?? logmethod.html
字號(hào):
<HTML>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<TITLE>Logging a Method Call
(Java Developers Almanac Example)
</TITLE>
<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
<META CONTENT="Addison-Wesley/Patrick Chan" NAME="OWNER">
<META CONTENT="3/20/02" NAME="revision">
<STYLE TYPE="text/css">
<!-- BODY CODE {font-family: Courier, Monospace; font-size: 11pt} TABLE, BODY {font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt} PRE {font-family: Courier, Monospace; font-size: 10pt} H3 {font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11pt} A.eglink {text-decoration: none} A:hover.eglink {text-decoration: underline} -->
</STYLE>
</HEAD>
<BODY>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD rowspan="3"><A HREF="/?l=ex"><IMG BORDER="0" ALIGN="BOTTOM" HSPACE="10" SRC="/egs/almanac14a.jpg"></A></TD><TD VALIGN="top"><font face="Times" size="6"><b>The Java Developers Almanac 1.4</b></font>
<br>
Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
</TD>
</TR>
<TR>
<TD align="right" valign="bottom">
<FORM method="get" action="/cgi-bin/search/find.pl">
<INPUT size="25" name="words" type="text"><INPUT value="Search" type="submit">
</FORM>
</TD>
</TR>
</TABLE>
<HR color="#6666cc">
<DIV ALIGN="LEFT">
<A HREF="/">Home</A>
>
<A HREF="../index.html">List of Packages</A>
>
<B><A HREF="../java.util.logging/pkg.html">java.util.logging</A></B><font color="#666666" SIZE="-2">
[20 examples]
</font>
</DIV><P>
<h3>
e387.
Logging a Method Call</h3>
The logger provides convenience methods <code>Logger.entering()</code> and
<code>Logger.exiting()</code> for logging method calls. This example implements a
method that logs the parameters upon entry and the result when returning.
<P>
See also <a href="../java.util.logging/LogExcept.html" class="eglink"><font size="-1"><b>e388</b> Logging an Exception</font></a>.
<pre>
package <font color="#0066ff"><i>com.mycompany</i></font>;
class <font color="#0066ff"><i>MyClass</i></font> {
public boolean <font color="#0066ff"><i>myMethod</i></font>(int p1, Object p2) {
// Log entry
Logger logger = Logger.getLogger(<font color="#0066ff"><i>"com.mycompany.MyClass"</i></font>);
if (logger.isLoggable(Level.FINER)) {
logger.entering(this.getClass().getName(), <font color="#0066ff"><i>"myMethod"</i></font>,
new Object[]{new Integer(p1), p2});
}
// Method body
// Log exit
boolean result = <font color="#0066ff"><i>true</i></font>;
if (logger.isLoggable(Level.FINER)) {
logger.exiting(this.getClass().getName(), <font color="#0066ff"><i>"myMethod"</i></font>, new Boolean(result));
// Use the following if the method does not return a value
logger.exiting(this.getClass().getName(), <font color="#0066ff"><i>"myMethod"</i></font>);
}
return result;
}
}
</pre>
Here is a sample of the output using a simple formatter and the
following call:
<pre>
new <font color="#0066ff"><i>com.mycompany.MyClass</i></font>().<font color="#0066ff"><i>myMethod</i></font>(<font color="#0066ff"><i>123</i></font>, <font color="#0066ff"><i>"hello"</i></font>);
Jan 10, 2002 7:59:48 PM com.mycompany.MyClass myMethod
FINER: ENTRY 123 hello
Jan 10, 2002 7:59:49 PM com.mycompany.MyClass myMethod
FINER: RETURN true
Jan 10, 2002 7:59:49 PM com.mycompany.MyClass myMethod
FINER: RETURN
</pre>
<P><table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td bgcolor="#6666cc" align="center"><font color="#ffffff">
Related Examples
</font></td>
</tr>
</table>
e385. <a class="eglink" href="BasicLogging.html?l=rel">
The Quintessential Logging Program
</a>
<br>
e386. <a class="eglink" href="IsLog.html?l=rel">
Determining If a Message Will Be Logged
</a>
<br>
e388. <a class="eglink" href="LogExcept.html?l=rel">
Logging an Exception
</a>
<br>
e389. <a class="eglink" href="Minimize.html?l=rel">
Minimizing the Impact of Logging Code
</a>
<br>
e390. <a class="eglink" href="NoParent.html?l=rel">
Preventing a Logger from Forwarding Log Records to its Parent
</a>
<br>
e391. <a class="eglink" href="LogFile.html?l=rel">
Writing Log Records to a Log File
</a>
<br>
e392. <a class="eglink" href="LogConsole.html?l=rel">
Writing Log Records to Standard Error
</a>
<br>
e393. <a class="eglink" href="LogMemory.html?l=rel">
Writing Log Records Only After a Condition Occurs
</a>
<br>
e394. <a class="eglink" href="SetFilter.html?l=rel">
Setting a Filter on a Logger Handler
</a>
<br>
<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td align="left">
<br>
See also:
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Configuration">
Configuration
</a>
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#File%20Size">
File Size
</a>
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Formatters">
Formatters
</a>
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Levels">
Levels
</a>
</td>
</tr>
</table>
<br>
<br>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="0">
© 2002 Addison-Wesley.
</FONT>
</BODY>
</HTML>
?? 快捷鍵說明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -