📄 log.htm

📁 这个压缩包里的都是超级经典的java例子
💻 HTM
字号:
<HTML>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<TITLE>Logging a Message in a Servlet (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">
<META CONTENT="no-cache" HTTP-EQUIV="Pragma">
<LINK href="/almanac.css" media="screen" type="text/css" rel="stylesheet">
</HEAD>
<BODY>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD></TD>
</TR>
</TABLE>
<br>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD></TD>
</TR>
<TR>
<TD rowspan="3"><A HREF="/?l=ex"><IMG BORDER="0" ALIGN="BOTTOM" HSPACE="10" SRC="/egs/almanac14a.jpg"></A></TD><TD VALIGN="top">
<h1>The Java Developers Almanac 1.4</h1>
<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">
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD valign="top"><script type="text/javascript">
<!--
google_ad_client = "pub-6001183370374757";
google_ad_width = 120;
google_ad_height = 600;
google_ad_format = "120x600_as";
google_ad_channel = "4777242811";
google_ad_type = "text_image";
google_color_border = "FFFFFF";
google_color_bg = "FFFFFF";
google_color_link = "6666CC";
google_color_url = "6666CC";
google_color_text = "000000";
//--></script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript"></script></TD><TD>&nbsp;&nbsp;&nbsp;</TD><TD valign="top">
<DIV ALIGN="LEFT">
<A HREF="/">Home</A>
    &gt;
    <A HREF="../index.html">List of Packages</A>
    &gt;

    
    <B><A HREF="../javax.servlet/pkg.html">javax.servlet</A></B><font color="#666666" class="xsmall-font">
        &nbsp;[11 examples]
    </font>
</DIV><P>
  <h3>e1039. Logging a Message in a Servlet</h3>

The servlet container provides a simple logging facility for a servlet
to log text messages and exceptions.  For a more full-featured logging
facility, see the <code>java.util.logging</code> package.


<pre>    // See also <a href="../javax.servlet/com_mycompany_MyServlet.html" class="eglink"><b>e1035</b> The Quintessential Servlet</a>
    
    // Add an entry to the log file
    getServletContext().log(<font color="#0066ff"><i>"A message"</i></font>);
    
    try {
        // ...
    } catch (Exception e) {
        // Add an entry to the log file and include an exception
        getServletContext().log(<font color="#0066ff"><i>"An exception occurred"</i></font>, e);
    }
</pre>
Here's a sample of the log entries in Tomcat:

<pre>    2002-07-06 21:12:54 A message
    2002-07-06 21:12:54 An exception occurred
    java.io.IOException
            at com.mycompany.MyServlet.doGet(Unknown Source)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
            ...
</pre>
<P><table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td bgcolor="#6666cc" align="center"><font color="#ffffff">
            &nbsp;<b>Related Examples</b></font></td>
</tr>
</table>


e1035. <a class="eglink" href="com_mycompany_MyServlet.html?l=rel">
    The Quintessential Servlet
</a>
<br>

e1036. <a class="eglink" href="GetInit.html?l=rel">
    Getting and Setting Initialization Parameters for a Servlet
</a>
<br>

e1037. <a class="eglink" href="GetImage.html?l=rel">
    Returning an Image in a Servlet
</a>
<br>

e1038. <a class="eglink" href="State.html?l=rel">
    Saving Data in a Servlet
</a>
<br>


<br>

<br>
<FONT class="xsmall-font">
&copy; 2002 Addison-Wesley.
</FONT></TD><TD>&nbsp;&nbsp;&nbsp;</TD><TD valign="top"><A href="http://compositesw.com/devzone?ref=javaalmanac"><IMG alt="Click Here" height="600" width="120" border="0" src="/csw_oad_120x600_final.gif"></A></TD>
</TR>
</TABLE>
</BODY>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<META CONTENT="NO-CACHE" HTTP-EQUIV="PRAGMA">
</HEAD>
</HTML>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -