生成pdf文字和表格
先看效果
介绍
java项目,使用apache的pdfbox工具,可分页,自定义列
依赖
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.22</version>
</dependency>
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>fontbox</artifactId><version>2.0.22</version>
</dependency>
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>xmpbox</artifactId><version>2.0.22</version>
</dependency>
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>preflight</artifactId><version>2.0.22</version>
</dependency>
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox-tools</artifactId><version>2.0.22</version>
</dependency>
基本使用的api
创建一个页面
String filePath = "D:\\imgTest\\test.pdf";PDDocument document = new PDDocument();PDPage page = new PDPage();document.addPage(page);document.save(new File(filePath));
执行后就可以在 D:\imgTest 目录下看到test.pdf 打开后有一个空白页
写入文字
PDDocument document = new PDDocument();PDFont font = PDType0Font.load(document,new File("D://imgtest/font/simfang.ttf"));PDPage page = new PDPage();PDPageContentStream contentStream = new PDPageContentStream(document, page);contentStream.beginText();contentStream.setFont(font,20.0f);contentStream.showText("写入文字");contentStream.endText();contentStream.close();document.addPage(page);document.save(new File(filePath));
但是可以看到文字在最后显示
文字从顶部写入
计算出page高度 文字高度 然后就得到了书写的位置
contentStream.newLineAtOffset(0,pageHeight - fontHeight);
PDDocument document = new PDDocument();PDFont font = PDType0Font.load(document,new File("D://imgtest/font/simfang.ttf"));PDPage page = new PDPage();float pageWidth = page.getMediaBox().getWidth();float pageHeight = page.getMediaBox().getHeight();float fontSize = 20.0f;float fontHeight = font.getFontDescriptor().getFontBoundingBox().getHeight() / 1000 * fontSize;float fontWidth = font.getAverageFontWidth() / 1000 * fontSize;PDPageContentStream contentStream = new PDPageContentStream(document, page);contentStream.beginText();contentStream.setFont(font,fontSize);contentStream.setLeading(10.0f);contentStream.newLineAtOffset(0,pageHeight - fontHeight);contentStream.showText("写入文字");contentStream.endText();contentStream.close();document.addPage(page);document.save(new File(filePath));
写入多行文字并自动换行
如果写入一段文字的时候,要自动换行,
现在我们知道一个文字的宽度,可以算出一行总共可以写多少文字,这样就知道多少行了然后每行写入就可以了
代码
PDDocument document = new PDDocument();PDFont font = PDType0Font.load(document,new File("D://imgtest/font/simfang.ttf"));PDPage page = new PDPage();float pageWidth = page.getMediaBox().getWidth();float pageHeight = page.getMediaBox().getHeight();float fontSize = 20.0f;float fontHeight = font.getFontDescriptor().getFontBoundingBox().getHeight() / 1000 * fontSize;float fontWidth = font.getAverageFontWidth() / 1000 * fontSize;int lineNum = (int)Math.floor(pageWidth/fontWidth);String text = "初升的太阳照耀大地,北部战区空军某雷达站营区披上了一层金色的外衣。祖国东极,一年中最冷的季节,这样的光,给人以希望和温暖。" +" 6时55分,上等兵孙野推开雷达方舱的大门,揉了揉酸痛的双眼,沐浴着第一缕阳光,脑海中浮现一句熟悉的歌词:“我把太阳迎进祖国。”迎接阳光,这是雷达兵最自豪的时刻。\n" +" 这一刻,一级军士长王传星带着“徒弟”走进方舱值班。在这位技术骨干心中,雷达兵的眼睛,就是祖国的眼睛,使命重如泰山,须臾不可懈怠。雷达屏幕上,闪烁的光标汇在一起,那是他和战友们心头永远的璀璨。\n" +" 这一刻,驾驶员刘磊再次出发踏上征程。一次次驾车行驶在熟悉的山路上,他陪伴着战友,也了解了很多不为人知的故事。守护着他们的坚强与坚韧,见证着他们的笑与泪,这位老兵决心成为战友身边和煦的光。\n" +" 这一刻,年轻骨干李航宇和李玉溪全副武装来到了曙光初照的训练场,备战即将来临的上级比武。为了心中的目标,他们把班长当作标杆;为了成为像班长那样的“光”,他们一往无前,奋力冲锋。\n" +" “我把太阳迎进祖国,太阳把光热洒给万里山河,我持枪向太阳致以军礼,请它也带上我的光、我的热……”\n" +" 新年来临,在这个边防雷达站,许多官兵都在守望中找到了属于自己的光。为梦想而追光,他们有怎样的收获和成长,又有怎样的期待和展望?请看来自祖国东极某雷达站的报道。\n" +" 下连之初,班长就曾对孙野说,雷达站驻地太阳升起的时间,比他的家乡福建早了一个多小时。作为东极雷达兵,每当阳光照耀大地,他们感受更多的是肩头的责任。\n" +" “阳光在哪里,坚守就在哪里。”在雷达站官兵心中,头上的阳光很暖,肩上的责任很重,脚下的路很长";PDPageContentStream contentStream = new PDPageContentStream(document, page);contentStream.beginText();contentStream.setFont(font,fontSize);contentStream.setLeading(fontHeight);List<String> textList = handleText(text,lineNum);contentStream.newLineAtOffset(0,pageHeight - fontHeight);for(int i=0;i<textList.size();i++){log.info(textList.get(i));contentStream.showText(textList.get(i));contentStream.newLine();}contentStream.endText();contentStream.close();document.addPage(page);document.save(new File(filePath));
注意换行写入使用的方法
contentStream.beginText();
contentStream.setFont(font,fontSize);
contentStream.setLeading(fontHeight);for ...{contentStream.showText(内容);contentStream.newLine();}
文字内容基本就是这样了,可以根据自己的方式添加padding 和 margin 也就是在pageWidth pageHeight 上进行调整
自己可以试试
表格
画一条横线和竖线
PDDocument document = new PDDocument();PDPage page = new PDPage();float pageWidth = page.getMediaBox().getWidth();float pageHeight = page.getMediaBox().getHeight();PDPageContentStream contentStream = new PDPageContentStream(document, page);contentStream.moveTo(0, pageHeight/2);//横线contentStream.lineTo(pageWidth, pageHeight/2);//横线contentStream.stroke();//横线contentStream.moveTo(pageWidth/2, pageHeight);//竖线contentStream.lineTo(pageWidth/2, 0);//竖线contentStream.stroke();//竖线contentStream.close();document.addPage(page);document.save(new File(filePath));
画一个简单的表格(10 X 5 的表格)
11 条横线 6条数线
这个只是为了画格子,长度和宽度都是自定的,如果写入文字的话就得考虑文字超出的问题,格子的长度和高度就不能是自定义的了
PDDocument document = new PDDocument();PDPage page = new PDPage();float pageWidth = page.getMediaBox().getWidth();float pageHeight = page.getMediaBox().getHeight();PDPageContentStream contentStream = new PDPageContentStream(document, page);float rowNum = (pageHeight - 20) / 10;float colNum = (pageWidth - 20) / 6;for (int i = 0; i <= 11; i++) {float row = pageHeight - 10 - i * rowNum;contentStream.moveTo(10, row);contentStream.lineTo(pageWidth - 10, row);contentStream.stroke();}for (int i = 0; i <= 6; i++) {float col = pageWidth - 10 - i * colNum;contentStream.moveTo(col, 10);contentStream.lineTo(col, pageHeight - 10);contentStream.stroke();}contentStream.close();document.addPage(page);document.save(new File(filePath));
表格中写入文字
考虑一个问题,先画表格还是先写文字
其实都可以
主要的问题是要考虑 一行中,每个列 文字的长度,如果换行的话 文字的高度和最高的那一列,找到这个最高值就知道这一行最下面边的位置了
完整代码
因为内容比较多,单独封装了一个类
@Slf4j
class Table {private float fontWidth;private float fontHeight;private float pageHeight;private float pageWidth;private PDPageContentStream contentStream;private PDFont font;private float padding = 2f;private float pageMargin = 10f;private float fontSize = 20.0f;private String[] header;private int[] cellSpan;private PDPage page;private float courY;private float leading = 20f;private List<String[]> contexts;private float[] cellWidth;private float[] courXPosion;public Table(PDPage page, PDPageContentStream contentStream, PDFont font, int[] cellSpan, String[] header, List<String[]> contexts) {this.contentStream = contentStream;this.page = page;this.font = font;this.pageWidth = this.page.getMediaBox().getWidth();this.pageHeight = this.page.getMediaBox().getHeight();this.fontHeight = font.getFontDescriptor().getFontBoundingBox().getHeight() / 1000f * fontSize;this.fontWidth = font.getAverageFontWidth() / 1000f * fontSize;this.courY = pageHeight - pageMargin;this.header = header;this.cellSpan = cellSpan;this.contexts = contexts;courXPosion = new float[header.length + 1];cellWidth = new float[header.length];courXPosion[0] = pageMargin;for (int i = 0; i < cellSpan.length; i++) {float width = (pageWidth - pageMargin * 2) * (cellSpan[i] / 100f);courXPosion[i + 1] = courXPosion[i] + width;cellWidth[i] = width;}contexts.add(0, header);}public void createTable() throws IOException {//画第一条横线contentStream.moveTo(pageMargin, courY);contentStream.lineTo(pageWidth - pageMargin, courY);contentStream.stroke();//填充内容for (int i = 0; i < contexts.size(); i++) {courY = courY - padding - fontHeight;String[] rows = contexts.get(i);handleData(rows);}//统一画竖线 最后画就可以for (int i = 0; i < courXPosion.length; i++) {contentStream.moveTo(courXPosion[i], pageHeight - pageMargin);contentStream.lineTo(courXPosion[i], courY);contentStream.stroke();}}public void handleData(String[] data) throws IOException {int maxLineNum = 1;float courX = pageMargin + padding;for (int i = 0; i < data.length; i++) {int lineNum = writeText(data[i], cellWidth[i] - padding * 2, courX);maxLineNum = lineNum > maxLineNum ? lineNum : maxLineNum;courX = courX + cellWidth[i];}courY = courY - padding - fontHeight * (maxLineNum - 1 ) - leading * (20f / 72f);contentStream.moveTo(pageMargin, courY);contentStream.lineTo(pageWidth - pageMargin, courY);contentStream.stroke();}public int writeText(String text, float cellWidth, float x) throws IOException {int lineNum = (int) Math.floor(cellWidth / fontWidth);List<String> textList = handleText(text, lineNum);contentStream.beginText();contentStream.setFont(font, fontSize);contentStream.setLeading(leading);contentStream.newLineAtOffset(x, courY);for (int i = 0; i < textList.size(); i++) {//log.info(textList.get(i));contentStream.showText(textList.get(i));contentStream.newLine();}contentStream.endText();return textList.size();}public List<String> handleText(String text, int lineNum) {text = text.replace("\n", "");text = StringUtils.deleteWhitespace(text);List<String> list = new ArrayList<>();if (text.length() <= lineNum) {list.add(text);return list;}while (text.length() > lineNum) {list.add(text.substring(0, lineNum));text = text.substring(lineNum);}if (text.length() > 0) {list.add(text);}return list;}
}
测试调用
@Testpublic void test6() throws IOException {PDDocument document = new PDDocument();PDPage page = new PDPage();PDFont font = PDType0Font.load(document, new File("D://imgtest/font/simfang.ttf"));PDPageContentStream contentStream = new PDPageContentStream(document, page);//组装内容String[] header = new String[]{"序号", "名称", "作者", "时间", "内容"};List<String[]> listText =IntStream.range(0, 2).mapToObj(row ->new String[]{String.valueOf(row + 1),"《沁园春·雪》","毛泽东","1936","北国风光,千里冰封,万里雪飘。望长城内外,惟余莽莽;大河上下,顿失滔滔。山舞银蛇,原驰蜡象,欲与天公试比高。须晴日,看红装素裹,分外妖娆。江山如此多娇,引无数英雄竞折腰。惜秦皇汉武,略输文采;唐宗宋祖,稍逊风骚。一代天骄,成吉思汗,只识弯弓射大雕。俱往矣,数风流人物,还看今朝。"}).collect(Collectors.toList());//提前设置好列比例,可以自己调整,只要保证最后是100就行int[] cellSpan = {10, 25, 15, 15, 35};Table table = new Table(page, contentStream, font, cellSpan, header, listText);table.createTable();contentStream.close();document.addPage(page);document.save(new File(filePath));}
效果展示
最后
好了以上就是完整的代码和测试用例,当然还有比较多的问题
比如
- 如果这一页满了该怎么办?
- 如果要水平和垂直居中
- 比如要插入图片
有需要的小伙伴可以私信讨论,或者回复索要代码