Java 报表打印

在项目中需要涉及这一块,在此之前是从未接触过的.在此记录一些方法和问题.

// 得到测试用的绑定数据
PolicyDatasource datasource = new PolicyDatasource(new PolicyService().getAll());
response.setCharacterEncoding("utf-8");
// 把模板文件读取进内存
InputStream in = this.getServletContext().getResourceAsStream(reportPath);// reportPath:模板路径
try {
	// 1.在Chrome上直接显示PDF或是下载
	// response.addHeader("Content-Disposition", "attachment;filename=PO.pdf");
	// response.setContentType("application/pdf");
	// JasperRunManager.runReportToPdfStream(in, response.getOutputStream(), new HashMap(), datasource);
	// 2.
	// File reportFile = new File(this.getServletContext().getRealPath(reportPath));
	// byte[] bytes = null;
	// try {
	// bytes = JasperRunManager.runReportToPdf(reportFile.getPath(), new HashMap(), datasource);
	// response.setContentLength(bytes.length);
	// out.write(bytes, 0, bytes.length);
	// out.flush();
	// out.close();
	// } catch (JRException e) {
	// throw new RuntimeException(e);
	// }
	// 3.直接在HTML页面上显示出来
	response.setContentType("text/html");
	// 填充数据或者叫绑定数据,in代表模板文件,datasource代表填充的数据,已经给定了datasource,就直接给个空的HashMap就行了
	JasperPrint print = JasperFillManager.fillReport(in, new HashMap(), datasource);
	// 构建一个JRHtmlExporter,用于把填充好的模板打印在HTML页面上
	JRHtmlExporter exporter = new JRHtmlExporter();
	// 设置一些显示参数
	exporter.setParameter(JRHtmlExporterParameter.SIZE_UNIT, JRHtmlExporterParameter.SIZE_UNIT_POINT);
	exporter.setParameter(JRExporterParameter.JASPER_PRINT, print);
	// exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, false);
	exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, response.getWriter());
	exporter.setParameter(JRHtmlExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS, Boolean.TRUE);
	exporter.setParameter(JRExporterParameter.CHARACTER_ENCODING, "UTF-8");
	exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "../servlets/image?image=");
	request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, print);
	// 导出到页面
	exporter.exportReport();
} catch (Exception e) {
	throw new RuntimeException(e);
} finally {
	in.close();
}

如果模板中的线条重叠,会导致在HTML页面上没有显示.

字体未找到的问题,来自网络:

1、下载jasperreport（本人用的是3.7.4版本）工程，将demo/fonts/net/sf/jasperreports/fonts/dejavu下的demo字体清除

2、将windows系统下的字体文件SIMSUN.TTC文件（XP在%SYSTEM%/WINDOWS/Fonts下）copy到demo /fonts/net/sf/jasperreports/fonts/dejavu下，并将名称后缀改为ttf。这个要记着改，ttf是AIX下的字体 格式，否则不会识别。

3、修改demo/fonts/net/sf/jasperreports/fonts下的fonts.xml，将原来字体配置指定到上步骤copy到dejavu目录下的字体文件，如我的改名后叫songti.ttf，所以改后fonts.xml为以下内容（供参考）

<?xml version="1.0" encoding="UTF-8"?>
<fontFamilies>
    <fontFamily name="宋体">
        <normal>net/sf/jasperreports/fonts/dejavu/songti.ttf</normal>
        <bold>net/sf/jasperreports/fonts/dejavu/songti.ttf</bold>
        <italic>net/sf/jasperreports/fonts/dejavu/songti.ttf</italic>
        <boldItalic>net/sf/jasperreports/fonts/dejavu/songti.ttf</boldItalic>
        <pdfEncoding>Identity-H</pdfEncoding>
        <pdfEmbedded>true</pdfEmbedded>
        <exportFonts>
            <export key="net.sf.jasperreports.html">'宋体', Arial, Helvetica, sans-serif</export>
            <export key="net.sf.jasperreports.xhtml">'宋体', Arial, Helvetica, sans-serif</export>
        </exportFonts>     
    </fontFamily>
</fontFamilies>

4、将demo/fonts下的内容打成jar包，并放到程序的类路径下。
5、在Web根目录下增加配置文件jasperreports.properties，内容如下

net.sf.jasperreports.awt.ignore.missing.font=true
net.sf.jasperreports.extension.registry.factory.simple.font.families=net.sf.jasperreports.engine.fonts.SimpleFontExtensionsRegistryFactory
net.sf.jasperreports.extension.simple.font.families.dejavu=net/sf/jasperreports/fonts/fonts.xml