itext生成pdf

最近写了一个java后端生成pdf程序，因此我在这里提供自己生成pdf的一个策略。

使用itext生成pdf

iText的依赖

<dependency>
     <groupId>com.itextpdf</groupId>
     <artifactId>itextpdf</artifactId>
     <version>5.5.6</version>
   </dependency>

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

这两程序是都需要的，特别是第二个依赖，是itext能够使用字体的重要的依赖

代码实践

学习参考

iText中文帮助文档 - 豆丁网 (docin.com)

生成pdf的代码

package com.dwx.utils;

import com.dwx.pojo.g_hld1;
import com.dwx.pojo.g_hld2;
import com.itextpdf.text.*;
import com.itextpdf.text.Font;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;

import javax.swing.*;
import java.awt.*;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;

//这是一个生成pdf的工具类
public class pdfUtils {

    public Map<String,Object> setPDF(String E,String I,String S,String N,String TT,String F,String J,String P,String csrul,String personalityProfile,String personalityDescription,String field,String careerStudent,String career) throws Exception{

        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        //创建一个新的文档
        //创建一个空的文档并且设置文档的大小
        Document document = new Document(PageSize.A4);

        PdfWriter.getInstance(document, stream);


        //打开文档 准备添加数据
        document.open();

        //添加数据
        //创建字体 基本字体 字体需要不同定制都是以这个基础字体为基础的
        BaseFont baseFont = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
        //固定格式部分
        //主标题
        String T = "MBTI职业性格测试报告";
        Paragraph Title = new Paragraph();
        Title.setFont(new Font(baseFont,23,0));
        //居中
        Title.setAlignment(Element.ALIGN_CENTER);
        Title.add(T);

        Title.setSpacingAfter(25);
        Title.setSpacingBefore(25);

        //副标题
        String t = "你的性格类型是:"+csrul;
        Paragraph title = new Paragraph();
        title.setFont(new Font(baseFont,12,0));
        //居中
        title.setAlignment(Element.ALIGN_CENTER);
        title.add(t);
        title.setSpacingAfter(10);
        title.setSpacingBefore(0);

        //添加百分比部分
        String TT1 = E+"%   外向(E) ---- 内向(I)  "+I+"%";
        String TT2 = S+"%   感觉(S) ---- 直觉(N)  "+N+"%";
        String TT3 = TT+"%   思考(T) ---- 感情(F)  "+F+"%";
        String TT4 = J+"%   判断(J) ---- 知觉(P)  "+P+"%";

        Paragraph tt1 = new Paragraph();
        tt1.setFont(new Font(baseFont,10,0));
        tt1.add(TT1);
        tt1.setAlignment(Element.ALIGN_CENTER);
        Paragraph tt2 = new Paragraph();
        tt2.setFont(new Font(baseFont,10,0));
        tt2.add(TT2);
        tt2.setAlignment(Element.ALIGN_CENTER);
        Paragraph tt3 = new Paragraph();
        tt3.setFont(new Font(baseFont,10,0));
        tt3.add(TT3);
        tt3.setAlignment(Element.ALIGN_CENTER);
        Paragraph tt4 = new Paragraph();
        tt4.setFont(new Font(baseFont,10,0));
        tt4.add(TT4);
        tt4.setAlignment(Element.ALIGN_CENTER);




        //第一部分
        String t1 = "一、性格特点";
        Paragraph T1 = new Paragraph();
        T1.setFont(new Font(baseFont,15,0));
        T1.add(t1);
        T1.setSpacingAfter(10);
        T1.setSpacingBefore(10);

        //第二部分

        String t2 = "1.概要";
        Paragraph T2 = new Paragraph();
        T2.setFont(new Font(baseFont,13,0));
        T2.add(t2);
        T2.setSpacingAfter(10);
        T2.setSpacingBefore(10);

        //第三部分
        String t3 = "2.描述";
        Paragraph T3 = new Paragraph();
        T3.setFont(new Font(baseFont,13,0));
        T3.add(t3);
        T3.setSpacingAfter(10);
        T3.setSpacingBefore(10);

        //第四部分
        String t4 = "二、适合领域";
        Paragraph T4 = new Paragraph();
        T4.setFont(new Font(baseFont,15,0));
        T4.add(t4);
        T4.setSpacingAfter(10);
        T4.setSpacingBefore(10);

        String t45 = "三、适合职业";
        Paragraph T45 = new Paragraph();
        T45.setFont(new Font(baseFont,15,0));
        T45.add(t45);
        T45.setSpacingAfter(10);
        T45.setSpacingBefore(10);


        //第五部分
        String t5 = "1.学生";
        Paragraph T5 = new Paragraph();
        T5.setFont(new Font(baseFont,13,0));
        T5.add(t5);

        T5.setSpacingAfter(10);
        T5.setSpacingBefore(10);

        //第六部分
        String t6 = "2.职场";
        Paragraph T6 = new Paragraph();
        T6.setFont(new Font(baseFont,13,0));
        T6.add(t6);

        T6.setSpacingAfter(10);
        T6.setSpacingBefore(10);


        //第七部分
        String t7 = "四、用户须知";
        Paragraph T7 = new Paragraph();
        T7.setFont(new Font(baseFont,15,0));
        T7.add(t7);

        T7.setSpacingAfter(10);
        T7.setSpacingBefore(10);


        //第八部分
        String p6 = "《性格分析报告》展示的是你的性格倾向，而不是你的知识、技能、经验。\n" +
                "MBTI提供的性格类型描述仅供测试者确定自己的性格类型之用，性格类型没有好坏，只有不同。每一种性格特征都有其价值和优点，也有缺点和需要注意的地方。清楚地了解自己的性格优劣势，有利于更好地发挥自己的特长，而尽可能的在为人处事中避免自己性格中的劣势，更好地和他人相处，更好地作重要的决策。\n" +
                "";
        Paragraph P6 = new Paragraph();
        P6.setFont(new Font(baseFont,10,0));
        P6.add(p6);
        P6.setLeading(15.5f);

        //尾缀一
        String l1 = "[性格无好坏，人生各不同]";
        Paragraph L1 = new Paragraph();
        L1.setFont(new Font(baseFont,10,0));
        L1.setSpacingBefore(50);
        //设置居中
        L1.setAlignment(Element.ALIGN_RIGHT);
        L1.add(l1);
        //尾缀二
        String l2 = "留心智愿";
        Paragraph L2 = new Paragraph();
        L2.setFont(new Font(baseFont,10,0));
        //设置居中
        L2.setAlignment(Element.ALIGN_RIGHT);
        L2.add(l2);
        //最后的时间

        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("uuuu/MM/dd");
        LocalDate localDate = LocalDate.now();
        int year = localDate.getYear();
        int monthValue = localDate.getMonthValue();
        int dayOfMonth = localDate.getDayOfMonth();
        System.out.println(year);
        System.out.println(monthValue );
        System.out.println(dayOfMonth);

        String data = year+"年"+monthValue+"月"+dayOfMonth+"日";
        Paragraph Data = new Paragraph();
        Data.setAlignment(Element.ALIGN_RIGHT);
        Data.setFont(new Font(baseFont,10,0));
        Data.add(data);



        //五个移动的数据
        String p1 = personalityProfile;
        String p2 = personalityDescription;
        String p3 = field;
        String p4 = careerStudent;
        String p5 = career;

        Paragraph P1 = new Paragraph();
        P1.setFont(new Font(baseFont,10,0));
        P1.add(p1);

        Paragraph P2 = new Paragraph();
        P2.setFont(new Font(baseFont,10,0));
        P2.add(p2);

        Paragraph P3 = new Paragraph();
        P3.setFont(new Font(baseFont,10,0));
        P3.add(p3);

        Paragraph P4 = new Paragraph();
        P4.setFont(new Font(baseFont,10,0));
        P4.add(p4);

        Paragraph P5 = new Paragraph();
        P5.setFont(new Font(baseFont,10,0));
        P5.add(p5);




        //将元素添加进去
        document.add(Title);
        document.add(title);
        document.add(tt1);
        document.add(tt2);
        document.add(tt3);
        document.add(tt4);
        document.add(T1);
        document.add(T2);
        document.add(P1);
        document.add(T3);
        document.add(P2);
        document.add(T4);
        document.add(P3);
        document.add(T45);
        document.add(T5);
        document.add(P4);
        document.add(T6);
        document.add(P5);
        document.add(T7);
        document.add(P6);
        document.add(L1);
        document.add(L2);
        document.add(Data);




        //关闭文档
        document.close();

        Map<String, Object> map = new HashMap<>();

        map.put("document",document);
        map.put("stream",stream);
        return map;
    }


    public Map<String,Object> setHldPDF(String R, String C, String E, String S, String A, String I, String d1, String d2, String d3, g_hld1 n1, g_hld1  n2, g_hld1  n3, g_hld2 d) throws Exception {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        //创建一个新的文档
        //创建一个空的文档并且设置文档的大小
        Document document = new Document(PageSize.A4);

        PdfWriter.getInstance(document, stream);


        //打开文档 准备添加数据
        document.open();

        //添加数据
        //创建字体 基本字体 字体需要不同定制都是以这个基础字体为基础的
        BaseFont baseFont = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);

        //创建标题
        String title = "霍兰德职业兴趣测试\n"+"深度分析报告";
        Paragraph Title = new Paragraph();
        Title.setFont(new Font(baseFont,20,0));
        //设置居中
        Title.setAlignment(Element.ALIGN_CENTER);
        Title.setLeading((float) (15.5f*1.5));
        Title.add(title);
        Title.setSpacingAfter(20);

        //创建文档中固定的部分
        String t1 = "测试结果       "+d.getAll_type();
        Paragraph T1 = new Paragraph();
        T1.setFont(new Font(baseFont,15));
        T1.add(t1);
        T1.setSpacingBefore(10);
        T1.setSpacingAfter(10);

        String t2 = "维度分析";
        Paragraph T2 = new Paragraph();
        T2.setFont(new Font(baseFont,15));
        T2.add(t2);
        T2.setAlignment(Element.ALIGN_CENTER);
        T2.setSpacingBefore(10);
        T2.setSpacingAfter(10);


        String t3 = "职业匹配";
        Paragraph T3  = new Paragraph();
        T3.setFont(new Font(baseFont,15));
        //设置居中
        T3.setAlignment(Element.ALIGN_CENTER);
        T3.add(t3);
        T3.setSpacingBefore(10);
        T3.setSpacingAfter(10);

        //设置可以活动的部分
        String p6 = d.getAll_career();
        Paragraph P6 = new Paragraph();
        P6.setFont(new Font(baseFont,10));
        P6.add(p6);

        String p1 = "现实型R  ----  "+R+"%"+"\n"
                +"传统型C  ----  "+C+"%"+"\n"
                +"企业型E  ----  "+E+"%"+"\n"
                +"社会型S  ----  "+S+"%"+"\n"
                +"艺术型A  ----  "+A+"%"+"\n"
                +"研究型I  ----  "+I+"%"+"\n";
        Paragraph P1 = new Paragraph();
        P1.setFont(new Font(baseFont,13));
        P1.add(p1);
        P1.setAlignment(Element.ALIGN_CENTER);
        P1.setLeading((float) (15.5f*1.5));

        P1.setSpacingBefore(10);
        P1.setSpacingAfter(10);

        String t4 = d1;
        switch (t4){
            case "R现实型": t4 = "R";break;
            case "C": t4 = "C";break;
            case "E": t4 = "E";break;
            case "S": t4 = "S";break;
            case "A": t4 = "A";break;
            case "I": t4 = "I";break;
            default:break;
        }
        Paragraph T4 = new Paragraph();
        T4.add(t4);
        T4.setFont(new Font(baseFont,15));
        String p3 = n1.getPersonality()+"\n"+"\n"+n1.getCareer();
        Paragraph P3 = new Paragraph();
        P3.setFont(new Font(baseFont,10));
        P3.add(p3);
        P3.setSpacingAfter(10);
        P3.setSpacingBefore(10);


        String t5 = d2;
        switch (t5){
            case "R现实型": t4 = "R"+"现实性";break;
            case "C": t4 = "C";break;
            case "E": t4 = "E";break;
            case "S": t4 = "S";break;
            case "A": t4 = "A";break;
            case "I": t4 = "I";break;
            default:break;
        }
        Paragraph T5 = new Paragraph();
        T5.add(t5);
        T5.setFont(new Font(baseFont,15));
        String p4 = n2.getPersonality()+"\n"+"\n"+n2.getCareer();
        Paragraph P4 = new Paragraph();
        P4.setFont(new Font(baseFont,10));
        P4.add(p4);
        P4.setSpacingAfter(10);
        P4.setSpacingBefore(10);


        String t6 = d3;
        switch (t6){
            case "R现实型": t4 = "R"+"现实性";break;
            case "C": t4 = "C";break;
            case "E": t4 = "E";break;
            case "S": t4 = "S";break;
            case "A": t4 = "A";break;
            case "I": t4 = "I";break;
            default:break;
        }
        Paragraph T6 = new Paragraph();
        T6.add(t6);
        T6.setFont(new Font(baseFont,15));


        String p5 = n3.getPersonality()+"\n"+"\n"+n3.getCareer();
        Paragraph P5 = new Paragraph();
        P5.setFont(new Font(baseFont,10));
        P5.add(p5);
        P5.setSpacingAfter(10);
        P5.setSpacingBefore(10);


        //尾缀一
        String l1 = "[兴趣无好坏，人生各不同]";
        Paragraph L1 = new Paragraph();
        L1.setFont(new Font(baseFont,10,0));
        L1.setSpacingBefore(50);
        //设置居中
        L1.setAlignment(Element.ALIGN_RIGHT);
        L1.add(l1);
        //尾缀二
        String l2 = "留心智愿";
        Paragraph L2 = new Paragraph();
        L2.setFont(new Font(baseFont,10,0));
        //设置居中
        L2.setAlignment(Element.ALIGN_RIGHT);
        L2.add(l2);
        //最后的时间

        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("uuuu/MM/dd");
        LocalDate localDate = LocalDate.now();
        int year = localDate.getYear();
        int monthValue = localDate.getMonthValue();
        int dayOfMonth = localDate.getDayOfMonth();
        System.out.println(year);
        System.out.println(monthValue );
        System.out.println(dayOfMonth);

        String data = year+"年"+monthValue+"月"+dayOfMonth+"日";
        Paragraph Data = new Paragraph();
        Data.setAlignment(Element.ALIGN_RIGHT);
        Data.setFont(new Font(baseFont,10,0));
        Data.add(data);




        //将片段加到文档中
        document.add(Title);
        document.add(P1);
        document.add(T1);

        document.add(T2);
        document.add(T4);
        document.add(P3);

        document.add(T5);
        document.add(P4);

        document.add(T6);
        document.add(P5);

        document.add(T3);
        document.add(P6);

        document.add(L1);
        document.add(L2);
        document.add(Data);

        document.close();

        Map<String, Object> map = new HashMap<>();

        map.put("document",document);
        map.put("stream",stream);
        return map;
    }


}

将pdf写到网页的代码

package com.dwx.controller;

import com.dwx.pojo.g_hld1;
import com.dwx.pojo.g_hld2;
import com.dwx.pojo.g_report;
import com.dwx.service.hld1Service;
import com.dwx.service.hld2Service;
import com.dwx.service.reportService;
import com.dwx.utils.pdfUtils;
import com.itextpdf.text.*;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;

import java.nio.charset.StandardCharsets;
import java.util.Map;

@Controller
public class ReportController {

    //嗲用service层
    @Autowired
    private reportService reportService;

    //调用hld1的service和hld2的service
    @Autowired
    private hld1Service hld1Service;
    @Autowired
    private hld2Service hld2Service;


    @RequestMapping("/getPDF")
    @ResponseBody
    public String getPdf(String E,String I,String S,String N,String T,String F,String J,String P,String csrul,HttpServletResponse resp) throws Exception {
        //设置下载pdf程序
        System.out.println(csrul);
        g_report report = reportService.getReport(csrul);
        System.out.println(report);

        System.out.println(E);
        System.out.println(I);
        System.out.println(S);
        System.out.println(N);
        System.out.println(T);
        System.out.println(F);
        System.out.println(J);
        System.out.println(P);

        //首先创建一个输出流

        //获得我们生成的pdf文档
        pdfUtils utils = new pdfUtils();
        String profile = report.getPersonalityProfile();
        String description = report.getPersonalityDescription();
        String career = report.getCareer();
        String student = report.getCareerStudent();
        String field = report.getField();
        Map<String, Object> map = utils.setPDF(E,I,S,N,T,F,J,P,csrul, profile,description,field,student,career );

        Document document = (Document) map.get("document");
        ByteArrayOutputStream  stream = (ByteArrayOutputStream) map.get("stream");


        //转化成流 直接输出
        resp.setHeader("Content-Disposition", "attachment; filename=" + new String((csrul + ".pdf").getBytes(), StandardCharsets.ISO_8859_1));
        resp.setContentLength(stream.size());

        ServletOutputStream streamOut = resp.getOutputStream();

        stream.writeTo(streamOut);


        return "ok";
    }


    @RequestMapping("/getHldPDF")
    @ResponseBody
    public String getHldPDF(String R,String C,String E,String S,String A,String I,String d1,String d2,String d3,String dimension,HttpServletResponse resp) throws Exception{


        switch (d1){
            case "R": d1 = "R现实型";break;
            case "C": d1 = "C传统型";break;
            case "E": d1 = "E管理型";break;
            case "S": d1 = "S社会型";break;
            case "A": d1 = "A艺术型";break;
            case "I": d1 = "I研究型";break;
            default:break;
        }
        switch (d2){
            case "R": d2 = "R现实型";break;
            case "C": d2 = "C传统型";break;
            case "E": d2 = "E管理型";break;
            case "S": d2 = "S社会型";break;
            case "A": d2 = "A艺术型";break;
            case "I": d2 = "I研究型";break;
            default:break;
        }
        switch (d3){
            case "R": d3 = "R现实型";break;
            case "C": d3 = "C传统型";break;
            case "E": d3 = "E管理型";break;
            case "S": d3 = "S社会型";break;
            case "A": d3 = "A艺术型";break;
            case "I": d3 = "I研究型";break;
            default:break;
        }
        //通过service进行分别的查询
        g_hld1 hld1 = hld1Service.getHld1(d1);
        System.out.println(hld1);
        g_hld1 hld11 = hld1Service.getHld1(d2);
        System.out.println(hld11);
        g_hld1 hld12 = hld1Service.getHld1(d3);
        System.out.println(hld12);

        //查询hld2的数据
        g_hld2 hld2 = hld2Service.getHld2(dimension);
        System.out.println(hld2);


        pdfUtils utils = new pdfUtils();
        Map<String, Object> map = utils.setHldPDF(R, C, E, S, A, I, d1, d2, d3, hld1, hld11, hld12, hld2);

        Document document = (Document) map.get("document");
        ByteArrayOutputStream  stream = (ByteArrayOutputStream) map.get("stream");


        //转化成流 直接输出
        resp.setHeader("Content-Disposition", "attachment; filename=" + new String((dimension + ".pdf").getBytes(), StandardCharsets.ISO_8859_1));
        resp.setContentLength(stream.size());

        ServletOutputStream streamOut = resp.getOutputStream();

        stream.writeTo(streamOut);


        return "ok";
    }



}

代码的细小但重要的代码

ByteArrayOutputStream stream = new ByteArrayOutputStream();
//创建一个新的文档
//创建一个空的文档并且设置文档的大小
Document document = new Document(PageSize.A4);

PdfWriter.getInstance(document, stream);

注意这里有个stream流，将pdf转化成流

在这个程序流是在写到网页的时候所需要的

Document document = (Document) map.get("document");
       ByteArrayOutputStream  stream = (ByteArrayOutputStream) map.get("stream");


       //转化成流 直接输出
       resp.setHeader("Content-Disposition", "attachment; filename=" + new String((dimension + ".pdf").getBytes(), StandardCharsets.ISO_8859_1));
       resp.setContentLength(stream.size());

       ServletOutputStream streamOut = resp.getOutputStream();

       stream.writeTo(streamOut);

这里就拿到了util方法生成的流和文档 将这个流直接通过springMVC中的HttpService直接将我们的流写到网页上生成文档。

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