在Camel中将远程PDF作为application/pdf返回

<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.26</version>
</dependency>

implementation 'org.apache.pdfbox:pdfbox:2.0.26'

import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.http.HttpComponent;
import org.apache.camel.model.dataformat.PdfDataFormat;

public class PdfRoute extends RouteBuilder {
    @Override
    public void configure() throws Exception {
        // 配置HTTP组件
        HttpComponent httpComponent = getContext().getComponent("http", HttpComponent.class);
        httpComponent.setAllowJavaSerializedObject(true);

        // 配置PDF数据格式
        PdfDataFormat pdfDataFormat = new PdfDataFormat();

        // 定义路由
        from("direct:fetchPdf")
            .setHeader("Accept", constant("application/pdf"))
            .to("http://example.com/remote.pdf")  // 替换为远程PDF文件的URL
            .unmarshal(pdfDataFormat)
            .to("direct:processPdf");

        from("direct:processPdf")
            .setHeader("Content-Type", constant("application/pdf"))
            .to("direct:returnPdf");

        from("direct:returnPdf")
            .setHeader("Content-Disposition", constant("attachment; filename=remote.pdf"))
            .to("direct:end");

        from("direct:end")
            .log("PDF returned successfully");
    }
}