轉載自： http://blog.csdn.net/seven_cm/article/details/26849821

自定義log4j日誌級別

參考了網上資料： http://www.360doc.com/content/13/0527/11/10825198_288498671.shtml

因為項目中需要輸出一些特別的日誌來做數據統計。如果開啟log4j提供的INFO日誌級別，每天生成的日誌文件就會變得越來越大。這樣就得寫個定 時任務來刪除這個文件。為了只輸出所需的日誌級別，唯有自己定義一個log4j的級別，這樣一來就好控制了，而且不需要對之前的代碼進行修改。好了，廢話 不多說，上代碼：

1、CustomerLog

1. package common.log;
3. import org.apache.log4j.Level;
4. import org.apache.log4j.Logger;
5. import org.apache.log4j.net.SyslogAppender;
7. public class CustomerLog {
9. /**
10. * 繼承Level
11. * @author Sevencm
12. *
13. */
14. private static class CustomerLogLevel extends Level{
15. public CustomerLogLevel(int level, String levelStr, int syslogEquivalent) {
16. super(level, levelStr, syslogEquivalent);
17. }
18. }
20. /**
21. * 自定義級別名稱，以及級別範圍
22. */
23. private static final Level CustomerLevel = new CustomerLogLevel(20050,"CUSTOMER",SyslogAppender.LOG_LOCAL0);
25. /**
26. * 使用日誌打印logger中的log方法
27. *
28. * @param logger
29. * @param objLogInfo
30. */
31. public static void customerLog(Logger logger,Object objLogInfo){
32. logger.log(CustomerLevel, objLogInfo);
33. }
37. }

1. package common.log;
3. import org.apache.log4j.spi.Filter;
4. import org.apache.log4j.spi.LoggingEvent;
6. public class CustomerLogFilter extends Filter {
7. boolean acceptOnMatch = false;
8. private String levelMin;
9. private String levelMax;
15. public String getLevelMin() {
16. return levelMin;
17. }
21. public void setLevelMin(String levelMin) {
22. this.levelMin = levelMin;
23. }
27. public String getLevelMax() {
28. return levelMax;
29. }
33. public void setLevelMax(String levelMax) {
34. this.levelMax = levelMax;
35. }
39. public boolean isAcceptOnMatch() {
40. return acceptOnMatch;
41. }
45. public void setAcceptOnMatch(boolean acceptOnMatch) {
46. this.acceptOnMatch = acceptOnMatch;
47. }
50. @Override
51. public int decide(LoggingEvent lgEvent) {
52. int inputLevel = lgEvent.getLevel().toInt();
54. if(inputLevel>=getLevel(levelMin) && inputLevel <= getLevel(levelMax)){
55. return 0;
56. }
58. return -1;
59. }
61. private int getLevel(String level){
62. level = level.toUpperCase();
63. if(level.equals("CUSTOMER")){
64. return LevelType.CUSTOMER.getType();
65. }
66. if(level.equals("OFF")){
67. return LevelType.OFF.getType();
68. }
69. if(level.equals("FATAL")){
70. return LevelType.FATAL.getType();
71. }
72. if(level.equals("ERROR")){
73. return LevelType.ERROR.getType();
74. }
75. if(level.equals("INFO")){
76. return LevelType.INFO.getType();
77. }
78. if(level.equals("WARN")){
79. return LevelType.WARN.getType();
80. }
81. if(level.equals("DEBUG")){
82. return LevelType.DEBUG.getType();
83. }
84. if(level.equals("ALL")){
85. return LevelType.ALL.getType();
86. }
87. return LevelType.OFF.getType();
88. }
90. private static enum LevelType{
92. OFF(2147483647),
94. FATAL(50000),
96. ERROR(40000),
98. WARN(30000),
100. INFO(20000),
102. DEBUG(10000),
104. ALL(-2147483648),
106. CUSTOMER(20050);
108. int type;
110. public int getType() {
111. return type;
112. }
114. private LevelType(int type) {
115. this.type = type;
116. }
117. }
119. }

1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
4. <log4j:configuration xmlns:log4j=‘http://jakarta.apache.org/log4j/‘ >
7. <appender name="Console" class="org.apache.log4j.ConsoleAppender">
8. <layout class="org.apache.log4j.PatternLayout">
9. <param name="ConversionPattern" value="%d [%p] %c{1} - %m%n" />
10. </layout>
11. <!--過濾器設置輸出的級別 -->
12. <filter class="common.log.CustomerLogFilter">
13. <param name="levelMin" value="info" />
14. <param name="levelMax" value="Customer" />
15. <param name="AcceptOnMatch" value="true" />
16. </filter>
17. </appender>
19. <!-- 根logger的設置-->
20. <root>
21. <priority value ="INFO"/>
22. <appender-ref ref="Console"/>
23. </root>
24. </log4j:configuration>

1. package common.test;
3. import org.apache.log4j.Logger;
5. import common.log.CustomerLog;
7. public class Test {
8. private static final Logger logger = Logger.getLogger("customer");
10. public static void main(String[] args) {
11. CustomerLog.customerLog(logger, "自定義日誌級別");
12. logger.info("哈哈哈哈");
13. }
14. }

2014-05-24 17:22:45,647 [CUSTOMER] customer - 自定義日誌級別
2014-05-24 17:22:45,648 [INFO] customer - 哈哈哈哈

6、通過修改

1. <param name="levelMin" value="info" />

上面的 Value 值來控制日誌的輸出級別。

另外說明常用log4j日誌級別具體值：

public class Level extends Priority
implements Serializable {
public static final int TRACE_INT = 5000;
public static final Level OFF = new Level(2147483647, "OFF", 0);

public static final Level FATAL = new Level(50000, "FATAL", 0);

public static final Level ERROR = new Level(40000, "ERROR", 3);

public static final Level WARN = new Level(30000, "WARN", 4);

public static final Level INFO = new Level(20000, "INFO", 6);

public static final Level DEBUG = new Level(10000, "DEBUG", 7);

public static final Level TRACE = new Level(5000, "TRACE", 7);

}

像FATAL、ERROR這些級別，實際上對應一數字50000、40000

自定義log4j日誌級別