Java实现压缩 PDF文件大小的示例代码

  <repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>11.8.3</version>
    </dependency>
</dependencies>

import com.spire.pdf.conversion.compression.PdfCompressor;

public class CompressContent {
    public static void main(String[] args){
        // 创建一个PdfCompressor实例
        PdfCompressor compressor = new PdfCompressor("示例.pdf");

        // 启用文档内容压缩
        compressor.getOptions().setCompressContents(true);

        // 压缩并保存
        compressor.compressToFile("内容压缩.pdf");
    }
}

import com.spire.pdf.conversion.compression.ImageCompressionOptions;
import com.spire.pdf.conversion.compression.ImageQuality;
import com.spire.pdf.conversion.compression.PdfCompressor;

public class CompressImages {
    public static void main(String[] args){
        // 加载 PDF 文档
        PdfCompressor compressor = new PdfCompressor("示例.pdf");

        // 获取图片压缩选项
        ImageCompressionOptions imageCompression = compressor.getOptions().getImageCompressionOptions();

        // 压缩图片并设置质量
        imageCompression.setCompressImage(true);          // 启用图片压缩
        imageCompression.setImageQuality(ImageQuality.Low); // 设置图片质量（低、中、高）
        imageCompression.setResizeImages(true);           // 允许调整图片大小以减少文件大小

        // 保存压缩后的 PDF
        compressor.compressToFile("图片压缩.pdf");
    }
}

import com.spire.pdf.conversion.compression.PdfCompressor;
import com.spire.pdf.conversion.compression.TextCompressionOptions;

public class CompressFont {
    public static void main(String[] args){
        // 加载 PDF 文档
        PdfCompressor compressor = new PdfCompressor("示例.pdf");

        // 获取TextCompressionOptions对象
        TextCompressionOptions textCompression = compressor.getOptions().getTextCompressionOptions();

        // 启用字体压缩
        textCompression.setCompressFonts(true);

        // 可选：启用取消嵌入字体
        // textCompression.setUnembedFonts(true);

        // 压缩文档并保存
        compressor.compressToFile("字体压缩.pdf");
    }
}

import com.spire.pdf.conversion.compression.PdfCompressor;

public class CompressPDFByRemovingMetadata {
    public static void main(String[] args){
        // 加载 PDF 文档
        PdfCompressor compressor = new PdfCompressor("示例.pdf");

        // 启用元数据移除
        compressor.getOptions().setRemoveMetadata(true);

        // 压缩文档并保存
        compressor.compressToFile("移除元数据.pdf");
    }
}