java生成pdf

使用itext在java后端生成pdf,采用的jar包注意依赖问题，下面是我使用的

<!-- pdf -->
		<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>

pdf生成

/**
	 * 创建pdf
	 * @param examjson
	 * @param paperid
	 * @param path
	 * @param pathimg
	 * @return
	 */
 public String createPdfAdd1(String examjson , Integer paperid , String path ,String pathimg){
    	//Map<String, Object> exam = JSONObject.parseObject(examjson, new TypeReference<Map<String, Object>>() { });
    	String examPath = "";
    	try{
    	//创建文件
        Document document = new Document();
        //设置字体
        BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        //文件路径	
        examPath = path+"/exam-"+paperid;
        File files = new File(examPath);
	    if(! files.exists() && !files.isDirectory()) {					//判断目录是否存在
				files.mkdir();
	    }
	    //创建PDF
	    PdfWriter writer =  PdfWriter.getInstance(document, new FileOutputStream(examPath+"/test.pdf"));
        // 设置页面布局
        writer.setViewerPreferences(PdfWriter.PageLayoutOneColumn);
        // 页码
        writer.setPageEvent(new PageXofYTest());
        //打开文件
        document.open();
        //图片1
        Image image1 = Image.getInstance(pathimg+"/zy3.jpg");
        //设置图片的宽度和高度
        //image1.scaleAbsolute(140, 40);
        //将图片1添加到pdf文件中
        document.add(image1);
        //标题
        Paragraph paragraph = new Paragraph(150);//段落的间距
        //1 2 3  中右左
        paragraph.setAlignment(1);  //对齐方式
        Font font = new Font(bfChinese);//字体
        font.setSize(22);//字体大小
        paragraph.setFont(font);//设置段落字体
        Chunk chunk = new Chunk("Test");
        paragraph.add(chunk);  
        document.add(paragraph);
        
        Paragraph paragraph1 = new Paragraph(40);
        //1 2 3  中右左
        paragraph1.setAlignment(1);  //对齐方式
        Font font1 = new Font(bfChinese);//字体
        font1.setSize(20);
        paragraph1.setFont(font1);
        Chunk chunk1 = new Chunk("Test1");  
        paragraph1.add(chunk1); 
        //paragraph1.setSpacingBefore(-15);
        //paragraph1.setSpacingAfter(-50);//往下距离200
        document.add(paragraph1);
        
          //点线
        DottedLineSeparator line = new DottedLineSeparator();
        //下移5个单位
        line.setOffset(-15);
        //设置点之间的距离
        //line.setGap(20);
        document.add(line);
        
        Paragraph paragraph3 = new Paragraph(150);
        //1 2 3  中右左
        paragraph3.setAlignment(1);  //对齐方式
        Font font3 = new Font(bfChinese);//字体
        font3.setSize(12);
        paragraph3.setFont(font3);
        Chunk chunk3 = new Chunk("编号："+getRandom(17));  
        paragraph3.add(chunk3); 
        paragraph3.setSpacingAfter(5);
        document.add(paragraph3);
        
        Paragraph paragraph4 = new Paragraph(15);
        //1 2 3  中右左
        paragraph4.setAlignment(1);  //对齐方式
        Font font4 = new Font(bfChinese);//字体
        font4.setSize(12);
        paragraph4.setFont(font4);
        SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月dd日");  
        Chunk chunk4 = new Chunk("文档生成日期："+df.format(System.currentTimeMillis()));  
        paragraph4.add(chunk4); 
        paragraph4.setSpacingAfter(5);
        document.add(paragraph4);
   
        document.newPage(); //换页
     
    	Paragraph answerPar = new Paragraph(20);				//标准答案
    	answerPar.setAlignment(3);  //对齐方式
		Font answerfont = new Font(bfChinese);//字体
		answerfont.setSize(12);
		answerPar.setFont(answerfont);
        Chunk answerchunk = new Chunk(examjson);
        answerPar.add(answerchunk); 
        answerPar.setSpacingAfter(5);
        document.add(answerPar);
        //关闭文档
        document.close();
        //关闭书写器
        writer.close();
    	}catch(Exception e){
    		e.printStackTrace();
    	}
    	
    	ZIPUtil.compress(examPath,path+"/exam-"+paperid+".zip" );		//压缩
       return "ok";
	}

调用方法后生成文件夹及压缩文件

pdf效果如下：

生成指定位数的随机数

/**
	 * 生成指定位数的随机数
	 * @param length
	 * @return
	 */
	public static String getRandom(int length){
		String val = "";
		Random random = new Random();
		for (int i = 0; i < length; i++) {
			val += String.valueOf(random.nextInt(10));
		}
		return val;
	}

页码

参考https://www.cnblogs.com/lyb0103/p/10218039.html
效果： 当前页/总页数，我进行了简单的修改，只显示当前页。

//页码事件
    private static class PageXofYTest extends PdfPageEventHelper{
        public PdfTemplate total;

        public BaseFont bfChinese;

        /**
         * 重写PdfPageEventHelper中的onOpenDocument方法
         */
        @Override
        public void onOpenDocument(PdfWriter writer, Document document) {
            // 得到文档的内容并为该内容新建一个模板
            total = writer.getDirectContent().createTemplate(500, 500);
            try {

                String prefixFont = "";
                String os = System.getProperties().getProperty("os.name");
                if(os.startsWith("win") || os.startsWith("Win")){
                    prefixFont = "C:\\Windows\\Fonts" + File.separator;
                }else {
                    prefixFont = "/usr/share/fonts/chinese" + File.separator;
                }

                // 设置字体对象为Windows系统默认的字体
                //bfChinese = BaseFont.createFont(prefixFont + "simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
                bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            } catch (Exception e) {
                throw new ExceptionConverter(e);
            }
        }

        /**
         * 重写PdfPageEventHelper中的onEndPage方法
         */
        @Override
        public void onEndPage(PdfWriter writer, Document document) {
            // 新建获得用户页面文本和图片内容位置的对象
            PdfContentByte pdfContentByte = writer.getDirectContent();
            // 保存图形状态
            pdfContentByte.saveState();
            String text ="www.rkpass.cn   "+ writer.getPageNumber();
            // 获取点字符串的宽度
            float textSize = bfChinese.getWidthPoint(text, 15);
            pdfContentByte.beginText();
            // 设置随后的文本内容写作的字体和字号
            pdfContentByte.setFontAndSize(bfChinese, 15);

            // 定位'X/'
            //System.out.println(document.right() +"...."+ document.left());
           // float x = (document.right() + document.left())/2;
            float x = (document.right()-150f);
            float y = 20f;
            pdfContentByte.setTextMatrix(x, y);
            pdfContentByte.showText(text);
            pdfContentByte.endText();

            // 将模板加入到内容（content）中- // 定位'Y'
            pdfContentByte.addTemplate(total, x + textSize, y);

            pdfContentByte.restoreState();
        }

        /**
         * 重写PdfPageEventHelper中的onCloseDocument方法
         */
       /* @Override
        public void onCloseDocument(PdfWriter writer, Document document) {
            total.beginText();
            try {
                String prefixFont = "";
                String os = System.getProperties().getProperty("os.name");
                if(os.startsWith("win") || os.startsWith("Win")){
                    prefixFont = "C:\\Windows\\Fonts" + File.separator;
                }else {
                    prefixFont = "/usr/share/fonts/chinese" + File.separator;
                }

                bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
                total.setFontAndSize(bfChinese, 15);
            } catch (DocumentException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            total.setTextMatrix(0, 0);
            // 设置总页数的值到模板上，并应用到每个界面
            total.showText(String.valueOf(writer.getPageNumber() - 1));
            total.endText();
        }*/
    }

压缩

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class ZIPUtil {
	private static Logger logger = LoggerFactory.getLogger(ZIPUtil.class);
	 /**s
     * 压缩文件
     * @param srcFilePath 压缩源路径
     * @param destFilePath 压缩目的路径
     */
    public static void compress(String srcFilePath, String destFilePath) {
        //
        File src = new File(srcFilePath);
 
        if (!src.exists()) {
            throw new RuntimeException(srcFilePath + "不存在");
        }
        File zipFile = new File(destFilePath);
 
        try {
 
            FileOutputStream fos = new FileOutputStream(zipFile);
            ZipOutputStream zos = new ZipOutputStream(fos);
            String baseDir = "";
            compressbyType(src, zos, baseDir);
            zos.close();
 
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
 
        }
    }
    /**
     * 按照原路径的类型就行压缩。文件路径直接把文件压缩，
     * @param src
     * @param zos
     * @param baseDir
     */
     private static void compressbyType(File src, ZipOutputStream zos,String baseDir) {
 
            if (!src.exists())
                return;
            logger.info("压缩路径" + baseDir + src.getName());
            //判断文件是否是文件，如果是文件调用compressFile方法,如果是路径，则调用compressDir方法；
            if (src.isFile()) {
                //src是文件，调用此方法
                compressFile(src, zos, baseDir);
                 
            } else if (src.isDirectory()) {
                //src是文件夹，调用此方法
                compressDir(src, zos, baseDir);
 
            }
 
        }
     /**
      * 压缩文件
     */
     private static void compressFile(File file, ZipOutputStream zos,String baseDir) {
         if (!file.exists())
             return;
         try {
             BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
             ZipEntry entry = new ZipEntry(baseDir + file.getName());
             zos.putNextEntry(entry);
             int count;
             byte[] buf = new byte[1024];
             while ((count = bis.read(buf)) != -1) {
                 zos.write(buf, 0, count);
             }
             bis.close();

         } catch (Exception e) {
           // TODO: handle exception

         }
     }
      
     /**
      * 压缩文件夹
      */
     private static void compressDir(File dir, ZipOutputStream zos,String baseDir) {
         if (!dir.exists())
             return;
         File[] files = dir.listFiles();
         if(files.length == 0){
             try {
                 zos.putNextEntry(new ZipEntry(baseDir + dir.getName()+File.separator));
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
         for (File file : files) {
             compressbyType(file, zos, baseDir + dir.getName() + File.separator);
         }
     }

}