[Java] Java使用iTextPDF生成PDF文件的实现方法

<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.10</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>

• 创建文档实例 Document
• 获取PdfWriter实例 （需要指定Document实例 和pdf 生成的磁盘路径）
• 打开文档
• 添加段落内容
• 关闭操作文档实例 （操作完成后必须执行文档关闭操作）
  

public class PdfUtil {
// 标准字体
public static Font NORMALFONT;
// 加粗字体
public static Font BOLDFONT;
//固定高
public static float fixedHeight = 27f;
//间距
public static int spacing = 5;
 
static {
try {
BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
NORMALFONT = new Font(bfChinese, 10, Font.NORMAL);
BOLDFONT = new Font(bfChinese, 14, Font.BOLD);
} catch (Exception e) {
e.printStackTrace();
}
 
}
 
public static Document createDocument() {
//生成pdf
Document document = new Document();
// 页面大小
Rectangle rectangle = new Rectangle(PageSize.A4);
// 页面背景颜色
rectangle.setBackgroundColor(BaseColor.WHITE);
document.setPageSize(rectangle);
// 页边距 左，右，上，下
document.setMargins(20, 20, 20, 20);
return document;
}
 
/**
* @param text 段落内容
* @return
*/
public static Paragraph createParagraph(String text, Font font) {
Paragraph elements = new Paragraph(text, font);
elements.setSpacingBefore(5);
elements.setSpacingAfter(5);
elements.setSpacingAfter(spacing);
return elements;
}
 
public static Font createFont(int fontNumber, int fontSize, BaseColor fontColor) {
//中文字体 ----不然中文会乱码
BaseFont bf = null;
try {
bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
return new Font(bf, fontNumber, fontSize, fontColor);
} catch (Exception e) {
e.printStackTrace();
}
return new Font(bf, Font.DEFAULTSIZE, Font.NORMAL, BaseColor.BLACK);
}
 
/**
* 隐藏表格边框线
*
* @param cell 单元格
*/
public static void disableBorderSide(PdfPCell cell) {
if (cell != null) {
cell.disableBorderSide(1);
cell.disableBorderSide(2);
cell.disableBorderSide(4);
cell.disableBorderSide(8);
}
}
 
/**
* 创建居中得单元格
*
* @return
*/
public static PdfPCell createCenterPdfPCell() {
PdfPCell cell = new PdfPCell();
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
cell.setFixedHeight(fixedHeight);
return cell;
}
 
/**
* 创建指定文字得单元格
*
* @param text
* @return
*/
public static PdfPCell createCenterPdfPCell(String text, int rowSpan, int colSpan, Font font) {
PdfPCell cell = new PdfPCell(new Paragraph(text, font));
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
cell.setHorizontalAlignment(Element.ALIGN_LEFT);
cell.setFixedHeight(fixedHeight);
cell.setRowspan(rowSpan);
cell.setColspan(colSpan);
return cell;
}
 
/**
* @param len 表格列数
* @return
*/
public static PdfPTable createPdfPTable(int len) {
PdfPTable pdfPTable = new PdfPTable(len);
pdfPTable.setSpacingBefore(5);
pdfPTable.setHorizontalAlignment(Element.ALIGN_CENTER);
return pdfPTable;
}
}

/**
* @author Wang Guolong
* @version 1.0
* @date 2020/6/28 3:17 下午
*/
@RestController
@RequestMapping("/pdf")
public class PdfController {
 
@RequestMapping("/generate")
public Response generatePDF(HttpServletResponse response) throws Exception {
String filename = "测试pdf";
// 设置下载格式为pdf
response.setContentType("application/x-download");
response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8") + ".pdf");
OutputStream os = new BufferedOutputStream(response.getOutputStream());
 
// 1. Document document = new Document();
Document document = PdfUtil.createDocument();
// 2. 获取writer
PdfWriter.getInstance(document, os);
// 3. open()
document.open();
 
//设置字体
Font blackFont = PdfUtil.createFont(10, Font.NORMAL, BaseColor.BLACK);
Font blueFont = PdfUtil.createFont(10, Font.NORMAL, BaseColor.BLUE);
Font bigFont = PdfUtil.createFont(14, Font.NORMAL, BaseColor.BLACK);
Font littleFont = PdfUtil.createFont(10, Font.NORMAL, BaseColor.BLACK);
 
Paragraph title = PdfUtil.createParagraph("测试pdf", bigFont);
title.setAlignment(Element.ALIGN_CENTER);
// 4. 添加段落内容
document.add(title);
// 5. close()
document.close();
os.close();
return new Response().setContent("success");
}
}