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【Java用法】windows10系统下修改jar中的文件并重新打包成jar文件然后运行

一、背景描述测试环境（Linux）的代码（jar包）拉取到本地电脑（Windows10），然后连接本地电脑上的数据库并在本地电脑运行。前提：Windows10电脑，jar包文件，本地电脑已安装好MySQL数据库。需求：需要将下面jar包中配置文...

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【密码学】Java课设-文件加密系统（适用于任何文件）

Java实现文件加密解密前言一、密码学入门1.对称加密2.非对称加密二、程序代码1.welcome类（欢迎界面）2.Log类（登录界面）3.Register类（注册界面）4.Index类（首页界面）5.MajorFR类（加/解密文件操作界面）6.FileAc...

java.io.IOException: Cannot run program “del“: CreateProcess error=2, 系统找不到指定的文件。

具体错误java.io.IOException: Cannot run program "del": CreateProcess error=2, 系统找不到指定的文件。 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048) at j...

[帮助文档] 删除缓存文件导致Java构建缓慢

问题说明由于 Flow 流水线执行时，每个任务节点都会创建新的构建环境，构建完后会销毁，为解决流水线运行过程中，构建依赖反复下载的问题，提升整体构建效率，Flow 提供了自定义缓存功能。用户可以自定义自己的缓存目录，实现流水线任务多次运行的缓存共享当您在构建指令中使用rm -rf删除了部分缓存文件，...

[帮助文档] Dataphin中Shell运行JAR文件报错bash:java:commandnotfound

问题描述Dataphin中Shell运行Jar文件报错“bash: java: command not found”。问题原因1.代码打成Jar包的时候，需要Jar包名称和main方法所在类名称保持一致；上传资源文件的时候，名称需要和Jar文件名称保持一致：2.需要注意java -jar命令是在Sh...

请教一下JAVA开发的WEB系统，JAVA 文件改动后，是否需要重新启动WEB服务器：报错

我想用JAVA开发一套WEB系统，使用TOMCAT作为WEB服务器。假如我改动某些JAVA CLASS文件后，重新部署到WEB 服务器后，是否需要重启TOMCAT呢？因为重启TOMCAT会带来短暂的系统停机时间，对于某些关键的系统来说，损失是比较大的。网上有一些不要重启的办法，但是会有一些问...

打扰大家一下，请教一个技术问题，就是我这边做java线上代码热更新的功能，自定义classloader ，系统启动的时候会把所有的类都加载，然后我这变在程序运行期间修改某个类，然后通过自定义的classloader 去重加加载这个修改的类，自定义的classloader ，重新覆写了Class findClass(String name) throws ClassNotFoundException 发放，然后就是每次调用这个方法的时候，都是从新读写最新的.class 文件字节流，但是重新加载还是

本问题及下方已被采纳的回答均来自云栖社区【阿里Java技术进阶2群】。https://yq.aliyun.com/articles/690084 点击链接欢迎加入社区大社群。

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