Java实现Excel文件转PDF(无水印无限制)_Java教程

前言

java处理excel转pdf一直没找到什么好用的免费jar包工具，自己手写的难度，恐怕高级程序员花费一年的事件，也不能做出来非常好用，再说谁会不赚钱，花费一年事件去研究java如何实现excel转pdf的，于是我找到了Aspose公司出的aspose-cells的java的jar包来实现。之前写过一篇技术文章，不过后来觉得实现起来有些繁琐，因为aspose-cells没有商业授权，转换出来的pdf都会带文字和图片水印，且转换pdf的页数也会被受限制，之前的逻辑是自己用aspose-cells转换pdf后，又用apache-pdfbox去实现pdf的水印去除。这样不仅浪费了性能，还加长了处理时间。于是这个版想从aspose-cells入手，破除商业版的限制。教程如下。

一、jar破解

1.项目远程仓库配置

aspose-cells 这个需要配置单独的仓库地址才能下载，不会配置的可以去官网直接下载jar引入项目代码中。

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

2.pom文件引入相关依赖

        <!-- 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是一个开源的分析、编辑和创建Java字节码的类库。

3.代码破解

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 {
      //这一步是完整的jar包路径
      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;
          }
      }
      //将文件名命名成备份文件
     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;
      }
      //将文件名命名成备份文件
      String bakJarName = jarName.substring(0, jarName.length() - 3) + "cracked.jar";
      try {
          //创建文件（根据备份文件并删除部分）
          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();
  }

}

修改为你本机的aspose-cells-21.8.jar路径，然后运行主方法，破解成功后，会再同级文件夹下生成一个aspose-cells-21.8.cracked.jar包，用这个包替换原来的aspose-pdf-21.8.jar包即可。

二、Excel转PDF

1.代码实现

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文件转换
   * @param excelPath 需要被转换的excel全路径带文件名
   * @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 {
          //新建一个pdf文档
          String pdfPath=excelPath.substring(0,excelPath.lastIndexOf("."))+".pdf";
          //Excel文件数据
          Workbook wb = new Workbook(excelPath);
          FileOutputStream fileOS = new FileOutputStream(pdfPath);
          //保存为pdf文件
          wb.save(fileOS, SaveFormat.PDF);
          fileOS.close();
          //转化用时
          long now = System.currentTimeMillis();
          System.out.println("EXCEL 转 Pdf 共耗时：" + ((now - old) / 1000.0) + "秒");
      } catch (Exception e) {
          e.printStackTrace();
      }
  }

}

2.Aspose.License.xml 授权文件

代码如下：

<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>

因为jar已破解其核心验证方法，里面的签名可以随便填写，但是格式尽量保持一致，因为验证其他的格式方法还在！

运行成功截图

Java实现Excel文件转PDF(无水印无限制)