java - 贾斯珀报告 : calling report from jar

Question

我正在使用 JasperReports 4.7.1 插件 for NetBeans 7.2 从 mysql 数据库生成报告当我从 ide 运行应用程序时，没有发现任何问题，接受此警告:

log4j:WARN No appenders could be found for logger (net.sf.jasperreports.engine.xml.JRXmlDigesterFactory).
log4j:WARN Please initialize the log4j system properly.

但是报告生成并正确查看。

问题是，当我清理并构建应用程序，然后从 jar 文件中调用它时，报告不会生成，也不会给我任何异常，只是没有查看报告，其他一切都正常？

这是我在 JasperViewer 中查看报告的函数:

public void printInvoice(int invid) throws IOException {
    try {
        String sql = "SELECT\n" +
                "     ordersdetails.`ITEMNAME` AS ordersdetails_ITEMNAME,\n" +
                "     ordersdetails.`AMOUNT` AS ordersdetails_AMOUNT,\n" +
                "     ordersdetails.`PRICE` AS ordersdetails_PRICE,\n" +
                "     invoices.`INVOICEID` AS invoices_INVOICEID,\n" +
                "     invoices.`CUSTOMER` AS invoices_CUSTOMER,\n" +
                "     invoices.`THEDATE` AS invoices_THEDATE,\n" +
                "     invoices.`COST` AS invoices_COST\n" +
                "FROM\n" +
                "     `invoices` invoices RIGHT OUTER JOIN `ordersdetails` ordersdetails ON invoices.`INVOICEID` = ordersdetails.`INVOICE` where invoices.invoiceid=" + invid;

        InputStream in = this.getClass().getResourceAsStream("/reports/invoice.jrxml");

        JasperDesign jd = JRXmlLoader.load(in);

        JRDesignQuery q = new JRDesignQuery();
        q.setText(sql);
        jd.setQuery(q);

        JasperReport jasp_rep = JasperCompileManager.compileReport(jd);

        JasperPrint jasp_print = JasperFillManager.fillReport(jasp_rep, null, mc.getConnection());
        JasperViewer.viewReport(jasp_print, false);
    } catch (JRException e) {
        JOptionPane.showMessageDialog(null, e.getMessage());
        System.out.println(e);
    }
}

Answer 1

可能从错误的位置加载报告，尝试相对路径:

InputStream in = this.getClass().getResourceAsStream("reports/invoice.jrxml");

这意味着报表文件夹中存在invoice.jrxml，并且该文件夹与调用getResourceAsStream 的类(this.getClass()) 处于同一级别。

此外，您可以使用

绕过警告

org.apache.log4j.BasicConfigurator.configure();

在程序开始时。