String, java.lang.String, boolean, int, int)">getByRegExpr</A></B>(java.lang.String&nbsp;aFileName,
             java.lang.String&nbsp;regExpr,
             java.lang.String&nbsp;addLines,
             boolean&nbsp;prependLineNumbers,
             int&nbsp;skipFirstMatches,
             int&nbsp;numberOfMatches)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all lines in a log/file matching a given regular expression.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getByRegExprFromSeries(java.lang.String, java.lang.String, int, boolean, int, int)">getByRegExprFromSeries</A></B>(java.lang.String&nbsp;aFileName,
                       java.lang.String&nbsp;regExpr,
                       int&nbsp;addLines,
                       boolean&nbsp;prependLineNumbers,
                       int&nbsp;skipFirstMatches,
                       int&nbsp;numberOfMatches)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all lines in a log/file matching a given regular expression.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getByRegExprFromSeries(java.lang.String, java.lang.String, java.lang.String, boolean, int, int)">getByRegExprFromSeries</A></B>(java.lang.String&nbsp;aFileName,
                       java.lang.String&nbsp;regExpr,
                       java.lang.String&nbsp;addLines,
                       boolean&nbsp;prependLineNumbers,
                       int&nbsp;skipFirstMatches,
                       int&nbsp;numberOfMatches)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all lines in a log/file matching a given regular expression.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#getFromSeries(java.lang.String, int, int)">getFromSeries</A></B>(java.lang.String&nbsp;aFileName,
              int&nbsp;lineNumber,
              int&nbsp;n)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets a portion of a log spread across a numbered series of files.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#tail(java.io.RandomAccessFile, int)">tail</A></B>(java.io.RandomAccessFile&nbsp;raf,
     int&nbsp;n)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implementation of a unix-like 'tail -n' command</TD>
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<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#tail(java.lang.String)">tail</A></B>(java.lang.String&nbsp;aFileName)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implementation of a unix-like 'tail' command</TD>
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<CODE>static&nbsp;java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/archive/crawler/util/LogReader.html#tail(java.lang.String, int)">tail</A></B>(java.lang.String&nbsp;aFileName,
     int&nbsp;n)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implementation of a unix-like 'tail -n' command</TD>
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&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="LogReader()"><!-- --></A><H3>
LogReader</H3>
<PRE>
public <B>LogReader</B>()</PRE>
<DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
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<B>Method Detail</B></FONT></TH>
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<A NAME="get(java.lang.String)"><!-- --></A><H3>
get</H3>
<PRE>
public static java.lang.String <B>get</B>(java.lang.String&nbsp;aFileName)</PRE>
<DL>
<DD>Returns the entire file. Useful for smaller files.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>aFileName</CODE> - a file name
<DT><B>Returns:</B><DD>The String representation of the entire file.
         Null is returned if errors occur (file not found or io exception)</DL>
</DD>
</DL>
<HR>

<A NAME="get(java.io.InputStreamReader)"><!-- --></A><H3>
get</H3>
<PRE>
public static java.lang.String <B>get</B>(java.io.InputStreamReader&nbsp;reader)</PRE>
<DL>
<DD>Reads entire contents of reader, returns as string.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reader</CODE> - 
<DT><B>Returns:</B><DD>String of entire contents; null for any error.</DL>
</DD>
</DL>
<HR>

<A NAME="get(java.lang.String, int, int)"><!-- --></A><H3>
get</H3>
<PRE>
public static java.lang.String[] <B>get</B>(java.lang.String&nbsp;aFileName,
                                     int&nbsp;lineNumber,
                                     int&nbsp;n)</PRE>
<DL>
<DD>Gets a portion of a log file. Starting at a given line number and the n-1
 lines following that one or until the end of the log if that is reached
 first.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>aFileName</CODE> - The filename of the log/file<DD><CODE>lineNumber</CODE> - The number of the first line to get (if larger then the 
                   file an empty string will be returned)<DD><CODE>n</CODE> - How many lines to return (total, including the one indicated by 
                   lineNumber). If smaller then 1 then an empty string 
                   will be returned.
<DT><B>Returns:</B><DD>An array of two strings is returned. At index 0 a portion of the
         file starting at lineNumber and reaching lineNumber+n is located.
         At index 1 there is an informational string about how large a
         segment of the file is being returned.
         Null is returned if errors occur (file not found or io exception)</DL>
</DD>
</DL>
<HR>

<A NAME="getFromSeries(java.lang.String, int, int)"><!-- --></A><H3>
getFromSeries</H3>
<PRE>
public static java.lang.String[] <B>getFromSeries</B>(java.lang.String&nbsp;aFileName,
                                               int&nbsp;lineNumber,
                                               int&nbsp;n)</PRE>
<DL>
<DD>Gets a portion of a log spread across a numbered series of files.

 Starting at a given line number and the n-1 lines following that
 one or until the end of the log if that is reached
 first.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>aFileName</CODE> - The filename of the log/file<DD><CODE>lineNumber</CODE> - The number of the first line to get (if larger then the
                   file an empty string will be returned)<DD><CODE>n</CODE> - How many lines to return (total, including the one indicated by 
                   lineNumber). If smaller then 1 then an empty string 
                   will be returned.
<DT><B>Returns:</B><DD>An array of two strings is returned. At index 0 a portion of the
         file starting at lineNumber and reaching lineNumber+n is located.
         At index 1 there is an informational string about how large a
         segment of the file is being returned.
         Null is returned if errors occur (file not found or io exception)</DL>