关于birt报表输出时的JDBC连接和Script Data Source连接的设置
一个完整的birt的报表设计过程包括两部分：一是设计报表；二是运行和生成报表；
一、报表设计生成
报表设计生成就是生产一个报表的模板，及.rptdesign格式的文件（实际是一个xml文件的生成），这个过程包括了以下几个步骤：
1）生成数据源（datasource）；2）生成数据集（dataset）；3）生成报表设计
这个过程有很多的例子，比如birt官方的例子如下：
import java.io.IOException;import java.util.ArrayList;
import org.eclipse.birt.core.framework.Platform;
importorg.eclipse.birt.report.model.api.CellHandle;
importorg.eclipse.birt.report.model.api.DataItemHandle;
importorg.eclipse.birt.report.model.api.DesignConfig;
importorg.eclipse.birt.report.model.api.ElementFactory;
importorg.eclipse.birt.report.model.api.IDesignEngine;
importorg.eclipse.birt.report.model.api.IDesignEngineFactory;
importorg.eclipse.birt.report.model.api.LabelHandle;
importorg.eclipse.birt.report.model.api.OdaDataSetHandle;
importorg.eclipse.birt.report.model.api.OdaDataSourceHandle;
importorg.eclipse.birt.report.model.api.PropertyHandle;
importorg.eclipse.birt.report.model.api.ReportDesignHandle;
importorg.eclipse.birt.report.model.api.RowHandle;
importorg.eclipse.birt.report.model.api.SessionHandle;
importorg.eclipse.birt.report.model.api.StructureFactory;
importorg.eclipse.birt.report.model.api.TableHandle;
importorg.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.elements.structures.ComputedColumn;import com.ibm.icu.util.ULocale;
/**
*DynamicTableBIRTDesignEngineAPI(DEAPI)demo.
*/public class DECreateDynamicTable
{
ReportDesignHandledesignHandle=null;
ElementFactorydesignFactory=null;
StructureFactorystructFactory=null;
publicstaticvoidmain(String[]args)
{
try
{
DECreateDynamicTablede=newDECreateDynamicTable();
ArrayListal=newArrayList();
al.add("OFFICECODE");
al.add("CITY");
al.add("COUNTRY");
de.buildReport(al,"FromOffices");
}
catch(IOExceptione)
{
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
catch(SemanticExceptione)
{
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}void buildDataSource( ) throws SemanticException {
OdaDataSourceHandle dsHandle = designFactory.newOdaDataSource(
"DataSource","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(ArrayList cols, String fromClause ) throws SemanticException {
OdaDataSetHandle dsHandle = designFactory.newOdaDataSet( "ds",
"org.eclipse.birt.report.data.oda.jdbc.JdbcSelectDataSet");
dsHandle.setDataSource("DataSource");
Stringqry="Select";
for(inti=0;i<cols.size();i++){
qry+=""+cols.get(i);
if(i!=(cols.size()-1)){
qry+=",";
}
}
qry+=""+fromClause;
dsHandle.setQueryText( qry );designHandle.getDataSets( ).add( dsHandle );
}
voidbuildReport(ArrayListcols,StringfromClause)throwsIOException,SemanticException
{//ConfiguretheEngineandstartthePlatform
DesignConfig config = new DesignConfig( );config.setProperty("BIRT_HOME", "D:/work/libs/birt-runtime-2_2_2/ReportEngine");
IDesignEngineengine=null;
try{Platform.startup(config);
IDesignEngineFactoryfactory=(IDesignEngineFactory)Platform
.createFactoryObject(IDesignEngineFactory.EXTENSION_DESIGN_ENGINE_FACTORY);
engine = factory.createDesignEngine( config );}catch( Exception ex){
ex.printStackTrace();
}SessionHandle session = engine.newSessionHandle( ULocale.ENGLISH ) ;
try{
//openadesignoratemplate
designHandle = session.openDesign("new_report.rptdesign");designFactory = designHandle.getElementFactory( );
buildDataSource();
buildDataSet(cols,fromClause);
TableHandletable=designFactory.newTableItem("table",cols.size());
table.setWidth("100%");
table.setDataSet(designHandle.findDataSet("ds"));
PropertyHandlecomputedSet=table.getColumnBindings();
ComputedColumn cs1 = null;for( int i=0; i < cols.size(); i++){
cs1=StructureFactory.createComputedColumn();
cs1.setName((String)cols.get(i));
cs1.setExpression("dataSetRow[\""+(String)cols.get(i)+"\"]");
computedSet.addItem(cs1);
}
//tableheader
RowHandle tableheader = (RowHandle) table.getHeader( ).get( 0 );
for(inti=0;i<cols.size();i++){
LabelHandlelabel1=designFactory.newLabel((String)cols.get(i));
label1.setText((String)cols.get(i));
CellHandlecell=(CellHandle)tableheader.getCells().get(i);
cell.getContent().add(label1);
}
//tabledetail
RowHandletabledetail=(RowHandle)table.getDetail().get(0);
for(inti=0;i<cols.size();i++){
CellHandlecell=(CellHandle)tabledetail.getCells().get(i);
DataItemHandledata=designFactory.newDataItem("data_"+(String)cols.get(i));
data.setResultSetColumn((String)cols.get(i));
cell.getContent().add(data);
}
designHandle.getBody().add(table);
// Save the design and close it.designHandle.saveAs( "sample.rptdesign" ); //$NON-NLS-1$
designHandle.close();
System.out.println("Finished");
}catch(Exceptione){
e.printStackTrace();
}}
就可以生成一个名字叫“sample.rptdesign”的报表设计。
二是运行和生成报表
是利用birt的engine运行上面设计好的报表模板，生成所需要的报表输出。这个过程主要分成：1）生成报表引擎（ReportEngine）；2）设置输出方式（pdf、word、ppt等)；3）运行报表，生成输出文件。
import java.io.FileNotFoundException;
importjava.io.FileOutputStream;
importjava.io.OutputStream;
importjava.util.logging.Level;
importorg.eclipse.birt.core.exception.BirtException;
importorg.eclipse.birt.core.framework.Platform;
importorg.eclipse.birt.report.engine.api.EngineConfig;
importorg.eclipse.birt.report.engine.api.EngineException;
importorg.eclipse.birt.report.engine.api.IReportEngine;
importorg.eclipse.birt.report.engine.api.IReportEngineFactory;
importorg.eclipse.birt.report.engine.api.IReportRunnable;
importorg.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.engine.api.PDFRenderOption;public class MyReportCreator {
/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
EngineConfig config = new EngineConfig();config.setBIRTHome("D:/work/libs/birt-runtime-2_2_2/ReportEngine");
//Explicitlysetupthestand-aloneapplication
//Starttheplatformforanon-RCPapplication.
try{
Platform.startup(config);
}catch(BirtExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
IReportEngineFactoryfactory=(IReportEngineFactory)Platform
.createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
//SetupwritingimagesorchartsembeddedinHTMLoutput.
//HTMLRenderOptionho=newHTMLRenderOption();
//ho.setImageHandler(newHTMLCompleteImageHandler());
//config.setEmitterConfiguration(HTMLRenderOption.OUTPUT_FORMAT_HTML,ho);
PDFRenderOptionoption=newPDFRenderOption();
option.setOutputFormat("pdf");
try{
OutputStreamoutput=newFileOutputStream("./a.pdf");
option.setOutputStream(output);
}catch(FileNotFoundExceptione1){
//TODOAuto-generatedcatchblock
e1.printStackTrace();
}
//config.setEmitterConfiguration(PDFRenderOption.OUTPUT_FORMAT_PDF,option);
config.setLogConfig("d:/work",Level.WARNING);
//Createtheengine.
IReportEngineengine=factory.createReportEngine(config);
Stringdesignname="./SimpleReport.rptdesign";
IReportRunnablerunnable=null;
try{
runnable = engine.openReportDesign(designName);} catch (EngineException e) {
System.err.println("Design"+designName+"notfound!");
engine.destroy();
System.exit(-1);
}
//Getthevalueofasimpleproperty.
IRunAndRenderTasktask=engine.createRunAndRenderTask(runnable);
task.setParameterValue("Param1",newString("theinputstring."));
task.setParameterValue("Param2", 6);task.setRenderOption(option);
try{
task.run();
}catch(EngineExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
task.close();
}
}
这里需要特别关注的是，在实际工程中应用JDBC或者scriptedDataSource时，输出报表时，会报一个找不到driver或自定义的类的错误，此时的解决方法是：对于JDBC连接，要把相应的driver的jar包放在{$birt_runtime_home}\ReportEngine\plugins\org.eclipse.birt.report.data.oda.jdbc_2.2.2.r22x_v20071206
例如：D:\work\libs\birt-runtime-2_2_2\ReportEngine\plugins\org.eclipse.birt.report.data.oda.jdbc_2.2.2.r22x_v20071206
对于scriptedDataSource要设置EngineConfig的一个环境变量：
this.reportConfig.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, YourClass.class.getClassLoader());例如：
this.reportConfig.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, com.tkxing.htmlparser.buss.report.model.SingleStockDataReportModel.class.getClassLoader());