Java Web Project自定义错误页面，log4j记录日志。

创建记录日志的文件LoggerHelper.java:

 1 package com.wyp.helper;
 2 
 3 import org.apache.log4j.Logger;
 4 
 5 public class LoggerHelper {
 6     private static Logger _logger = Logger.getLogger(LoggerHelper.class);
 7     private static String newLine = System.getProperty("line.separator");
 8 
 9     public static void info(Logger logger, String message) {
10         logger.info(newLine);
11         logger.info(message);
12     }
13 
14     public static void info(Logger logger, String message, Throwable exception) {
15         logger.info(newLine);
16         logger.info(message, exception);
17     }
18 
19     public static void debug(Logger logger, String message) {
20         logger.debug(newLine);
21         logger.debug(message);
22     }
23 
24     public static void debug(Logger logger, String message, Throwable exception) {
25         logger.debug(newLine);
26         logger.debug(message, exception);
27     }
28 
29     public static void error(Logger logger, String message) {
30         logger.error(newLine);
31         logger.error(message);
32     }
33 
34     public static void error(Logger logger, String message, Throwable exception) {
35         logger.error(newLine);
36         logger.error(message, exception);
37     }
38 
39     public static void info(String message) {
40         _logger.info(newLine);
41         _logger.info(message);
42     }
43 
44     public static void info(String message, Throwable exception) {
45         _logger.info(newLine);
46         _logger.info(message, exception);
47     }
48 
49     public static void debug(String message) {
50         _logger.debug(newLine);
51         _logger.debug(message);
52     }
53 
54     public static void debug(String message, Throwable exception) {
55         _logger.debug(newLine);
56         _logger.debug(message, exception);
57     }
58 
59     public static void error(String message) {
60         _logger.error(newLine);
61         _logger.error(message);
62     }
63 
64     public static void error(String message, Throwable exception) {
65         _logger.error(newLine);
66         _logger.error(message, exception);
67     }
68 
69 }

LoggerHelper