How to package Java

How to package java

1. Manually create a directly executable jar package

1) First use javac to compile the java file and get the class file

2) Create a new file with any name, for example, it can be called manifest, and the content is as follows

Manifest-Version: 1.0 Main-Class: addJarPkg

(Note: 1 . Add a space after the colon, 2. Finally, you must press Enter to a new blank line, otherwise an error will occur. For example, as shown below, you must enter another Enter after addJarPkg)

3) Put the compiled class file Put the newly created file in step 2 into the specified folder, such astest

4) Run the command

jar -cvfm main.jar manifest -C test .

in cmd. Pay attention to the path problem, where

The "." after test represents all files

The -m option after jar will merge the files created in step 2 into META-INF/MANIFEST.MF in the jar package, which is to update the manifest configuration document. -C specifies the directory to be packaged, and the . after the directory represents all the files in the directory

2. Use the intellij idea tool to create a directly executable jar package

1 ) Click on Project

2) Click on the "File" menu in the upper left corner of intellij idea -> Project Structure

3) Click on "Artifacts" -> Green " " -> "JAR " -> Empty

4) Fill in the custom name in the Name column, select the jar package target directory in Output dictory, and double-click the file that needs to be added to the jar package in Available Elements to add it to the jar package on the left directory, see the picture below for details

5) Click Create Manifest and select the file path where MANIFEST.MF is placed (just default to the project root directory. Try not to choose other paths, which may cause unnecessary error), click OK.

6) Click the selection button behind Main Class

7) In the pop-up box, select the program entry main function that needs to be run, and click OK

8) After the above settings are completed , click OK

9) Click "Build" in the menu -> "Build Artifacts"

10) Double-click the build under the jar package to be generated in the pop-up box, as shown below

At this point, use Intellij idea to generate a jar package that can be directly executed.

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