本篇文章为大家展示了Java中怎么通过模板生成PDF，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
1、添加maven依赖
<dependency> <groupId>com.itextpdf</groupId> <artifactId>itextpdf</artifactId> <version>5.5.13.1</version> </dependency> <dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox</artifactId> <version>2.0.16</version> </dependency>
2.1、通过模板生成PDF文件
package com.hlwl.common.util;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import org.apache.commons.lang3.RandomUtils;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* PDF工具类
* @class com.hlwl.common.util.PdfUtil.java
* @author happyran
* @since 2019-09-09 09:09
*/
public class PdfUtil {
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
/**
* 根据模板生成PDF
* @param tempPdfPath
* @param data
*/
public static void createPdf(String tempPdfPath, Map<String, Object> data){
//填充创建pdf
PdfReader reader = null;
PdfStamper stamp = null;
try {
//创建生成报告名称
if (!new File(tempPdfPath).exists()) {
new File(tempPdfPath).mkdirs();
}
File deskFile = new File(tempPdfPath, sdf.format(new Date()) + RandomUtils.nextInt(1000,9999) + ".pdf");
reader = new PdfReader("D:\\pdfTest\\a.pdf");
stamp = new PdfStamper(reader, new FileOutputStream(deskFile));
// 取出报表模板中的所有字段
AcroFields form = stamp.getAcroFields();
BaseFont bf = BaseFont.createFont("c://windows//fonts//simsun.ttc,1" , BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
form.addSubstitutionFont(bf);
// 填充数据
form.setField("name", data.get("name").toString());
form.setField("sex", data.get("sex").toString());
form.setField("age", data.get("age").toString());
form.setField("generationdate", data.get("generationdate").toString()); //报告生成日期
stamp.setFormFlattening(true);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (stamp != null) {
try {
stamp.close();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
if (reader != null) {
reader.close();
}
}
}
// 利用模板生成pdf
public static void pdfout(Map<String,Object> o) {
// 模板路径
String templatePath = "d:/pdfTest/b.pdf";
// 生成的新文件路径
String newPDFPath = "d:/pdfTest/b" + sdf.format(new Date()) + ".pdf";
PdfReader reader;
FileOutputStream out;
ByteArrayOutputStream bos;
PdfStamper stamper;
try {
BaseFont bf = BaseFont.createFont("c://windows//fonts//simsun.ttc,1" , BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font FontChinese = new Font(bf, 5, Font.NORMAL);
out = new FileOutputStream(newPDFPath);// 输出流
reader = new PdfReader(templatePath);// 读取pdf模板
bos = new ByteArrayOutputStream();
stamper = new PdfStamper(reader, bos);
AcroFields form = stamper.getAcroFields();
// 文字类的内容处理
Map<String,String> datemap = (Map<String,String>)o.get("datemap");
form.addSubstitutionFont(bf);
for(String key : datemap.keySet()){
form.setField(key,datemap.get(key));
}
// 图片类的内容处理
Map<String,String> imgmap = (Map<String,String>)o.get("imgmap");
for(String key : imgmap.keySet()) {
int pageNo = form.getFieldPositions(key).get(0).page;
Rectangle signRect = form.getFieldPositions(key).get(0).position;
float x = signRect.getLeft();
float y = signRect.getBottom();
//根据路径读取图片
Image image = Image.getInstance(imgmap.get(key));
//获取图片页面
PdfContentByte under = stamper.getOverContent(pageNo);
//图片大小自适应
image.scaleToFit(signRect.getWidth(), signRect.getHeight());
//添加图片
image.setAbsolutePosition(x, y);
under.addImage(image);
}
stamper.setFormFlattening(true);// 如果为false，生成的PDF文件可以编辑，如果为true，生成的PDF文件不可以编辑
stamper.close();
Document doc = new Document();
Font font = new Font(bf, 32);
PdfCopy copy = new PdfCopy(doc, out);
doc.open();
PdfImportedPage importPage = copy.getImportedPage(new PdfReader(bos.toByteArray()), 1);
copy.addPage(importPage);
doc.close();
} catch (IOException e) {
System.out.println(e);
} catch (DocumentException e) {
System.out.println(e);
}
}
public static void main(String[] args) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Map<String, Object> data = new HashMap<>();
data.put("name","zhangsan");
data.put("sex","男");
data.put("age","15");
data.put("generationdate",sdf.format(new Date()));
createPdf("D:\\pdfTest\\",data);
// Map<String,String> map = new HashMap();
// map.put("name","张三");
// map.put("creatdate","2018年1月1日");
// map.put("weather","晴朗");
// map.put("sports","打羽毛球");
//
// Map<String,String> map2 = new HashMap();
// map2.put("img","D:\\pdfTest\\1.jpg");
//
// Map<String,Object> o=new HashMap();
// o.put("datemap",map);
// o.put("imgmap",map2);
// pdfout(o);
}
}2.2、将PDF转为图片
package com.hlwl.common.util;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
/**
* PDF转图片工具类
* @class com.hlwl.common.util.Pdf2ImgUtil.java
* @author happyran
* @since 2019-09-09 09:09
*/
public class Pdf2ImgUtil {
//可自由确定起始页和终止页
public static void pdf2png(String fileAddress,String filename,int indexOfStart,int indexOfEnd) {
// 将pdf装图片 并且自定义图片得格式大小
File file = new File(fileAddress+"\\"+filename+".pdf");
try {
PDDocument doc = PDDocument.load(file);
PDFRenderer renderer = new PDFRenderer(doc);
int pageCount = doc.getNumberOfPages();
for (int i = indexOfStart; i < indexOfEnd; i++) {
BufferedImage image = renderer.renderImageWithDPI(i, 144); // Windows native DPI
// BufferedImage srcImage = resize(image, 240, 240);//产生缩略图
ImageIO.write(image, "PNG", new File(fileAddress+"\\"+filename+"_"+(i+1)+".png"));
}
} catch (IOException e) {
e.printStackTrace();
}
}
//转换全部的pdf
public static void pdf2png(String fileAddress,String filename) {
// 将pdf装图片 并且自定义图片得格式大小
File file = new File(fileAddress+"\\"+filename+".pdf");
try {
PDDocument doc = PDDocument.load(file);
PDFRenderer renderer = new PDFRenderer(doc);
int pageCount = doc.getNumberOfPages();
for (int i = 0; i < pageCount; i++) {
BufferedImage image = renderer.renderImageWithDPI(i, 144); // Windows native DPI
// BufferedImage srcImage = resize(image, 240, 240);//产生缩略图
ImageIO.write(image, "PNG", new File(fileAddress+"\\"+filename+"_"+(i+1)+".png"));
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入需要转换的pdf的地址，例如 E:\\软件\\代码：");
String fileAddress = sc.nextLine();
System.out.println("请输入需要转换的pdf的名称，不要加.pdf后缀，例如 操作系统概念：");
String filename =sc.nextLine();
System.out.println("请输入开始转换的页码，从0开始，例如 5：");
int indexOfStart=sc.nextInt();
System.out.println("请输入停止转换的页码，-1为全部，例如 10：");
int indexOfEnd=sc.nextInt();
if (indexOfEnd==-1) {
pdf2png(fileAddress, filename);
}
else {
pdf2png(fileAddress, filename, indexOfStart, indexOfEnd);
}
}
}上述内容就是Java中怎么通过模板生成PDF，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
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