转载

java混淆了吗

前言

最近在项目中碰到个一个场景，我们需要把自己的java项目jar包部署到一个第三方的服务器上，虽然双方互相信任，但是综合考虑，避免别人拿到jar包后可以很快的编译出源码，我们决定给代码加一层混淆，虽然此方法不能从根源上解决问题，但是做了一层混淆，也可以增加阅读源码的难度，总结了一下，写下这篇文章。

如何反编译java代码

我用的是mac电脑，从官网: http://java-decompiler.github... 下载JD-GUI，官网有很多版本，下载后安装打开即可，导入你想反编译的jar，我这里随便找了个jar包做演示

java混淆了吗

何为java混淆

细心的小伙伴肯定发现了，上面的截图有的包名是a，b，c这样命名的，但凡有点节操的程序员都不会这样命名的，这就是被混淆后的代码，让人不会一眼看出来代码里面的逻辑，效果会像下面这样

java混淆了吗

可以看到类名，包名都被修改了

进行java混淆

我们以之前springboot项目为例，进行service层的代码的混淆，混淆前效果如下：

java混淆了吗

接下来我们只需要在pom里面加入如下插件

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.github.wvengen</groupId>
                <artifactId>proguard-maven-plugin</artifactId>
                <version>2.0.14</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>proguard</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <proguardVersion>6.1.0beta2</proguardVersion>
                    <injar>${project.build.finalName}.jar</injar>
                    <outjar>${project.build.finalName}.jar</outjar>
                    <obfuscate>true</obfuscate>
                    <options>
                        <option>-dontshrink</option>
                        <option>-dontoptimize</option>
                        <!-- This option will replace all strings in reflections method invocations with new class names.
                             For example, invokes Class.forName('className')-->
                        <option>-adaptclassstrings</option>
                        <option>-keepdirectories</option>
                        <!-- This option will save all original annotations and etc. Otherwise all we be removed from files.-->
                        <option>-keepattributes
                            Exceptions,
                            InnerClasses,
                            Signature,
                            Deprecated,
                            SourceFile,
                            LineNumberTable,
                            *Annotation*,
                            EnclosingMethod
                        </option>
                        <!-- This option will save all original names in interfaces (without obfuscate).-->
                        <option>-keepnames interface **</option>
                        <!-- This option will save all original methods parameters in files defined in -keep sections,
                             otherwise all parameter names will be obfuscate.-->
                        <option>-keepparameternames</option>
                        <!--不使用大小写字母进行混淆，保持类唯一性-->
                        <option>-dontusemixedcaseclassnames</option>
                        <!-- This option will save all original class files (without obfuscate) but obfuscate all
                             in domain and service packages.-->
                        <option>-keep
                            class com.stone.zplxjj.Application {
                            public static void main(java.lang.String[]);
                            }
                        </option>
                        <!-- 指明哪些类可以不被混淆-->
                        <option>-keep class com.stone.zplxjj.autoconfiguration.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.config.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.controller.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.dao.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.entity.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.event.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.interceptor.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.listener.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.properties.** { *; }</option>
                        <option>-keep class com.stone.zplxjj.filter.** { *; }</option>
                        <!-- This option ignore warnings such as duplicate class definitions and classes in incorrectly
                            named files-->
                        <option>-ignorewarnings</option>
                        <!-- This option will save all original class files (without obfuscate) in service package-->
                        <!--<option>-keep class com.slm.proguard.example.spring.boot.service { *; }</option>-->
                        <!-- This option will save all original interfaces files (without obfuscate) in all packages.-->
                        <option>-keep interface * extends * { *; }</option>
                        <!-- This option will save all original defined annotations in all class in all packages.-->
                        <option>-keepclassmembers class * {
                            @org.springframework.beans.factory.annotation.Autowired *;
                            @org.springframework.beans.factory.annotation.Value *;
                            }
                        </option>
                    </options>
                    <injarNotExistsSkip>true</injarNotExistsSkip>
                    <libs>
                        <!--Put here your libraries if required-->
                        <lib>${java.home}/lib/rt.jar</lib>
                    </libs>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>net.sf.proguard</groupId>
                        <artifactId>proguard-base</artifactId>
                        <version>6.1.0beta2</version>
                    </dependency>
                </dependencies>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

执行打包命令：mvn package，会看到生成如下

java混淆了吗