Log4j provides multiple options to format log files created by the framework. It can create simple log files, xml log files or html log files also.
If you want to create your logging information in an HTML formatted file, then you have to use the org.apache.HTMLLayout class to format your logging information.
/.Add an appender to Log4j which sends all INFO+ messages to a separate file. which will be used later to scan for suspect strings. The pattern of the. messages conforms to the original log format so that hydra will be able. to parse them./ private static void addSuspectFileAppender(final String workspaceDir) final String suspectFilename = new File(workspaceDir, SUSPECTFILENAME. It logs events to a number of rotating log files of a fixed size. And now you can use the appender in your log4j config file like shown in the config examples above. Log4j provides multiple options to format log files created by the framework. It can create simple log files, xml log files or html log files also. If you want to create your logging information in an HTML formatted file, then you have to use the org.apache.HTMLLayout class to format your logging information. There are many ways to log: it can be saved to a file, console (or command prompt), a database, or elsewhere for review. Appender is an object which responsible to display log messages. Two commonly used appenders: ConsoleAppender: to display log messages to the console or command prompt. Hi all we configure the HIVE, and log4j with RollingFileAppender log4j.appender.DRFA=org.apache.log4j.RollingFileAppender log4j.appender.DRFA.MaxBackupIndex=10 log4j.appender.DRFA.MaxFileSize=1KB full details: # Define some default values that can be overridden by system properties hive.log.thresho.
The HTMLLayout class extends the abstract class, i.e., org.apache.log4j.Layout class and overrides the format() method from its base class to provide HTML style formatting.
HTMLLayout displays the following information: Learn to fly 2 gaming potatoes without.
- The time elapsed from the start of the application before a particular logging event was generated.
- The thread name that invoked the logging request.
- Level associated with this logging request.
- Name of the logger and logging message.
- The location information (optional) for the program file and the line number from which this logging was invoked.
HTMLLayout is a very simple object of Layout that provides the following methods:
| S. No. | Method | Description |
|---|---|---|
| 1. | setContentType(String) | This method is used to set the content type of the text/html HTML content. Default is text/html. |
| 2. | setLocationInfo(String) | This method is used to set the location information for the logging event. Default is false. |
| 3. | setTitle(String) | This method is used to set the title for the HTML file. Default is log4j Log Messages. |
HTMLLayoutExample
Following is the simple configuration file for HTMLLayout:
Log4j.properties:
Following is the Java file which would generate logging information:
HtmlLayoutEx.java
Compile then run the above code. It would create an htmlLayout.html file in C:/usr/home/log4j directory which would have the following log information:
htmlLayout.html
You can use any web browser to open htmlLayout.html file. You can note that the footer for the </html> and </body> tags is completely missing.
One of the biggest advantages of having the log file in HTML format is that it can be published as a web page for remote viewing.
Let's see a simple example for log4j. Follow the below steps:
1) Create a Java Project
- Open the MyEclipse and go to File->New-> Java Project
- Enter the name of the project and click on the Finish button.
2) Add the log4j jar File
- To add the jar file of log4j, right-click on the created java project name and select Build Path -> Configure Build Path.
- Go to the Libraries tab and then click on the Add External JARs button.
- Select the log4j-1.2.17.jar file and click on OK button.
3) Create a Java File
- Create a new file on your java project and put the name of that file. Here my file name is Example.java.
- Copy the following code in your java file.
4) Create a log4j.properties File
Now, we need one configuration file i.e. log4j.properties file. For this, follow the given steps:
- Right-click on your project name and go to New-> Folder
- Create a new file on that folder.
- Set the file name log4j.properties and click on Finish button.
- Go to the source tab from the bottom of the log.properties file and copy the following code.
5) Add the log4j.properties file to the Classpath
Now, we need to add the location of our log4j.properties file to the Classpath in Eclipse. Follow the below steps to do the configuration:
- Right-click on your project name and select Run As -> Run Configurations
- Go to the Classpath tab and click on Advanced button.
- Select the Add Folders option and click on OK button.
- Browse the folder which you have created for log4j.properties file. Here, my folder name is Properties. Select that folder and click on OK, Apply then Run button.
6) Compile and Run the Project
When you run the project you would get the output inside C:/usr/home/log4j/log.out file.
Output on the Console:
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You can also see the output on the console. For this, you have to change the log4j.properties file. Copy the following code in your log4j.properties file:
Now, when you compile and run the project, you will get the same output on the console:
Output: Scary maze gamewatermelon gaming headset.
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