Java實現Excel檔案轉PDF(無水印無限制)

2022-06-08 22:00:48

前言

java處理excel轉pdf一直沒找到什麼好用的免費jar包工具，自己手寫的難度，恐怕高階程式設計師花費一年的事件，也不能做出來非常好用，再說誰會不賺錢，花費一年事件去研究java如何實現excel轉pdf的，於是我找到了Aspose公司出的aspose-cells的java的jar包來實現。之前寫過一篇技術文章，不過後來覺得實現起來有些繁瑣，因為aspose-cells沒有商業授權，轉換出來的pdf都會帶文字和圖片水印，且轉換pdf的頁數也會被受限制，之前的邏輯是自己用aspose-cells轉換pdf後，又用apache-pdfbox去實現pdf的水印去除。這樣不僅浪費了效能，還加長了處理時間。於是這個版想從aspose-cells入手，破除商業版的限制。教學如下。

一、jar破解

1.專案遠端倉庫設定

aspose-cells 這個需要設定單獨的倉庫地址才能下載，不會設定的可以去官網直接下載jar引入專案程式碼中。

<repositories>
        <repository>
            <id>AsposeJavaAPI</id>
            <name>Aspose Java API</name>
            <url>https://repository.aspose.com/repo/</url>
        </repository>
    </repositories>

2.pom檔案引入相關依賴

        <!-- https://mvnrepository.com/artifact/com.aspose/aspose-cells -->
        <dependency>
            <groupId>com.aspose</groupId>
            <artifactId>aspose-cells</artifactId>
            <version>21.8</version>
        </dependency>
       <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.20.0-GA</version>
        </dependency>

Javassist是一個開源的分析、編輯和建立Java位元組碼的類庫。

3.程式碼破解

import javassist.*;
 
import java.io.*;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
 
public class ExcelJarCrack {
    public static void main(String[] args) throws Exception {
        String jarPath = "C:\Users\liuya\Desktop\jar\aspose-cells-21.8.jar";
        crack(jarPath);
    }
 
    private static void crack(String jarName) throws NotFoundException, CannotCompileException, IOException {
        //這一步是完整的jar包路徑
        ClassPool.getDefault().insertClassPath(jarName);
        CtClass LicenseClass = ClassPool.getDefault().getCtClass("com.aspose.cells.License");
        CtMethod[] aMethods = LicenseClass.getDeclaredMethods("a");
        for (CtMethod aMethod : aMethods) {
            CtClass returnType=aMethod.getReturnType();
            if(returnType.getName().equals("boolean")){
                aMethod.setBody("{return true;}");
                break;
            }
        }
        //將檔名命名成備份檔案
       File file=new File(jarName);
       LicenseClass.writeFile(file.getParent());
       disposeJar(jarName);
    }
 
    private static void disposeJar(String jarName) {
        List<String> deletes = new ArrayList<>();
        deletes.add("META-INF/37E3C32D.SF");
        deletes.add("META-INF/37E3C32D.RSA");
        List<String> replaces = new ArrayList<>();
        replaces.add("com/aspose/cells/License.class");
        File oriFile = new File(jarName);
        if (!oriFile.exists()) {
            System.out.println("######Not Find File:" + jarName);
            return;
        }
        //將檔名命名成備份檔案
        String bakJarName = jarName.substring(0, jarName.length() - 3) + "cracked.jar";
        try {
            //建立檔案（根據備份檔案並刪除部分）
            JarFile jarFile = new JarFile(jarName);
            JarOutputStream jos = new JarOutputStream(new FileOutputStream(bakJarName));
            Enumeration entries = jarFile.entries();
            while (entries.hasMoreElements()) {
                JarEntry entry = (JarEntry) entries.nextElement();
                if (!deletes.contains(entry.getName())) {
                    if(replaces.contains(entry.getName())){
                        System.out.println("Replace:-------" +entry.getName());
                        JarEntry jarEntry = new JarEntry(entry.getName());
                        jos.putNextEntry(jarEntry);
                        FileInputStream fin = new FileInputStream(oriFile.getParent()+ "/"+entry.getName());
                        byte[] bytes = readStream(fin);
                        jos.write(bytes, 0, bytes.length);
                    }else {
                        jos.putNextEntry(entry);
                        byte[] bytes = readStream(jarFile.getInputStream(entry));
                        jos.write(bytes, 0, bytes.length);
                    }
                } else {
                    System.out.println("Delete:-------" + entry.getName());
                }
            }
            jos.flush();
            jos.close();
            jarFile.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
 
    private static byte[] readStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while ((len = inStream.read(buffer)) != -1) {
            outSteam.write(buffer, 0, len);
        }
        outSteam.close();
        inStream.close();
        return outSteam.toByteArray();
    }
 
}

修改為你本機的aspose-cells-21.8.jar路徑，然後執行主方法，破解成功後，會再同級資料夾下生成一個aspose-cells-21.8.cracked.jar包，用這個包替換原來的aspose-pdf-21.8.jar包即可。

二、Excel轉PDF

1.程式碼實現

import com.aspose.cells.License;
import com.aspose.cells.SaveFormat;
import com.aspose.cells.Workbook;
 
import java.io.FileOutputStream;
 
public class PdfUtils {
 
    public static void main(String[] args) {
        excelToPdf("C:\Users\liuya\Desktop\excel\test.xlsx");
    }
 
    /**
     * Excel檔案轉換
     * @param excelPath 需要被轉換的excel全路徑帶檔名
     * @Return void
     */
    public static void excelToPdf(String excelPath) {
        License license = new License();
        license.setLicense("C:\Users\liuya\Desktop\jar\Aspose.License.xml");
        long old = System.currentTimeMillis();
        try {
            //新建一個pdf檔案
            String pdfPath=excelPath.substring(0,excelPath.lastIndexOf("."))+".pdf";
            //Excel檔案資料
            Workbook wb = new Workbook(excelPath);
            FileOutputStream fileOS = new FileOutputStream(pdfPath);
            //儲存為pdf檔案
            wb.save(fileOS, SaveFormat.PDF);
            fileOS.close();
            //轉化用時
            long now = System.currentTimeMillis();
            System.out.println("EXCEL 轉 Pdf 共耗時：" + ((now - old) / 1000.0) + "秒");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
}

2.Aspose.License.xml 授權檔案

程式碼如下：

<License>
    <Data>
        <LicensedTo>Aspose Scotland Team</LicensedTo>
        <EmailTo>billy.lundie@aspose.com</EmailTo>
        <LicenseType>Developer OEM</LicenseType>
        <LicenseNote>Limited to 1 developer, unlimited physical locations</LicenseNote>
        <OrderID>140408052324</OrderID>
        <UserID>94236</UserID>
        <OEM>This is a redistributable license</OEM>
        <Products>
            <Product>Aspose.Total for Java</Product>
        </Products>
        <EditionType>Enterprise</EditionType>
        <SerialNumber>9a59547c-41f0-428b-ba72-7c4368f151d7</SerialNumber>
        <SubscriptionExpiry>20221231</SubscriptionExpiry>
        <LicenseVersion>3.0</LicenseVersion>
        <LicenseInstructions>http://www.aspose.com/corporate/purchase/license-instructions.aspx</LicenseInstructions>
    </Data>
    <Signature>FO3PHsblgDt8F59sMT1l1amyi9qk2V6E8dQkIP7LdTJSxDibNEFu1zOinQbqFfKv/ruttvcxoROkc1tUe0DtO6cP1Zf6J0VemgSY8i/LZECTGszRqJVQRZ0MoVnBhuPAJk5eli7fhVcF8hWd3E4XQ3LzfmJCuaj2NEteRi5Hrfg=</Signature>
</License>

因為jar已破解其核心驗證方法，裡面的簽名可以隨便填寫，但是格式儘量保持一致，因為驗證其他的格式方法還在！

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