基于itext7导出pdf实现，支持水印、中文等【小峰分享】

public class ExportReportPdfUtil {

static PdfFont helvetica = null;
static PdfFont helveticaBold = null;
static DecimalFormat df = new DecimalFormat("#0.00");

/**
* @Title: exportPdf
* @Description: 生成pdf，提示下载
* @param fileName 标婷
* @param spreadhead
* @param subhead
* @param tables
* @param response
*/
public static void exportPdf(String fileName,String spreadhead, String subhead, List<PDFTable> tables, HttpServletResponse response){
try{
// 设置response参数，可以打开下载页面
response.reset();
response.setContentType("application/pdf;charset=utf-8");
response.addHeader("Content-Disposition","attachment;filename="+ new String( fileName.getBytes("gb2312"), "ISO8859-1"));
//处理中文问题
helvetica = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
helveticaBold = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
PdfWriter writer = new PdfWriter(response.getOutputStream());
//Initialize PDF document
PdfDocument pdf = new PdfDocument(writer);
pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new ReportEventHandler());
// Initialize document
Document document = new Document(pdf);
//加载报告内容
loadReport(spreadhead, subhead, tables, document);
document.close();
writer.close();
pdf.close();
}catch(Exception e){
e.printStackTrace();
}

}

public static void loadReport(String spreadhead, String subhead, List<PDFTable> tables, Document document){
//大标题
Paragraph p = new Paragraph(spreadhead).setTextAlignment(TextAlignment.CENTER).setFont(helveticaBold).setFontSize(14);
document.add(p);
//副标题
document.add(new Paragraph(subhead).setFont(helvetica).setFontSize(8));
//初始化详情内容
for (PDFTable pdfTable : tables) {
loadTitle(pdfTable.getTitle() , document);
Table table = new Table(pdfTable.getNumColumns());
table.setWidthPercent(pdfTable.getWidthPercent());
List<PDFColumn> columns = pdfTable.getColumns();
for (PDFColumn pdfColumn : columns) {
if(pdfColumn.isBold){
process(table, pdfColumn.getText() , helveticaBold, pdfColumn.isHeader());
}else{
process(table, pdfColumn.getText() , helvetica, pdfColumn.isHeader());
}
}
document.add(table);
}

}

/***
* @Title: title
* @Description: 添加标题
* @param text
* @param document
*/
public static void loadTitle(String text, Document document){
document.add(new Paragraph(text).setFont(helvetica).setBold().setFontSize(12));
}

/**
* @Title: process
* @Description: 处理table
* @param table
* @param text
* @param font
* @param isHeader
*/
public static void process(Table table, String text, PdfFont font, boolean isHeader) {
if (isHeader) {
table.addHeaderCell(new Cell().add(new Paragraph(text).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)).setBold());
} else {
table.addCell(new Cell().add(new Paragraph(text).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
}
}
}