itextpdf使用

LK最近项目中要进行对pdf的操作，具体需求是要在现有pdf文件末尾加入一下文字。

1. 首先需要准备的jar包，itextpdf-5.5.5.jar和itext-asian-5.2.0.jar
   jar包可以在maven仓库中下
   >https://mvnrepository.com/
   下完以后新建项目导入就行
   

2. 代码

package test;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import com.itextpdf.text.Element;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
/**
* @Description:使用itextpdf在已有pdf文件中追加图片和文字
* @author yrz
*	@version:1.0
*/
public class itText {
   public static void main(String[] args) throws Exception {
   	PdfReader reader = new PdfReader("E://tu100.pdf");// 指定将和 图片拼接的 PDF
   	PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("E://tu101.pdf"));// 生成的PDF 路径
   	PdfContentByte overContent = stamper.getOverContent(1);
   	String imgPath = "E://td2.jpg";
   	String str = " ,cv0001,cv0002,cv0003,cv0004,cv0001,cv0002,cv0003,cv0004,cv0001,cv0002,cv0003,cv0004,cv0001,cv0002,cv0003,cv0004";
   	addImg(overContent,imgPath);
   	addtext(overContent, str);
   	System.out.println("追加成功");
   	overContent.stroke();
   	stamper.close();
   	reader.close();

   }

   /**
    * @Description:添加图片
    * @param overContent
    * @param path
    * @throws Exception
    */
   public static void addImg(PdfContentByte overContent, String path) throws Exception {
   	// 添加图片
   	Image image = Image.getInstance(path);// 图片名称
   	image.scaleAbsolute(500, 20);

   	image.setAbsolutePosition(20, 5);// 左边距、底边距
   	overContent.addImage(image);
   }

   /**
    * @Description:追加文字
    * @param overContent
    * @param str
    * @throws Exception
    */
   public static void addtext(PdfContentByte overContent, String str) throws Exception {
   	StringBuffer bufAll = new StringBuffer();

   	StringBuffer buf = new StringBuffer();

   	int a = 0;
   	int b = 0;
   	String by[] = str.split(",");

   	// 每10个换行
   	for (int i = 1; i < by.length; i++) {
   		buf.append(new String(by[i]) + " ");
   		if (i % 10 != 0 && i == by.length - 1) {
   			bufAll.append(buf.toString());
   		} else if (i % 10 == 0) {
   			b = i;
   			bufAll.append(buf.toString() + "__");
   			buf.delete(0, buf.length());
   			a = b;
   			b = 0;

   		}
   	}

   	System.out.println(bufAll.toString());
   	if (bufAll.toString().contains("__")) {
   		String aa[] = bufAll.toString().split("__");
   		BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
   		overContent.beginText();
   		overContent.setFontAndSize(font, 8);
   		overContent.setTextMatrix(200, 200);
   		// pdf中换行
   		for (int i = 1; i < aa.length; i++) {
   			overContent.showTextAligned(Element.ALIGN_CENTER, "" + aa[i] + "", 250, i * 10, 0);
   		}

   		overContent.showTextAligned(Element.ALIGN_CENTER, "参与此次实验的毒株编号：" + aa[0] + "", 250, aa.length * 10, 0);
   		overContent.endText();

   	}

   }
}

3. 效果展示

原始图：

== 追加文字后 ==

最后附上学习地址：https://www.yiibai.com/javaexamples/java_itext.html

接下来考虑使用表格改进