java - 如何在servlet中运行jasper报告

Question

我有一个简单的 jasper 报告，其中显示了数据库中的一些数据。 jasper 报表在 ireport 设计器上运行良好。问题是当我尝试从 servlet 运行报告时。我试图在从 servlet 运行时将报告导出为 pdf。 我包含了像

这样的依赖项

- jasperreports-4.6.0.jar
- itextpdf-5.1.1.jar
- commons-logging-1.1.1.jar
- commons-collections-3.2.1.jar
- commons-beanutils-1.8.3.jar
- commons-digester3-3.2.jar
- cglib-2.2.jar

我已将 report1.jasper 文件放置在/web/report1.jasper 中 这是我的 servlet 文件:

protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    Connection connection;
    ServletOutputStream servletOutputStream =response.getOutputStream();

    InputStream reportStream =getServletConfig().getServletContext().getResourceAsStream("/report1.jasper");

    HashMap parameterMap = new HashMap();
    String stdID="510BCT2010";
    String semester="1";
    parameterMap.put("stdID", stdID);
    parameterMap.put("semester", semester);
    try
    {
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        connection = DriverManager.getConnection ("jdbc:odbc:ACEM","","");
        JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, parameterMap, connection);

        connection.close();
        response.setContentType("application/pdf");
        servletOutputStream.flush();
        servletOutputStream.close();
    }
    catch (Exception e)
    {
        // display stack trace in the browser
        StringWriter stringWriter = new StringWriter();
        PrintWriter printWriter = new PrintWriter(stringWriter);
        e.printStackTrace(printWriter);
        response.setContentType("text/plain");
        response.getOutputStream().print(stringWriter.toString());
    }
}

当我第一次运行 servlet 时，出现以下错误:

java.lang.NoClassDefFoundError: org/apache/commons/digester/Rule
net.sf.jasperreports.components.ComponentsExtensionsRegistryFactory.<clinit>(ComponentsExtensionsRegistryFactory.java:100)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:247)
net.sf.jasperreports.engine.util.JRClassLoader.loadClassForRealName(JRClassLoader.java:157)
net.sf.jasperreports.engine.util.JRClassLoader.loadClassForName(JRClassLoader.java:115)
net.sf.jasperreports.engine.util.ClassUtils.instantiateClass(ClassUtils.java:53)
net.sf.jasperreports.extensions.DefaultExtensionsRegistry.instantiateRegistry(DefaultExtensionsRegistry.java:237)
net.sf.jasperreports.extensions.DefaultExtensionsRegistry.loadRegistries(DefaultExtensionsRegistry.java:214)
net.sf.jasperreports.extensions.DefaultExtensionsRegistry.loadRegistries(DefaultExtensionsRegistry.java:162)
net.sf.jasperreports.extensions.DefaultExtensionsRegistry.getRegistries(DefaultExtensionsRegistry.java:133)
net.sf.jasperreports.extensions.DefaultExtensionsRegistry.getExtensions(DefaultExtensionsRegistry.java:105)
net.sf.jasperreports.engine.util.JRStyledTextParser.<clinit>(JRStyledTextParser.java:83)
net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:121)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:88)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:103)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:61)
net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:153)
net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:55)
net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:446)
net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:407)
net.sf.jasperreports.engine.JasperRunManager.runToPdfStream(JasperRunManager.java:201)
net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:720)
com.reports.reportGenerator.doGet(reportGenerator.java:54)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

当我运行 servlet 时，出现以下错误

java.lang.NoClassDefFoundError: Could not initialize class net.sf.jasperreports.engine.util.JRStyledTextParser
net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:121)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:88)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:103)
net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:61)
net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:153)
net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:55)
net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:446)
net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:407)
net.sf.jasperreports.engine.JasperRunManager.runToPdfStream(JasperRunManager.java:201)
net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:720)
com.reports.reportGenerator.doGet(reportGenerator.java:54)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

它显示java.lang.NoClassDefFoundError。我是否错过了一些依赖项？我的报告没有图表，仅从数据库获取数据

Answer 1

根据堆栈跟踪，您的依赖项中似乎缺少 apache commons摘要器。