java和class文件的转换和防转换

一个普通的java文件，编译后成为class文件一个class文件或jar怎么得到java文件呢？JD-GUI is a standalone graphical utility that displays Java source codes of".class" files. You can browse the reconstructed source code with the JD-GUI

qiaozhangchi

307人浏览 · 2020-06-04 19:24:59

qiaozhangchi · 2020-06-04 19:24:59 发布

一个普通的java文件，编译后成为class文件

一个class文件或jar怎么得到java文件呢？

JD-GUI is a standalone graphical utility that displays Java source codes of
".class" files. You can browse the reconstructed source code with the JD-GUI
for instant access to methods and fields.

https://github.com/java-decompiler/jd-gui

> git clone https://github.com/java-decompiler/jd-gui.git
> cd jd-gui
> ./gradlew build

linux平台生成可执行文件在build/distributions/jd-gui-1.6.6.deb

安装后就可以使用了。

如何防止class的翻译呢？

https://github.com/core-lib/xjar

这个有springboot工程的插件，修改pom.xml文件

<!-- 设置 jitpack.io 仓库 -->
	<repositories>
		<repository>
			<id>jitpack.io</id>
			<url>https://www.jitpack.io</url>
		</repository>
	</repositories>
	<!-- 设置 jitpack.io 插件仓库 -->
	<pluginRepositories>
		<pluginRepository>
			<id>jitpack.io</id>
			<url>https://jitpack.io</url>
		</pluginRepository>
	</pluginRepositories>
<!-- 设置 依赖 -->
<dependency>
			<groupId>com.github.core-lib</groupId>
			<artifactId>xjar</artifactId>
			<version>4.0.1</version>
		</dependency>

<!-- 添加 XJar Maven 插件 用于加密 -->
			<plugin>
				<groupId>com.github.core-lib</groupId>
				<artifactId>xjar-maven-plugin</artifactId>
				<version>4.0.1</version>
				<executions>
					<execution>
						<goals>
							<goal>build</goal>
						</goals>
						<phase>package</phase>
						<!-- 或使用
                        <phase>install</phase>
                        -->
						<configuration>
							<password>io.xjar</password>
							<!-- optional
                            <algorithm/>
                            <keySize/>
                            <ivSize/>
                            <includes>
                                <include/>
                            </includes>
                            <excludes>
                                <exclude/>
                            </excludes>
                            <sourceDir/>
                            <sourceJar/>
                            <targetDir/>
                            <targetJar/>
                            -->
						</configuration>
					</execution>
				</executions>
			</plugin>

这样就可package时自动编译出jar和xjar

xjar就是加密过的，用go build target/xjar.go 就可编译出xjar引导文件

xjar java -jar XXX.xjar运行即可自己用jar，发布出去xjar就保证了某种程度的保密

go是跨平台，下面是linux下的安装：

https://golang.google.cn/dl/
tar -C /usr/local -xzf go1.14.4.linux-amd64.tar.gz
$HOME/.profile:
export PATH=$PATH:/usr/local/go/bin
source $HOME/.profile.
go version