java-servers/servers/boe-server-all/src/main/java/com/xboe/converter/PPTToPdfConverter.java

package com.xboe.converter;

import java.io.*;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import com.aspose.slides.Presentation;
import com.xboe.common.utils.StringUtil;
import com.xboe.core.SysConstant;
import com.xboe.module.course.service.ICourseFileConverter;
import com.xboe.standard.BaseConstant;

/**
 * ppt转化为pdf
 * <p>
 * https://www.cnblogs.com/name-lizonglin/p/12836451.html
 *
 * @author seastar
 */
@Slf4j
@Component
public class PPTToPdfConverter implements ICourseFileConverter {

    private static String types = "ppt,pptx";

    private static boolean loadLicense = false;

    /**
     * 获取license
     *
     * @return
     */
    public boolean getLicense() {
        if (!loadLicense) {
            InputStream is=null;
            try {
                is = this.getClass().getResourceAsStream("/aspose/license.xml");
                com.aspose.slides.License aposeLic = new com.aspose.slides.License();
                aposeLic.setLicense(is);
                loadLicense = true;
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if(is!=null){
                    try {
                        is.close();
                    } catch (IOException e) {
                        log.error("关流异常",e);
                    }
                }
            }
        }
        return loadLicense;
    }

    @Override
    public boolean canConvert(String fileType) {
        //检查是否可以转化
        if (StringUtil.isNotBlank(fileType) && types.indexOf(fileType.toLowerCase()) > -1) {
            return true;
        }
        return false;
    }

    @Override
    public String convert(String fileType, String filePath) throws Exception{
        if (filePath.contains("..")) {
            throw new SecurityException("输入路径包含不安全的字符");
        }

        if (this.getLicense()) {
            InputStream slides=null;
            Presentation pres=null;
            File file=null;
            FileOutputStream fileOS=null;
            String previewPath = null;
            try {
                String savePath = SysConstant.getConfigValue(BaseConstant.CONFIG_UPLOAD_FILES_SAVEPATH);
                previewPath = filePath.substring(0, filePath.indexOf(fileType)) + "pdf";
                slides = new FileInputStream(new File(savePath + filePath));// 原始ppt路径
                pres = new Presentation(slides);
                file = new File(savePath + previewPath);// 输出pdf路径
                //设置文件属性
                //.setAttribute(file, "dos:archive", false);

                fileOS = new FileOutputStream(file);

                pres.save(fileOS, com.aspose.slides.SaveFormat.Pdf);
            } catch (FileNotFoundException e) {
//                e.printStackTrace();
                log.error("转化异常",e);
            }finally {
                if (fileOS!=null) {
                    try {
                        fileOS.close();
                    } catch (IOException e) {
                        log.error("关流异常",e);
                    }
                }
            }

            return previewPath;
           
        }
        return null;
    }

}