Java生成PDF的实现。

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代码示例：
import com.itextpdf.text.*;import com.itextpdf.text.Font;import com.itextpdf.text.Image;import com.itextpdf.text.List;import com.itextpdf.text.pdf.*;import org.junit.After;import org.junit.Before;import org.junit.Test;import java.awt.*;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.net.URL;import java.util.ArrayList;/** * Created by roztop1 on 2017/3/31. */public class TestPDF {    private static final String FILE_PATH = "D:/test.pdf";    // 1.新建document对象    private Document document = null;    private File file = null;    @Before    public void init() throws IOException {        document = new Document();        file = getFile(FILE_PATH);    }    @After    public void open() throws IOException {        openFile(file);    }    /**     * 打开本地文件     *     * @param file     * @throws IOException     */    public static void openFile(File file) throws IOException {        Desktop.getDesktop().open(file);    }    public static void openFile(String file_path) throws IOException {        Desktop.getDesktop().open(getFile(file_path));    }    /**     * 获取文件     *     * @param filePath     * @return     */    public static File getFile(String filePath) {        File file = new File(filePath);        return file;    }    /**     * 初体验     *     * @throws DocumentException     * @throws FileNotFoundException     */    @Test    public void testStart() throws DocumentException, IOException {        // 2.建立一个书写器(Writer)与document对象关联，通过书写器(Writer)可以将文档写入到磁盘中。        // 创建 PdfWriter 对象 第一个参数是对文档对象的引用，第二个参数是文件的实际名称，在该名称中还会给出其输出路径。        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        // 3.打开文档        document.open();        // 4.添加一个内容段落        document.add(new Paragraph("Hello World!PDF"));        // 5.关闭文档        document.close();        writer.close();    }    /**     * PDF设置属性     *     * @throws IOException     * @throws DocumentException     */    @Test    public void setPDFFiled() throws IOException, DocumentException {        //建立一个书写器        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        //打开文件        document.open();        //添加内容        document.add(new Paragraph("can't chines to PDF"));        //设置属性        //标题        document.addTitle("this is title");        //作者        document.addAuthor("NOW");        //主题        document.addSubject("this is subject");        //关键字        document.addKeywords("PDF");        //创建时间        document.addCreationDate();        //应用程序        document.addCreator("pdf");        //关闭文档        document.close();        //关闭书写器        writer.close();    }    /**     * PDF写入img     *     * @throws IOException     * @throws DocumentException     */    @Test    public void setPDFImg() throws IOException, DocumentException {        //建立一个书写器        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        //打开文件        document.open();        //添加内容        document.add(new Paragraph("HD content here"));        //图片1        Image image1 = Image.getInstance(new URL("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1490939858438&di=2843ce3aa39a7d6c261b87ab58b13d93&imgtype=0&src=http%3A%2F%2Fv1.qzone.cc%2Fpic%2F201701%2F22%2F16%2F54%2F5884732f13e05732.jpg%2521600x600.jpg"));        //设置图片位置的x轴和y周        image1.setAbsolutePosition(100f, 550f);        //设置图片的宽度和高度        image1.scaleAbsolute(200, 200);        //将图片1添加到pdf文件中        document.add(image1);        //图片2        Image image2 = Image.getInstance(new URL("https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1490929743&di=b1c8504e10d04ca6736c9134d1c57fee&src=http://v1.qzone.cc/pic/201701/22/16/53/5884732676930797.jpg!600x600.jpg"));        //将图片2添加到pdf文件中        document.add(image2);        //关闭文档        document.close();        //关闭书写器        writer.close();    }    /**     * PDF中创建表格     */    @Test    public void setTable() throws FileNotFoundException, DocumentException {        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        //打开文件        document.open();        //添加内容        document.add(new Paragraph("HD content here"));        // 3列的表.        PdfPTable table = new PdfPTable(3);        table.setWidthPercentage(100); // 宽度100%填充        table.setSpacingBefore(10f); // 前间距        table.setSpacingAfter(10f); // 后间距        ArrayList<PdfPRow> listRow = table.getRows();        //设置列宽        float[] columnWidths = {1f, 2f, 3f};        table.setWidths(columnWidths);        //行1        PdfPCell cells1[] = new PdfPCell[3];        PdfPRow row1 = new PdfPRow(cells1);        //单元格        cells1[0] = new PdfPCell(new Paragraph("111"));//单元格内容        cells1[0].setBorderColor(BaseColor.BLUE);//边框验证        cells1[0].setPaddingLeft(20);//左填充20        cells1[0].setHorizontalAlignment(Element.ALIGN_CENTER);//水平居中        cells1[0].setVerticalAlignment(Element.ALIGN_MIDDLE);//垂直居中        cells1[1] = new PdfPCell(new Paragraph("222"));        cells1[2] = new PdfPCell(new Paragraph("333"));        //行2        PdfPCell cells2[] = new PdfPCell[3];        PdfPRow row2 = new PdfPRow(cells2);        cells2[0] = new PdfPCell(new Paragraph("444"));        //把第一行添加到集合        listRow.add(row1);        listRow.add(row2);        //把表格添加到文件中        document.add(table);        //关闭文档        document.close();        //关闭书写器        writer.close();    }    /**     * PDF中创建列表     */    @Test    public void setList() throws FileNotFoundException, DocumentException {        //建立一个书写器        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        //打开文件        document.open();        //添加内容        document.add(new Paragraph("HD content here"));        //添加有序列表        List orderedList = new List(List.ORDERED);        orderedList.add(new ListItem("Item one"));        orderedList.add(new ListItem("Item two"));        orderedList.add(new ListItem("Item three"));        document.add(orderedList);        //关闭文档        document.close();        //关闭书写器        writer.close();    }    /**     * PDF中设置样式/格式化输出，输出中文内容，必须引入itext-asian.jar     */    @Test    public void setStyle() throws IOException, DocumentException {        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        //打开文件        document.open();        //中文字体,解决中文不能显示问题        BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);        //蓝色字体        Font blueFont = new Font(bfChinese);        blueFont.setColor(BaseColor.BLUE);        //段落文本        Paragraph paragraphBlue = new Paragraph("paragraphOne blue front", blueFont);        document.add(paragraphBlue);        //绿色字体        Font greenFont = new Font(bfChinese);        greenFont.setColor(BaseColor.GREEN);        //创建章节        Paragraph chapterTitle = new Paragraph("段落标题xxxx", greenFont);        Chapter chapter1 = new Chapter(chapterTitle, 1);        chapter1.setNumberDepth(0);        Paragraph sectionTitle = new Paragraph("部分标题", greenFont);        Section section1 = chapter1.addSection(sectionTitle);        Paragraph sectionContent = new Paragraph("部分内容", blueFont);        section1.add(sectionContent);        //将章节添加到文章中        document.add(chapter1);        //关闭文档        document.close();        //关闭书写器        writer.close();    }    /**     * PDF设置密码     *     * @throws FileNotFoundException     * @throws DocumentException     */    @Test    public void setPWD() throws FileNotFoundException, DocumentException {        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        //用户密码        String userPassword = "123456";        //拥有者密码        String ownerPassword = "hd";        writer.setEncryption(userPassword.getBytes(), ownerPassword.getBytes(), PdfWriter.ALLOW_PRINTING,                PdfWriter.ENCRYPTION_AES_128);        // 打开文件        document.open();        //添加内容        document.add(new Paragraph("password !!!!"));        // 关闭文档        document.close();        // 关闭书写器        writer.close();    }    /**     * 设置权限     */    @Test    public void setPermission() throws Exception {        // 建立一个书写器        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));        // 只读权限        writer.setEncryption("".getBytes(), "".getBytes(), PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);        // 打开文件        document.open();        // 添加内容        document.add(new Paragraph("password !!!!"));        // 关闭文档        document.close();        // 关闭书写器        writer.close();    }    /**     * 读取/修改已有的PDF文件     */    @Test    public void readOrUpdatePDF() throws Exception {        //读取pdf文件        PdfReader pdfReader = new PdfReader(FILE_PATH);        //修改器        PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileOutputStream("D:/test2.pdf"));        Image image = Image.getInstance(new URL("https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1490929743&di=b1c8504e10d04ca6736c9134d1c57fee&src=http://v1.qzone.cc/pic/201701/22/16/53/5884732676930797.jpg!600x600.jpg"));        image.scaleAbsolute(50, 50);        image.setAbsolutePosition(0, 700);        for (int i = 1; i <= pdfReader.getNumberOfPages(); i++) {            PdfContentByte content = pdfStamper.getUnderContent(i);            content.addImage(image);        }        pdfStamper.close();        openFile("D:/test2.pdf");    }}
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