paohaijiao

Posted on Oct 22

Plotting a Four-Year Credit Trend Line Chart in a PDF Report

#java #pdf #opensource #tutorial

jquick-pdf by example — demo #2 of 184. Every article in this series ships one complete, runnable demo: a template file and a Java class. No snippets, no omissions.

Management wants revenue and net profit on one timeline to judge whether the credit portfolio is improving.

This document belongs to the Credit report — chart series set. Like every demo in the series it has its own colour scheme and layout combination, derived deterministically from the demo number — so the look is stable across runs and two neighbouring documents never look alike.

What you'll build

A PDF written to creditreport/02_line.pdf
A template file (report/credit_report_02_line.txt) with 1 bound placeholder
A detail grid of 6 rows × 6 columns, laid out with width:100% so it fills the text area
One self-contained Java class (JQuickCreditReport02LineTest) that binds the data and renders the file

Bound placeholders

${svg}

Prerequisites

Java 8+ and one dependency — jquick-pdf is built on Apache PDFBox, not iText:

<dependency>
    <groupId>io.github.paohaijiao</groupId>
    <artifactId>jquick-pdfx</artifactId>
    <version>4.2.0</version>
</dependency>

Coordinates: io.github.paohaijiao:jquick-pdfx:4.2.0.

Step 1 — the template file

JPdfX is jquick-pdf's HTML-like template language. It lives in its own file (src/test/resources/report/credit_report_02_line.txt) instead of a Java string, so designers can edit it without touching code.

<pdf>
<body>
  <div style="marginBottom:18px; borderLeft:6px solid #00695C; paddingLeft:16px">
    <div style="display:flex; justifyContent:space-between; alignItems:center">
      <h1 style="width:360px; textAlignment:left; fontSize:20; color:#00695C; margin:0">'企业信用评级报告'</h1>
      <div style="width:220px; textAlignment:right">
        <p style="fontSize:10; color:#607d8b; margin:1px">'报告编号: CR-2023-08975'</p>
        <p style="fontSize:10; color:#607d8b; margin:1px">'评估日期: 2023年11月15日'</p>
      </div>
    </div>
    <p style="textAlignment:left; fontSize:10; color:#00695C; marginTop:6px; marginBottom:0">'评估机构: 四川省企业信用评估中心'</p>
  </div>

  <div style="marginBottom:18px">
    <h2 style="color:#00695C; fontSize:13; marginBottom:8px">'企业信息'</h2>
    <div style="display:flex; flexWrap:wrap">
      <div style="width:290px; margin:4px; padding:8px; backgroundColor:#f5f7f7; borderRadius:3px">
        <p style="fontSize:9; color:#00897B; margin:0">'统一信用代码'</p>
        <p style="fontSize:11; bold:true; marginTop:3px; marginBottom:0">'91110108MA01XX1234'</p>
      </div>
      <div style="width:290px; margin:4px; padding:8px; backgroundColor:#f5f7f7; borderRadius:3px">
        <p style="fontSize:9; color:#00897B; margin:0">'成立日期'</p>
        <p style="fontSize:11; bold:true; marginTop:3px; marginBottom:0">'2018年5月20日'</p>
      </div>
      <div style="width:290px; margin:4px; padding:8px; backgroundColor:#f5f7f7; borderRadius:3px">
        <p style="fontSize:9; color:#00897B; margin:0">'注册资本'</p>
        <p style="fontSize:11; bold:true; marginTop:3px; marginBottom:0">'1000万元人民币'</p>
      </div>
      <div style="width:290px; margin:4px; padding:8px; backgroundColor:#f5f7f7; borderRadius:3px">
        <p style="fontSize:9; color:#00897B; margin:0">'法定代表人'</p>
        <p style="fontSize:11; bold:true; marginTop:3px; marginBottom:0">'泡海椒'</p>
      </div>
      <div style="width:290px; margin:4px; padding:8px; backgroundColor:#f5f7f7; borderRadius:3px">
        <p style="fontSize:9; color:#00897B; margin:0">'所属行业'</p>
        <p style="fontSize:11; bold:true; marginTop:3px; marginBottom:0">'软件和信息技术服务业'</p>
      </div>
      <div style="width:290px; margin:4px; padding:8px; backgroundColor:#f5f7f7; borderRadius:3px">
        <p style="fontSize:9; color:#00897B; margin:0">'企业规模'</p>
        <p style="fontSize:11; bold:true; marginTop:3px; marginBottom:0">'中型（150-200人）'</p>
      </div>
    </div>
  </div>

  <div style="marginBottom:18px">
    <h2 style="color:#00695C; borderBottom:2px solid #00695C; paddingBottom:4px; fontSize:13; marginBottom:10px">'历年财务数据（单位：万元）'</h2>
    <table style="width:600px; fontSize:10; marginTop:8px">
      <tr>
        <th style="backgroundColor:#ffffff; color:#00695C; borderBottom:2px solid #00695C; padding:6px; textAlign:left">'财务指标'</th>
        <th style="backgroundColor:#ffffff; color:#00695C; borderBottom:2px solid #00695C; padding:6px; textAlign:right">'2020年'</th>
        <th style="backgroundColor:#ffffff; color:#00695C; borderBottom:2px solid #00695C; padding:6px; textAlign:right">'2021年'</th>
        <th style="backgroundColor:#ffffff; color:#00695C; borderBottom:2px solid #00695C; padding:6px; textAlign:right">'2022年'</th>
        <th style="backgroundColor:#ffffff; color:#00695C; borderBottom:2px solid #00695C; padding:6px; textAlign:right">'2023年'</th>
        <th style="backgroundColor:#ffffff; color:#00695C; borderBottom:2px solid #00695C; padding:6px; textAlign:right">'增长率'</th>
      </tr>
      <tr>
        <td style="padding:6px; textAlign:left; borderBottom:1px solid #e0e0e0; bold:true">'营业收入'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'8,560'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'12,340'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'18,920'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'25,680'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0; color:#00897B; bold:true">'+44.2%'</td>
      </tr>
      <tr>
        <td style="padding:6px; textAlign:left; borderBottom:1px solid #e0e0e0; bold:true">'净利润'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'1,240'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'2,150'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'3,890'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'5,420'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0; color:#00897B; bold:true">'+63.8%'</td>
      </tr>
      <tr>
        <td style="padding:6px; textAlign:left; borderBottom:1px solid #e0e0e0; bold:true">'总资产'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'15,800'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'22,450'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'31,200'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'42,800'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0; color:#00897B; bold:true">'+39.5%'</td>
      </tr>
      <tr>
        <td style="padding:6px; textAlign:left; borderBottom:1px solid #e0e0e0; bold:true">'净资产'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'9,200'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'13,800'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'19,500'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'26,400'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0; color:#00897B; bold:true">'+42.1%'</td>
      </tr>
      <tr>
        <td style="padding:6px; textAlign:left; borderBottom:1px solid #e0e0e0; bold:true">'毛利率'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'42.5%'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'45.8%'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'48.2%'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0">'51.6%'</td>
        <td style="padding:6px; textAlign:right; borderBottom:1px solid #e0e0e0; color:#00897B; bold:true">'+9.1%'</td>
      </tr>
    </table>
  </div>

  <div style="marginBottom:18px">
    <h2 style="color:#00695C; borderBottom:2px solid #00695C; paddingBottom:4px; fontSize:13; marginBottom:10px">'关键经营指标'</h2>
    <div style="display:flex; flexWrap:wrap">
      <div style="width:290px; margin:4px; padding:10px; backgroundColor:#e0f2f1; borderRadius:4px">
        <p style="fontSize:11; margin:0">'营收增长率:连续三年保持40%以上增长，2023年达到25,680万元'</p>
      </div>
      <div style="width:290px; margin:4px; padding:10px; backgroundColor:#e0f2f1; borderRadius:4px">
        <p style="fontSize:11; margin:0">'利润率提升:净利率从14.5%提升至21.1%，盈利能力显著增强'</p>
      </div>
      <div style="width:290px; margin:4px; padding:10px; backgroundColor:#e0f2f1; borderRadius:4px">
        <p style="fontSize:11; margin:0">'研发投入:研发费用年均增长38.9%，占营收比例达13.3%'</p>
      </div>
      <div style="width:290px; margin:4px; padding:10px; backgroundColor:#e0f2f1; borderRadius:4px">
        <p style="fontSize:11; margin:0">'人才结构:技术研发人员占比42%，硕士以上学历占35%'</p>
      </div>
      <div style="width:290px; margin:4px; padding:10px; backgroundColor:#e0f2f1; borderRadius:4px">
        <p style="fontSize:11; margin:0">'客户质量:服务15家上市公司，客户续约率92%，大客户满意度4.8/5.0'</p>
      </div>
      <div style="width:290px; margin:4px; padding:10px; backgroundColor:#e0f2f1; borderRadius:4px">
        <p style="fontSize:11; margin:0">'资产质量:资产负债率维持在38%左右，流动比率2.8，偿债能力良好'</p>
      </div>
    </div>
  </div>

  <div style="marginBottom:18px">
    <h2 style="color:#00695C; borderBottom:2px solid #00695C; paddingBottom:4px; fontSize:13; marginBottom:10px">'信用评级趋势折线图'</h2>
    <div style="display:flex; justifyContent:center">
      <svg style="width:460px;height:400px">${svg}</svg>
    </div>
    <div style="display:flex; justifyContent:space-around; marginTop:10px">
      <p style="width:150px; fontSize:10; color:#00695C; margin:0">'财务状况(90分): 营收稳定增长'</p>
      <p style="width:150px; fontSize:10; color:#00695C; margin:0">'经营能力(95分): 客户留存率高'</p>
      <p style="width:150px; fontSize:10; color:#00695C; margin:0">'偿债能力(85分): 负债率合理'</p>
      <p style="width:150px; fontSize:10; color:#00695C; margin:0">'发展潜力(92分): 研发投入增加'</p>
    </div>
  </div>

  <div style="marginBottom:18px; borderLeft:6px solid #009688; paddingLeft:14px">
    <h2 style="color:#00695C; fontSize:13; marginBottom:8px">'综合评价'</h2>
    <p style="fontSize:11; margin:0">
      '四川省泡海椒科技有限公司作为国家级高新技术企业和专精特新"小巨人"企业，在云计算和大数据领域表现出色。'
      '公司财务状况健康，经营能力突出，技术创新能力强，具备良好的发展潜力。信用评级为AAA级，展望稳定。'
    </p>
  </div>

  <div style="display:flex; justifyContent:space-between; marginTop:18px; paddingTop:10px; borderTop:1px solid #b2dfdb">
    <div style="width:500px">
      <p style="fontSize:9; color:#607d8b; margin:0">'本报告依据公开信息和专业评估模型生成，仅供参考 | 报告生成时间: 2025年09月06日'</p>
      <p style="fontSize:9; color:#607d8b; margin:0">'© 2023 企业信用评估中心 版权所有 | 认证编号: CE-2023-001'</p>
    </div>
    <div style="width:120px; textAlignment:right">
      <p style="fontSize:9; color:#00897B; margin:0">'CE-2023-001'</p>
    </div>
  </div>
</body>
</pdf>

Step 2 — the Java class

jquick-pdfx/src/test/java/com/github/paohaijiao/biz/report/JQuickCreditReport02LineTest.java

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright (c) [2025-2099] Martin (goudingcheng@gmail.com)
 */
package com.github.paohaijiao.biz.report;

import com.github.paohaijiao.JOption;
import com.github.paohaijiao.axis.JCategoryAxis;
import com.github.paohaijiao.axis.JValueAxis;
import com.github.paohaijiao.code.JTrigger;
import com.github.paohaijiao.config.JPdfConfig;
import com.github.paohaijiao.demo.constant.JQuickConstant;
import com.github.paohaijiao.enums.JChartType;
import com.github.paohaijiao.executor.JQuickPdfFactory;
import com.github.paohaijiao.factory.JChartRendererFactory;
import com.github.paohaijiao.series.JLine;
import org.junit.Test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 统一信用报告 —— 风格 02：折线图（墨绿）
 *
 * <p>以 {@code report/credit_report_02_line.txt} 为模板，把折线图渲染成 SVG 后
 * 绑定到模板中的 {@code ${svg}} 占位符，输出到 {@code D:\test\creditreport\02_line.pdf}。</p>
 *
 * @author Martin
 * @version 1.0.0
 */
public class JQuickCreditReport02LineTest {

    public static final String path = JQuickConstant.path;

    @Test
    public void report02Line() throws IOException {
        JOption option = new JOption();
        option.title().text("信用评级趋势").subtext("2020-2023年度（单位：万元）");
        option.tooltip().trigger(JTrigger.axis);
        JCategoryAxis xAxis = new JCategoryAxis();
        xAxis.data("2020年", "2021年", "2022年", "2023年");
        option.xAxis(xAxis);
        option.yAxis(new JValueAxis());
        JLine revenue = new JLine();
        revenue.name("营业收入").data(8560, 12340, 18920, 25680);
        JLine profit = new JLine();
        profit.name("净利润").data(1240, 2150, 3890, 5420);
        option.series(revenue, profit);

        String svg = JChartRendererFactory.renderChart(JChartType.LINE, option);

        File dir = new File(path + "creditreport");
        if (!dir.exists()) {
            dir.mkdirs();
        }
        FileOutputStream fileOutputStream = new FileOutputStream(path + "creditreport/02_line.pdf");
        JPdfConfig config = new JPdfConfig();
        // 开启 flex 行布局：图表与其右侧的指标说明面板在宽度允许时并排，而不是换行堆叠。
        config.getLayoutConfig().setFlexLayout(true);
        JQuickPdfFactory factory = new JQuickPdfFactory(config);
        factory.bind("svg", svg);
        byte[] bytes = factory.executeResource("report/credit_report_02_line.txt");
        fileOutputStream.write(bytes);
        fileOutputStream.close();
    }
}

Step 3 — run it

The class is a JUnit test, so run it with Maven:

mvn -pl jquick-pdfx test -Dtest=JQuickCreditReport02LineTest

…or call the test method from a main wrapper if you want a plain entry point:

public static void main(String[] args) throws Exception {
    new JQuickCreditReport02LineTest().report02Line();
}

Output: 02_line.pdf

How it works

Binding a chart SVG into the template

The chart is not a bitmap — JChartRendererFactory.renderChart(...) returns an SVG string, and the template embeds it with a single <svg> element bound to ${svg}. That means the chart stays vector-sharp at any zoom level, and it participates in normal flow layout instead of being stamped on top of the page.

Declare only the width on <svg>; the height is derived from the chart's aspect ratio, so the chart never stretches vertically.
Open config.getLayoutConfig().setFlexLayout(true) if the template centers the chart with display:flex.
Bind the SVG string with factory.bind("svg", svg) — bind() is pure data injection and never re-parses markup.

String svg = JChartRendererFactory.renderChart(JChartType.LINE, option);
JQuickPdfFactory factory = new JQuickPdfFactory(config);
factory.bind("svg", svg);
byte[] bytes = factory.executeResource(TEMPLATE);

Making the table fill the text area

Tables default to content width, which leaves a ragged right margin on a formal document. Setting width:100% on the <table> makes it span the full text area; percentage widths on the first row's cells then distribute the remaining space across columns.

Set width:100% on <table> and give explicit widths only to the leading columns.
Label columns need around 100px so labels like Taxpayer ID do not wrap.
Leave the last column without a width so it absorbs rounding remainder.

<table style="width:100%; fontSize:9pt">
  <tr>
    <td style="width:100px; padding:5px">'Taxpayer ID'</td>
    <td style="padding:5px">${taxNo}</td>
  </tr>
</table>

Template syntax cheat sheet

Syntax	Meaning
`<td style="padding:4px; border:1px solid #C3CDD8">`	Cell styling. A `<td>` holds text only — no nested blocks.
`factory.bind("k", v)`	Injects plain text into the context; markup inside a value is dropped.
`'literal text'`	A single-quoted string is a literal — whatever is inside is printed verbatim.
`${var}`	An expression. It must sit outside the quotes: `'No: '${docNo}`.
`<table style="width:100%">`	Spans the full text area; give explicit widths only to the leading columns.

Gotchas worth remembering

Compute money with BigDecimal, round once, and derive 大写 from the rounded value.
Flex children whose fixed widths exceed the text area wrap instead of sitting side by side.
${var} must sit outside single quotes — 'No: ${docNo}' prints the placeholder literally.
<image src="..."> never evaluates ${...}; write a literal path.

Output

Wrap up

You now have a template file, a Java class and a PDF — all three reproducible from a clean clone. Swap the placeholder blocks for real data (or for real seal images) and the layout does not move.

Series navigation: ← #1 Rendering a Credit-Rating Distribution Bar Chart into PDF...　·　#3 Building an Area Chart for Credit Coverage Trends →

Full index: README.md　·　Source: jquick-pdf

Appendix — files in this demo

Role	Path
Java class	`jquick-pdfx/src/test/java/com/github/paohaijiao/biz/report/JQuickCreditReport02LineTest.java`
Template	`jquick-pdfx/src/test/resources/report/credit_report_02_line.txt`
Output PDF	`02_line.pdf`
Preview image	`images/02.png`

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