java后台导出pdf，基础用法和样例

1.首先添加依赖

      <dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.10</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency>

2.最基础的用法为：

     // 1.新建document对象Document document = new Document();// 2.建立一个书写器(Writer)与document对象关联，通过书写器(Writer)可以将文档写入到磁盘中。// 创建 PdfWriter 对象 第一个参数是对文档对象的引用，第二个参数是文件的实际名称，在该名称中还会给出其输出路径。PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("D:/test.pdf"));Anchor anchorTarget = new Anchor("ccccccccccccccccc");anchorTarget.setName("bbbbbbbbbbbbbbbb");Paragraph paragraph1 = new Paragraph();paragraph1.setSpacingBefore(50);paragraph1.add(anchorTarget);document.add(paragraph1);// 3.打开文档document.open();// 4.添加一个内容段落document.add(new Paragraph("Hello World!"));// 5.关闭文档document.close();

3.我曾经写过的一个项目中的例子（最后有效果图）：

Map resultMap = new HashMap();resultMap.put("RWBH",rwbh);Map rwList = mybatisRepository.selectOne(this.namespace + "queryRwxx", resultMap);List<Map> ldList = mybatisRepository.selectByParams(this.namespace + "queryLdxx", resultMap);// 定义全局的字体静态变量Font titlefont;Font headfont;Font keyfont;Font textfont = null;// 最大宽度try {// 不同字体（这里定义为同一种字体：包含不同字号、不同style）BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);titlefont = new Font(bfChinese, 16, Font.BOLD);headfont = new Font(bfChinese, 14, Font.BOLD);keyfont = new Font(bfChinese, 10, Font.BOLD);textfont = new Font(bfChinese, 15, Font.NORMAL);} catch (Exception e) {e.printStackTrace();}BaseFont bf;Font font = null;try {bf = BaseFont.createFont( "STSong-Light", "UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);//创建字体font = new Font(bf,20,Font.BOLD);//使用字体} catch (Exception e) {e.printStackTrace();}Document document = new Document(new RectangleReadOnly(842F, 595F));try {String filePath="E:/file/dzld/"+rwbh+".pdf";PdfWriter.getInstance(document, new FileOutputStream(filePath));document.open();Paragraph paragraph=new Paragraph("运输服务路单汇总表",font);paragraph.setAlignment(1);document.add(paragraph);//引用字体float[] widths = {25f,25f,25f,25f,25f,25f,25f,25f};// 设置表格的列宽和列数 默认是4列PdfPTable table = new PdfPTable(widths);// 建立一个pdf表格table.setSpacingBefore(20f);table.setWidthPercentage(100);// 设置表格宽度为100%PdfPCell cell = null;//第一行cell = new PdfPCell(new Paragraph("优选编号",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setFixedHeight(50);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("RWBH")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);cell = new PdfPCell(new Paragraph("任务名称",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("RWMC")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);//第2行cell = new PdfPCell(new Paragraph("车牌号",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setFixedHeight(50);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("CPH")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);cell = new PdfPCell(new Paragraph("车型",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("CXMC")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);//第3行cell = new PdfPCell(new Paragraph("用车单位",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setFixedHeight(50);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("FQDWMC")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);cell = new PdfPCell(new Paragraph("派车单位",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("JDDWMC")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);//第4行cell = new PdfPCell(new Paragraph("起止时间",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setFixedHeight(50);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("ZZKGSJ"))+"至"+StringUtil.null2blank(rwList.get("ZWWGSJ")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setColspan(3);table.addCell(cell);cell = new PdfPCell(new Paragraph("总工作量",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("ZGZL")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("总运费",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph(StringUtil.null2blank(rwList.get("ZYF")),textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);//第5行cell = new PdfPCell(new Paragraph("开始时间",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setFixedHeight(50);table.addCell(cell);cell = new PdfPCell(new Paragraph("结束时间",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("工作量",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("单价",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("运费(元)",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("桥路费(元)",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("甲方现场人员",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);cell = new PdfPCell(new Paragraph("路单复核人",textfont));//cell.setVerticalAlignment(cell.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell);String LKGSJ="";String LWGSJ="";String GZL="";String DJ="";String YF="";String QLF="";String JFXCRY="";String FHRMC="";if (ldList.size()>0){for (int i = 0; i <ldList.size(); i++) {LKGSJ=StringUtil.null2blank(ldList.get(i).get("LKGSJ"));LWGSJ=StringUtil.null2blank(ldList.get(i).get("LWGSJ"));GZL=StringUtil.null2blank(ldList.get(i).get("FHGZL"));DJ=StringUtil.null2blank(ldList.get(i).get("FHDJ"));YF=StringUtil.null2blank(ldList.get(i).get("FHYF"));QLF=StringUtil.null2blank(ldList.get(i).get("FHQLF"));JFXCRY=StringUtil.null2blank(ldList.get(i).get("JFXCRY"));;FHRMC=StringUtil.null2blank(ldList.get(i).get("FHRMC"));//设置编号单元格PdfPCell cell11=new PdfPCell(new Paragraph(LKGSJ,textfont));PdfPCell cell22=new PdfPCell(new Paragraph(LWGSJ,textfont));PdfPCell cell33=new PdfPCell(new Paragraph(GZL,textfont));PdfPCell cell44=new PdfPCell(new Paragraph(DJ,textfont));PdfPCell cell55=new PdfPCell(new Paragraph(YF,textfont));PdfPCell cell66=new PdfPCell(new Paragraph(QLF,textfont));PdfPCell cell77=new PdfPCell(new Paragraph(JFXCRY,textfont));PdfPCell cell88=new PdfPCell(new Paragraph(FHRMC,textfont));//单元格水平对齐方式cell11.setHorizontalAlignment(Element.ALIGN_CENTER);cell11.setVerticalAlignment(cell.ALIGN_MIDDLE);cell11.setFixedHeight(50);//单元格垂直对齐方式cell22.setHorizontalAlignment(Element.ALIGN_CENTER);cell22.setVerticalAlignment(Element.ALIGN_CENTER);cell22.setVerticalAlignment(cell.ALIGN_MIDDLE);cell33.setHorizontalAlignment(Element.ALIGN_CENTER);cell33.setVerticalAlignment(Element.ALIGN_CENTER);cell33.setVerticalAlignment(cell.ALIGN_MIDDLE);cell44.setHorizontalAlignment(Element.ALIGN_CENTER);cell44.setVerticalAlignment(Element.ALIGN_CENTER);cell44.setVerticalAlignment(cell.ALIGN_MIDDLE);cell55.setHorizontalAlignment(Element.ALIGN_CENTER);cell55.setVerticalAlignment(Element.ALIGN_CENTER);cell55.setVerticalAlignment(cell.ALIGN_MIDDLE);cell66.setHorizontalAlignment(Element.ALIGN_CENTER);cell66.setVerticalAlignment(Element.ALIGN_CENTER);cell66.setVerticalAlignment(cell.ALIGN_MIDDLE);cell77.setHorizontalAlignment(Element.ALIGN_CENTER);cell77.setVerticalAlignment(Element.ALIGN_CENTER);cell77.setVerticalAlignment(cell.ALIGN_MIDDLE);cell88.setHorizontalAlignment(Element.ALIGN_CENTER);cell88.setVerticalAlignment(Element.ALIGN_CENTER);cell88.setVerticalAlignment(cell.ALIGN_MIDDLE);table.addCell(cell11);table.addCell(cell22);table.addCell(cell33);table.addCell(cell44);table.addCell(cell55);table.addCell(cell66);table.addCell(cell77);table.addCell(cell88);}document.add(table);document.close();}upload(rwbh);} catch (Exception e) {System.out.println("file create exception");}

4.效果图

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