JAR文件如何自行删除？ [英] How Can a JAR File Delete Itself?

问题描述

我需要一个JAR文件来删除它自己。

I need a JAR file to delete itself.

问题是Windows在JAR文件运行时锁定它，并且无法直接删除它。

The issue is that Windows locks the JAR file while it is running, and can't delete itself directly.

我已经研究过批处理脚本可以杀死JAR进程然后删除文件的解决方案，但是

I have looked into solutions where a batch script could kill the JAR process and then delete the file, but

• System.exit（0）是不可取的，因为它不能通过 Batch 文件运行。


• taskkill / F / IMjava.exe不合适，因为它会杀死所有 Java 进程。


• jps 无法使用因为它仅在 JDK 中可用，用户可能会运行a JRE 因此会失败。

• System.exit(0) is not desired because it is not runnable via Batch file.
• taskkill /F /IM "java.exe" is not desired because it kills ALL Java processes.
• jps cannot be used because it is only available in the JDK and users might run a JRE so that would fail.

我一直在寻找一个解决方案，让我找到当前 JAR 的 PID Java 代码，然后写出来批量命令并插入 PID ，这会终止进程，例如如下所示：

I'm stuck on looking for a solution which lets me find the PID of the current JAR using Java code, then writing out a Batch command and inserting the PID which kills the process e.g. like the following:

printWriter.println("taskkill /PID " + currentJARPID);

如果你想知道这是为了什么，你可以检查这个答案。

If you're wondering what this is for, you can check this answer.

推荐答案

这是一个工作示例

public class Delete
{
    public static void main(String[] args) throws Throwable
    {
        System.out.println("Running");

        System.out.println("Deleting");
        Runtime.getRuntime().exec("cmd /c ping localhost -n 6 > nul && del Delete.jar");

        System.out.println("Ending");
        System.exit(0);
    }
}

支持此功能的主要功能是 cmd / c ping localhost -n 6> nul&& del Delete.jar

The main feature powering this is cmd /c ping localhost -n 6 > nul && del Delete.jar

在等待5秒

为了测试，我使用了 javac Delete.java&& jar cfe Delete.jar删除Delete.class 构建jar，然后 java -jar Delete.jar 运行

To test, I used javac Delete.java && jar cfe Delete.jar Delete Delete.class to build the jar, and java -jar Delete.jar to run

我还验证了我无法在执行时删除jar文件，通过 new File（Delete.jar）。delete（）; 并且还使用Windows资源管理器

I also verified that I could not delete the jar file while it was executing, through new File("Delete.jar").delete(); and also using Windows Explorer

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