最简单的方法可能是升级或重新安装Java运行时环境(JRE)。

或:

Open the Windows Explorer, from the Tools select 'Folder Options...' Click the File Types tab, scroll down and select JAR File type. Press the Advanced button. In the Edit File Type dialog box, select open in Actions box and click Edit... Press the Browse button and navigate to the location the Java interpreter javaw.exe. In the Application used to perform action field, needs to display something similar to C:\Program Files\Java\j2re1.4.2_04\bin\javaw.exe" -jar "%1" % (Note: the part starting with 'javaw' must be exactly like that; the other part of the path name can vary depending on which version of Java you're using) then press the OK buttons until all the dialogs are closed.

这是从这里偷来的:http://windowstipoftheday.blogspot.com/2005/10/setting-jar-file-association.html

在Windows Vista或Windows 7中，手动文件关联编辑器已被删除。

最简单的方法是运行Jarfix，这是一个很小但功能强大的免费工具。只要运行它，你的Java应用程序就回来了…会了。

创建.bat文件:

start javaw -jar %*

然后选择app default，用这个。bat文件打开。jar。

当启动.jar文件时，它将关闭cmd。

在windows上运行.jar文件有很多方法。其中一个正在使用命令提示符。

步骤:

打开命令提示符(以管理员身份运行) 现在为根目录写入“cd\”命令 输入“java jar文件名。jar” 注意:你也可以使用任何第三方应用程序，如WinRAR, jarfix等。

最简单的方法可能是升级或重新安装Java运行时环境(JRE)。

或:

Open the Windows Explorer, from the Tools select 'Folder Options...' Click the File Types tab, scroll down and select JAR File type. Press the Advanced button. In the Edit File Type dialog box, select open in Actions box and click Edit... Press the Browse button and navigate to the location the Java interpreter javaw.exe. In the Application used to perform action field, needs to display something similar to C:\Program Files\Java\j2re1.4.2_04\bin\javaw.exe" -jar "%1" % (Note: the part starting with 'javaw' must be exactly like that; the other part of the path name can vary depending on which version of Java you're using) then press the OK buttons until all the dialogs are closed.

这是从这里偷来的:http://windowstipoftheday.blogspot.com/2005/10/setting-jar-file-association.html

如果需要通过双击jar文件来运行该jar文件，则必须将其创建为“Runnable jar”。你可以简单地用你的IDE来做。

如果您正在使用eclipse，请遵循以下步骤:

    To create a new runnable JAR file in the workbench:

1.From the menu bar's File menu, select Export.
2.Expand the Java node and select Runnable JAR file. Click Next.
3.In the  Opens the Runnable JAR export wizard Runnable JAR File Specification page, select a 'Java Application' launch configuration to use to create a runnable JAR.
4.In the Export destination field, either type or click Browse to select a location for the JAR file.
5.Select an appropriate library handling strategy.
Optionally, you can also create an ANT script to quickly regenerate a previously created runnable JAR file.

更多信息可以在Eclipse帮助页:LINK上找到