springboot项目：导出pdf文件

• 上一篇文章，我们说了一个生成pdf，这次我们再web项目中导出pdf文件

1、导入依赖

       <dependency>
            <groupId>com.lowagie</groupId>
            <artifactId>itext</artifactId>
            <version>2.1.7</version>
        </dependency>

<!--         https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.13</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

2、实体类

package com.example.demo.entity;

import lombok.Data;

/**
 * @ClassName Product
 * @Description
 * @Author 戴书博
 * @Date 2019/11/19 22:51
 * @Version 1.0
 **/
@Data
public class Product {

    private String productName;

    private String productCode;

    private float price;

    public Product(String productName,String productCode,float price){
        this.productName = productName;
        this.productCode = productCode;
        this.price = price;
    }
}

3、controller

package com.example.demo.controller;

import com.example.demo.entity.Product;
import com.example.demo.entity.ViewPDF;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @ClassName PrintPdfController
 * @Description
 * @Author 戴书博
 * @Date 2019/11/19 22:52
 * @Version 1.0
 **/
@Controller
@RequestMapping("/")
public class PrintPdfController {

    @RequestMapping("printPdf")
    public ModelAndView printPdf(){
        Product product1 = new Product("产品一","cp01",120);
        Product product2 = new Product("产品一","cp01",120);
        Product product3 = new Product("产品一","cp01",120);
        List<Product> products = new ArrayList<>();
        products.add(product1);
        products.add(product2);
        products.add(product3);
        Map<String, Object> model = new HashMap<>();
        model.put("sheet", products);
        return new ModelAndView(new ViewPDF(), model);
    }
}

4、工具类

package com.example.demo.util;

import com.example.demo.entity.Product;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Font;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;

/**
 * @ClassName PdfUtil
 * @Description
 * @Author 戴书博
 * @Date 2019/11/19 23:09
 * @Version 1.0
 **/
public class PdfUtil {

    public void createPDF(Document document, PdfWriter writer, List<Product> products) throws IOException {
        //Document document = new Document(PageSize.A4);
        try {
            document.addTitle("sheet of product");
            document.addAuthor("scurry");
            document.addSubject("product sheet.");
            document.addKeywords("product.");
            document.open();
            PdfPTable table = createTable(writer,products);
            document.add(table);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        } finally {
            document.close();
        }
    }
    public static PdfPTable createTable(PdfWriter writer,List<Product> products) throws IOException, DocumentException {
        PdfPTable table = new PdfPTable(3);//生成一个两列的表格
        PdfPCell cell;
        int size = 20;
        Font font = new Font(BaseFont.createFont("C://Windows//Fonts//simfang.ttf", BaseFont.IDENTITY_H,
                BaseFont.NOT_EMBEDDED));
        for(int i = 0;i<products.size();i++) {
            cell = new PdfPCell(new Phrase(products.get(i).getProductCode(),font));//产品编号
            cell.setFixedHeight(size);
            table.addCell(cell);
            cell = new PdfPCell(new Phrase(products.get(i).getProductName(),font));//产品名称
            cell.setFixedHeight(size);
            table.addCell(cell);
            cell = new PdfPCell(new Phrase(products.get(i).getPrice()+"",font));//产品价格
            cell.setFixedHeight(size);
            table.addCell(cell);
        }
        return table;
    }
}

5、PDF类

package com.example.demo.entity;

import com.example.demo.util.PdfUtil;
import com.lowagie.text.Document;
import com.lowagie.text.pdf.PdfWriter;
import org.springframework.web.servlet.view.document.AbstractPdfView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * @ClassName ViewPDF
 * @Description
 * @Author 戴书博
 * @Date 2019/11/19 22:56
 * @Version 1.0
 **/
public class ViewPDF  extends AbstractPdfView {

    @Override
    protected void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer,
                                    HttpServletRequest request, HttpServletResponse response) throws Exception {
        // 设置response方式,使执行此controller时候自动出现下载页面,而非直接使用excel打开
        String fileName = new Date().getTime()+"_quotation.pdf";
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/pdf");
//        response.setHeader("Content-Disposition","filename=" + new String(fileName.getBytes(), "iso8859-1"));
//直接下载
        response.setHeader("Content-Disposition","attachment;filename=" + new String(fileName.getBytes(), "iso8859-1"));
        List<Product> products = (List<Product>) model.get("sheet");
        PdfUtil pdfUtil = new PdfUtil();
        pdfUtil.createPDF(document, writer, products);
    }
}

注意问题

• 这里的Document对象是import com.lowagie.text.Document;
• 当请求头是： response.setHeader(“Content-Disposition”,“filename=” + new String(fileName.getBytes(), “iso8859-1”));
  显示页面
  
• 当是 response.setHeader(“Content-Disposition”,“attachment;filename=” + new String(fileName.getBytes(), “iso8859-1”));