iText 7 许可证文件加载教程：确保运行时可用性与路径配置

import com.itextpdf.licensing.LicenseKey;
import java.io.InputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;

public class LicenseLoader {

    public static void loadLicenseFromClasspath() {
        // 从类路径加载资源流
        try (InputStream licenseStream = LicenseLoader.class.getResourceAsStream("/itextkey.json")) {
            if (licenseStream == null) {
                System.err.println("Error: iText license file 'itextkey.json' not found in classpath.");
                return;
            }
            // 将流写入一个临时文件，因为LicenseKey.loadLicenseFile需要File对象
            Path tempLicenseFile = Files.createTempFile("itextkey", ".json");
            Files.copy(licenseStream, tempLicenseFile, StandardCopyOption.REPLACE_EXISTING);

            LicenseKey.loadLicenseFile(tempLicenseFile.toFile());
            Files.delete(tempLicenseFile); // 加载完成后可以删除临时文件
            System.out.println("iText license loaded successfully from classpath.");
        } catch (IOException e) {
            System.err.println("Error loading iText license from classpath: " + e.getMessage());
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        loadLicenseFromClasspath();
        // ... 后续的iText操作
    }
}

using System;
using System.IO;
using iText.Licensing.Base; // iText 7 for .NET 的许可证命名空间

public class LicenseLoader
{
    public static void LoadLicenseFromFile()
    {
        // 获取当前应用程序的基目录
        string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
        // 构建许可证文件的完整路径
        string licenseFilePath = Path.Combine(baseDirectory, "itextkey.json");

        if (File.Exists(licenseFilePath))
        {
            try
            {
                // 加载许可证文件
                LicenseKey.LoadLicenseFile(licenseFilePath);
                Console.WriteLine("iText license loaded successfully from: " + licenseFilePath);
            }
            catch (Exception ex)
            {
                Console.Error.WriteLine("Error loading iText license: " + ex.Message);
            }
        }
        else
        {
            Console.Error.WriteLine("Error: iText license file not found at: " + licenseFilePath);
        }
    }

    public static void Main(string[] args)
    {
        LoadLicenseFromFile();
        // ... 后续的iText操作
    }
}

import com.itextpdf.licensing.LicenseKey;
import java.io.File;

public class RelativePathLoader {
    public static void loadLicense() {
        // 假设 itextkey.json 位于应用程序的当前工作目录
        File licenseFile = new File("itextkey.json");
        if (licenseFile.exists()) {
            try {
                LicenseKey.loadLicenseFile(licenseFile);
                System.out.println("iText license loaded successfully from current directory.");
            } catch (Exception e) {
                System.err.println("Error loading iText license: " + e.getMessage());
                e.printStackTrace();
            }
        } else {
            System.err.println("Error: iText license file 'itextkey.json' not found in current directory: " + licenseFile.getAbsolutePath());
        }
    }

    public static void main(String[] args) {
        loadLicense();
        // ... iText操作
    }
}

import com.itextpdf.licensing.LicenseKey;
import java.io.File;

public class SubdirectoryLoader {
    public static void loadLicense() {
        // 假设 itextkey.json 位于应用程序当前工作目录下的 'config' 文件夹
        File licenseFile = new File("config/itextkey.json");
        if (licenseFile.exists()) {
            try {
                LicenseKey.loadLicenseFile(licenseFile);
                System.out.println("iText license loaded successfully from config subdirectory.");
            } catch (Exception e) {
                System.err.println("Error loading iText license: " + e.getMessage());
                e.printStackTrace();
            }
        } else {
            System.err.println("Error: iText license file 'itextkey.json' not found in config subdirectory: " + licenseFile.getAbsolutePath());
        }
    }

    public static void main(String[] args) {
        loadLicense();
        // ... iText操作
    }
}