birt

和现有项目有两种结合方式。
其一:直接使用birt_runtime_2.1.2中的WebViewerExample。
将其发布到C:/jakarta-tomcat-5.0.28/webapps目录下，并将其更改名称为birtApp。
在birtApp /WEB-INF/platform/plugins/com.lowagie.itext目录下新建文件夹lib,并将itext-1.3.jar和iTextAsian.jar拷入其中。
将已完成的报表，比如test.rptdesign放到birtApp的根目录下，即可通过
http://localhost:8080/birt/frameset?__report=test.rptdesign(相对路径)
或者
http://localhost:8080/birt/frameset?__report=C:/jakarta-tomcat-5.0.28/webapps/birt/test.rptdesign(绝对路径)
来访问。
若报表设置以后参数，则只需在上述url后拼接参数及值即可。
Eg: http://localhost:8080/birt/frameset?__report=test.rptdesign&sample=my+parameter
其二：在我们的程序中使用birt提供的Report Engine Api来调用报表并展现报表。
新建web项目webrpt。
在webrpt的web模块下的WEB-INF目录中新建文件夹lib,并将birt-runtime-2_1_2/ReportEngine/lib下的所有文件拷入其中。
如上，同样在WEB-INF目录中新建文件夹platform,并将birt-runtime-2_1_2/ReportEngine下的plugins和configuration拷入其中。
将itext-1.3.jar和iTextAsian.jar拷入platform/plugins/com.lowagie.itext文件夹的lib目录中（此处如果没有该目录，新建之），亦或者将所述jar包拷入WEB-INF/lib目录下也可。
在webrpt的web模块的根目录下新建images和reports文件夹。其中reports文件夹中放
已开发完成的报表文件。
当然所使用的数据库驱动也要放在lib文件夹下。
使用report engine api开发调用及展示报表的相关程序。代码如下：
WebReport.java
package com.lisa;

import java.io.IOException;
import java.io.PrintWriter;
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.HTMLRenderContext;
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;


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


/**
* The doGet method of the servlet.
*
*/
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
System.out.println("doGet................");

//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");
System.out.println("reportName:::"+reportName);
ServletContext sc = req.getSession().getServletContext();
this.birtReportEngine = BirtEngine.getBirtEngine(sc);

//setup image directory
HTMLRenderContext renderContext = new HTMLRenderContext();
renderContext.setBaseImageURL(req.getContextPath()+"/images");
renderContext.setImageDirectory(sc.getRealPath("/images"));

logger.log( Level.FINE, "image directory " + sc.getRealPath("/images"));
System.out.println("stdout image directory " + sc.getRealPath("/images"));

HashMap contextMap = new HashMap();
contextMap.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT, renderContext );

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.setAppContext( contextMap );

HashMap paramMap=new HashMap();
paramMap.put("param","%");
paramMap.put("sample", "lisa ok");

task.setParameterValues(paramMap);



//set output options
HTMLRenderOption options = new HTMLRenderOption();
//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 );
}
}

/**
* 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 does nothing");
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 {
System.out.println("init...................");
BirtEngine.initBirtConfig();

}

}

BirtEngine.java
package com.lisa;

import java.io.InputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;

import org.eclipse.birt.report.engine.api.EngineConfig;
import org.eclipse.birt.report.engine.api.IReportEngine;
import javax.servlet.*;
import org.eclipse.birt.core.framework.PlatformServletContext;
import org.eclipse.birt.core.framework.IPlatformContext;
import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.report.engine.api.IReportEngineFactory;

public class BirtEngine {

private static IReportEngine birtEngine = null;

private static Properties configProps = new Properties();

private final static String configFile = "com/lisa/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 );
config.setPlatformContext( context );


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.shutdown();
Platform.shutdown();
birtEngine = null;
}

public Object clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}

private static void loadEngineProps() {
System.out.println("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();
}

}

}
BirtConfig.properties
logDirectory=c:/temp
logLevel=FINEST

通过web页面输入要访问的报表名称，并提交到处理请求的相关servlet.
Test.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<html>
<head>
</head>

<body>
<form name="myform" action="./webReport" method="get">
<table>
<tr>
<td>报表名称(带后缀名)</td>
<td><input name="ReportName" type="text"></td>
<td><button type="submit">查看</button></td>
</tr>
</table>
</form>
</body>
</html>
修改web.xml文件如下
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>WebReport</servlet-name>
<servlet-class>com.lisa.WebReport</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WebReport</servlet-name>
<url-pattern>/webReport</url-pattern>
</servlet-mapping>
</web-app>