java-web 导出pdf文件并增加水印和照片

一、下载相应的jar包 itextpdf.jar itext-asian.jar

Maven 项目直接导入：

<dependency>

           <groupId>com.itextpdf</groupId>

           <artifactId>itextpdf</artifactId>

           <version>5.3.2</version>

        </dependency>

        <dependency>

           <groupId>com.itextpdf</groupId>

           <artifactId>itext-asian</artifactId>

           <version>5.2.0</version>

         </dependency>

二、导出过程详解

1.      申明一个文档类型建立一个Document对象，设置页面样式

Document document = new Document();

Rectangle pageSize = newRectangle(PageSize.A4);

document.setPageSize(pageSize);

2.      开启document 对象

document.open();

3.      构造表格table

PdfPTable table = PdfUtil.createTable(4);

4.      向document增加table

 document.add(table);

     

5.      关闭document

document.close();

下面是实现的源码：

PDFReport.java

package com.test.work.pdf;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;

/**
 * Created by SuperChen on 2016/11/22.
 */
public class PDFReport {
    /**
     * @author  By SuperChen:
     * @version 创建时间：2016年11月21日 下午2:29:51
     * PDFReportTODO
     */
    Document document = new Document();// 建立一个Document对象

    public PDFReport(String out) {
        try {
            File file = new File(out);
            file.createNewFile();
            Rectangle pageSize = new Rectangle(PageSize.A4);
            document.setPageSize(pageSize);
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
            PDFBuilder builder = new PDFBuilder();
            writer.setPageEvent(builder);
            document.open();
            PdfPTable table = generatePDF();
            document.add(table);
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public PdfPTable generatePDF() throws Exception{
        PdfPTable table = PdfUtil.createTable(4);
        table.addCell(PdfUtil.createHeadCell("学生信息列表"));
        table.addCell(PdfUtil.createTitleCell("姓名"));
        table.addCell(PdfUtil.createTitleCell("年龄"));
        table.addCell(PdfUtil.createTitleCell("性别"));
        table.addCell(PdfUtil.createTitleCell("地址"));

        for(int i=0;i<6;i++){
            table.addCell(PdfUtil.createCell("姓名" + i));
            table.addCell(PdfUtil.createCell(i + 15 + ""));
            table.addCell(PdfUtil.createCell((i % 2 == 0) ? "男" : "女"));
            table.addCell(PdfUtil.createCell("北京天安门" + i));
        }
        return table;
    }


    public static void main(String[] args) throws Exception {
        System.out.println("pdf导出成功！");
        new PDFReport("d:/test.pdf").generatePDF();
        PdfUtil.addImage("d:/test.pdf", "d:/test2.pdf");
    }
}

PdfUtil.java

package com.test.work.pdf;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;

/**
 * Created by SuperChen on 2016/12/2.
 */
public class PdfUtil {

    private static Font headfont ;// 设置字体大小
    private static Font keyfont;// 设置字体大小
    private static Font textfont;// 设置字体大小

    static{
        BaseFont bfChinese;
        try {
            bfChinese = BaseFont.createFont("STSong-Light","UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
            headfont = new Font(bfChinese, 12, Font.BOLD,BaseColor.BLACK);// 设置字体大小
            keyfont = new Font(bfChinese, 10, Font.BOLD,new BaseColor(108,0,108));// 设置字体大小
            textfont = new Font(bfChinese, 8, Font.NORMAL,BaseColor.BLACK);// 设置字体大小
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //表格标题
    public static PdfPCell createHeadCell(String value){
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(15);
        cell.setHorizontalAlignment(15);
        cell.setColspan(9);
        cell.setPhrase(new Phrase(value,headfont));
        cell.setPadding(10.0f);
        cell.setBorder(0);
        cell.setPaddingTop(15.0f);
        cell.setPaddingBottom(8.0f);
        return cell;
    }

    //表格表头
    public static  PdfPCell createTitleCell(String value){
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
        cell.setPhrase(new Phrase(value, keyfont));
        cell.setBackgroundColor(new BaseColor(0, 204, 255));
        return cell;
    }

    //表格内容
    public static PdfPCell createCell(String value){
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
        cell.setPhrase(new Phrase(value,textfont));
        cell.setBackgroundColor(new BaseColor(255, 255, 153));
        return cell;
    }


    //生成表格
    public static PdfPTable createTable(int colNumber){
        PdfPTable table = new PdfPTable(colNumber);
        try{
            table.setLockedWidth(true);
            table.setTotalWidth(500);
            table.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.getDefaultCell().setBorder(1);
        }catch(Exception e){
            e.printStackTrace();
        }
        return table;
    }

    public static  void addImage(String input,String output) throws Exception{
        BufferedOutputStream out = new BufferedOutputStream(
                new FileOutputStream(new File(output)));
        PdfReader reader = new PdfReader(input);
        PdfStamper stamper = new PdfStamper(reader, out);
        addWatermark(stamper,"我是测试水印文字");
        int total = reader.getNumberOfPages();
        try {
            Image image = Image.getInstance("d:/1.png");
            image.setAbsolutePosition(350, 100); // set the first background image of the absolute
            image.scaleToFit(120, 120);
            PdfContentByte content= stamper.getOverContent(total);// 在内容上方加水印
            content.addImage(image);
        }catch (Exception e){
            System.out.println("123");
        }

        stamper.close();
        reader.close();
    }

    public static void addWatermark(PdfStamper pdfStamper, String waterMarkName) throws Exception {
        PdfContentByte content = null;
        BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",
                BaseFont.NOT_EMBEDDED);
        Rectangle pageRect = null;
        PdfGState gs = new PdfGState();
        try {
            if (base == null || pdfStamper == null) {
                return;
            }
            // 设置透明度为0.4
            gs.setFillOpacity(0.4f);
            gs.setStrokeOpacity(0.4f);
            int toPage = pdfStamper.getReader().getNumberOfPages();
            for (int i = 1; i <= toPage; i++) {
                pageRect = pdfStamper.getReader().getPageSizeWithRotation(i);
                // 计算水印X,Y坐标
                float x = pageRect.getWidth() / 2;
                float y = pageRect.getHeight() / 2;
                // 获得PDF最顶层
                content = pdfStamper.getOverContent(i);
                content.saveState();
                // set Transparency
                content.setGState(gs);
                content.beginText();
                content.setColorFill(BaseColor.GRAY);
                content.setFontAndSize(base, 30);
                // 水印文字成45度角倾斜
                content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, x,
                        y, 45);
                content.endText();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}

PDFBuilder.java

package com.test.work.pdf;

/**
 * Created by SuperChen on 2016/11/22.
 */

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

import java.io.IOException;


/**
 * 设置页面附加属性
 *
 */
public class PDFBuilder extends PdfPageEventHelper {

    /**
     * 页眉
     */
    public String header = "";

    /**
     * 文档字体大小，页脚页眉最好和文本大小一致
     */
    public int presentFontSize = 12;


    // 模板
    public PdfTemplate total;

    // 基础字体对象
    public BaseFont bf = null;

    // 利用基础字体生成的字体对象，一般用于生成中文文字
    public Font fontDetail = null;

    /**
     *
     * Creates a new instance of PdfReportM1HeaderFooter 无参构造方法.
     *
     */
    public PDFBuilder() {

    }



    public void setHeader(String header) {
        this.header = header;
    }

    /**
     *
     * TODO 文档打开时创建模板
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(com.itextpdf.text.pdf.PdfWriter,
     *      com.itextpdf.text.Document)
     */
    public void onOpenDocument(PdfWriter writer, Document document) {
        total = writer.getDirectContent().createTemplate(50, 50);// 共 页 的矩形的长宽高
    }

    /**
     *
     * TODO 关闭每页的时候，写入页眉，写入'第几页共'这几个字。
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(com.itextpdf.text.pdf.PdfWriter,
     *      com.itextpdf.text.Document)
     */
    public void onEndPage(PdfWriter writer, Document document) {
        this.addPage(writer, document);
    }

    //加分页
    public void addPage(PdfWriter writer, Document document){
        try {
            if (bf == null) {
                bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
            }
            if (fontDetail == null) {
                fontDetail = new Font(bf, presentFontSize, Font.NORMAL);// 数据体字体
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 1.写入页眉
        ColumnText.showTextAligned(writer.getDirectContent(),
                Element.ALIGN_LEFT, new Phrase(header, fontDetail),
                document.left(), document.top() + 20, 0);
        // 2.写入前半部分的 第 X页/共
        int pageS = writer.getPageNumber();
        String foot1 = "第 " + pageS + " 页 /共";
        Phrase footer = new Phrase(foot1, fontDetail);

        // 3.计算前半部分的foot1的长度，后面好定位最后一部分的'Y页'这俩字的x轴坐标，字体长度也要计算进去 = len
        float len = bf.getWidthPoint(foot1, presentFontSize);

        // 4.拿到当前的PdfContentByte
        PdfContentByte cb = writer.getDirectContent();

        // 5.写入页脚1，x轴就是(右margin+左margin + right() -left()- len)/2.0F
        // 再给偏移20F适合人类视觉感受，否则肉眼看上去就太偏左了
        // ,y轴就是底边界-20,否则就贴边重叠到数据体里了就不是页脚了；注意Y轴是从下往上累加的，最上方的Top值是大于Bottom好几百开外的。
        ColumnText
                .showTextAligned(
                        cb,
                        Element.ALIGN_CENTER,
                        footer,
                        (document.rightMargin() + document.right()
                                + document.leftMargin() - document.left() - len) / 2.0F + 20F,
                        document.bottom() - 20, 0);

        // 6.写入页脚2的模板（就是页脚的Y页这俩字）添加到文档中，计算模板的和Y轴,X=(右边界-左边界 - 前半部分的len值)/2.0F +
        // len ， y 轴和之前的保持一致，底边界-20
        cb.addTemplate(total, (document.rightMargin() + document.right()
                        + document.leftMargin() - document.left()) / 2.0F + 20F,
                document.bottom() - 20); // 调节模版显示的位置

    }


    /**
     *
     * TODO 关闭文档时，替换模板，完成整个页眉页脚组件
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(com.itextpdf.text.pdf.PdfWriter,
     *      com.itextpdf.text.Document)
     */
    public void onCloseDocument(PdfWriter writer, Document document) {
        // 7.最后一步了，就是关闭文档的时候，将模板替换成实际的 Y 值,至此，page x of y 制作完毕，完美兼容各种文档size。
        total.beginText();
        total.setFontAndSize(bf, presentFontSize);// 生成的模版的字体、颜色
        String foot2 = " " + (writer.getPageNumber()-1) + " 页";
        total.showText(foot2);// 模版显示的内容
        total.endText();
        total.closePath();
    }
}