SimpleLog2File

UPDATE: Project is now a maven-project so you can build the jar yourself and add it to your project as lib.

This is just a simple file logger for your Java project. By default, it creates a logfile per day in the root folder of your project. In your logfile you will find lines like this:

2022-04-03 02:40:19.693 [TRACE] [Main.main()] Value of A: 2

Date/Time	Loglevel	Class and Methodname	Logmessage
2022-04-03 02:40:19.693	[TRACE]	[Main.main()]	Value of A: 2

Requirements

You can simply download the SimpleLog2File.jar and put it in your project libaries, and you are ready to use!

Usage

Use the default-constuctor and you are ready to use:

final SimpleLog2File logger = new SimpleLog2File();

Now you can use your logger e.g. in your main-Method of your Main-class:

logger.trace("Value of A: " + a);

This line of code produces a new line in your logfile like this:

2022-04-03 02:40:19.693 [TRACE] [Main.main()] Value of A: 2

You can give the method a simple logmessage that shows up in you log, but you can also put any type in the result. On that result, the toString()-Method is called before writing it into the logfile. Please be sure, that a toString()-Method is defined for your own objects!

Constructor

You can simply use the default constructor, and you are ready to use:

final SimpleLog2File logger = new SimpleLog2File();

There is another constructor that allows you to define your own logfolder and logfilename or just the logpath.

final SimpleLog2File logger = new SimpleLog2File("c:\\dev\\logs");

or

final SimpleLog2File logger = new SimpleLog2File("C:\\dev\\logs", "MySpecialLogfile.log");

Example:

Given is a Person.java which holds three fields: "surname", "name", "age". Simply override the toString()-Method:

@Override
public String toString() {
  return "Person=[surname=" + this.surname + ", name=" + this.name + ", age=" + this.age" + "]";
}

Now you are able to log a message for these objects:

final Person person = new Person("Magic", "Marcy", "42");
logger.trace(person);

This will produce the following line in your logfile:

2022-04-03 02:40:19.693 [TRACE] [Main.main()] Person=[surname=Magic, name=Marcy, age=42]

You are also able to concat your own infos to such an object:

final Person person = new Person("Magic", "Marcy", "42");
logger.trace("MyPersonObject is: " + person);

That will produce:

2022-04-03 02:40:19.693 [TRACE] [Main.main()] MyPersonObject is: Person=[surname=Magic, name=Marcy, age=42]

LogLevel

You can choose between different LogLevels, but it is only to show that in the line of your logfile.
There is no option to log just one specific level!

logger.trace();
logger.traceEntry();
logger.traceExit();
logger.debug(;
logger.info();
logger.error();
logger.warn();
logger.sql();

Error handling

If there is a problem with your specified logfile or -folder, an IOException is thrown. The exceptions stacktrace is shown in your console - not in your logfile!