使用itextbox實現pdf的在線預覽

功能實現背景：一個二手車項目，需要能夠打印pdf並且實現在線預覽。

分析：

 （1）在線預覽預覽的是一張圖片，所以我需要在生成pdf之後將pdf轉換爲jpg格式圖片，這裏使用itextbox可以實現。

 （2）我在轉換出圖片後，需要將圖片上傳到公司的圖片服務器，這就需要調用公司的接口，但是公司的上傳接口需要的參數是MultipartFile類型，因此，我需要將File類型的文件轉換成MultipartFile類型，這通過添加spring-test依賴,使用MockMultipartFile的構造方法可以實現。

代碼實現如下：

/**
 * @Author: zy
 * @Description: 打印過戶單據Service
 * @Date: 2018/6/20_19:41
 **/
public PdfOutput printTransferInfo(PrintTransferInfo printTransferInfo) throws Exception{

    Document document = new Document(PageSize.A4);
    /*ByteArrayOutputStream ba=new ByteArrayOutputStream();*/
    //生成文件路徑
    String serialNo = Util.getNowYYYYMMDDHHMMSS();
    String fileNewName = serialNo + UUID.randomUUID().toString().replaceAll("-", "")+".pdf";
    String path = PrintPdfUtil.pdfdir+serialNo+ DataUtil.getCurrent().getStoreid();
    //沒有文件夾就創建
    File existfile =new File(path);
    if(!existfile.exists()){
        existfile.mkdirs(); //創建文件夾
    }
    String pdfPath =  path+File.separator+fileNewName;
    File record = new File(pdfPath);
    FileOutputStream fos=new FileOutputStream(record);

    PdfWriter writer = PdfWriter.getInstance(document, fos);



    document.open();

    Paragraph titleValue=new Paragraph("電子流程辦理單",PrintPdfUtil.title1);
    titleValue.setAlignment(Element.ALIGN_CENTER);  //標題水平居中
    document.add(titleValue);

    //審覈日期，流水號
    PdfPTable table1=new PdfPTable(1);
    table1.setSpacingBefore(24f);
    table1.setTotalWidth(new float[]{100f});

    table1.addCell(getPDFCellNoBorder(printTransferInfo.getUctfexaminetime()==null?"   ":printTransferInfo.getUctfexaminetime(),PrintPdfUtil.content1));
    table1.addCell(getPDFCellNoBorder("流水號 "+(printTransferInfo.getUctftransferno()==null?" ":printTransferInfo.getUctftransferno()),PrintPdfUtil.content1));


    document.add(table1);


     //二維碼圖片
    BarcodeQRCode barcodeQRCode = new BarcodeQRCode(printTransferInfo.getUctftransferno()==null?"   ":printTransferInfo.getUctftransferno(), 100, 100, null);
    Image codeQrImage = barcodeQRCode.getImage();
    /*codeQrImage.scaleAbsolute(100, 100);*/
    codeQrImage.setAbsolutePosition(470,670);
    document.add(codeQrImage);

    //表2
    PdfPTable table2=new PdfPTable(2);
    table2.setSpacingBefore(50f);
    table2.setTotalWidth(new float[]{100f,100f});

    table2.addCell(getPDFCellNoBorder("車牌號："+(printTransferInfo.getUctlicenseplate()==null?" ":printTransferInfo.getUctlicenseplate()),PrintPdfUtil.content1));
    table2.addCell(getPDFCellNoBorder("車架號："+(printTransferInfo.getUctfcarvin()==null?" ":printTransferInfo.getUctfcarvin()),PrintPdfUtil.content1));
    table2.addCell(getPDFCellNoBorder("廠牌型號："+(printTransferInfo.getUctfcarmodel()==null?" ":printTransferInfo.getUctfcarmodel()),PrintPdfUtil.content1));
    table2.addCell(getPDFCellNoBorder("車輛類型："+(printTransferInfo.getUctfcarsize()==null?" ":printTransferInfo.getUctfcarsize()),PrintPdfUtil.content1));
    document.add(table2);

    //買方流程圖及所需證件
    Paragraph titleValue2=new Paragraph("買方流程圖及所需證件",PrintPdfUtil.title2);
    titleValue2.setAlignment(Element.ALIGN_CENTER);  //標題水平居中
    titleValue2.setSpacingBefore(20f);
    document.add(titleValue2);



    // 讀圖片
     Image image = Image.getInstance(PrintPdfUtil.imgpath+"liucheng.png");
    // 根據域的大小縮放圖片
     /*image.scaleToFit(signRect.getWidth(),signRect.getHeight());*/
    // 添加圖片
     image.setAbsolutePosition(0, 200);
     document.add(image);

     //表3

    PdfPTable table3=new PdfPTable(1);
    table3.setSpacingBefore(50f);
    table3.setTotalWidth(new float[]{500f});

    table3.addCell(getPDFCellNoBorder("1.身份證或單位組織機構代碼證原件",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("    ",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("    ",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("    ",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("    ",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("賣方："+(printTransferInfo.getUctfsailername()==null?" ":printTransferInfo.getUctfsailername()),PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("買方："+(printTransferInfo.getUctfbuyername()==null?" ":printTransferInfo.getUctfbuyername()),PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("    ",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("代辦公司：保定市騰達舊車交易市場" +
            "xx汽車信息服務部",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("    ",PrintPdfUtil.content1));
    table3.addCell(getPDFCellNoBorder("錄入員："+(printTransferInfo.getUcsname()==null?" ":printTransferInfo.getUcsname()),PrintPdfUtil.content1));

   PdfContentByte  tb3= writer.getDirectContent();
   ColumnText ct3=new ColumnText(tb3);
   ct3.setSimpleColumn(300,100,600,470,25,Element.ALIGN_LEFT);
   ct3.addElement(table3);
   ct3.go();


   //審覈蓋章、買家簽字
    PdfContentByte  tb4= writer.getDirectContent();
    ColumnText ct4=new ColumnText(tb4);
    ct4.setSimpleColumn(70,70,170,90);
    Phrase phrase4=new Phrase("審覈蓋章",PrintPdfUtil.content1);
    ct4.addText(phrase4);
    ct4.setAlignment(0);
    ct4.go();

    PdfContentByte  tb5= writer.getDirectContent();
    ColumnText ct5=new ColumnText(tb5);
    ct5.setSimpleColumn(350,70,450,90);
    Phrase phrase5=new Phrase("買家簽字：",PrintPdfUtil.content1);
    ct5.addText(phrase5);
    ct5.setAlignment(0);
    ct5.go();


    document.close();

    //將pdf轉換爲img
    List<String> imgs=extractPdfImg(record.getAbsolutePath(),PrintPdfUtil.imgdir);

    //將file轉換爲MultipartFile
    FileInputStream input = new FileInputStream(imgs.get(0));
    MultipartFile multipartFile =  new MockMultipartFile("file", record.getName(), "multipart/form-data", IOUtils.toByteArray(input));


    int picid=fileService.uploadCarImg(multipartFile);

    fos.close();
    writer.close();

    PdfOutput output=new PdfOutput();
    output.setPicid(picid);
    output.setPdfPath(pdfPath);
    return output;
}