BIRT: Dynamic Report Servlet

最新推荐文章于 2020-12-19 21:00:44 发布

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本文将展示如何利用BIRT（Business Intelligence Reporting Tools）创建动态报告，并通过表单和参数来实现交互式报告。重点介绍了从数据库获取数据、构建数据集、设置输出格式以及在Servlet中整合整个流程。

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[url]http://wiki.eclipse.org/Java_-_Dynamic_Report_Servlet_(BIRT)[/url]

<html>
	<head>
	</head>
	<body>
	The Query that is used for this example is Select * From OFFICES
		<form id="form1" method="get" action="http://localhost:8080/DynamicReport/run">
			<select name="dyna1" multiple size="8" >
				<option value="COUNTRY">COUNTRY</option>
				<option value="CITY">CITY</option>
				<option value="STATE">STATE</option>
				<option value="OFFICECODE">OFFICECODE</option>	
				<option value="ADDRESSLINE1">ADDRESSLINE1</option>	
				<option value="ADDRESSLINE2">ADDRESSLINE2</option>
				<option value="POSTALCODE">POSTALCODE</option>	
				<option value="TERRITORY">TERRITORY</option>			
			</select>

			<INPUT TYPE="SUBMIT" VALUE="Run Dynamic Report">
			<INPUT TYPE="HIDDEN" NAME="ReportName" Value="DynamicTableExample.rpttemplate">
		</form>
	</body>
</html>

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.birt.report.engine.api.EngineConstants;
import org.eclipse.birt.report.engine.api.HTMLRenderOption;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.model.api.CellHandle;
import org.eclipse.birt.report.model.api.DataItemHandle;
import org.eclipse.birt.report.model.api.ElementFactory;
import org.eclipse.birt.report.model.api.LabelHandle;
import org.eclipse.birt.report.model.api.OdaDataSetHandle;
import org.eclipse.birt.report.model.api.OdaDataSourceHandle;
import org.eclipse.birt.report.model.api.PropertyHandle;
import org.eclipse.birt.report.model.api.ReportDesignHandle;
import org.eclipse.birt.report.model.api.RowHandle;
import org.eclipse.birt.report.model.api.StructureFactory;
import org.eclipse.birt.report.model.api.TableHandle;
import org.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.elements.structures.ComputedColumn; 
import org.eclipse.birt.report.engine.api.HTMLServerImageHandler;


public class DynamicReport 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 DynamicReport() {
		super();
	}

	/**
	 * Destruction of the servlet. 

	 */
	public void destroy() {
		super.destroy(); 
		BirtEngine.destroyBirtEngine();
	}


	/**
	 * The doGet method of the servlet. 

	 *
	 */
 	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.setHeader ("Content-Disposition","inline; filename=test.pdf");		
		String reportName = req.getParameter("ReportName");
		String[] cols = (String[])req.getParameterMap().get("dyna1");
		ServletContext sc = req.getSession().getServletContext();
		this.birtReportEngine = BirtEngine.getBirtEngine(sc);

		IReportRunnable design;
		try
		{
			//Open report design
			design = birtReportEngine.openReportDesign( sc.getRealPath("/Reports")+"/"+reportName );
 			ReportDesignHandle report = (ReportDesignHandle) design.getDesignHandle( ); 
			buildReport( cols,  report );

			//create task to run and render report
			IRunAndRenderTask task = birtReportEngine.createRunAndRenderTask( design );		
			task.setAppContext( contextMap );

			//set output options
                       HTMLRenderOption options = new HTMLRenderOption();
                       options.setImageHandler( new HTMLServerImageHandler() );
                       options.setImageDirectory( sc.getRealPath("/images");
                       options.setBaseImageURL( req.getContextPath() + "/images" );
			options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_HTML);
 			//options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_PDF);
			options.setOutputStream(resp.getOutputStream());
			task.setRenderOption(options);

			//run report
			task.run();
			task.close();
		}catch (Exception e){

 			e.printStackTrace();
 			throw new ServletException( e );
		}
	}

	public void buildReport(String[]  cols, ReportDesignHandle designHandle){


		try{
		ElementFactory designFactory = designHandle.getElementFactory( );

		buildDataSource(designFactory, designHandle);


		//ArrayList cols = new ArrayList();
		//cols.add("OFFICECODE");
		//cols.add("CITY");
		//cols.add("COUNTRY");

		buildDataSet(cols, "From Offices", designFactory, designHandle);

		TableHandle table = designFactory.newTableItem( "table", cols.length );
		table.setWidth( "100%" );
		table.setDataSet( designHandle.findDataSet( "ds" ) );


		PropertyHandle computedSet = table.getColumnBindings( ); 
		ComputedColumn  cs1 = null;

		for( int i=0; i < cols.length; i++){
 			cs1 = StructureFactory.createComputedColumn();
			cs1.setName((String)cols[i]);
			cs1.setExpression("dataSetRow[\"" + (String)cols[i] + "\"]");
			computedSet.addItem(cs1);
		}


		// table header
		RowHandle tableheader = (RowHandle) table.getHeader( ).get( 0 );


		for( int i=0; i < cols.length; i++){
			LabelHandle label1 = designFactory.newLabel( (String)cols[i] );	
			label1.setText((String)cols[i]);
			CellHandle cell = (CellHandle) tableheader.getCells( ).get( i );
			cell.getContent( ).add( label1 );
		}							

		// table detail
		RowHandle tabledetail = (RowHandle) table.getDetail( ).get( 0 );
		for( int i=0; i < cols.length; i++){
			CellHandle cell = (CellHandle) tabledetail.getCells( ).get( i );
			DataItemHandle data = designFactory.newDataItem( "data_"+(String)cols[i] );
			data.setResultSetColumn( (String)cols[i]);
			cell.getContent( ).add( data );
		}



		designHandle.getBody( ).add( table );
		}catch(Exception e){
			e.printStackTrace();
		}

	}

	void buildDataSource( ElementFactory designFactory, ReportDesignHandle designHandle ) throws SemanticException
	{

		OdaDataSourceHandle dsHandle = designFactory.newOdaDataSource(
				"Data Source", "org.eclipse.birt.report.data.oda.jdbc" );
		dsHandle.setProperty( "odaDriverClass",
 		"org.eclipse.birt.report.data.oda.sampledb.Driver" );
		dsHandle.setProperty( "odaURL", "jdbc:classicmodels:sampledb" );
		dsHandle.setProperty( "odaUser", "ClassicModels" );
		dsHandle.setProperty( "odaPassword", "" );

		designHandle.getDataSources( ).add( dsHandle );

	}

	void buildDataSet(String[] cols, String fromClause, ElementFactory designFactory, ReportDesignHandle designHandle ) throws SemanticException
	{

		OdaDataSetHandle dsHandle = designFactory.newOdaDataSet( "ds",
		"org.eclipse.birt.report.data.oda.jdbc.JdbcSelectDataSet" );
		dsHandle.setDataSource( "Data Source" );
		String qry = "Select ";
		for( int i=0; i < cols.length; i++){
			qry += " " + cols[i];
			if( i != (cols.length -1) ){
				qry += ",";
			}

		}
		qry += " " + fromClause;

		dsHandle.setQueryText( qry );

 		designHandle.getDataSets( ).add( dsHandle );


	}	 
 	/**
 	 * The doPost method of the servlet. 

 	 *
 	 */
 	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. 

	 *
	 * @throws ServletException if an error occure
	 */
 	public void init() throws ServletException {
		BirtEngine.initBirtConfig();

	}

}

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>

    <display-name>DynamicReport</display-name>


	<servlet>
		<servlet-name>DynamicReport</servlet-name>
		<servlet-class>DynamicReport</servlet-class>
	</servlet>

	<servlet-mapping>
		<servlet-name>DynamicReport</servlet-name>
		<url-pattern>/run</url-pattern>
	</servlet-mapping>


</web-app>