Java预览JasperReport报表

本文章将向读者展示怎样通过Java代码去为我们设计好的jasper报表填充数据（使用json作为数据源）和预览报表。关于报表的制作请查看《第一个JasperReport项目HelloWorld》文章。下面是实现java代码：

package com.huangx;

import java.io.ByteArrayInputStream;
import java.util.HashMap;

import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.HashPrintServiceAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.PrintServiceAttributeSet;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.PrinterName;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;

import com.alibaba.fastjson.JSONObject;

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.JsonDataSource;
import net.sf.jasperreports.engine.export.JRPrintServiceExporter;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.export.SimpleExporterInput;
import net.sf.jasperreports.export.SimplePrintServiceExporterConfiguration;
import net.sf.jasperreports.view.JasperViewer;

/**
 * 打印和预览报表
 * @author Administrator
 * @date 2017年8月8日 16:10:20
 */
public class JasperHello {
    private static final Logger LOG = LoggerFactory.getLogger(JasperHello.class);

    public static void main(String[] args) {
        new JasperHello();
    }

    public JasperHello() {
        try {
            JasperReport jasperReport = (JasperReport)JRLoader.loadObject(
                    new ClassPathResource("hello.jasper").getInputStream());

            // 填充报表数据
            JSONObject data = new JSONObject();
            data.put("title", "Hello World");
            data.put("content", "您好！这是一个测试报表，如果你能看见这条信息，则说明测试Jaspersoft成功了。恭喜！！");
            data.put("date", "2017年8月14日");

            JsonDataSource jsonDataSource = new JsonDataSource(
                    new ByteArrayInputStream(data.toJSONString().getBytes()));

            HashMap<String, Object> parameter = new HashMap<String, Object>();
            JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameter, jsonDataSource);

            // 打印报表
//            print(jasperPrint);

            // 预览报表
            preview(jasperPrint);
        } catch(Exception e) {
            LOG.error(e.getMessage(), e);
        }
    }

    /**
     * 预览报表
     * @param jasperPrint
     */
    protected void preview(JasperPrint jasperPrint) {
        JasperViewer.viewReport(jasperPrint, false);
    }

    /**
     * 打印报表
     * @param jasperPrint
     * @throws JRException
     */
    protected void print(JasperPrint jasperPrint) throws JRException {
        JRPrintServiceExporter exporter = new JRPrintServiceExporter();
        exporter.setExporterInput(new SimpleExporterInput(jasperPrint));

        SimplePrintServiceExporterConfiguration configuration = new SimplePrintServiceExporterConfiguration();
        // 设置打印机请求参数
        PrintRequestAttributeSet printRequestAttributeSet = new HashPrintRequestAttributeSet();
        printRequestAttributeSet.add(MediaSizeName.ISO_A4);
        configuration.setPrintRequestAttributeSet(printRequestAttributeSet);

        // 打印机服务参数
        PrintServiceAttributeSet printServiceAttributeSet = new HashPrintServiceAttributeSet();

        // 获取默认打印服务
        PrintService printService = PrintServiceLookup.lookupDefaultPrintService();
        if ( null == printService ) {
            throw new NullPointerException("没有找到打印服务，请设置本机默认的打印机服务");
        }
        LOG.debug("{}", printService);
        printServiceAttributeSet.add(new PrinterName(printService.getName(), null));
        configuration.setPrintServiceAttributeSet(printServiceAttributeSet);

        // 设置是否显示页面设置页面
        configuration.setDisplayPageDialog(false);

        // 设置是否显示打印机选择界面
        configuration.setDisplayPrintDialog(true);
        exporter.setConfiguration(configuration);

        // 执行打印
        exporter.exportReport();
    }
}

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执行效果图如下：