我有一些 XML 形式的数据，其中包含很少的记录，并且还创建了一个 RPT 文件。
那么现在，我如何调用 birt 通过传递 XML 和 RPT 作为输入参数来生成报告。
我对 BIRT 完全陌生。任何代码示例将不胜感激。
【问题讨论】：
【讨论】：
试试这个：BirtEngine.java：
public class BirtEngine {
private static IReportEngine birtEngine = null;
private static Properties configProps = new Properties();
private final static String configFile = "BirtConfig.properties";
public static synchronized void initBirtConfig() {
loadEngineProps();
}
public static synchronized IReportEngine getBirtEngine(ServletContext sc) {
if (birtEngine == null)
{
EngineConfig config = new EngineConfig();
if( configProps != null){
String logLevel = configProps.getProperty("logLevel");
Level level = Level.OFF;
if ("SEVERE".equalsIgnoreCase(logLevel))
{
level = Level.SEVERE;
} else if ("WARNING".equalsIgnoreCase(logLevel))
{
level = Level.WARNING;
} else if ("INFO".equalsIgnoreCase(logLevel))
{
level = Level.INFO;
} else if ("CONFIG".equalsIgnoreCase(logLevel))
{
level = Level.CONFIG;
} else if ("FINE".equalsIgnoreCase(logLevel))
{
level = Level.FINE;
} else if ("FINER".equalsIgnoreCase(logLevel))
{
level = Level.FINER;
} else if ("FINEST".equalsIgnoreCase(logLevel))
{
level = Level.FINEST;
} else if ("OFF".equalsIgnoreCase(logLevel))
{
level = Level.OFF;
}
config.setLogConfig(configProps.getProperty("logDirectory"), level);
}
config.setEngineHome("");
IPlatformContext context = new PlatformServletContext( sc );
//IPlatformContext context = new PlatformFileContext();
config.setPlatformContext( context );
//Create the report engine
//birtEngine = new ReportEngine( config );
//ReportEngine engine = new ReportEngine( null );
try
{
Platform.startup( config );
}
catch ( BirtException e )
{
e.printStackTrace( );
}
IReportEngineFactory factory = (IReportEngineFactory) Platform
.createFactoryObject( IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY );
birtEngine = factory.createReportEngine( config );
}
return birtEngine;
}
public static synchronized void destroyBirtEngine() {
if (birtEngine == null) {
return;
}
birtEngine.destroy();
Platform.shutdown();
birtEngine = null;
}
public Object clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}
private static void loadEngineProps() {
try {
//Config File must be in classpath
ClassLoader cl = Thread.currentThread ().getContextClassLoader();
InputStream in = null;
in = cl.getResourceAsStream (configFile);
configProps.load(in);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
webreport.java：
public class WebReport extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructor of the object.
*/
private IReportEngine birtReportEngine = null;
protected static Logger logger = Logger.getLogger( "org.eclipse.birt" );
public WebReport() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy();
BirtEngine.destroyBirtEngine();
}
/**
* The doGet method of the servlet. <br>
*
*/
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//get report name and launch the engine
//resp.setContentType("text/html");
//resp.setContentType( "application/pdf" );
resp.setContentType( "application/msword" );
//resp.setHeader ("Content-Disposition","inline; filename=test.pdf");
resp.setHeader("Content-disposition","attachment; filename=\"" +"test.doc" +"\"");
String reportName = req.getParameter("ReportName");
ServletContext sc = req.getSession().getServletContext();
this.birtReportEngine = BirtEngine.getBirtEngine(sc);
IReportRunnable design;
try
{
//Open report design
design = birtReportEngine.openReportDesign( sc.getRealPath("/Reports")+"/"+reportName );
//create task to run and render report
IRunAndRenderTask task = birtReportEngine.createRunAndRenderTask( design );
task.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, WebReport.class.getClassLoader());
task.getAppContext().put("BIRT_VIEWER_HTTPSERVLET_REQUEST", req );
//set output options
//HTMLRenderOption options = new HTMLRenderOption();
//options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_HTML);
//options.setOutputStream(resp.getOutputStream());
//options.setImageHandler(new HTMLServerImageHandler());
//options.setBaseImageURL(req.getContextPath()+"/images");
//options.setImageDirectory(sc.getRealPath("/images"));
/*PDFRenderOption options = new PDFRenderOption();
options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_PDF);
options.setOutputStream(resp.getOutputStream());
*/
RenderOption options = new RenderOption();
options.setOutputFormat("doc");
options.setOutputStream(resp.getOutputStream());
//options.setEnableAgentStyleEngine(true);
//options.setEnableInlineStyle(true);
task.setRenderOption(options);
//run report
task.run();
task.close();
}catch (Exception e){
e.printStackTrace();
throw new ServletException( e );
}
}
/**
* The doPost method of the servlet. <br>
*
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.println(" Post Not Supported");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init(ServletConfig sc) throws ServletException {
BirtEngine.initBirtConfig();
this.birtReportEngine = BirtEngine.getBirtEngine(sc.getServletContext());
}
}
birtconfig 属性：
ogDirectory=c:/temp
logLevel=FINEST
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