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来源：https://blog.csdn.net/sand_clock/category_6862979.html

java生成PDF的几种方法

转x33g5p2x  于2021-12-28 转载在 其他  
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问题场景

总结一下用java生成PDF的方法：
A、itext-PdfStamper pdfStamper（俗称抠模板）
B、itext-Document document（正常代码撰写）
C、wkhtmltopdf（使用工具）

分析比较

方法优点缺点
A代码简单模板要先提供，且字段长度固定、不灵活
B模板可根据代码调整、但样式不如C灵活要维护的后台代码较多
C模板样式可根据前端随意调整要维护的前台代码较多

用到的资源

A/B: itext-pdfa-5.5.6.jar、itext-xtra-5.5.6.jar、itext-5.5.6.jar、itext-asian.jar
C: wkhtmltopdf-0.12.4、python2.7.14、pdfkit

举例：

A：
1、用PDF编辑器编辑好模板，留出空白等待程序填充。
2、程序生成与下载。

  1. /**
  2.      * 抠模板
  3.      * @throws Exception
  4.      */
  5.     public void createAllPdf() throws Exception {
  6.         //填充创建pdf
  7.         PdfReader reader = null;
  8.         PdfStamper stamp = null;
  9.         try {
  10.             reader = new PdfReader("E:/module.pdf");
  11.             SimpleDateFormat simp = new SimpleDateFormat("yyyy-MM-dd");
  12.             String times = simp.format(new Date()).trim();
  13.             //创建生成报告名称
  14.             String root = ServletActionContext.getRequest().getRealPath("/upload") + File.separator;
  15.             if (!new File(root).exists())
  16.                 new File(root).mkdirs();
  17.             File deskFile = new File(root, times + ".pdf");
  18.             stamp = new PdfStamper(reader, new FileOutputStream(deskFile));
  19.             //取出报表模板中的所有字段
  20.             AcroFields form = stamp.getAcroFields();
  21.             // 填充数据
  22.             form.setField("name", "zhangsan");
  23.             form.setField("sex", "男");
  24.             form.setField("age", "15");
  26.             //报告生成日期
  27.             SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd");
  28.             String generationdate = dateformat.format(new Date());
  29.             form.setField("generationdate", generationdate);
  30.             stamp.setFormFlattening(true);
  31.         } catch (Exception e) {
  32.             e.printStackTrace();
  33.         } finally {
  34.             if (stamp != null) {
  35.                 stamp.close();
  36.             }
  37.             if (reader != null) {
  38.                 reader.close();
  39.             }
  40.         }
  41.     }

B:
常用功能推荐列表
ITEXT PDF文件的拆分与合并
ITEXT 表格的指定列合并-升级版
ITEXT 表格的指定列合并
ITEXT 实现背景色交替的三线表
ITEXT 页眉页脚页码三件套
ITEXT 目录生成的第三种方法（同时带有书签功能）
ITEXT-定位PDF中图片的坐标与页码
ITEXT-PDF彩色字体显示-支持中文
ITEXT-插入水印(itext-pdfa-5.5.6.jar)
直接上代码

  1. package itext;
  3. import com.itextpdf.text.*;
  4. import com.itextpdf.text.pdf.*;
  6. import java.io.FileNotFoundException;
  7. import java.io.FileOutputStream;
  9. /**
  10.  * Created on 2017/5/16
  11.  * Author: youxingyang.
  12.  */
  13. public class TableAndTitle {
  14.     /**
  15.      * @param args
  16.      */
  17.     public static void main(String[] args) throws Exception {
  18.         String fileName = "tableAndTitle.pdf";
  19.         TableAndTitle.test(fileName);
  20.     }
  22.     private static void test(String fileName) {
  23.         Document document = new Document();
  24.         try {
  25.             PdfWriter.getInstance(document, new FileOutputStream(fileName));
  26.             document.open();
  28.             PdfPTable table = new PdfPTable(1);
  29.             table.setKeepTogether(true);
  30.             table.setSplitLate(false);
  32.             PdfPTable table1 = new PdfPTable(1);
  33.             PdfPCell cell0 = new PdfPCell();
  34.             Paragraph p = new Paragraph("table title sample");
  35.             p.setAlignment(1);
  36.             p.setSpacingBefore(15f);
  37.             cell0.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);
  38.             cell0.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);//然并卵
  39.             cell0.setPaddingTop(-2f);//把字垂直居中
  40.             cell0.setPaddingBottom(8f);//把字垂直居中
  41.             cell0.addElement(p);
  42.             cell0.setBorder(0);
  43.             table1.addCell(cell0);
  45.             PdfPTable pTable = new PdfPTable(table1);
  46.             document.add(pTable);
  48.             PdfPTable table2 = new PdfPTable(2);
  49.             float border = 1.5f;
  50.             for (int a = 0; a < 20; a++) {
  51.                 PdfPCell cell = new PdfPCell();
  52.                 Paragraph pp;
  53.                 if (a == 0 || a == 1) {
  54.                     pp = str2ParaByTwoFont("tableTitle" + (a + 1), 9f, BaseColor.BLACK, Font.BOLD); //小五 加粗
  55.                     cell.setBorderWidthBottom(border);
  56.                     cell.setBorderWidthTop(border);
  57.                 } else {
  58.                     if (a == 18 || a == 19) {
  59.                         cell.setBorderWidthTop(0);
  60.                         cell.setBorderWidthBottom(border);
  61.                     } else {
  62.                         cell.setBorderWidthBottom(0);
  63.                         cell.setBorderWidthTop(0);
  64.                     }
  65.                     pp = str2ParaByTwoFont("tableContent" + (a - 1), 9f, BaseColor.BLACK); //小五
  66.                 }
  67.                 //设置间隔的背景色
  68.                 if ((a + 1) % 2 == 0) {
  69.                     if (((a + 1) / 2) % 2 == 1) {
  70.                         cell.setBackgroundColor(new BaseColor(128, 128, 255));
  71.                     } else {
  72.                         cell.setBackgroundColor(new BaseColor(128, 255, 255));
  73.                     }
  74.                 } else {
  75.                     if (((a + 1) / 2) % 2 == 1) {
  76.                         cell.setBackgroundColor(new BaseColor(128, 255, 255));
  77.                     } else {
  78.                         cell.setBackgroundColor(new BaseColor(128, 128, 255));
  79.                     }
  80.                 }
  81.                 pp.setAlignment(1);
  82.                 cell.setBorderWidthLeft(0);
  83.                 cell.setBorderWidthRight(0);
  84.                 cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);
  85.                 cell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);//然并卵
  86.                 cell.setPaddingTop(-2f);//把字垂直居中
  87.                 cell.setPaddingBottom(8f);//把字垂直居中
  88.                 cell.addElement(pp);
  89.                 table2.addCell(cell);
  90.             }
  92.             PdfPCell c1 = new PdfPCell();
  93.             c1.setBorder(0);
  94.             c1.addElement(table1);
  96.             PdfPCell c2 = new PdfPCell();
  97.             c2.setBorder(0);
  98.             c2.addElement(table2);
  100.             table.addCell(c1);
  101.             table.addCell(c2);
  103.             document.add(table);
  104.             document.close();
  105.         } catch (DocumentException | FileNotFoundException e) {
  106.             e.printStackTrace();
  107.         }
  108.     }
  110.     /**
  111.      * 两种字体显示文字
  112.      *
  113.      * @param cont
  114.      * @param size
  115.      * @param color
  116.      * @return
  117.      */
  118.     private static Paragraph str2ParaByTwoFont(String cont, float size, BaseColor color) {
  119.         Paragraph res = new Paragraph();
  120.         FontSelector selector = new FontSelector();
  121.         //非汉字字体颜色
  122.         Font f1 = FontFactory.getFont(FontFactory.TIMES_ROMAN, size);
  123.         f1.setColor(color);
  124.         //汉字字体颜色
  125.         Font f2 = FontFactory.getFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED, size);
  126.         f2.setColor(color);
  128.         selector.addFont(f1);
  129.         selector.addFont(f2);
  130.         Phrase ph = selector.process(cont);
  131.         res.add(ph);
  132.         return res;
  133.     }
  135.     /**
  136.      * 两种字体显示文字
  137.      *
  138.      * @param cont
  139.      * @param size
  140.      * @param color
  141.      * @param bold
  142.      * @return
  143.      */
  144.     private static Paragraph str2ParaByTwoFont(String cont, float size, BaseColor color, int bold) {
  146.         Paragraph res = new Paragraph();
  147.         FontSelector selector = new FontSelector();
  148.         //非汉字字体颜色
  149.         Font f1 = FontFactory.getFont(FontFactory.TIMES_ROMAN, size);
  150.         f1.setColor(color);
  151.         f1.setStyle(bold);
  152.         //汉字字体颜色
  153.         Font f2 = FontFactory.getFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED, size);
  154.         f2.setColor(color);
  155.         f2.setStyle(bold);
  157.         selector.addFont(f1);
  158.         selector.addFont(f2);
  159.         Phrase ph = selector.process(cont);
  160.         res.add(ph);
  161.         return res;
  162.     }
  163. }

C:
总思路：java调用python脚本，python下多线程调用了pdfkit（pdfkit 是 wkhtmltopdf 的Python封装包）

CODE: 里面有的简单方法未提供源码，自己写
1、java代码

  1. /**
  2.      * 多线程生成报告
  3.      * @param map           样本及公司对应集合
  4.      * @param productMap    样本及产品对应集合
  5.      * @param sampleList    样本列表集合
  6.      * @param storeDir      报告存储路径
  7.      * @param url           源转换的页面url前缀
  8.      * @param pyPre         python脚本存放的位置
  9.      * @param uuid          本地任务唯一标识
  10.      * @param storePrefix   url参数文件前缀
  11.      * @return
  12.      */
  13.     private static int createMul(Map<String, String> map, Map<String, String> productMap,
  14.                                  List<String> sampleList, String storeDir, String url, String pyPre, String uuid, String storePrefix) {
  15.         String date = DateUtil.date2Str(new Date());
  16.         StringBuilder pathTemp = new StringBuilder("");
  17.         String companyId;
  18.         String productCode;
  19.         String cmd;
  20.         int sum = 0;
  21.         Map<String, String> sampleMap = new LinkedHashMap<>(sampleList.size());
  22.         String paraFileName;
  23.         try {
  24.             String path;
  25.             for (String sampleCode : sampleList) {
  26.                 companyId = map.get(sampleCode);
  27.                 productCode = productMap.get(sampleCode);
  28.                 pathTemp.append(storeDir).append(date).append("-").append(uuid).append(File.separator).append(companyId).append(File.separator).append(productCode);
  29.                 path = pathTemp.toString();
  30.                 pathTemp.setLength(0);
  31.                 File file = new File(path);
  32.                 if (!file.exists()) {
  33.                     file.mkdirs();
  34.                 }
  35.                 path += File.separator + sampleCode + "-" + productCode + ".pdf";
  36.                 path = path.replace("\\", "/");
  37.                 sampleMap.put(sampleCode, path);
  38.             }
  39.             paraFileName = storePrefix + DateUtil.date2Str(new Date()) + "-" + EncryUtil.getUUID() + ".txt";
  40.             boolean success = writeMapFile(sampleMap, paraFileName);
  41.             if (success) {
  42.                 log.info("多线程生成报告参数: url: {}, paraFileName: {}", url, paraFileName);
  43.                 cmd = "python " + pyPre + "mul_queue.py -u " + url + " -f " + paraFileName;
  44.                 Process pr = Runtime.getRuntime().exec(cmd);
  45.                 BufferedReader in = new BufferedReader(new InputStreamReader(pr.getInputStream()));
  46.                 String result = null;
  47.                 String line;
  48.                 while ((line = in.readLine()) != null) {
  49.                     result = line;
  50.                     System.out.println("creating: " + result);
  51.                     log.info("creating: {}", result);
  52.                 }
  53.                 if (result != null && result.contains("completed:")) {
  54.                     sum = Integer.parseInt(result.split(":")[1]);
  55.                 }
  56.                 in.close();
  57.                 pr.waitFor();
  58.             }
  59.         } catch (Exception e) {
  60.             e.printStackTrace();
  61.             log.info("多线程生成报告出错: {} ", e.getMessage());
  62.         }
  63.         return sum;
  64.     }
  66.     /**
  67.      * map写进文件里
  68.      * // a = {'a': 'hangge', 'b': 'man', 'school': 'wust'}
  69.      * @param sampleMap
  70.      * @param paraFileName
  71.      * @return
  72.      */
  73.     public static boolean writeMapFile(Map<String, String> sampleMap, String paraFileName) {
  74.         boolean res = false;
  75.         BufferedWriter bw = null;
  76.         try {
  77.             File file = new File(paraFileName);
  78.             if (!file.exists()) {
  79.                 CommonUtil.createFile(paraFileName);
  80.             }
  81.             bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(paraFileName)));
  82.             if (sampleMap.size() > 0) {
  83.                 bw.write('{');
  84.                 int index = 0;
  85.                 for (String key : sampleMap.keySet()) {
  86.                     bw.write('\'');
  87.                     bw.write(key);
  88.                     bw.write('\'');
  89.                     bw.write(':');
  90.                     bw.write('\'');
  91.                     bw.write(sampleMap.get(key));
  92.                     bw.write('\'');
  93.                     if (index < sampleMap.size() - 1) {
  94.                         bw.write(',');
  95.                     }
  96.                     index++;
  97.                 }
  98.                 bw.write('}');
  99.                 res = true;
  100.             }
  101.         } catch (Exception e) {
  102.             e.printStackTrace();
  103.         }try {
  104.             if (bw != null) {
  105.                 bw.close();
  106.             }
  107.         } catch (IOException e) {
  108.             e.printStackTrace();
  109.         }
  110.         return res;
  111.     }

2、python脚本

  1. import threading
  2. import ast
  3. from Queue import Queue
  5. import pdfkit
  6. import sys
  7. import getopt
  8. import codecs
  10. class MyThread(threading.Thread):
  11.     def __init__(self, q):
  12.         super(MyThread, self).__init__()
  13.         self.q = q
  15.     def run(self):
  16.         while True:
  17.             url_path = self.q.get()
  18.             url_in = url_path[0]
  19.             path = url_path[1]
  20.             createpdf(url=url_in, path=path)
  21.             self.q.task_done()
  23. def createpdf(url, path):
  24.     options = {
  25.         'margin-top': '0in',
  26.         'margin-right': '0in',
  27.         'margin-bottom': '0in',
  28.         'margin-left': '0in',
  29.         'encoding': "UTF-8",
  30.         'javascript-delay': '200000',
  31.     }
  32.     num = 0
  33.     compete = pdfkit.from_url(url, path, options=options)
  34.     if compete:
  35.         num = 1
  37.     return num
  39. if __name__ == '__main__':
  40.     parameterList = sys.argv[1:]
  41.     url = ''
  42.     file_name = ''
  43.     opts, args = getopt.getopt(parameterList, "u:f:", ['url=', 'file_name='])
  44.     for opt, arg in opts:
  45.         if opt in ("-u", "--url"):
  46.             url = arg
  47.         elif opt in ("-f", "--file_name"):
  48.             file_name = arg
  50.     # print('url:', url)
  51.     # print('file_name:', file_name)
  53.     sample_map = {}
  54.     f = codecs.open(filename=file_name, mode="r+", encoding='utf-8')
  55.     lines = f.readlines()
  56.     sample_map_string = ''
  57.     for line in lines:
  58.         sample_map_string = line
  59.         break
  61.     sample_map = ast.literal_eval(sample_map_string)
  63.     queue = Queue()
  64.     size = len(sample_map)
  65.     stable_num = 5
  66.     if size > stable_num:
  67.         size = stable_num
  69.     for x in range(size):
  70.         worker = MyThread(queue)
  71.         worker.daemon = True
  72.         worker.start()
  74.     for i in sample_map.keys():
  75.         url_path_list = [url + '?sample_sn=%s' % i, sample_map.get(i)]
  76.         queue.put(url_path_list)
  78.     queue.join()
  80.     print "completed:" + bytes(len(sample_map))

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原文链接 : https://blog.csdn.net/sand_clock/article/details/85328849

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