使用 java.util.logging 的 SimpleFormatter 和 XMLFormatter 在 Java 中生成日誌的最簡單方法
已發表: 2020-05-26
Java 帶有許多實用程序。 在本教程中,我們將介紹使用SimpleFormatter
和XMLFormatter
生成日誌文件的最簡單方法。
在 Crunchify 上,我們已經發布了一些關於一段時間前的日誌記錄的教程。
- 以正確的方式配置 log4j.properties
- 準備在您的生產項目中使用 Log4j 實用程序
- 創建您自己的日誌記錄級別
今天,我正在我的主機上設置Elastic FileBeats
,並希望生成可以由 Elastic FileBeats 在運行時獲取的日誌。
我已經快速創建了日誌生成實用程序,並希望與大家分享。 我們將使用 java 的內置java.util.logging
實用程序。
CrunchifyLogGenerator.java
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package crunchify . com . tutorial ; import java . io . IOException ; import java . util . logging . FileHandler ; import java . util . logging . Logger ; import java . util . logging . SimpleFormatter ; import java . util . logging . XMLFormatter ; /** * @author Crunchify.com * Version: 1.0 * Simplest way to generate logs files using SimpleFormatter and XMLFormatter */ public class CrunchifyLogGenerator { public static void main ( String [ ] args ) { // A Logger object is used to log messages for a specific system or application // component. Loggers are normally named, using a hierarchical dot-separated // namespace. Logger names can be arbitrary strings, but they should normally be // based on the package name or class name of the logged component, such as // java.net or javax.swing. In addition it is possible to create "anonymous" // Loggers that are not stored in the Logger namespace. Logger crunchifyLogger = Logger . getLogger ( "crunchifyLog" ) ; // Simple file logging Handler. FileHandler crunchifyFileHandler ; try { // We are setting handler to true = append data to file crunchifyFileHandler = new FileHandler ( "/Users/ashah/crunchify/crunchify-log.log" , true ) ; crunchifyLogger . addHandler ( crunchifyFileHandler ) ; // Print a brief summary of the LogRecord in a human readable format. SimpleFormatter formatter = new SimpleFormatter ( ) ; crunchifyFileHandler . setFormatter ( formatter ) ; // Format a LogRecord into a standard XML format. Uncomment below 2 lines to see XML result. // XMLFormatter formatter2 = new XMLFormatter(); // crunchifyFileHandler.setFormatter(formatter2); int n = 1 ; // infinite loop while ( true ) { // Log an INFO message. crunchifyLogger . info ( "Adding Crunchify Log line: " + n ) ; Thread . sleep ( 1000 ) ; n ++ ; } } catch ( SecurityException e ) { e . printStackTrace ( ) ; } catch ( IOException e ) { e . printStackTrace ( ) ; } catch ( InterruptedException e ) { e . printStackTrace ( ) ; } } } |
正如您在上面的程序中看到的,我below 2 lines
註釋掉了。 運行上面的程序後,取消下面兩行的註釋,您將看到 XML 結果輸出。
1 2 |
// XMLFormatter formatter2 = new XMLFormatter(); // crunchifyFileHandler.setFormatter(formatter2); |
只需將上述程序作為 Java 應用程序運行,您將看到以下行添加到您指定的日誌文件中。
Eclipse 控制台輸出:
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Jan 27 , 2019 7 : 04 : 11 PM crunchify . com . tutorial . CrunchifyLogGenerator main INFO : Adding Crunchify Log line : 3 Jan 27 , 2019 7 : 04 : 12 PM crunchify . com . tutorial . CrunchifyLogGenerator main INFO : Adding Crunchify Log line : 4 Jan 27 , 2019 7 : 04 : 13 PM crunchify . com . tutorial . CrunchifyLogGenerator main INFO : Adding Crunchify Log line : 5 Jan 27 , 2019 7 : 04 : 14 PM crunchify . com . tutorial . CrunchifyLogGenerator main INFO : Adding Crunchify Log line : 6 <? xml version = "1.0" encoding = "UTF-8" standalone = "no" ?> < ! DOCTYPE log SYSTEM "logger.dtd" > < log > < record > < date > 2019 - 01 - 27T19 : 07 : 37 < / date > < millis > 1548637657211 < / millis > < sequence > 0 < / sequence > < logger > crunchifyLog < / logger > < level > INFO < / level > < class > crunchify . com . tutorial . CrunchifyLogGenerator < / class > < method > main < / method > < thread > 1 < / thread > < message > Adding Crunchify Log line : 1 < / message > < / record > < record > < date > 2019 - 01 - 27T19 : 07 : 38 < / date > < millis > 1548637658233 < / millis > < sequence > 1 < / sequence > < logger > crunchifyLog < / logger > < level > INFO < / level > < class > crunchify . com . tutorial . CrunchifyLogGenerator < / class > < method > main < / method > < thread > 1 < / thread > < message > Adding Crunchify Log line : 2 < / message > < / record > < record > < date > 2019 - 01 - 27T19 : 07 : 39 < / date > < millis > 1548637659236 < / millis > < sequence > 2 < / sequence > < logger > crunchifyLog < / logger > < level > INFO < / level > < class > crunchify . com . tutorial . CrunchifyLogGenerator < / class > < method > main < / method > < thread > 1 < / thread > < message > Adding Crunchify Log line : 3 < / message > < / record > < record > < date > 2019 - 01 - 27T19 : 07 : 40 < / date > < millis > 1548637660244 < / millis > < sequence > 3 < / sequence > < logger > crunchifyLog < / logger > < level > INFO < / level > < class > crunchify . com . tutorial . CrunchifyLogGenerator < / class > < method > main < / method > < thread > 1 < / thread > < message > Adding Crunchify Log line : 4 < / message > < / record > |
我希望你發現這個工具對你的項目有幫助。 如果您在運行此程序時遇到任何問題,請告訴我。
