iText生成PDF

柔情只为你懂 2022-05-30 09:40 249阅读 0赞

一、什么是PDF

PDF全称Portable Document Format，是Adobe公司开发的电子文件格式。这种文件格式与操作系统平台无关，也就是说，PDF文件不管是在Windows，Unix还是在苹果公司的Mac OS操作系统中都是通用的。这一特点使它成为在Internet上进行电子文档发行和数字化信息传播的理想文档格式。越来越多的电子图书、产品说明、公司文告、网络资料、电子邮件开始使用PDF格式文件。PDF格式文件目前已成为数字化信息事实上的一个工业标准。  
  
        PDF文件格式可以将文字、字型、格式、颜色及独立于设备和分辨率的图形图像等封装在一个文件中。一般pdf的纸张默认是A4型号。

二、项目运用

1.Maven项目需要添加以下依赖：

<dependency>
        <groupId>com.itextpdf</groupId>
        <artifactId>itextpdf</artifactId>
        <version>5.5.8</version>
    </dependency>
    
    <dependency>
        <groupId>com.itextpdf</groupId>
        <artifactId>itext-asian</artifactId>
        <version>5.2.0</version>
    </dependency>

2.定义抽象类CreatePdf

package cn.sh.sstic.exp.pdf;
    
    import java.io.IOException;
    import java.net.MalformedURLException;
    
    import org.apache.log4j.Logger;
    
    import cn.sh.sstic.exp.comm.base.util.ConfigUtil;
    
    import com.itextpdf.text.BadElementException;
    import com.itextpdf.text.BaseColor;
    import com.itextpdf.text.Document;
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.Element;
    import com.itextpdf.text.Font;
    import com.itextpdf.text.Image;
    import com.itextpdf.text.Phrase;
    import com.itextpdf.text.Rectangle;
    import com.itextpdf.text.pdf.BaseFont;
    import com.itextpdf.text.pdf.ColumnText;
    import com.itextpdf.text.pdf.PdfContentByte;
    import com.itextpdf.text.pdf.PdfPCell;
    import com.itextpdf.text.pdf.PdfPTable;
    import com.itextpdf.text.pdf.PdfPageEventHelper;
    import com.itextpdf.text.pdf.PdfTemplate;
    import com.itextpdf.text.pdf.PdfWriter;
    
    public abstract class CreatePdf  
    {
    	protected Logger log = Logger.getLogger(getClass());
    	
    	protected String outfile;
    	
    	private String imgPath;
    	
    	protected void setOutfile(String outfile) {
    		this.outfile = outfile;
    	}
    	protected void setImgPath(String imgPath){
    		this.imgPath = imgPath;
    	}
    	
    	/**
    	 * 生成水印的内部类,itext推荐采用内部类使用 
    	 *
    	 */
    	protected class Watermark extends PdfPageEventHelper{
    		private Image image = null;
    		private PdfTemplate total = null;
    		private Font f = null;
    		private String header = "";
    		
    		/**
    		 * 生成水印图片，图片只生成一次,
    		 */
    		public void onOpenDocument(PdfWriter writer,Document document){
    			f = createFont(8F, Font.NORMAL, BaseColor.BLACK);
    			total = writer.getDirectContent().createTemplate(8, 12);
    			if(imgPath==null){
    				imgPath = ConfigUtil.getProperty("mark");
    				log.warn(String.format("未设置PDF水印地点，已配置文件地址[%s]地址为准", imgPath));
    			}
    			try {
    				image = Image.getInstance(imgPath);
    				image.setAbsolutePosition(87.5F, 230F);
    				image.scaleAbsolute(400F, 400F);
    			} catch (BadElementException e) {
    				log.error("生成水印文件出现BadElementException异常",e);
    			} catch (MalformedURLException e) {
    				log.error("生成水印文件出现MalformedURLException异常",e);
    			} catch (IOException e) {
    				log.error("生成水印文件出现IOException异常",e);
    			}
    		}
    		
    		public void onEndPage(PdfWriter writer,Document document){
    			PdfContentByte contentByte = writer.getDirectContentUnder();
    			try {
    				contentByte.addImage(image);
    			} catch (DocumentException e) {
    				log.error("生成水印向PDF中添加时发生DocumentException异常",e);
    			}
    			ColumnText.showTextAligned(contentByte, Element.ALIGN_CENTER, null, 50f, 50f,0f);
    			
    			PdfPTable table = new PdfPTable(new float[]{100F});
    			table.setTotalWidth(465F);
    			table.setLockedWidth(true);
    			table.getDefaultCell().setFixedHeight(20F);
    			table.getDefaultCell().setBorder(Rectangle.TOP);
    			table.addCell(header);
    			
    			PdfPTable tablef = new PdfPTable(new float[]{22f,8f,15f,8f,47f});
    			tablef.setTotalWidth(150f);
    			PdfPCell pcf = new PdfPCell(new Phrase("第",f));
    			pcf.setVerticalAlignment(Element.ALIGN_TOP);
    			pcf.setHorizontalAlignment(Element.ALIGN_RIGHT);
    			pcf.setBorderWidth(Rectangle.NO_BORDER);
    			tablef.addCell(pcf);
    			pcf = new PdfPCell(new Phrase(Integer.toString(writer.getPageNumber()),f));
    			pcf.setVerticalAlignment(Element.ALIGN_TOP);
    			pcf.setHorizontalAlignment(Element.ALIGN_CENTER);
    			pcf.setBorderWidth(Rectangle.NO_BORDER);
    			tablef.addCell(pcf);
    			pcf = new PdfPCell(new Phrase("页 共",f));
    			pcf.setVerticalAlignment(Element.ALIGN_TOP);
    			pcf.setHorizontalAlignment(Element.ALIGN_RIGHT);
    			pcf.setBorderWidth(Rectangle.NO_BORDER);
    			tablef.addCell(pcf);
    			try {
    				pcf = new PdfPCell(Image.getInstance(total));
    			} catch (BadElementException e) {
    				log.error("添加总页数时出现异常",e);
    			}
    			pcf.setVerticalAlignment(Element.ALIGN_TOP);
    			pcf.setHorizontalAlignment(Element.ALIGN_CENTER);
    			pcf.setBorderWidth(Rectangle.NO_BORDER);
    			tablef.addCell(pcf);
    			pcf = new PdfPCell(new Phrase("页",f));
    			pcf.setVerticalAlignment(Element.ALIGN_TOP);
    			pcf.setHorizontalAlignment(Element.ALIGN_LEFT);
    			pcf.setBorderWidth(Rectangle.NO_BORDER);
    			tablef.addCell(pcf);
    			
    			table.writeSelectedRows(0, -1, 65, 40, writer.getDirectContent());
    			tablef.writeSelectedRows(0, -1, 250, 40, writer.getDirectContent());
    		}
    		
    		public void onCloseDocument(PdfWriter writer,Document document){
    			ColumnText.showTextAligned(total, Element.ALIGN_LEFT, 
    					new Phrase(String.valueOf(writer.getPageNumber()-1),f),
    					2, 2, 0);
    		}
    	}
    	
    	/**
    	 * 中文宋体，可以设置字体颜色、大小、样式
    	 * @param size 字体大小
    	 * @param style 字体样式,推荐FontStyle注入
    	 * @param color 字体色彩,推荐BaseColor注入
    	 * @return
    	 */
    	public Font createFont(final float size,final int style,final BaseColor color){
    		BaseFont bf = null;
    		Font f = null;
    		try {
    			bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",BaseFont.EMBEDDED);
    			f = new Font(bf);
    			f.setStyle(style);
    			f.setSize(size);
    			f.setColor(color);
    		} catch (DocumentException e) {
    			log.error("生成baseFont时出现DocumentException异常",e);
    		} catch (IOException e) {
    			log.error("生成baseFont时出现IOException异常",e);
    		}
    		return f;
    	}
    	
    }

3.定义工具类ProjectPdf

package cn.sh.sstic.exp.pdf;
    
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.Map;
    
    import com.itextpdf.text.BaseColor;
    import com.itextpdf.text.Document;
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.Element;
    import com.itextpdf.text.Font;
    import com.itextpdf.text.PageSize;
    import com.itextpdf.text.Paragraph;
    import com.itextpdf.text.Phrase;
    import com.itextpdf.text.pdf.ColumnText;
    import com.itextpdf.text.pdf.PdfPCell;
    import com.itextpdf.text.pdf.PdfPTable;
    import com.itextpdf.text.pdf.PdfWriter;
    
    public class ProjectPdf extends CreatePdf 
    {
    	private final String HEADER="某某委员会\n某某邀请函";
    	
    	private final float[][] COLUMNS = {
       {65F,80F,530F,790F},{65F,80F,530F,790F}};
    	
    	private Map<String, Object> map;
    	
    	public void setOutFile(String outfile){
    		setOutfile(outfile);
    	}
    
    	public Map<String, Object> getMap() {
    		return map;
    	}
    	
    	public void setMap(Map<String, Object> map) {
    		this.map = map;
    		setImgPath(String.valueOf(map.get("purl")));
    	}
    
    	public void createPdf(){
    		OutputStream os = null;
    		Document document = null;
    		PdfWriter writer = null;
    		try{
    			os = new FileOutputStream(outfile);
    			document = new Document(PageSize.A4);
    			writer = PdfWriter.getInstance(document, os);
    			writer.setPageEvent(new Watermark());
    			document.open();
    			ColumnText columnText = new ColumnText(writer.getDirectContent());
    			columnText.addElement(createHeader());
    			columnText.addElement(createHello());
    			columnText.addElement(create_1());
    			columnText.addElement(create_2());
    			columnText.addElement(create_3());
    			columnText.addElement(create_4());
    			columnText.addElement(create_5());
    			columnText.addElement(create_6());
    			columnText.addElement(create_7());
    			columnText.addElement(create_8());
    			columnText.addElement(create_9());
    			columnText.addElement(create_10());
    			columnText.addElement(create_11());
    			int status = ColumnText.START_COLUMN;
    			int column = 0;
    			while(ColumnText.hasMoreText(status)){
    				columnText.setSimpleColumn(COLUMNS[0][0], COLUMNS[0][1], COLUMNS[0][2], COLUMNS[0][3]);
    				status = columnText.go();
    				if(column==0){
    					document.newPage();
    				}
    				columnText.setYLine(COLUMNS[0][3]);
    			}
    		}catch(DocumentException e){
    			log.error("生成PDF时发生DocumentException异常",e);
    		}catch(IOException e){
    			log.error("生成PDF时发生IOException异常",e);
    		}finally{
    			if(document!=null){
    				document.close();
    			}
    			if(writer!=null){
    				writer.close();
    			}
    			if(os!=null){
    				try {
    					os.close();
    				} catch (IOException e) {
    					log.error("关闭OutputStream时发生IOException异常",e);
    				}
    			}
    		}
    	}
    	
    	private Paragraph createHeader(){
    		Font f = createFont(22F, Font.BOLD, BaseColor.BLACK);
    		Paragraph p=new Paragraph();
    		p.setAlignment(Element.ALIGN_CENTER);
    		p.setFont(f);
    		p.setLeading(24F);
    		p.setSpacingAfter(20f);
    		p.add(HEADER);
    		return p;
    	}
    	
    	private Paragraph createHello(){
    		String hello=String.format("%s 专家:\n          您好！", map.get("userName"));
    		Paragraph p = createParaWithoutFirstIndent(hello);
    		p.setSpacingAfter(6F);
    		return p; 
    	}
    	
    	private Paragraph create_1(){
    		String str = String.format("%s中小企业技术创新资金财务预" +
    				"评已经开始了，某某委员会特聘请您作为%s的财务预评专家，参与项目评审工作。此次项目预评以网上评审的形式进行，请在" +
    				"%s到%s期间登录%s网站评审您所负责的项目。如 果您网上评审有困难，请及早与我们联系，以免耽误评审工作，感谢您对我们工作的支持。有关说明具" +
    				"体如下： ", map.get("nowYear"),map.get("proName"),map.get("startDt"),map.get("endDt"),map.get("webUrl"));
    		Paragraph p = createParaWithFirstIndent(str);
    		p.setSpacingAfter(11F);
    		return p;
    	}
    	
    	private Paragraph create_2(){
    		String str = "一、评审信息：";
    		Paragraph p = createParaWithoutFirstIndent(str);
    		p.setSpacingAfter(11F);
    		return p;
    	}
    	
    	private PdfPTable create_3(){
    		PdfPTable table = new PdfPTable(new float[]{12.5F,27.1F,28.7F,4F,27.7F});
    		table.setWidthPercentage(93F);
    		table.setHorizontalAlignment(Element.ALIGN_LEFT);
    		table.setSpacingAfter(11F);
    		PdfPCell cell = buildCell_1("专家登录:");
    		cell.setRowspan(3);
    		table.addCell(cell);
    		
    		cell = buildCell_2("证件号：");
    		table.addCell(cell);
    		cell = buildCell_3("   "+map.get("cert"));
    		cell.setColspan(3);
    		table.addCell(cell);
    		
    		cell = buildCell_2("登录密码： ");
    		table.addCell(cell);
    		cell = buildCell_3("   "+map.get("passWd"));
    		cell.setColspan(3);
    		table.addCell(cell);
    		
    		cell = buildCell_2("账号有效期： ");
    		table.addCell(cell);
    		cell = buildCell_3("   "+map.get("startDt"));
    		table.addCell(cell);
    		cell = buildCell_2("至");
    		table.addCell(cell);
    		cell = buildCell_3("   "+map.get("endDt"));
    		table.addCell(cell);
    		
    		cell = buildCell_2("联系方式：");
    		table.addCell(cell);
    		cell = buildCell_3("   "+map.get("relation"));
    		cell.setColspan(4);
    		table.addCell(cell);
    		
    		cell = buildCell_2("评审说明：");
    		table.addCell(cell);
    		cell = buildCell_3("   "+map.get("review"));
    		cell.setColspan(4);
    		table.addCell(cell);
    		return table;
    	}
    	
    
    	
    	private PdfPCell buildCell_1(String str){
    		Font f = createFont(9.5F, Font.NORMAL, BaseColor.BLACK);
    		Phrase p = new Phrase();
    		p.setFont(f);
    		p.add(str);
    		PdfPCell cell = new PdfPCell(p);
    		cell.setVerticalAlignment(Element.ALIGN_TOP);
    		cell.setHorizontalAlignment(Element.ALIGN_CENTER);
    		return cell;
    	}
    	
    	private PdfPCell buildCell_2(String str){
    		Font f = createFont(9.5F, Font.NORMAL, BaseColor.BLACK);
    		Phrase p = new Phrase();
    		p.setFont(f);
    		p.add(str);
    		PdfPCell cell = new PdfPCell(p);
    		cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
    		cell.setHorizontalAlignment(Element.ALIGN_CENTER);
    		return cell;
    	}
    	
    	private PdfPCell buildCell_3(String str){
    		Font f = createFont(9.5F, Font.NORMAL, BaseColor.BLACK);
    		Phrase p = new Phrase();
    		p.setFont(f);
    		p.add(str);
    		PdfPCell cell = new PdfPCell(p);
    		cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
    		cell.setHorizontalAlignment(Element.ALIGN_LEFT);
    		return cell;
    	}
    	
    	private Paragraph createParaWithFirstIndent(String str){
    		Font f = createFont(9.8F, Font.NORMAL, BaseColor.BLACK);
    		Paragraph p = new Paragraph();
    		p.setAlignment(Element.ALIGN_LEFT);
    		p.setFont(f);
    		p.setFirstLineIndent(22F);
    		p.setLeading(15F);
    		p.add(str);
    		return p;
    	}
    	
    	private Paragraph createParaWithoutFirstIndent(String str){
    		Font f = createFont(9.8F, Font.NORMAL, BaseColor.BLACK);
    		Paragraph p = new Paragraph();
    		p.setAlignment(Element.ALIGN_LEFT);
    		p.setFont(f);
    		p.setLeading(15F);
    		p.add(str);
    		return p;
    	}
    	
    	private Paragraph createParaRight(String str){
    		Font f = createFont(9.5F, Font.NORMAL, BaseColor.BLACK);
    		Paragraph p = new Paragraph();
    		p.setAlignment(Element.ALIGN_RIGHT);
    		p.setIndentationRight(20F);
    		p.setFont(f);
    		p.setLeading(15F);
    		p.add(str);
    		return p;
    	}
    	
    	
    }