Java编程技巧：将图片导出成pdf文件

目录

      • 一、pom依赖
      • 二、代码
      • 三、测试链接
      • 四、结果展示

一、pom依赖

<!-- pdf插件 start -->
<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.3</version>
</dependency>
<dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version>
</dependency>
<!-- pdf插件 end --><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.16</version>
</dependency>

二、代码

import cn.hutool.core.io.FileUtil;
import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import lombok.SneakyThrows;
import org.springframework.util.ResourceUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletResponse;
import javax.xml.bind.DatatypeConverter;
import java.io.*;@RestController
@RequestMapping("/test")
public class TestController {// 公文格式-页边距 start// 上页边距(单位：cm)private static final double TOP = 3.7;// 上页边距(单位：cm)private static final double BOTTOM = 3.5;// 上页边距(单位：cm)private static final double LEFT = 2.8;// 上页边距(单位：cm)private static final double RIGHT = 2.6;// 公文格式-页边距 end// 厘米转磅private static final double CM_2_POUND = 28.35;/*** 将base64编码图片字符串转换为pdf，然后在浏览器中下载* 模拟场景：从数据库中读取base64图片编码，然后进行下载*/@GetMapping("/base642pdf")public void base642pdf(HttpServletResponse response) {// 准备数据String base64 = "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fileName = "中国城市-导图版";// 公文格式页边距float marginLeft = Math.round(LEFT * CM_2_POUND);float marginRight = Math.round(RIGHT * CM_2_POUND);float marginTop = Math.round(TOP * CM_2_POUND);float marginBottom = Math.round(BOTTOM * CM_2_POUND);Document document = null;OutputStream os = null;try {// 设置response属性os = response.getOutputStream();response.setContentType("application/force-download");try {fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");} catch (UnsupportedEncodingException e) {e.printStackTrace();}response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".pdf");// 设置pdf页面大小document = new Document(PageSize.A4, marginLeft, marginRight, marginTop, marginBottom);document.addTitle(fileName);// 处理图片数据、居中byte[] bytes = DatatypeConverter.parseBase64Binary(base64);Image img = Image.getInstance(bytes);img.setAlignment(Image.MIDDLE);// 处理图片缩放比率float contentWidth = PageSize.A4.getWidth() - marginLeft - marginRight;float contentHeight = PageSize.A4.getHeight() - marginTop - marginBottom;float imgWidth = img.getWidth();float imgHeight = img.getHeight();float widthPercent = contentWidth / imgWidth * 100;float heightPercent = contentHeight / imgHeight * 100;img.scalePercent(widthPercent < heightPercent ? widthPercent : heightPercent);// 将图片放入pdfPdfWriter.getInstance(document, os);document.open();document.newPage();document.add(img);} catch (Exception e) {e.printStackTrace();} finally {if (document != null) {document.close();}if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 将图片文件转换为pdf，然后在浏览器中下载* 模拟场景：从本地读取图片文件，然后在浏览器中下载*/@SneakyThrows@GetMapping("/file2pdf")public void file2pdf(HttpServletResponse response) {// 准备数据File file = ResourceUtils.getFile("classpath:中国城市-导图版.jpg");String fileName = "中国城市-导图版";// 公文格式页边距float marginLeft = Math.round(LEFT * CM_2_POUND);float marginRight = Math.round(RIGHT * CM_2_POUND);float marginTop = Math.round(TOP * CM_2_POUND);float marginBottom = Math.round(BOTTOM * CM_2_POUND);Document document = null;OutputStream os = null;try {// 设置response属性os = response.getOutputStream();response.setContentType("application/force-download");try {fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");} catch (UnsupportedEncodingException e) {e.printStackTrace();}response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".pdf");// 设置pdf页面大小document = new Document(PageSize.A4, marginLeft, marginRight, marginTop, marginBottom);document.addTitle(fileName);// 将图片输入流转换成字节数组byte[] bytes = FileUtil.readBytes(file);// 处理图片数据、居中Image img = Image.getInstance(bytes);img.setAlignment(Image.MIDDLE);// 处理图片缩放比率float contentWidth = PageSize.A4.getWidth() - marginLeft - marginRight;float contentHeight = PageSize.A4.getHeight() - marginTop - marginBottom;float imgWidth = img.getWidth();float imgHeight = img.getHeight();float widthPercent = contentWidth / imgWidth * 100;float heightPercent = contentHeight / imgHeight * 100;img.scalePercent(widthPercent < heightPercent ? widthPercent : heightPercent);// 将图片放入pdfPdfWriter.getInstance(document, os);document.open();document.newPage();document.add(img);} catch (Exception e) {e.printStackTrace();} finally {if (document != null) {document.close();}if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 将图片输入流转换为pdf，然后在浏览器中下载* 模拟场景：从任何位置读取出图片输入流，然后在浏览器中下载*/@GetMapping("/stream2pdf")public void stream2pdf(HttpServletResponse response) throws FileNotFoundException {// 准备数据File file = ResourceUtils.getFile("classpath:中国城市-导图版.jpg");String fileName = "中国城市-导图版";// 公文格式页边距float marginLeft = Math.round(LEFT * CM_2_POUND);float marginRight = Math.round(RIGHT * CM_2_POUND);float marginTop = Math.round(TOP * CM_2_POUND);float marginBottom = Math.round(BOTTOM * CM_2_POUND);Document document = null;OutputStream os = null;try (InputStream inputStream = new FileInputStream(file)) {// 设置response属性os = response.getOutputStream();response.setContentType("application/force-download");try {fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");} catch (UnsupportedEncodingException e) {e.printStackTrace();}response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".pdf");// 设置pdf页面大小document = new Document(PageSize.A4, marginLeft, marginRight, marginTop, marginBottom);document.addTitle(fileName);// 将图片输入流转换成字节数组byte[] bytes = toByteArray(inputStream);// 处理图片数据、居中Image img = Image.getInstance(bytes);img.setAlignment(Image.MIDDLE);// 处理图片缩放比率float contentWidth = PageSize.A4.getWidth() - marginLeft - marginRight;float contentHeight = PageSize.A4.getHeight() - marginTop - marginBottom;float imgWidth = img.getWidth();float imgHeight = img.getHeight();float widthPercent = contentWidth / imgWidth * 100;float heightPercent = contentHeight / imgHeight * 100;img.scalePercent(widthPercent < heightPercent ? widthPercent : heightPercent);// 将图片放入pdfPdfWriter.getInstance(document, os);document.open();document.newPage();document.add(img);} catch (Exception e) {e.printStackTrace();} finally {if (document != null) {document.close();}if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 将图片文件转换为pdf，然后在本地下载* 模拟场景：将图片文件或者图片流存储在本地*/@GetMapping("/img2LocalPdf")public String img2LocalPdf() throws FileNotFoundException {// 准备数据；注意：切换成你自己本地的图片File file = ResourceUtils.getFile("classpath:中国城市-导图版.jpg");String fileName = "中国城市-导图版";// 公文格式页边距float marginLeft = Math.round(LEFT * CM_2_POUND);float marginRight = Math.round(RIGHT * CM_2_POUND);float marginTop = Math.round(TOP * CM_2_POUND);float marginBottom = Math.round(BOTTOM * CM_2_POUND);// 创建临时文件File pdf = FileUtil.createTempFile(".pdf", true);Document document = null;OutputStream os = null;try (InputStream inputStream = new FileInputStream(file)) {// 设置response属性os = new FileOutputStream(pdf);// 设置pdf页面大小document = new Document(PageSize.A4, marginLeft, marginRight, marginTop, marginBottom);document.addTitle(fileName);// 将图片输入流转换成字节数组byte[] bytes = toByteArray(inputStream);// 处理图片数据、居中Image img = Image.getInstance(bytes);img.setAlignment(Image.MIDDLE);// 处理图片缩放比率float contentWidth = PageSize.A4.getWidth() - marginLeft - marginRight;float contentHeight = PageSize.A4.getHeight() - marginTop - marginBottom;float imgWidth = img.getWidth();float imgHeight = img.getHeight();float widthPercent = contentWidth / imgWidth * 100;float heightPercent = contentHeight / imgHeight * 100;img.scalePercent(widthPercent < heightPercent ? widthPercent : heightPercent);// 将图片放入pdfPdfWriter.getInstance(document, os);document.open();document.newPage();document.add(img);} catch (Exception e) {e.printStackTrace();} finally {if (document != null) {document.close();}if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}return pdf.getAbsolutePath();}// 将输入流转换成字节数组private static byte[] toByteArray(InputStream input) throws IOException {ByteArrayOutputStream output = new ByteArrayOutputStream();byte[] buffer = new byte[1024 * 4];int n = 0;while (-1 != (n = input.read(buffer))) {output.write(buffer, 0, n);}return output.toByteArray();}
}

三、测试链接

测试下载链接：
1、将base64编码图片字符串转换为pdf，然后在浏览器中下载
链接：http://127.0.0.1:8080/test/base642pdf2、将图片文件转换为pdf，然后在浏览器中下载
链接：http://127.0.0.1:8080/test/file2pdf3、将图片输入流转换为pdf，然后在浏览器中下载
链接：http://127.0.0.1:8080/test/stream2pdf4、将图片文件转换为pdf，然后在本地下载
链接：http://127.0.0.1:8080/test/img2LocalPdf

四、结果展示

在这里插入图片描述

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