Idea packages jar packages and runs jar package commands

One 、 What is? jar package

jar package : The full name of the document Java Archive File,Java Archives ：

*** Used to package class files , Easy to transplant ;

*** File format and common ZIP Compressed files are similar , Common decompression software can be used to open ;

*** By default, the file contains a file named META-INF/MANIFEST.MF The list file for , Generated by the system JAR Files are created automatically .

Tips ：

jar The package is mainly for class Package files , and java Compile generated class Files are platform independent , That means jar Packages are cross platform , So you don't have to worry about specific platform issues .
 

Two 、 Why fight jar package

When we develop a program , There are many classes in the program , If you need to provide it to others , It's very bad to send a lot of source files to each other , Therefore, it is usually necessary to package these classes and related resource files into a jar package , Put this jar The bag is provided for others to use , At the same time, it provides users with a clear document interface . So that others get what we provide jar after , You can easily call .

3、 ... and 、IDEA How to pack jar Package and jar How packages work

Premise ：

  Create a folder in your project directory to store MANIFEST.MF file

Find and save idea Project code Folder >> Under the java>> Project name >>src Folder >>mian Folder >> New folder

for example ：E:\code\java\rz_cms\src\main\res

Be careful ： The path cannot be used IDEA Set the default path , You have to create... Manually .

1. Set packaging parameters

 

 2. export jar package

 

  When Progress bar After a walk , There will be one more... In the project directory out Folder , What is stored in it is to use IDEA Derived jar package

3、 function jar file

stay E:\code\java\rz_cms\out\artifacts\rz_cms_jar

Input cmd Use the command to run jar file

javaw -jar -Xmx1024m -Xms1024m rz_cms.jar > log.txt

Command parsing ：

javaw： Background operation

java： The front desk operation

Xmx： Set up Java Initialization size of stack

Xms： Set the largest java Heap size

> log.txt： Direct the log output to log.txt in

4、 The end of the process

Query the running process with the corresponding port number

netstat -ano | findstr 8070

  End correspondence PID The process of

taskkill -F -PID 592