How to package a Java program into a jar file package and execute it

This article mainly introduces the method of packaging Java programs into jar file packages and executing them. It is of great practical value. Friends in need can refer to it.

This article introduces the method of packaging Java programs into jar file packages. The method of execution is shared with everyone, as follows:

1. First, confirm whether the program you wrote has any errors.

2. The first time I wrote a Web Project, I have not been able to execute it successfully until now, so the best thing to create is a java Project

Packaging steps:

1 .Right-click on the project and select Export.

2. Enter the interface below and select the JAR file under Java

3. Select the project and confirm Check whether the necessary files are selected and select the path to save the jar file package, as shown below

4. After completing step 3, click Next to enter the interface as shown below:

5. Click Next directly to enter the following interface:

6. Click Finish directly, and the jar file package is completed.

Remarks:

1. You can choose some conditions according to your own needs.
2. Open the META-INF\MANIFEST.MF file under the jar file package and check whether the information is correct.

Class-Path: This imports some other jar file packages needed for this project

Main-Class: This is the main() method The path to the .class file of the class where it is located, and there is a carriage return character at the end (for example: as shown above, the main() method is in the PostgresSQLSync class under the test package.)

Run under windows jar package, confirm whether there is a problem with the exported jar package:

1. Open the DOS command: switch to the project path via cd, and then enter java -jar xxx.jar.

If the entered information is the same as the information output on the console when running the project, it means that the jar file package has been completed.

The following are some problems I encountered:

1. In the DOS command, when the following error occurs, it means that Main-Class is not configured in the file META-INF\MANIFEST.MF .

#2. In the DOS command, when the following error occurs, it means that there is no space after Class-Path: or Main-Class:.

Note: Of course, this is just a problem I encountered. If there are any errors in the document written above, please point it out. Or if you have other problems during the operation, you can also communicate with me. (thank you all!)

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