注意:本例子是从向模板定义的变量赋值,而不是从无到有的来生成pdf

         直接就能用

maven依赖:

        <dependency>
            <groupId>com.lowagie</groupId>
            <artifactId>itext</artifactId>
            <version>4.2.1</version>
        </dependency>

工具类:

package com.upincar.pdfdemo2.demo;

import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;

public class PDFTemplet {

    public void PDFTemplet (File file)throws Exception{
        //本地模板路径
        String templatePdfPath = PDFTemplet.class.getResource("/pdf/" + "/notice_template.pdf").toString();
        //生产pdfreader
        PdfReader reader = new PdfReader(templatePdfPath);
        ByteArrayOutputStream bos=new ByteArrayOutputStream();
        /* 读取*/
        PdfStamper pdfStamper= new PdfStamper(reader,bos);
        /*设置字体格式*/
        BaseFont baseFont = BaseFont.createFont("C:/WINDOWS/Fonts/SIMSUN.TTC,1", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        
        ArrayList<BaseFont> fontList=new ArrayList<>();
        fontList.add(baseFont);
        AcroFields s=pdfStamper.getAcroFields();
        s.setSubstitutionFonts(fontList);

        /*Field , 这个是自己在pdf上定义的变量名称*/
        s.setField("sign_year","2019");
        s.setField("sign_month","06");
        s.setField("sign_day","27");
        pdfStamper.setFormFlattening(true);
        pdfStamper.close();
        FileOutputStream fileSteam =new FileOutputStream(file);
        fileSteam.write(bos.toByteArray());
        fileSteam.close();
    }

}

测试类

package com.upincar.pdfdemo2.demo;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import java.io.File;

@RestController
public class TestController{
    @RequestMapping(value ="downloadJavaPdf", method = RequestMethod.GET)
    public String downloadJavaPdf(HttpServletRequest request) throws Exception {
        PDFTemplet pdfTT = new PDFTemplet();
        File file = new File("D:/测试用.pdf");
        file.createNewFile();
        pdfTT.PDFTemplet(file);
        return "生成成功";
    }
}

项目结构