java：编写jar包加密工具，防止反编译

懒人方案

网盘：

链接：https://pan.baidu.com/s/1x4OB1IF2HZGgtLhd1Kr_AQ
提取码：glx7

网盘内是已生成可用工具，下载可以直接使用，使用前看一下READ.txt文件。

注意：此加密工具会把Class完全加密，jd-gui-1.4.0只能反编译出jar结构，但是看不到class文件源码！

Maven依赖

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zy.java</groupId>

    <artifactId>Util</artifactId>

    <version>1.0-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.6.RELEASE</version>

    </parent>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>com.github.core-lib</groupId>

            <artifactId>xjar</artifactId>

            <version>v1.1.4</version>

        </dependency>

        <dependency>

            <groupId>org.apache.commons</groupId>

            <artifactId>commons-compress</artifactId>

            <version>1.18</version>

        </dependency>

        <dependency>

            <groupId>com.github.core-lib</groupId>

            <artifactId>loadkit</artifactId>

            <version>v1.0.0</version>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <version>1.5.6.RELEASE</version>

                <configuration>

                    <fork>true</fork>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

java代码

package com.zy.java;

import io.xjar.XConstants;

import io.xjar.XKit;

import io.xjar.boot.XBoot;

import io.xjar.key.XKey;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.io.*;

import java.security.NoSuchAlgorithmException;

public class Practice{

    private static String password = "你的加密密码";

    private static JButton openItem, saveItem;

    private static FileDialog openDia, saveDia;// 定义“打开、保存”对话框

    private static String filePathOld;//旧文件路径

    private static String filePathNew;//新文件路径

    private static String fileName;//文件名

    static JFrame f = null;

    static JTextField locationText, typeText;

    public static void main(String[] args) {

        int gap = 5;

        f = new JFrame("加密程序");

        ImageIcon icon = new ImageIcon("src\\images\\2.ico");

        f.setIconImage(icon.getImage());// 给窗体设置图标方法

        f.setSize(550, 310);

        f.setLocation(200, 200);

        f.setLayout(null);

        JPanel pInput = new JPanel();

        pInput.setBounds(gap, gap, 520, 60);

        pInput.setLayout(new GridLayout(2, 3, gap, gap));

        JLabel location = new JLabel("JAR路径:");

        locationText = new JTextField(10);

        openItem = new JButton("选取");// 创建“打开"菜单项

        JLabel type = new JLabel("保存路径:");

        typeText = new JTextField(10);

        saveItem = new JButton("选取");// 创建“保存"菜单项

        openDia = new FileDialog(f, "打开", FileDialog.LOAD);

        saveDia = new FileDialog(f, "保存", FileDialog.SAVE);

        JButton b = new JButton("生成");

        pInput.add(location);

        pInput.add(locationText);

        pInput.add(openItem);

        pInput.add(type);

        pInput.add(typeText);

        pInput.add(saveItem);

        //文本域

        final JTextArea ta = new JTextArea();

        ta.setLineWrap(true);

        b.setBounds(220, 60 + 30, 80, 30);

        ta.setBounds(gap, 80 + 60, 523, 120);

        f.add(pInput);

        f.add(b);

        f.add(ta);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        f.setVisible(true);

        myEvent();

        //鼠标监听

        b.addActionListener(new ActionListener() {

            boolean checkedpass = true;

            public void actionPerformed(ActionEvent e) {

                XKey xKey = null;

                System.out.println(" --- : "+fileName);

                String newPath = filePathNew+"\\"+fileName+"-xjar.jar";

                String oldPath = filePathOld;

                try {

                    xKey = XKit.key(password);

                    XBoot.encrypt(oldPath, newPath, xKey, XConstants.MODE_DANGER);

                    ta.append(" Success! ");

                } catch (NoSuchAlgorithmException eg) {

                    eg.printStackTrace();

                } catch (Exception eg) {

                    eg.printStackTrace();

                }

                checkedpass = true;

                checkEmpty(locationText, "JAR路径");

                checkEmpty(typeText, "保存路径");

                if (checkedpass) {

                    String model = "加密jar包保存路径 ：%s";

                    String result = String.format(model, newPath);

                    ta.setText("");

                    ta.append(result);

                }

            }

            //检验是否为空

            private void checkEmpty(JTextField tf, String msg) {

                if (!checkedpass)

                    return;

                String value = tf.getText();

                if (value.length() == 0) {

                    JOptionPane.showMessageDialog(f, msg + " 不能为空");

                    tf.grabFocus();

                    checkedpass = false;

                }

            }

        });

    }

    //选取按钮监听

    private static void myEvent() {

        // 选取监听

        openItem.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                openDia.setVisible(true);//显示打开文件对话框

                String dirpath = openDia.getDirectory();//获取打开文件路径并保存到字符串中。

                String Name = openDia.getFile();//获取打开文件名称并保存到字符串中

                System.out.println(" --- : " + Name.split(".jar")[0]);

                fileName = Name.split(".jar")[0];

                filePathOld = dirpath+Name;

                if (dirpath == null || Name == null)//判断路径和文件是否为空

                    return;

                locationText.setText(dirpath+Name);

            }

        });

        // 选取监听

        saveItem.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                JFileChooser chooser = new JFileChooser();

                chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

                chooser.showDialog(new JLabel(), "选择");

                File file = chooser.getSelectedFile();

                if (file == null) {

                    System.out.println(" 路径 ："+file.getAbsoluteFile().toString());

                    typeText.setText(file.getAbsoluteFile().toString());

                    filePathNew = file.getAbsoluteFile().toString();

                }else{

                    System.out.println(" 路径 ："+file.getAbsoluteFile().toString());

                    typeText.setText(file.getAbsoluteFile().toString());

                    filePathNew = file.getAbsoluteFile().toString();

                }

            }

        });

        // 窗体关闭监听

        f.addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent e) {

                System.exit(0);

            }

        });

    }

}

代码先进行打包，Maven ——> clean ——> install

代码运行测试

选择jar文件，保存路径，点击生成即可。

下载exe生成器

exe4j : https://www.apponic.com/phome/download/95409-2-1593674778-a86aa6a3165855674c85c5a9dc7c8dbb/

下载安装完成后，界面如图，

第一步完成注册，Name,Company随便填就是了，注册码：A-XVK258563F-1p4lv7mg7sav （网上很多啊，随便搜一个就行）

点击 next ，勾选JAR in EXE

点击 next ,填写打包后的 exe程序名称和保存路径

点击 next ,设置程序方式，兼容系统64位

点击 next ,添加jar包，选择运行的主类的main方法

点击 next ,设置JDK运行版本

复制jre,放到jre的空文件夹下：D：/jre/jre

加载jre环境

一直点 next ,等待安装完成。

10.

尝试运行exe文件

　　成功！！

如果报错 java.lang.NoClassDefFoundError: BOOT-INF/classes/com/**/java/**** (wrong name: com/**/java/****) 返回第5步修改启动类进行尝试。