in the development process, we often encounter the situation of reading the configuration file, for the configuration file read, depending on the environment and so on, and so on, in general, if the use of relative/path from a non-jar package, relatively simple, it is not a statement, and in many
case, we need to pack our class into a jar file for use, and then we'll find out that if we hadn't taken that into account before, it might not work, so how do we fix it? Methods are as follows
:
there are the following paths:
web-info--|-->classes--->jdbc.properties
|-->lib
this time addinto what we need to readjdbc.properties, it is a method to read in the following way when the jar package is not used:
file F = new file (This.getclass (). GetResource ("/"). GetPath ());
f = new File (F.getpath () + "/jdbc.properties");
Note: F.getpath () is the absolute path where class is located. such as: C:\javasrc\web-inf\classes
then, the file object is processed, the configuration information can be read out, but joined as the class is packaged into a jar file, then, when the program is executed here, will not find the configuration file, then how to deal with it?
The processing method is as follows:
Properties Properties=new properties ();
InputStream is = current class name. Class.getclassloader (). getResourceAsStream ("jdbc.properties");
Properties.load (IS);
String Driver = Properties.getproperty ("Jdbc.driverclassname");
Read the file inside the jar while running the jar package
