导出PDF-demo

quality-review/src/main/java/com/ruoyi/service/BookService.java

 package com.ruoyi.service;
 
+import com.itextpdf.text.Document;
 import com.ruoyi.domain.Book;
 import com.baomidou.mybatisplus.extension.service.IService;
 import org.apache.skywalking.apm.toolkit.trace.Tag;
 import org.apache.skywalking.apm.toolkit.trace.Tags;
 import org.apache.skywalking.apm.toolkit.trace.Trace;
 
+import javax.servlet.http.HttpServletResponse;
+import java.io.OutputStream;
 import java.util.List;
 
 /**
@@ -19,4 +22,19 @@ public interface BookService extends IService<Book> {
 
     List<Book> selectBookListException(String name);
 
+
+    /**
+     * 生成PDF
+     * @param os
+     * @return
+     * @throws Exception
+     */
+    Document generateItextPdfDocument(OutputStream os) throws Exception;
+
+    /**
+     * 以模板生成
+     * @param response
+     * @throws Exception
+     */
+    void generateTempPDF(HttpServletResponse response) throws Exception;
 }

quality-review/src/main/java/com/ruoyi/service/impl/BookServiceImpl.java

 package com.ruoyi.service.impl;
 
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.itextpdf.text.*;
+import com.itextpdf.text.pdf.*;
+import com.itextpdf.text.pdf.codec.Base64;
 import com.ruoyi.common.exception.ServiceException;
+import com.ruoyi.common.utils.PdfUtils;
 import com.ruoyi.domain.Book;
 import com.ruoyi.service.BookService;
 import com.ruoyi.mapper.BookMapper;
@@ -9,9 +13,19 @@ import org.apache.skywalking.apm.toolkit.trace.Tag;
 import org.apache.skywalking.apm.toolkit.trace.Tags;
 import org.apache.skywalking.apm.toolkit.trace.Trace;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
 import org.springframework.stereotype.Service;
 
+import javax.servlet.ServletOutputStream;
+import javax.servlet.http.HttpServletResponse;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 /**
 * @author wangfei
@@ -38,6 +52,178 @@ public class BookServiceImpl extends ServiceImpl<BookMapper, Book> implements Bo
         }
         return null;
     }
+
+    @Override
+    public Document generateItextPdfDocument(OutputStream os) throws Exception {
+        // document
+        Document document = new Document(PageSize.A4);
+        PdfWriter.getInstance(document, os);
+
+        // open
+        document.open();
+
+        // add content - pdf meta information
+        document.addAuthor("pdai");
+        document.addCreationDate();
+        document.addTitle("pdai-pdf-itextpdf");
+        document.addKeywords("pdf-pdai-keyword");
+        document.addCreator("pdai");
+
+        // add content -  page content
+
+        // Title
+        document.add(PdfUtils.createTitle("Java 全栈知识体系"));
+
+        // Chapter 1
+        document.add(PdfUtils.createChapterH1("1. 知识准备"));
+        document.add(PdfUtils.createChapterH2("1.1 什么是POI"));
+        document.add(PdfUtils.createParagraph("Apache POI 是创建和维护操作各种符合Office Open XML（OOXML）标准和微软的OLE 2复合文档格式（OLE2）的Java API。用它可以使用Java读取和创建,修改MS Excel文件.而且,还可以使用Java读取和创建MS Word和MSPowerPoint文件。更多请参考[官方文档](https://poi.apache.org/index.html)"));
+        document.add(PdfUtils.createChapterH2("1.2 POI中基础概念"));
+        document.add(PdfUtils.createParagraph("生成xls和xlsx有什么区别？POI对Excel中的对象的封装对应关系？"));
+
+        // Chapter 2
+        document.add(PdfUtils.createChapterH1("2. 实现案例"));
+        document.add(PdfUtils.createChapterH2("2.1 用户列表示例"));
+        document.add(PdfUtils.createParagraph("以导出用户列表为例"));
+
+        // 表格
+        PdfPTable table = new PdfPTable(new float[]{20, 40, 50, 40, 40});
+        table.setTotalWidth(500);
+        table.setLockedWidth(true);
+        table.setHorizontalAlignment(Element.ALIGN_CENTER);
+        table.getDefaultCell().setBorder(1);
+
+        for (int i = 0; i < 5; i++) {
+            table.addCell(PdfUtils.createCell("1"));
+            table.addCell(PdfUtils.createCell("2"));
+            table.addCell(PdfUtils.createCell("3"));
+            table.addCell(PdfUtils.createCell("4"));
+            table.addCell(PdfUtils.createCell("5"));
+        }
+        document.add(table);
+
+        document.add(PdfUtils.createChapterH2("2.2 图片导出示例"));
+        document.add(PdfUtils.createParagraph("以导出图片为例"));
+        // 图片
+        Image image = Image.getInstance("C:/Users/gxk/Pictures/Saved Pictures/nvm.png");
+        image.setAlignment(Element.ALIGN_CENTER);
+        // 缩放
+        image.scalePercent(60);
+        document.add(image);
+
+        // close
+        document.close();
+        return document;
+    }
+
+    @Override
+    public void generateTempPDF(HttpServletResponse response) throws Exception {
+        PdfReader reader = null;
+        PdfStamper ps = null;
+        OutputStream fos = null;
+        ByteArrayOutputStream bos = null;
+        Base64.InputStream fin = null;
+        ServletOutputStream out = null;
+        try {
+            // 模板绝对路径--服务器
+            String fileName = "/template/receipt_template.pdf";
+            // 读取现有模板内容
+            reader = new PdfReader(fileName);
+            // 创建输出流
+            bos = new ByteArrayOutputStream();
+            // 实例化PdfStamper准备编辑pdf内容
+            ps = new PdfStamper(reader, bos);
+
+            // 获取表单所有元素
+            AcroFields fields = ps.getAcroFields();
+
+            // 设置具体字体格式的编码, 不设置的话中文可能不会显示
+            BaseFont bf = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
+            fields.addSubstitutionFont(bf);
+
+            // 动态添加所需要的数据，key跟模板中对应文本域名称一致
+            Map<String, String> map = new HashMap<>();
+            map.put("code", "1234567890fjdksjfdsfdsffdsjfdssssssttttttttttttttt");
+            map.put("table_image", "C:/Users/gxk/Pictures/Saved Pictures/nvm.png");
+
+            // 渲染
+            fillData(fields, map, ps);
+
+            //必须要调用这个，否则文档不会生成的
+            ps.setFormFlattening(true);
+            if(ps != null){
+                ps.close();
+            }
+            //生成pdf路径存放的路径
+            fos = response.getOutputStream();
+            fos.write(bos.toByteArray());
+
+        }catch (Exception e){
+            e.printStackTrace();
+        }finally {
+            if(fos!=null){
+                fos.flush();
+                fos.close();
+            }
+            if (bos != null){
+                bos.close();
+            }
+            if(reader != null){
+                reader.close();
+            }
+        }
+    }
+
+    /**
+     * 填充模板中的数据
+     * @param fields
+     * @param data 是一个Map<String,String> 主要存储 key 表单模板中的单元格名 value为想要赋的值，遍历
+     * @param ps
+     */
+    public void fillData(AcroFields fields, Map<String, String> data, PdfStamper ps) {
+        try {
+            for (String key : data.keySet()) {
+                String value = data.get(key);
+                if (key.contains("image")) {
+                    addImageToPdf(key, fields, ps, value);
+                    continue;
+                }
+                // 为字段赋值,注意字段名称是区分大小写的
+                fields.setField(key, value);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 添加图片
+     * @param key 应为模板名
+     * @param form 动态字段
+     * @param stamper
+     * @param filePath 本地图片路径
+     * @throws DocumentException
+     * @throws IOException
+     * @throws IOException
+     */
+    private static void addImageToPdf(String key,AcroFields form, PdfStamper stamper, String filePath) throws DocumentException, IOException, IOException {
+
+        // 通过图片域名获取所在页和坐标，左下角为起点
+        int pageNo = form.getFieldPositions(key).get(0).page;
+        Rectangle signRect = form.getFieldPositions(key).get(0).position;
+        float x = signRect.getLeft();
+        float y = signRect.getBottom();
+
+        // 读图片
+        Image image = Image.getInstance(filePath);
+        // 获取操作的页面
+        PdfContentByte under = stamper.getOverContent(pageNo);
+        // 根据域的大小缩放图片
+        image.scaleToFit(signRect.getWidth() * 2, signRect.getHeight());
+        // 添加图片并设置位置（个人通过此设置使得图片垂直水平居中，可参考，具体情况已实际为准）
+        image.setAbsolutePosition(x, y);
+        under.addImage(image);
+    }
 }
 
 

quality-review/src/main/java/com/ruoyi/web/BookController.java

 package com.ruoyi.web;
 
+import com.itextpdf.text.Document;
+import com.ruoyi.common.annotation.Anonymous;
 import com.ruoyi.common.core.controller.BaseController;
 import com.ruoyi.common.core.domain.R;
 import com.ruoyi.common.core.page.TableDataInfo;
@@ -9,6 +11,7 @@ import com.ruoyi.web.request.BookDeleteRequest;
 import com.ruoyi.web.request.BookListRequest;
 import io.swagger.annotations.Api;
 import io.swagger.annotations.ApiOperation;
+import org.apache.poi.xwpf.usermodel.XWPFDocument;
 import org.apache.skywalking.apm.toolkit.trace.Tag;
 import org.apache.skywalking.apm.toolkit.trace.Tags;
 import org.apache.skywalking.apm.toolkit.trace.Trace;
@@ -16,6 +19,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
+import javax.servlet.http.HttpServletResponse;
+import java.io.OutputStream;
 import java.util.Arrays;
 import java.util.List;
 
@@ -73,4 +78,17 @@ public class BookController extends BaseController {
         return getDataTable(books);
     }
 
+    @Anonymous
+    @ApiOperation("Download")
+    @GetMapping(value = "/download", produces = "application/json")
+    public void download(HttpServletResponse response) {
+        response.setHeader("content-disposition","attachment;fileName="+"ReceiptPrinter.pdf");
+        try {
+//            bookService.generateItextPdfDocument(response.getOutputStream());
+            bookService.generateTempPDF(response);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
 }

ruoyi-common/pom.xml

@@ -158,6 +158,17 @@
             <version>3.0.3</version>
         </dependency>
 
+        <!-- PDF -->
+        <dependency>
+            <groupId>com.itextpdf</groupId>
+            <artifactId>itextpdf</artifactId>
+            <version>5.5.13.3</version>
+        </dependency>
+        <dependency>
+            <groupId>com.itextpdf</groupId>
+            <artifactId>itext-asian</artifactId>
+            <version>5.2.0</version>
+        </dependency>
     </dependencies>
 
 </project>

ruoyi-common/src/main/java/com/ruoyi/common/utils/PdfUtils.java

+package com.ruoyi.common.utils;
+
+import com.itextpdf.text.*;
+import com.itextpdf.text.pdf.BaseFont;
+import com.itextpdf.text.pdf.PdfPCell;
+
+import java.io.IOException;
+
+/**
+ * PDF工具类
+ * @author gxk
+ */
+public class PdfUtils {
+
+    /**
+     * 标题
+     * @param content
+     * @return
+     * @throws IOException
+     * @throws DocumentException
+     */
+    public static Paragraph createTitle(String content) throws IOException, DocumentException {
+        Font font = new Font(getBaseFont(), 24, Font.BOLD);
+        Paragraph paragraph = new Paragraph(content, font);
+        paragraph.setAlignment(Element.ALIGN_CENTER);
+        return paragraph;
+    }
+
+    /**
+     * H1标题
+     * @param content
+     * @return
+     * @throws IOException
+     * @throws DocumentException
+     */
+    public static Paragraph createChapterH1(String content) throws IOException, DocumentException {
+        Font font = new Font(getBaseFont(), 22, Font.BOLD);
+        Paragraph paragraph = new Paragraph(content, font);
+        paragraph.setAlignment(Element.ALIGN_LEFT);
+        return paragraph;
+    }
+
+    /**
+     * H2标题
+     * @param content
+     * @return
+     * @throws IOException
+     * @throws DocumentException
+     */
+    public static Paragraph createChapterH2(String content) throws IOException, DocumentException {
+        Font font = new Font(getBaseFont(), 18, Font.BOLD);
+        Paragraph paragraph = new Paragraph(content, font);
+        paragraph.setAlignment(Element.ALIGN_LEFT);
+        return paragraph;
+    }
+
+    /**
+     * 段
+     * @param content
+     * @return
+     * @throws IOException
+     * @throws DocumentException
+     */
+    public static Paragraph createParagraph(String content) throws IOException, DocumentException {
+        Font font = new Font(getBaseFont(), 12, Font.NORMAL);
+        Paragraph paragraph = new Paragraph(content, font);
+        paragraph.setAlignment(Element.ALIGN_LEFT);
+        // 设置左缩进
+        paragraph.setIndentationLeft(12);
+        // 设置右缩进
+        paragraph.setIndentationRight(12);
+        // 设置首行缩进
+        paragraph.setFirstLineIndent(24);
+        // 行间距
+        paragraph.setLeading(20f);
+        // 设置段落上空白
+        paragraph.setSpacingBefore(5f);
+        // 设置段落下空白
+        paragraph.setSpacingAfter(10f);
+        return paragraph;
+    }
+
+    /**
+     * 表格内容
+     * @param content
+     * @return
+     * @throws IOException
+     * @throws DocumentException
+     */
+    public static PdfPCell createCell(String content) throws IOException, DocumentException {
+        PdfPCell cell = new PdfPCell();
+        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
+        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
+        Font font = new Font(getBaseFont(), 12, Font.NORMAL);
+        cell.setPhrase(new Phrase(content, font));
+        return cell;
+    }
+
+    /**
+     * 字体
+     * @return
+     * @throws IOException
+     * @throws DocumentException
+     */
+    public static BaseFont getBaseFont() throws IOException, DocumentException {
+        return BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
+    }
+
+}