三种Java打印PDF文档的实例代码

接下来我将为您详细讲解“三种Java打印PDF文档的实例代码”的完整攻略。

1. 使用Java本身的打印功能

Java本身提供了一些打印功能，可以帮助我们打印PDF文档。下面是使用Java本身的打印功能的示例代码：

import java.awt.print.PrinterJob;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.printing.PDFPageable;

public class PrintPDFUsingJava {

    public static void main(String[] args) throws Exception {
        //加载pdf文件
        PDDocument document = PDDocument.load(new File("example.pdf"));

        //获取当前打印机
        PrintService defaultPrintService = PrintServiceLookup.lookupDefaultPrintService();

        //打印要输出的文档
        PrinterJob job = PrinterJob.getPrinterJob();
        job.setPageable(new PDFPageable(document));
        job.setPrintService(defaultPrintService);
        job.print();

        //释放文档资源
        document.close();
    }
}

2. 使用JasperReports打印PDF文档

JasperReports提供了一些工具类和API，可以帮助我们打印PDF文档。 下面是使用JasperReports打印PDF文档的示例代码：

import java.sql.Connection;
import java.sql.DriverManager;
import java.util.HashMap;
import java.util.Map;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.export.SimpleExporterInput;
import net.sf.jasperreports.export.SimplePrintServiceExporterConfiguration;
import net.sf.jasperreports.export.SimplePrintServiceReportConfiguration;
import net.sf.jasperreports.export.SimpleWriterExporterOutput;

public class PrintPDFUsingJasperReports {

    public static void main(String[] args) throws Exception {
        //向数据库加载数据
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection("jdbc:mysql:localhost:3306/myDatabase", "root", "123456");

        //加载jrxml文件
        JasperReport jasperReport = (JasperReport) JRLoader.loadObject(new File("example.jrxml"));

        //准备参数
        Map<String, Object> parameters = new HashMap<>();
        parameters.put("reportTitle", "Example Report");

        //准备数据源
        JRDataSource dataSource = new JREmptyDataSource();

        //生成报表
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);

        //设置打印机
        SimplePrintServiceReportConfiguration reportConfig = new SimplePrintServiceReportConfiguration();
        SimplePrintServiceExporterConfiguration exportConfig = new SimplePrintServiceExporterConfiguration();
        exportConfig.setPrintService(defaultPrintService);
        exporter.setConfiguration(exportConfig);

        //添加输出选项
        SimpleWriterExporterOutput output = new SimpleWriterExporterOutput();
        exporter.setExporterOutput(output);

        //打印报表
        SimpleExporterInput input = new SimpleExporterInput(jasperPrint);
        exporter.setExporterInput(input);
        exporter.exportReport();

        //释放资源
        conn.close();
    }
}

3. 使用iText打印PDF文档

iText是一个非常流行的PDF生成和编辑库，支持打印PDF文档。 下面是使用iText打印PDF文档的示例代码：

import com.itextpdf.text.Document;
import com.itextpdf.text.DocWriter;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;

public class PrintPDFUsingiText {

    public static void main(String[] args) throws Exception {
        //载入PDF文档
        PdfReader reader = new PdfReader("example.pdf");
        int n = reader.getNumberOfPages();

        //获取打印服务
        PrintService defaultPrintService = PrintServiceLookup.lookupDefaultPrintService();

        //打印PDF
        Document document = new Document();
        DocWriter writer = DocWriter.getInstance(document, defaultPrintService);
        document.open();
        PdfImportedPage page;

        for (int i = 1; i <= n; i++) {
            page = writer.getImportedPage(reader, i);
            document.add(page);
        }

        document.close();
        reader.close();
    }
}

以上就是三种Java打印PDF文档的实例代码的详细攻略。