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javalearner

在自己的应用中带一个处理日志的工具类，会减少调试代码的编写并节省时间，以下是网上来的一个日志处理类,用的是sun的日志处理包java.util.logging。



  
  可以在jsp或应用程序中如下调用： test.jsp <%@ page import="beartool.LogUtil" %>
<%@ page contentType="text/HTML; charset=gb2312" %> 日志测试
<%
   String s="2345a";
   try{
        int i=Integer.parseInt(s);
    }catch(NumberFormatException e){
        LogUtil.log("发现异常");
        LogUtil.log(e);
   }
%>
  
   
   
     
   
                     
     
   
  
在Tomcat 5.5的日志文件中是如下的输出： 2005-8-7 10:06:07 beartool.LogUtil init
信息: Log started.
2005-8-7 10:06:07 beartool.LogUtil log
信息: 发现异常
2005-8-7 10:06:07 beartool.LogUtil log
警告:
java.lang.NumberFormatException: For input string: "2345a"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:456)
at java.lang.Integer.parseInt(Integer.java:497)
at org.apache.jsp.test_jsp._jspService(org.apache.jsp.test_jsp:50)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)
at javax.Servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:738)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:526)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595) 下面是这个工具类的代码：有四个静态方法用于输出日志

1. /*
   
2. * $Id: LogUtil.java,v 1.1 2003/06/17 01:14:03 jack Exp $
   
3. *
   
4. */
   
5. package beartool;
   
6. import java.util.logging.*;
   
7. /**
   
8. * @author         JACK        (Jun 15, 2003)
   
9. * @class         LogUtil
   
10. */
    
11. public class LogUtil {
    
12.         private static Logger logger;
    
13.         private static boolean loggable;
    
14.         public LogUtil() {
    
15.         }
    
16.        
    
17.         private static boolean init() {
    
18.                 if(loggable)
    
19.                         return loggable;
    
20.                 try {
    
21.                         logger = Logger.getLogger("beartool");
    
22.                         // Use the default logger with Tomcat.
    
23.                         // All details will be logged in file: launcher.server.log
    
24.                         // under directory logs.
    
25.                        
    
26.                         // Log every details.
    
27.                         logger.setLevel(Level.ALL);
    
28.                         // Testing.
    
29.                         logger.info("Log started.");
    
30.                 }catch(Exception e) {
    
31.                         return false;
    
32.                 }
    
33.                
    
34.                 loggable = true;
    
35.                 return loggable;       
    
36.         }
    
37.         public static boolean log(Level level, String mesg) {
    
38.                 if(! init()) return false;
    
39.                 logger.log(level, mesg);
    
40.                 return true;
    
41.         }
    
42.        
    
43.         public static boolean log(String mesg) {
    
44.                 return log(Level.INFO, mesg);
    
45.         }
    
46.        
    
47.         public static boolean log(Level level, String mesg,  Throwable throwable) {
    
48.                 if(! init()) return false;
    
49.                 logger.log(level, mesg, throwable);
    
50.                 return true;
    
51.         }
    
52.        
    
53.         public static boolean log(Throwable throwable) {
    
54.                 return log(Level.WARNING, "", throwable);
    
55.         }
    
56. }
    

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源码下载：http://file.javaxxz.com/2014/10/1/025524844.zip