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Drawing PDF tables (I) drawing excel table styles in PDF and downloading them through iText (supporting Chinese fonts)
2022-07-25 17:50:00 【Suddenly】
Catalog
Preface
Encapsulating data as excel Table style , And take PDF Download in the form of , have access to Itextpdf To implement , You can also use it Aspose Through the conversion between streams , Reference resources ：
《SpringBoot Realization Excel、Word Convert to PDF》
《Aspose Upload Excel、Word Convert to PDF And download 》
1、 introduce POM
<dependencies>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>font-asian</artifactId>
<version>7.2.1</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.13.3</version>
</dependency>
</dependencies>
2、 find font
For Chinese Fonts textpdf Writing font names directly is not supported , So you need to specify it manually ttc perhaps ttf Type of font , Need to find the font location installed on this machine , such as ：C:\Windows\Fonts, The steps to find the font correctly are as follows ：
First step ： Get into C:\Windows\Fonts:
Enter the font installation directory ,Windows The default is C:\Windows\Fonts
The second step ： View font information
For example, we choose In black , So bold simsun.ttc
3、 Write a tool class
3.1 Font configuration
public class PdfUtils {
/** * Set the default font value * * @return * @throws DocumentException * @throws IOException */
private static BaseFont createBaseFont(String fontName) throws DocumentException, IOException {
// The default is Song typeface
if (fontName == null) {
fontName = "simsun.ttc";
}
String fontPre = fontName.substring(fontName.lastIndexOf(".") + 1);
if (fontPre.equals("ttc")) {
// ttc Format fonts need to be suffixed
fontName = fontName + ",0";
}
String font = FONT_PATH + fontName;
return BaseFont.createFont(font, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
}
/** * Set the font * * @return */
public static Font setFont() {
return setFont(null, null, null, null);
}
public static Font setFont(Integer fontSize) {
return setFont(null, fontSize, null, null);
}
public static Font setFont(Integer fontSize, BaseColor fontColor) {
return setFont(null, fontSize, null, fontColor);
}
/** * @param fontName Font name Default Arial * @param fontSize font size Default 12 Number * @param fontStyle Font style * @param fontColor The font color Default black * @return */
public static Font setFont(String fontName, Integer fontSize, Integer fontStyle, BaseColor fontColor) {
try {
BaseFont baseFont = createBaseFont(fontName);
Font font = new Font(baseFont);
if (fontSize != null) {
font.setSize(fontSize);
}
if (fontStyle != null) {
font.setStyle(fontStyle);
}
if (fontColor != null) {
font.setColor(fontColor);
}
return font;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(" Setting font failed ！");
}
}
}
3.2 establish pdf file
public class PdfUtils {
/** * The paper size */
private static Rectangle RECTANGLE = PageSize.A4;
/** * establish pdf file * * @param response * @param fileName * @return */
public static Document createDocument(HttpServletResponse response, String fileName) {
try {
response.reset();
response.setHeader("Content-Type", "application/pdf-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
} catch (Exception e) {
e.printStackTrace();
}
// Set size
RECTANGLE = PageSize.A4;
return new Document(RECTANGLE, 50, 50, 80, 50);
}
}
3.3 Create paragraph title
public class PdfUtils {
/** * Set table contents * * @param headFont * @param textFont * @param title * @param list * @return */
public static PdfPTable setTable(Font headFont, Font textFont, String[] title, List<User> list) {
// Four columns
PdfPTable table = createTable(new float[]{
120, 120, 120, 120});
for (String head : title) {
table.addCell(createCell(head, headFont));
}
for (User user : list) {
table.addCell(createCell(user.getName(), textFont));
table.addCell(createCell(user.getGender(), textFont));
table.addCell(createCell(Integer.toString(user.getAgx()), textFont));
table.addCell(createCell(user.getAddress(), textFont));
}
return table;
}
private static PdfPTable createTable(float[] widths) {
PdfPTable table = new PdfPTable(widths);
try {
// Set table size
table.setTotalWidth(RECTANGLE.getWidth() - 100);
table.setLockedWidth(true);
// In the middle
table.setHorizontalAlignment(Element.ALIGN_CENTER);
// Frame
table.getDefaultCell().setBorder(1);
} catch (Exception e) {
e.printStackTrace();
}
return table;
}
private static PdfPCell createCell(String value, Font font) {
PdfPCell cell = new PdfPCell();
// level 、 Vertical center
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
cell.setPhrase(new Phrase(value, font));
return cell;
}
}
3.4 Set up the form
public class PdfUtils {
/** * Draw the title * * @param font * @param titleName * @return */
public static Paragraph setParagraph(Font font, String titleName) {
Paragraph paragraph = new Paragraph(titleName, font);
// Center text
paragraph.setAlignment(Element.ALIGN_CENTER);
// Row spacing
paragraph.setLeading(5f);
// Set the space on the paragraph
paragraph.setSpacingBefore(-20f);
// Set the space below the paragraph
paragraph.setSpacingAfter(15f);
return paragraph;
}
}
3.5 Tool class complete code
public class PdfUtils {
/** * Font storage path , The default is 'C:\Windows\Fonts\' */
private static final String FONT_PATH = "C:\\Windows\\Fonts\\";
/** * The paper size */
private static Rectangle RECTANGLE = PageSize.A4;
/** * Set the default font value * * @return * @throws DocumentException * @throws IOException */
private static BaseFont createBaseFont(String fontName) throws DocumentException, IOException {
// The default is Song typeface
if (fontName == null) {
fontName = "simsun.ttc";
}
String fontPre = fontName.substring(fontName.lastIndexOf(".") + 1);
if (fontPre.equals("ttc")) {
// ttc Format fonts need to be suffixed
fontName = fontName + ",0";
}
String font = FONT_PATH + fontName;
return BaseFont.createFont(font, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
}
/** * Set the font * * @return */
public static Font setFont() {
return setFont(null, null, null, null);
}
public static Font setFont(Integer fontSize) {
return setFont(null, fontSize, null, null);
}
public static Font setFont(Integer fontSize, BaseColor fontColor) {
return setFont(null, fontSize, null, fontColor);
}
/** * @param fontName Font name Default Arial * @param fontSize font size Default 12 Number * @param fontStyle Font style * @param fontColor The font color Default black * @return */
public static Font setFont(String fontName, Integer fontSize, Integer fontStyle, BaseColor fontColor) {
try {
BaseFont baseFont = createBaseFont(fontName);
Font font = new Font(baseFont);
if (fontSize != null) {
font.setSize(fontSize);
}
if (fontStyle != null) {
font.setStyle(fontStyle);
}
if (fontColor != null) {
font.setColor(fontColor);
}
return font;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(" Setting font failed ！");
}
}
/** * establish pdf file * * @param response * @param fileName * @return */
public static Document createDocument(HttpServletResponse response, String fileName) {
try {
response.reset();
response.setHeader("Content-Type", "application/pdf-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
} catch (Exception e) {
e.printStackTrace();
}
// Set size
RECTANGLE = PageSize.A4;
return new Document(RECTANGLE, 50, 50, 80, 50);
}
/** * Draw the title * * @param font * @param titleName * @return */
public static Paragraph setParagraph(Font font, String titleName) {
Paragraph paragraph = new Paragraph(titleName, font);
// Center text
paragraph.setAlignment(Element.ALIGN_CENTER);
// Row spacing
paragraph.setLeading(5f);
// Set the space on the paragraph
paragraph.setSpacingBefore(-20f);
// Set the space below the paragraph
paragraph.setSpacingAfter(15f);
return paragraph;
}
/** * Set up * Form and content * * @param headFont * @param textFont * @param title * @param list * @return */
public static PdfPTable setTable(Font headFont, Font textFont, String[] title, List<User> list) {
// Four columns
PdfPTable table = createTable(new float[]{
120, 120, 120, 120});
for (String head : title) {
table.addCell(createCell(head, headFont));
}
for (User user : list) {
table.addCell(createCell(user.getName(), textFont));
table.addCell(createCell(user.getGender(), textFont));
table.addCell(createCell(Integer.toString(user.getAgx()), textFont));
table.addCell(createCell(user.getAddress(), textFont));
}
return table;
}
private static PdfPTable createTable(float[] widths) {
PdfPTable table = new PdfPTable(widths);
try {
// Set table size
table.setTotalWidth(RECTANGLE.getWidth() - 100);
table.setLockedWidth(true);
// In the middle
table.setHorizontalAlignment(Element.ALIGN_CENTER);
// Frame
table.getDefaultCell().setBorder(1);
} catch (Exception e) {
e.printStackTrace();
}
return table;
}
private static PdfPCell createCell(String value, Font font) {
PdfPCell cell = new PdfPCell();
// level 、 Vertical center
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
cell.setPhrase(new Phrase(value, font));
return cell;
}
}
4、pdf Build implementation
Code ：
@RestController
@RequestMapping("/test")
public class ExcelController {
@GetMapping("/pdf")
public void downloadPDF(HttpServletResponse response) {
try (BufferedOutputStream os = new BufferedOutputStream(response.getOutputStream())) {
// 1. Set the name of the output file
String fileName = " Attendance report .pdf";
// 2. establish pdf file , And set the paper size to A4
Document document = PdfUtils.createDocument(response, fileName);
PdfWriter.getInstance(document, os);
// 3. Open the document
document.open();
// 4. Set title
String titleName = " this individual yes mark topic ";
// Set the font style ： In black 20 Number In bold Red
Font titleFont = PdfUtils.setFont("simhei.ttf", 20, Font.BOLD, BaseColor.RED);
Paragraph paragraph = PdfUtils.setParagraph(titleFont, titleName);
// 5. Set up the form
// Define column names
String[] title = {
" full name ", " Gender ", " Age ", " Address "};
// Get list data
// Set header font style ： In black 14 Number In bold black
// Set body font style ：12 Number
Font headFont = PdfUtils.setFont("simhei.ttf", 12, Font.BOLD, BaseColor.BLACK);
Font textFont = PdfUtils.setFont(12);
// Analog data acquisition
List<User> dataList = getData();
PdfPTable table = PdfUtils.setTable(headFont, textFont, title, dataList);
// 8. Fill in the content
document.add(paragraph);
document.add(table);
// close resource
document.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/** * Simulate getting data from a database * * @return */
private List<User> getData() {
List<User> list = new ArrayList<>();
for (int i = 0; i < 100; i++) {
User user = new User();
user.setName(" name -" + i);
user.setAddress(" Address -" + i);
user.setAgx(20);
user.setGender(" male ");
list.add(user);
}
return list;
}
effect ：
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