在Servlet(GWT)中生成的JasperReports不会出现

时间:2014-10-02 03:40:03

标签: java servlets gwt jasper-reports

我正在GWT中开发一个应用程序,我正在使用api生成 JasperReports 报告,最初尝试通过RPC进行生成,它使用pdf的路径返回给客户端一个字符串已创建,但这不起作用,现在我正在尝试通过普通的servlet生成报告,但生成报告,屏幕上没有任何内容,并且浏览器控制台中没有发现错误。

详细信息:

  • 开发模式完美无缺。
  • on localhost:8080完美无缺。

错误是在外部 Tomcat

中发布应用程序时的错误

这是我的代码

的Servlet

public class RelatorioPacienteServiceImpl extends HttpServlet {

private static final long serialVersionUID = 1L;
private ServletContext sc;

public void init(ServletConfig config) throws ServletException {
    super.init(config);
    sc = config.getServletContext();
}

@SuppressWarnings({ "unused", "unchecked", "rawtypes" })
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    String id = req.getParameter("id");
    Map m = req.getParameterMap();

    Paciente paciente = new Paciente();
    File reportFile = null;
    String dir = sc.getRealPath(sc.getContextPath().replaceAll("\\\\", "/"));

    Map parameters = new LinkedHashMap();

    String path = dir + "/../reports/";// tomcat
    path = path.replaceAll("\\\\", "/");

    try {
        paciente = PacienteDAO.getPacientePorId(Integer.parseInt(id));

        List<Paciente> list = new ArrayList<>();
        list.add(paciente);

          HashMap parametros = new HashMap<String, Boolean>();  
        parametros.put("cpf", NumberMask.formatCpf(paciente.getCpf()));
        parametros.put("telefone1",NumberMask.formatPhone(paciente.getTelefone1()));
        parametros.put("telefone2",NumberMask.formatPhone(paciente.getTelefone2()));
        parametros.put("telefoneResponsavel",NumberMask.formatPhone(paciente.getTelefoneResponsavel()));
        parametros.put("dataNascimento",StringUtil.formatDate(paciente.getDataNascimento()));
        switch (paciente.getEtnia()) {
        case EtniaProps.BRANCA:
            parametros.put("etnia","Branco");
            break;
        case EtniaProps.INDIGENA:
            parametros.put("etnia","Indigena");
            break;
        case EtniaProps.PARDA:
            parametros.put("etnia","Parda");
            break;
        case EtniaProps.PRETA:
            parametros.put("etnia","Preta");
            break;

        default:
            break;
        }

        reportFile = new File(path + "report_paciente.jasper");

        byte[] bytes = null;

        JRDataSource jrds = new JRBeanCollectionDataSource(list);

        try {
            bytes = JasperRunManager.runReportToPdf(reportFile.getPath(), parametros, jrds);
        } catch (JRException ex) {
            ex.printStackTrace();
            System.out.println("Erro ao gerar o relatório " + ex.getMessage());
        }

        if (!list.isEmpty()) {
            if (bytes != null && bytes.length > 0) {
                resp.setContentType("application/pdf");
                resp.setContentLength(bytes.length);
                ServletOutputStream outputStream = resp.getOutputStream();
                outputStream.write(bytes, 0, bytes.length);
                outputStream.flush();
                outputStream.close();

            }
        } else {
            resp.setContentType("text/html");
            ServletOutputStream outputStream = resp.getOutputStream();
            String mensagem = "<html>" + "<head>" + "<meta http-equiv=\"content-type\" charset=\"UTF-8\" content=\"text/html\">"
                    + "<title>Incor lages</title>" + "</head>" + "<body>"
                    + "<br><br><br><br><h1>Documento sem paginas" + "</body>" + "</html>";
            outputStream.write(mensagem.getBytes(), 0, mensagem.getBytes().length);
            resp.setContentLength(mensagem.getBytes().length);
            outputStream.flush();
            outputStream.close();
        }

    } catch (Exception e) {
        e.printStackTrace();
        System.out.println("Erro ao execura a query " + e.getMessage());
    }
}

调用servlet:

String url = GWT.getModuleBaseURL() + "relatorioPacienteService?id=" + paciente.getId();
Window.open(url, "_blank", "");

任何帮助将不胜感激

2 个答案:

答案 0 :(得分:0)

可以打印reportFile.getPath()。我怀疑.jasper文件的路径不正确。

答案 1 :(得分:0)

首先,它会更好如果你可以发布你的.jrxml文件。

根据可用的信息(生成报告但空白),我认为以下是关注的领域:

 paciente = PacienteDAO.getPacientePorId(Integer.parseInt(id));

 List<Paciente> list = new ArrayList<>();
 list.add(paciente);

确保PacienteDAO.getPacientePorId(Integer.parseInt(id));实际上正在返回一个bean。因为如果它没有返回任何内容或返回null,您使用的数据源即JRBeanCollectionDataSource将没有数据,因此不会显示任何内容。