图片分页
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lijiazhuo
274
src/main/java/com/example/sso/dao/Photo.java
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274
src/main/java/com/example/sso/dao/Photo.java
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package com.example.sso.dao;
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import com.itextpdf.io.image.ImageData;
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import com.itextpdf.io.image.ImageDataFactory;
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import com.itextpdf.kernel.font.PdfFont;
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import com.itextpdf.kernel.font.PdfFontFactory;
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import com.itextpdf.kernel.geom.PageSize;
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import com.itextpdf.kernel.pdf.PdfDocument;
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import com.itextpdf.kernel.pdf.PdfWriter;
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import com.itextpdf.layout.Document;
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import com.itextpdf.layout.element.Image;
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import com.itextpdf.layout.element.Paragraph;
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import com.itextpdf.layout.properties.TextAlignment;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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public class Photo {
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private static PdfDocument pdfDoc = null;
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private static Document document = null;
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private static String currentPdfPath = null;
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/**
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* 开始创建PDF
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*/
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public static void startPDF(String pdfPath) throws IOException {
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if (pdfDoc != null) {
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closePDF();
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}
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/* currentPdfPath = pdfPath;
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PdfWriter writer = new PdfWriter(pdfPath);
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pdfDoc = new PdfDocument(writer);
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// document = new Document(pdfDoc);
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// 创建文档时设置0边距
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document = new Document(pdfDoc, PageSize.A4, false);
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// 设置页边距为0
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document.setMargins(0, 0, 0, 0);
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// 或者使用具体的值
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// document.setMargins(0f, 0f, 0f, 0f);
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// 移除默认的页眉页脚
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pdfDoc.getDefaultPageSize();*/
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currentPdfPath = pdfPath;
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PdfWriter writer = new PdfWriter(pdfPath);
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pdfDoc = new PdfDocument(writer);
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// A4纸的标准宽度是595点（约210mm），高度自定义
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// PageSize.A4.getWidth() 获取A4宽度
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PageSize customPageSize = new PageSize(PageSize.A4.getWidth(), 842*20);
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document = new Document(pdfDoc, customPageSize, false);
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document.setMargins(0, 0, 0, 0);
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System.out.println("开始创建PDF: " + pdfPath);
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}
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/**
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* 添加图片章节
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*/
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public static void appendImageSection(String imagePath) throws IOException {
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if (document == null) {
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throw new IllegalStateException("请先调用 startPDF() 方法");
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}
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// 添加章节标题
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// document.add(new Paragraph("图片部分")
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// .setFontSize(20)
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// .setBold()
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// .setMarginTop(20));
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// 添加图片
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if (imagePath != null && new File(imagePath).exists()) {
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ImageData imageData = ImageDataFactory.create(imagePath);
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Image image = new Image(imageData);
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// image.setAutoScale(true);
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image.setHorizontalAlignment(com.itextpdf.layout.properties.HorizontalAlignment.CENTER);
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image.setMarginTop(5);
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image.setMarginBottom(5);
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image.setHeight(200);
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image.setWidth(200);
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document.add(image);
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// document.add(new Paragraph("图片说明")
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// .setFontSize(10)
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// .setItalic()
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// .setTextAlignment(com.itextpdf.layout.properties.TextAlignment.CENTER));
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}
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System.out.println("已添加图片章节");
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}
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/**
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* 添加文本章节
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*/
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public static void appendTextSection(String text) throws IOException {
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if (document == null) {
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throw new IllegalStateException("请先调用 startPDF() 方法");
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}
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PdfFont chineseFont = PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H");
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// 添加章节标题
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document.add(new Paragraph(text)
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.setFont(chineseFont)
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.setFontSize(20)
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.setBold()
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.setMarginTop(20));
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/* // 添加文本
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if (text != null && !text.trim().isEmpty()) {
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String[] paragraphs = text.split("\n");
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for (String para : paragraphs) {
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document.add(new Paragraph(para)
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.setFontSize(12)
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.setMarginBottom(10));
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}
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}*/
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System.out.println("已添加文本章节");
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}
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public static void TextAlignment(String text) throws IOException {
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if (document == null) {
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throw new IllegalStateException("请先调用 startPDF() 方法");
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}
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PdfFont chineseFont = PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H");
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// 创建段落并设置居中对齐
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Paragraph paragraph = new Paragraph(text)
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.setFont(chineseFont)
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.setFontSize(20)
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.setBold()
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.setMarginTop(20)
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.setTextAlignment(TextAlignment.CENTER); // 添加这行实现居中
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document.add(paragraph);
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System.out.println("已添加文本章节");
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}
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public static void appendTextSections(String text) throws IOException {
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if (document == null) {
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throw new IllegalStateException("请先调用 startPDF() 方法");
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}
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PdfFont chineseFont = PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H");
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// 添加章节标题
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// 设置绝对位置在页面底部
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Paragraph paragraph = new Paragraph(text);
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float pageHeight = PageSize.A4.getHeight(); // 842点
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float bottomMargin = 50; // 距离底部50点
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float leftMargin = 400; // 左边距
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paragraph.setFixedPosition(leftMargin, bottomMargin, PageSize.A4.getWidth() - 40).setFont(chineseFont);
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document.add(paragraph);
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/* // 添加文本
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if (text != null && !text.trim().isEmpty()) {
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String[] paragraphs = text.split("\n");
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for (String para : paragraphs) {
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document.add(new Paragraph(para)
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.setFontSize(12)
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.setMarginBottom(10));
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}
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}*/
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System.out.println("已添加文本章节");
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}
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/**
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* 添加分页符
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*/
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public static void addPageBreak() {
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if (document != null) {
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document.add(new com.itextpdf.layout.element.AreaBreak());
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System.out.println("已添加分页符");
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}
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}
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/**
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* 关闭并保存PDF
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*/
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public static void closePDF() {
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if (document != null) {
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document.close();
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document = null;
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}
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if (pdfDoc != null) {
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pdfDoc.close();
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pdfDoc = null;
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}
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System.out.println("PDF已保存: " + currentPdfPath);
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currentPdfPath = null;
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}
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/**
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* 快速使用示例
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*/
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public static void createPDFWithMultipleSections(String pdfPath) throws IOException {
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startPDF(pdfPath);
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// 添加各种内容
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appendTextSection("这是文档的第一部分\n包含一些介绍性的文字");
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appendImageSection("image1.jpg");
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appendTextSection("这是图片1的描述文字");
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appendImageSection("image2.png");
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appendTextSection("这是图片2的描述文字");
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// 关闭并保存
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closePDF();
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}
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public static void createSimpleChinesePDF() throws IOException {
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// 1. 创建PDF
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PdfWriter writer = new PdfWriter("D:\\下载模板\\a.pdf");
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PdfDocument pdfDoc = new PdfDocument(writer);
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Document document = new Document(pdfDoc);
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// 2. 加载中文字体（必须要有font-asian依赖）
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PdfFont chineseFont = PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H");
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// 3. 添加中文内容
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Paragraph title = new Paragraph("中文标题")
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.setFont(chineseFont)
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.setFontSize(20)
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.setBold();
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document.add(title);
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Paragraph content = new Paragraph("这是中文内容，可以正常显示。")
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.setFont(chineseFont)
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.setFontSize(12);
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document.add(content);
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// 4. 关闭文档
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document.close();
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System.out.println("PDF创建完成");
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}
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public static void main(String[] args) {
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try {
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createSimpleChinesePDF();
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} catch (IOException e) {
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System.out.println("错误: " + e.getMessage());
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System.out.println("请确保添加了 font-asian 依赖");
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}
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}
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}
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