java生成pdf表格,調(diào)用itext創(chuàng)建的實(shí)例

更新時(shí)間：2021年01月30日 11:14:30 作者：不是不夠格

這篇文章主要介紹了java生成pdf表格，調(diào)用itext創(chuàng)建的實(shí)例，具有很好的參考價(jià)值，希望對大家有所幫助。一起跟隨小編過來看看吧

昨天花了很長的時(shí)間去找pdf生成表格的代碼，發(fā)現(xiàn)網(wǎng)上大家寫的代碼太多了，而且又沒有注釋，讓我一個(gè)小白是完全看不懂，這就很過分了，所以秉著我們代碼界共享的原則，我要把我昨天的收獲分享給大家，好了廢話不多說，貼代碼了。

1.第一步導(dǎo)包

 <dependency>
   <groupId>com.itextpdf</groupId>
   <artifactId>itext-asian</artifactId>
   <version>5.2.0</version>
  </dependency>
  <dependency>
   <groupId>com.itextpdf</groupId>
   <artifactId>itextpdf</artifactId>
   <version>5.4.3</version>
  </dependency>

2.第二步看代碼

 
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List; 
public class PDFXXX { 
 public static void main(String[] args) throws Exception, DocumentException {
  List<String> ponum = new ArrayList<String>();
  add(ponum, 26);
  List<String> line = new ArrayList<String>();
  add(line, 26);
  List<String> part = new ArrayList<String>();
  add(part, 26);
  List<String> description = new ArrayList<String>();
  add(description, 26);
  List<String> origin = new ArrayList<String>();
  add(origin, 26);
 
  //Create Document Instance
  Document document = new Document();
 
  //add Chinese font
  BaseFont bfChinese = BaseFont.createFont("d:\\pdf\\simhei.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
 
  //Font headfont=new Font(bfChinese,10,Font.BOLD);
  Font keyfont = new Font(bfChinese, 8, Font.BOLD);
  Font textfont = new Font(bfChinese, 8, Font.NORMAL);
 
  //Create Writer associated with document
  PdfWriter.getInstance(document, new FileOutputStream(new File("D:\\POReceiveReport.pdf")));
 
  document.open(); 
  //Seperate Page controller
  int recordPerPage = 10;
  int fullPageRequired = ponum.size() / recordPerPage;
  int remainPage = ponum.size() % recordPerPage > 1 ? 1 : 0;
  int totalPage = 1;
 
  for (int j = 0; j < totalPage; j++) {
   document.newPage(); 
   String company = "等待";
   //record header field
   PdfPTable t = new PdfPTable(5);
   float[] widths = {1.5f, 1f, 1f, 1.5f, 1f};
   t.setWidths(widths);
   t.setTotalWidth(100);
   t.getDefaultCell().setBorder(PdfPCell.NO_BORDER);
   PdfPCell c1 = new PdfPCell(new Paragraph("PO#", keyfont));
   t.addCell(c1);
   c1 = new PdfPCell(new Paragraph("Line", keyfont));
   t.addCell(c1);
   c1 = new PdfPCell(new Paragraph("Part#", keyfont));
   t.addCell(c1);
   c1 = new PdfPCell(new Paragraph("Description", keyfont));
   t.addCell(c1);
   c1 = new PdfPCell(new Paragraph("Origin", keyfont));
   t.addCell(c1);
 
   //calculate the real records within a page ,to calculate the last record number of every page
   int maxRecordInPage = j + 1 == totalPage ? (remainPage == 0 ? recordPerPage : (ponum.size() % recordPerPage)) : recordPerPage;
 
   for (int i = j * recordPerPage; i < ((j * recordPerPage) + maxRecordInPage); i++) {
    PdfPCell c2 = new PdfPCell(new Paragraph(ponum.get(i), textfont));
    t.addCell(c2);
    c2 = new PdfPCell(new Paragraph(line.get(i), textfont));
    t.addCell(c2);
    c2 = new PdfPCell(new Paragraph(part.get(i), textfont));
    t.addCell(c2);
    c2 = new PdfPCell(new Paragraph(description.get(i), textfont));
    t.addCell(c2);
    c2 = new PdfPCell(new Paragraph(origin.get(i), textfont));
    t.addCell(c2);
   }
   document.add(t); 
  }
  document.close();
 }
 
 public static String leftPad(String str, int i) {
  int addSpaceNo = i - str.length();
  String space = "";
  for (int k = 0; k < addSpaceNo; k++) {
   space = " " + space;
  }
  ;
  String result = space + str;
  return result;
 }
 
 public static String printBlank(int tmp) {
  String space = "";
  for (int m = 0; m < tmp; m++) {
   space = space + " ";
  }
  return space;
 }
 
 public static void add(List<String> list, int num) {
  for (int i = 0; i < num; i++) {
   list.add("test老葛-" + i);
  }
 } 
}

3.注意事項(xiàng)：

simhei.ttf 這是字體，對中文有效的；然后如果導(dǎo)了com.lowagie包可能在引包的時(shí)候會出現(xiàn)問題，所以看我代碼上的import導(dǎo)的什么包就行了。

補(bǔ)充：java生成PDF表格的一次優(yōu)化

在優(yōu)化一個(gè)pdf的發(fā)票打印的時(shí)候如果發(fā)票的發(fā)票明細(xì)超過1000行的時(shí)候就會變得很慢.需要20分鐘才能把數(shù)據(jù)加載出來.之后就開始查詢耗時(shí)的原因,在打印了每個(gè)方法的執(zhí)行時(shí)間之后,發(fā)現(xiàn)在打印方法執(zhí)行的時(shí)候sql取數(shù)據(jù)的時(shí)候很快,那么就是itext的轉(zhuǎn)換PDF的時(shí)候?qū)е潞苈?

最后找到原因是因?yàn)榘l(fā)票明細(xì)行中的行合并導(dǎo)致效率低下,比如一個(gè)合同下有1000條明細(xì)數(shù)據(jù),那么合同名稱這一列就需要合同1000行,這個(gè)合并會導(dǎo)致打印效率低下(cell.setColspan(colspan);)方法;