Java使用itext5实现PDF表格文档导出

<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
  <dependency>
   <groupId>com.itextpdf</groupId>
   <artifactId>itextpdf</artifactId>
   <version>5.5.13.1</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian -->
  <dependency>
   <groupId>com.itextpdf</groupId>
   <artifactId>itext-asian</artifactId>
   <version>5.2.0</version>
  </dependency>

//   1.打开文档并设置基本属性
   Document document = new Document();
//   2.设置请求头，encode文件名
   response.setContentType("application/pdf;charset=UTF-8");
   response.setHeader("Content-Disposition", 
   "attachment; filename=" + java.net.URLEncoder.encode("" + 
   recordDto.getTitle() + ".pdf", "UTF-8"));
//   3.通过流将pdf实例写出到浏览器
   PdfWriter writer = PdfWriter.getInstance(document, response.getOutputStream());
 

//    这里的wirter就是上文的writer
   writer.setViewerPreferences(PdfWriter.PageModeUseThumbs);
   writer.setPageSize(PageSize.A4);
 

public static Font getPdfChineseFont() throws Exception {
  BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H",
    BaseFont.NOT_EMBEDDED);
  Font fontChinese = new Font(bfChinese, 12, Font.NORMAL);
  fontChinese.setColor(BaseColor.BLACK);
  fontChinese.setSize(11);
  return fontChinese;
 }
 

// 首先打开文档
document.open();
// 向文档中添加表格数据
private static void printBasicInfo(ShopApplyRecordDto recordDto, Document document, Font font) throws DocumentException {
// 表格中的数据
  Object[][] basicDatas = {
    {"标题","xxx申请", "审批编号","1234"},
    {"申请人","小明", "申请商铺","xxx商场"},
    {"申请日期","2020/1/16", "审批结果","同意")}};
// 每个cell的宽度
  float[] widthss = {50, 200, 50, 200};
//   创建一个表格，每一行有四个cell
  PdfPTable basicTable = new PdfPTable(widthss);
// 外层循环表格的行
  for (int i = 0; i < basicDatas.length; i++) {
// 内层循环每一行具体数据
   for (int j = 0; j < basicDatas[i].length; j++) {
//   新建一个cell
    PdfPCell cell = new PdfPCell();
// 这个方法是统一设置表格和cell的样式，下面会写 
    setTableStyle(basicTable, cell);
// cell中需要填充数据的格式
    Paragraph paragraph = 
    new Paragraph(StrUtil.toString(basicDatas[i][j]), font);
// 设置cell的值
    cell.setPhrase(paragraph);
// 将cell添加到表格中
    basicTable.addCell(cell);
   }
  }
// 将表格添加到文档中
  document.add(basicTable);
 }
// 结束时要关闭文档
document.close();
 

public static void setTableStyle(PdfPTable table, PdfPCell cell) {
// 设置表格样式
  table.setLockedWidth(true);
  table.setTotalWidth(500);
  table.setHorizontalAlignment(Element.ALIGN_LEFT);
// 设置单元格样式
  cell.setMinimumHeight(35);
  cell.setHorizontalAlignment(Element.ALIGN_CENTER);
  cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
  cell.setBackgroundColor(BaseColor.WHITE);
  cell.setBorder(0);
  cell.setBorderWidthTop(0.1f);
  cell.setBorderWidthBottom(0.1f);
  cell.setBorderWidthLeft(0.1f);
  cell.setBorderWidthRight(0.1f);
  cell.setBorderColorBottom(BaseColor.BLACK);
  cell.setBorderColorLeft(BaseColor.BLACK);
  cell.setBorderColorRight(BaseColor.BLACK);
  cell.setBorderColorTop(BaseColor.BLACK);
  cell.setPadding(3);
 }
 

public class HeaderFooter extends PdfPageEventHelper {
// 这里是业务相关的属性可以无视
 private ShopApplyRecordDto recordDto;
 private SysUserInfo userInfo;
// 大部分情况下页眉的值是动态的，这里可以在初始化的时候进行参数传递
 public HeaderFooter(ShopApplyRecordDto recordDto, SysUserInfo userInfo) {
  this.recordDto = recordDto;
  this.userInfo = userInfo;
 }

 public HeaderFooter() {
 }

 public ShopApplyRecordDto getRecordDto() {
  return recordDto;
 }

 public void setRecordDto(ShopApplyRecordDto recordDto) {
  this.recordDto = recordDto;
 }

 public SysUserInfo getUserInfo() {
  return userInfo;
 }

 public void setUserInfo(SysUserInfo userInfo) {
  this.userInfo = userInfo;
 }
// 这个方法就是实现页眉和页码的关键：它的含义是每当页面结束会执行该方法
 @Override
 public void onEndPage(PdfWriter writer, Document document) {
  Font font = null;
  try {
   font = getPdfChineseFont();
  } catch (Exception e) {
   e.printStackTrace();
  }
  SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd HH:mm");
// 设置页眉：这里图省事就用空格来实现左中右三个位置的页眉，其实可以写三个，通过Element.ALIGN_LEFT来控制页眉的位置，document.left()/document.top()这两个可以设置页眉具体位置类似于html的上下调整，大家可以多试试
  ColumnText.showTextAligned(writer.getDirectContent(), 
  Element.ALIGN_LEFT,
  new Phrase("所属项目：" + recordDto.getMallName() + "             打印时间：" + format.format(new Date()) + "         打印人：" + userInfo.getUserName(), font),
  document.left(),
  document.top() + 3, 0);
// 获得一个名为“art”的盒子 
  Rectangle rect = writer.getBoxSize("art");
// 设置页码：这里的页码位置已经设置好，大家可直接使用，至于1/20这种效果的页码实现则十分复杂，如有需求请自行百度/谷歌
  ColumnText.showTextAligned(writer.getDirectContent(),
  Element.ALIGN_CENTER, 
  new Phrase(String.format("%d", writer.getPageNumber())),
  (rect.getLeft() + rect.getRight()) / 2, 
  rect.getBottom() - 18, 0);
 }

 public static Font getPdfChineseFont() throws Exception {
  BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H",
    BaseFont.NOT_EMBEDDED);
  Font fontChinese = new Font(bfChinese, 12, Font.NORMAL);
  fontChinese.setColor(BaseColor.BLACK);
  fontChinese.setSize(11);
  return fontChinese;
 }
}
 
接下来就很简单了，将我们的HeaderFooter设置给PdfWriter对象即可：

// 新建HeaderFooter并传递需要的参数
HeaderFooter headerFooter = new HeaderFooter(recordDto, userInfo);
// 新建一个盒子
Rectangle rect = new Rectangle(36, 54, 559, 788);
// 设置名称为“art”,上面get的就是这个盒子了
writer.setBoxSize("art", rect);
writer.setPageEvent(headerFooter);
// 这个可以设置内容的margin
document.setMargins(45f, 45f, 65f, 50f);