sourcecode/server/gateway-api/src/main/java/com/qxgmat/help/PdfHelp.java

package com.qxgmat.help;

//import com.spire.pdf.PdfDocument;
//import com.spire.pdf.PdfPageBase;
//import com.spire.pdf.graphics.*;
//import com.spire.pdf.widget.PdfPageCollection;
import com.itextpdf.text.*;
import com.itextpdf.text.Font;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;
import com.qxgmat.data.dao.entity.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.awt.*;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created by GaoJie on 2017/11/3.
 */
@Service
public class PdfHelp {
    private static final Logger logger = LoggerFactory.getLogger(PdfHelp.class);

    @Value("${upload.local_path}")
    private String localPath;

    @Value("${upload.web_url}")
    private String webUrl;

    @Value("${upload.offline_path}")
    private String offlinePath;

    @Value("${upload.offline_url}")
    private String offlineUrl;

    @Value("${upload.water}")
    private String water;

    private BaseFont font;

    private int top = 72;

    private int left = 93;

    private int size = 10;

    @Autowired
    private void getFont(@Value("${upload.font}") String path) throws IOException, DocumentException {
        FontFactory.registerDirectories();
        String sub = "";
        if (path.toLowerCase().endsWith(".ttc")){
            sub += ",1";
        }
        if (path.startsWith(".")){
            // 相对路径，从resource中获取
//            logger.debug("{}, {}", path, this.getClass().getClassLoader().getResource(path.replaceFirst(".","")));
//            logger.debug("{}, {}", path, this.getClass().getClassLoader().getResource(path));
            try {
                font = BaseFont.createFont(this.getClass().getClassLoader().getResource(path.replaceFirst(".","")).toString()+sub,BaseFont.IDENTITY_H,true);
            }catch (Exception e){
                font = BaseFont.createFont(this.getClass().getClassLoader().getResource(path).toString()+sub,BaseFont.IDENTITY_H,true);
            }
        }else{
            font = BaseFont.createFont(path+sub,BaseFont.IDENTITY_H,true);
        }
    }

    public static BufferedImage toBufferedImage(Image img)
    {
        if (img instanceof BufferedImage)
        {
            return (BufferedImage) img;
        }

        // Create a buffered image with transparency
        BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);

        // Draw the image on to the buffered image
        Graphics2D bGr = bimage.createGraphics();
        bGr.drawImage(img, 0, 0, null);
        bGr.dispose();

        // Return the buffered image
        return bimage;
    }

    public String[] getUserWater(User user){
        // 2份水印文字
        String mobile = user.getMobile().replaceAll("(\\d{3})\\d*(\\d{4})","$1****$2");
        String name = (user.getRealStatus() > 0? user.getRealName().replaceAll("(.{1}).*(.{1})?","$1*$2 ") : "") + mobile;
        String qx = "千行ID "+String.format("%04d", user.getId());
        return new String[]{name, qx};
    }

    public String getOfflineUrl(String offline){
        return offline.replace(offlinePath, offlineUrl);
    }

    public String generatePdfImage(User user, String pdfUrl, boolean force) throws IOException, DocumentException {
        String pdfFile = pdfUrl.replace(webUrl, localPath);
        String dest = pdfFile.replace(".pdf", String.format("_%d.pdf", user.getId())).replace(localPath, offlinePath);
        File file = new File(dest);

        if (!force && file.exists()){
            return dest;
        }else if(file.exists()){
            file.delete();
        }
        String[] waters = getUserWater(user);

        PdfReader reader = new PdfReader(pdfFile);
        // 如果是web项目，直接下载应该放到response的流里面
        // PdfStamper stamp = new PdfStamper(reader,response.getOutputStream());
        // 添加水印之后的pdf文件
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        int pageSize = reader.getNumberOfPages();
        PdfContentByte under;
        for (int i = 1; i<=pageSize;i++){
            under = stamper.getOverContent(i);
            Rectangle r = reader.getPageSize(i);
            float width = r.getWidth();
            float height = r.getHeight();
            float[] a = new float[]{top, (height/2-top)/2-size/2 + top, height / 2-size/2, (height/2 + (height - top - height/2)/2)-size/2, height-top-size};
            for (int j = 0; j < 5; j ++){
                AddTextWatermark(under, waters[0], Element.ALIGN_LEFT, left, a[j]);
                AddTextWatermark(under, waters[1], Element.ALIGN_CENTER, width / 2,a[j]);
                AddTextWatermark(under, waters[0], Element.ALIGN_RIGHT, width - left,a[j]);
            }
        }
        stamper.close();
        reader.close();
        return dest;
    }
    void AddTextWatermark(PdfContentByte content, String textWatermark, int alignment, float width, float y){
        content.saveState();
//        Font f = new Font(font, 10);
//        f.setColor(0,0,0);
//        f.setStyle(Font.NORMAL);
        PdfGState gs = new PdfGState();
        gs.setFillOpacity(0.2f);
        content.setGState(gs);
//        Phrase p = new Phrase(textWatermark, f);

        content.beginText();
        content.setColorFill(new BaseColor(0,0,0));// 文字水印 颜色
        content.setFontAndSize(font, size);// 文字水印 字体及字号
//        content.setTextMatrix(0, 0);// 文字水印 起始位置
        content.showTextAligned(alignment, textWatermark, width, y, 0);
        content.endText();

        // 在页面中添加多次，计算为止
//        ColumnText.showTextAligned(content,  Element.ALIGN_CENTER, p, 100f,100f, 0);
        content.restoreState();
    }

//    public String generatePdfImage(Integer userId, String pdfUrl, boolean force) throws IOException {
//        String pdfFile = pdfUrl.replace(webUrl, localPath);
//        String dest = pdfFile.replace(".pdf", String.format("_%d.pdf", userId));
//        File file = new File(dest);
//
//        if (!force && file.exists()){
//            return dest;
//        }
//
//        PdfDocument pdf = new PdfDocument();
//        pdf.loadFromFile(pdfFile);
//
//        File srcImgFile = new File(water);
//        Image srcImg = ImageIO.read(srcImgFile);
//
//        BufferedImage bi = toBufferedImage(srcImg);
//        for (Object page: pdf.getPages()) {
//            AddImageWatermark((PdfPageBase)page, bi);
//        }
//
//        //保存
//        pdf.saveToFile(dest);
//        //关闭
//        pdf.close();
//        return dest;
//    }

//    /**
//     * @param page
//     * 要添加水印的页面
//     * @param image
//     * 水印图片路径
//     */
//    static void AddImageWatermark(PdfPageBase page, BufferedImage image)
//    {
//        page.setBackgroundImage(image);
//        Rectangle2D rect = new Rectangle2D.Float();
//        rect.setFrame(page.getClientSize().getWidth()/2 - image.getWidth() / 2, page.getClientSize().getHeight()/2 - image.getHeight()/2, image.getWidth(), image.getHeight());
//        page.setBackgroundRegion(rect);
//    }
//
//    /**
//      * @param page
//      * 要添加水印的页面
//      * @param textWatermark
//      * 水印文字
//      */
//    static void AddTextWatermark(PdfPageBase page, String textWatermark)
//    {
//        Dimension2D dimension2D = new Dimension();
//        dimension2D.setSize(page.getCanvas().getClientSize().getWidth() / 2, page.getCanvas().getClientSize().getHeight() / 3);
//        PdfTilingBrush brush = new PdfTilingBrush(dimension2D);
//        brush.getGraphics().setTransparency(0.3F);
//        brush.getGraphics().save();
//        brush.getGraphics().translateTransform((float) brush.getSize().getWidth() / 2, (float) brush.getSize().getHeight() / 2);
//        brush.getGraphics().rotateTransform(-45);
//        brush.getGraphics().drawString(textWatermark, new PdfTrueTypeFont(new Font("Arial Unicode MS",Font.PLAIN,30),true), PdfBrushes.getRed(), 0, 0, new PdfStringFormat(PdfTextAlignment.Center));
//        brush.getGraphics().restore();
//        brush.getGraphics().setTransparency(1);
//        Rectangle2D loRect = new Rectangle2D.Float();
//        loRect.setFrame(new Point2D.Float(0, 0), page.getCanvas().getClientSize());
//        page.getCanvas().drawRectangle(brush, loRect);
//    }
}