FBP自定义服务开发及配置说明 ​

package com.gsoft.mas.fbp.logicflow.task.extension;

import java.util.Map;

public interface ExtensionService {

    /**
     * 执行扩展服务
     * @param execution 执行上下文
     */
    void run(Map<String,Object> execution);
}

package com.gsoft.mas.fbp.logicflow.task.extension;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Map;

public class ExtTaskOne implements ExtensionService{
    public ExtTaskOne(){

    }
    @Override
    public void run(Map<String, Object> execution) {
        //ExtensionServiceTask上配置的参数，以下仅仅打印下来说明参数传递
        for(String key: execution.keySet()){
            System.out.println("execution key:" + key + "  val=:" + execution.get(key));
        }

        //pdf转png图片
        pdf2Png();

        //将本方法计算的结果传递给ExtensionServiceTask，以下仅仅是实例
        execution.put("ExtTaskOne","ExtTaskOne结果");
        
        System.out.println("执行扩展服务ExtTaskOne");
    }

    private void pdf2Png(){
        PDDocument document = null;
        try {

            File pdfFile = new File("D:\\workspace\\pc-server\\locasfbp\\data\\test\\test.pdf");
            document = PDDocument.load(pdfFile);

            PDFRenderer pdfRenderer = new PDFRenderer(document);
            for (int page = 0; page < document.getNumberOfPages(); ++page) {
                BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);

                // 输出格式为PNG的图片文件
                ImageIO.write(bim, "PNG", new File("D:\\workspace\\pc-server\\locasfbp\\data\\test\\output-" + (page + 1) + ".png"));
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            if( document!= null) {
                try {
                    document.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}