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第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

分类: IT文章 • 2024-01-31 19:09:54
第十三章 BIRT报表引擎API及报表API (续)-自定义web BIRT展示器

13.2  自定义BIRT viewer（报表展示器）

前面我们提到了可以通过java定制报表查看器，通过servlet访问webreport，方便系统集成。下面我详细讲解如何实现这个过程：

首先实现自定义报表引擎ReportEngine

package birtbird;

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

import javax.servlet.ServletContext;

import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.core.framework.IPlatformContext;
import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.core.framework.PlatformServletContext;
import org.eclipse.birt.report.engine.api.EngineConfig;
import org.eclipse.birt.report.engine.api.EngineConstants;
import org.eclipse.birt.report.engine.api.IReportEngine;
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 = "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.getAppContext().put(
					EngineConstants.APPCONTEXT_CLASSLOADER_KEY,
					Thread.currentThread().getContextClassLoader());
			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.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();
		}

	}

}

再其次实现自定义birtviewer selvlet，下面的代码很重要，直接决定了报表展示器的外观

package birtbird;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.logging.Logger;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.birt.report.engine.api.HTMLRenderOption;
import org.eclipse.birt.report.engine.api.IGetParameterDefinitionTask;
import org.eclipse.birt.report.engine.api.IParameterDefnBase;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.engine.api.IScalarParameterDefn;
import org.eclipse.birt.report.engine.api.PDFRenderOption;
import org.eclipse.birt.report.engine.api.RenderOption;
public class ReportServlet 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 ReportServlet() {
  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 {
  resp.setCharacterEncoding("utf-8");
try {
 String reportName = req.getParameter("ReportName");
String baseUrl = req.getContextPath() + "/webReport?ReportName="
  + reportName;
String imgBaseUrl = req.getContextPath() + "/reports/images";
String outFormat = "html";
// 处理页面传过来的参数
HashMap<String, String> paramMap = new HashMap<String, String>();
Enumeration en = req.getParameterNames();
while (en.hasMoreElements()) {
 String pName = (String) en.nextElement();
 String pValue = req.getParameter(pName);
 if (pName.equals("O_FORMAT")) {
  outFormat = pValue;
 } else {
  paramMap.put(pName, pValue);
 }
}
ServletContext sc = req.getSession().getServletContext();
this.birtReportEngine = BirtEngine.getBirtEngine(sc);
IReportRunnable design = birtReportEngine.openReportDesign(sc
  .getRealPath("/reports") + "/" + reportName);
HashMap<String, Object> parameters = new HashMap<String, Object>();
// 以打开的报表设计文件为参数，创建一个获取参数的对象
IGetParameterDefinitionTask paramTask = birtReportEngine
  .createGetParameterDefinitionTask(design);
// 获取报表设计文件中的参数定义
Collection paramDefns = paramTask.getParameterDefns(false);
// 为获取的参数定义赋值
Iterator iter = paramDefns.iterator();
while (iter.hasNext()) {
 IParameterDefnBase pBase = (IParameterDefnBase) iter.next();
 if (pBase instanceof IScalarParameterDefn) {
  IScalarParameterDefn paramDefn = (IScalarParameterDefn) pBase;
  String pName = paramDefn.getName();// 报表参数名称
  // int pType = paramDefn.getDataType( );
  String pValue = paramMap.get(pName);// 页面传过来的值
  if (pValue == null) {
   pValue = "";
  } else {
   baseUrl += "&" + pName + "=" + pValue;
  }
  // Object pObject = stringToObject( pType, pValue );
  parameters.put(pName, pValue);
 }
}
if (outFormat.equals("html")) {// 页面展示
 resp.setContentType("text/html");
 HTMLRenderOption htmlOptions = new HTMLRenderOption();
 htmlOptions.setOutputFormat(RenderOption.OUTPUT_FORMAT_HTML);
 // 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"));
 // HashMap contextMap = new HashMap();
 // contextMap.put(EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
 // renderContext);
 // htmlOptions.setImageDirectory("output/image");
 // htmlOptions.setMasterPageContent(true);
 // htmlOptions.setPageFooterFloatFlag(true);
 ByteArrayOutputStream ostream = new ByteArrayOutputStream();
 htmlOptions.setOutputStream(ostream);
 htmlOptions.setHtmlPagination(true);// 加入分页条
 htmlOptions.setEmbeddable(true);// 去除html、head、body标记
 IRunAndRenderTask task = birtReportEngine
   .createRunAndRenderTask(design);
 if (parameters != null && !parameters.isEmpty()) {
  task.setParameterValues(parameters);
  task.validateParameters();
 }
 String maxRow = req.getParameter("MaxRowsPerQuery");
 if (maxRow != null && maxRow.length() > 0) {
  task.setMaxRowsPerQuery(Integer.parseInt(maxRow));// 设置每次查询最大行数
 }
 task.setRenderOption(htmlOptions);
 task.run();
 task.close();
 ServletOutputStream out = resp.getOutputStream();
 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
 out.println("<html>");
 out.println("  <head>");
 out.println("  <meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">");
 out.println(" <style type=text/css>");
 // out.println("  td{border:1px solid #9EBFE0;font-Size:12px;}");
 // out.println("  th{background-color:#C3D5ED;border:1px solid #9EBFE0;font-Size:12px;font-weight:bold;text-align:center;}");
 out.println("  img { vertical-align:middle;}");
 out.println(" </style>");
 out.println("  </head>");
 out.println("  <body>");
 // String ostr = ostream.toString("ISO-8859-1");
 String ostr = ostream.toString("utf-8");
 if (ostr.length() > 1048576) {// 大于1M则分好页再传到浏览器端，减少网络流量，减轻浏览器压力
  ArrayList<Integer> indexArray = new ArrayList<Integer>();
  for (int i = 0; ostr.indexOf("page separator", i) != -1;) {
   int index = ostr.indexOf("page separator", i);
   indexArray.add(index);
   i = index + 1;
  }
  int totalPage = indexArray.size() + 1;
  int curPage = 1;
  if (totalPage > 1) {
   String strCurPage = req.getParameter("PB_PAGE");
   if (strCurPage != null && strCurPage.length() > 0) {
    curPage = Integer.parseInt(strCurPage);
   }
   if (curPage <= 1) {
    curPage = 1;
    int index = indexArray.get(curPage - 1);
    int subIndex = ostr.lastIndexOf("<", index);
    ostr = ostr.substring(0, subIndex);
   } else if (curPage >= totalPage) {
    curPage = totalPage;
    int index = indexArray.get(curPage - 2);
    int subIndex = ostr.indexOf(">", index) + 1;
    ostr = ostr.substring(subIndex);
   } else {
    int beginIndex = indexArray.get(curPage - 2);
    int bgSubIndex = ostr.indexOf(">", beginIndex) + 1;
    int endIndex = indexArray.get(curPage - 1);
    int enSubIndex = ostr.lastIndexOf("<", endIndex);
    ostr = ostr.substring(bgSubIndex, enSubIndex);
   }
  }
  out.println("<div style= 'width:100%;overflow:auto '>");
  out.println(ostr);
  out.println("</div>");
  out.println("<table width='100%' height='32' border='1' align='left' cellpadding='0' cellspacing='0'>");
  out.println(" <tr valign='middle' style='background-color:#C3D5ED;'>");
  out.println("  <td width='10' style='border-width:0px'> </td>");
  out.println("  <td id='btnFirst' width='20' style='border-width:0px'>");
  if (curPage > 1) {
   out.println("  <a href='" + baseUrl
     + "&PB_PAGE=1'><img src='" + imgBaseUrl
     + "/icon_page_frist.gif' border='0'></a>");
  } else {
   out.println("  <img src='" + imgBaseUrl
     + "/icon_page_frist1.gif' border='0'>");
  }
  out.println("</td>");
  out.println("  <td id='btnPrev' width='20' style='border-width:0px'>");
  if (curPage > 1) {
   out.println("  <a href='" + baseUrl + "&PB_PAGE="
     + (curPage - 1) + "'><img src='" + imgBaseUrl
     + "/icon_page_prev.gif' border='0'></a>");
  } else {
   out.println("  <img src='" + imgBaseUrl
     + "/icon_page_prev1.gif' border='0'>");
  }
  out.println("</td>");
  out.println("  <td width='150' style='border-width:0px;font-Size:12px;'>");
  // out.println(new
  // String("第".getBytes("utf-8"),"ISO-8859-1")
  out.println("第"
    // +"<input id='curPage' type='text' style='width:35px;height:18px;' value='"+curPage+"' readOnly>"+new
    // String("页".getBytes("utf-8"),"ISO-8859-1")+" ");
    + "<input id='curPage' type='text' style='width:35px;height:18px;' value='"
    + curPage + "' readOnly>" + "页" + " ");
  // out.println(new
  // String("共".getBytes("utf-8"),"ISO-8859-1")
  out.println("共"
    // +"<input id='totalPage' type='text' style='width:35px;height:18px;' value='"+totalPage+"' readOnly>"+new
    // String("页".getBytes("utf-8"),"ISO-8859-1"));
    + "<input id='totalPage' type='text' style='width:35px;height:18px;' value='"
    + totalPage + "' readOnly>" + "页");
  out.println("  </td>");
  out.println("  <td id='btnNext' width='20' style='border-width:0px'>");
  if (curPage < totalPage) {
   out.println("  <a href='" + baseUrl + "&PB_PAGE="
     + (curPage + 1) + "'><img src='" + imgBaseUrl
     + "/icon_page_next.gif' border='0'></a>");
  } else {
   out.println("  <img src='" + imgBaseUrl
     + "/icon_page_next1.gif' border='0'>");
  }
  out.println("</td>");
  out.println("  <td id='btnLast' width='30' style='border-width:0px'>");
  if (curPage < totalPage) {
   out.println("  <a href='" + baseUrl + "&PB_PAGE="
     + totalPage + "'><img src='" + imgBaseUrl
     + "/icon_page_last.gif' border='0'></a>");
  } else {
   out.println("  <img src='" + imgBaseUrl
     + "/icon_page_last1.gif' border='0'>");
  }
  out.println("</td>");
  out.println("  <td width='140' style='border-width:0px;font-Size:12px;'>");
  // out.println(new
  // String("转到第".getBytes("utf-8"),"ISO-8859-1")
  out.println("转到第"
    // +"<input id='gotoPage' type='text' style='width:35px;height:18px;' value=''>"+new
    // String("页".getBytes("utf-8"),"ISO-8859-1"));
    + "<input id='gotoPage' type='text' style='width:35px;height:18px;' value=''>"
    + "页");
  out.println("   <img src='"
    + imgBaseUrl
    + "/application_go.png' onclick='javascript:gotoPage()'/></td>");
  out.println("  <td width='30' style='border-width:0px'><img src='"
    + imgBaseUrl
    + "/print.gif' style='cursor:pointer' onclick='window.print()'/></td>");
  out.println("  <td width='30' style='border-width:0px'><a href='"
    + baseUrl
    + "&O_FORMAT=pdf' target='_blank'><img border='0' src='"
    + imgBaseUrl + "/pdf.gif'/></a></td>");
  out.println("  <td width='30' style='border-width:0px'><a href='"
    + baseUrl
    + "&O_FORMAT=xls' target='_blank'><img border='0' src='"
    + imgBaseUrl + "/xls.gif'/></a></td>");
  out.println("  <td width='30' style='border-width:0px'><a href='"
    + baseUrl
    + "&O_FORMAT=doc' target='_blank'><img border='0' src='"
    + imgBaseUrl + "/doc.gif'/></a></td>");
  out.println("  <td style='border-width:0px'> </td>");
  out.println(" </tr>");
  out.println("</table>");
  out.println("<script type=\"text/javascript\">");
  out.println(" String.prototype.trim=function(){");
  out.println("  return this.replace(/(^\\s*)|(\\s*$)/g,'');");
  out.println(" }");
  out.println(" function gotoPage(){");
  out.println("  var spage = document.getElementById('gotoPage').value.trim();");
  out.println("  if(spage=='' || spage.indexOf('.')!=-1 || isNaN(spage)) {");
  // out.println("   alert('"+new
  // String("请输入整数".getBytes("utf-8"),"ISO-8859-1")+"');");
  out.println("   alert('" + "请输入整数" + "');");
  out.println("   return;");
  out.println("  }");
  out.println("  var ipage = parseInt(spage);");
  out.println("  window.location.href = \"" + baseUrl
    + "&PB_PAGE=\"+ipage;");
  out.println(" }");
  out.println("</script> ");
 } else { // 在浏览器端用js实现分页，提高访问速度，减轻对服务器的压力
  out.println("<div style= 'width:100%;overflow:auto '>");
  out.println(ostr);
  out.println("</div>");
  out.println("<table width='100%' height='32' border='1' align='left' cellpadding='0' cellspacing='0'>");
  out.println(" <tr valign='middle' style='background-color:#C3D5ED;'>");
  out.println("  <td width='10' style='border-width:0px'> </td>");
  out.println("  <td id='btnFirst' width='20' style='border-width:0px'><img src='"
    + imgBaseUrl + "/icon_page_frist1.gif'/></td>");
  out.println("  <td id='btnPrev' width='20' style='border-width:0px'><img src='"
    + imgBaseUrl + "/icon_page_prev1.gif'/></td>");
  out.println("  <td width='150' style='border-width:0px;font-Size:12px;'>");
  // out.println(new
  // String("第".getBytes("utf-8"),"ISO-8859-1")+"<input id='curPage' type='text' style='width:35px;height:18px;' readOnly>"+new
  // String("页".getBytes("utf-8"),"ISO-8859-1")+" ");
  out.println("第"
    + "<input id='curPage' type='text' style='width:35px;height:18px;' readOnly>"
    + "页" + " ");
  // out.println(new
  // String("共".getBytes("utf-8"),"ISO-8859-1")+"<input id='totalPage' type='text' style='width:35px;height:18px;' readOnly>"+new
  // String("页".getBytes("utf-8"),"ISO-8859-1"));
  out.println("共"
    + "<input id='totalPage' type='text' style='width:35px;height:18px;' readOnly>"
    + "页");
  out.println("  </td>");
  out.println("  <td id='btnNext' width='20' style='border-width:0px'><img src='"
    + imgBaseUrl + "/icon_page_next1.gif'/></td>");
  out.println("  <td id='btnLast' width='30' style='border-width:0px'><img src='"
    + imgBaseUrl + "/icon_page_last1.gif'/></td>");
  out.println("  <td width='140' style='border-width:0px;font-Size:12px;'>");
  // out.println(new
  // String("转到第".getBytes("utf-8"),"ISO-8859-1")+"<input id='gotoPage' type='text' style='width:35px;height:18px;' value=''>"+new
  // String("页".getBytes("utf-8"),"ISO-8859-1"));
  out.println("转到第"
    + "<input id='gotoPage' type='text' style='width:35px;height:18px;' value=''>"
    + "页");
  out.println("   <img src='"
    + imgBaseUrl
    + "/application_go.png' onclick='javascript:gotoPage()'/></td>");
  out.println("  <td width='30' style='border-width:0px'><img src='"
    + imgBaseUrl
    + "/print.gif' style='cursor:pointer' onclick='window.print()'/></td>");
  out.println("  <td width='30' style='border-width:0px'><a href='"
    + baseUrl
    + "&O_FORMAT=pdf' target='_blank'><img border='0' src='"
    + imgBaseUrl + "/pdf.gif'/></a></td>");
  out.println("  <td width='30' style='border-width:0px'><a href='"
    + baseUrl
    + "&O_FORMAT=xls' target='_blank'><img border='0' src='"
    + imgBaseUrl + "/xls.gif'/></a></td>");
  out.println("  <td width='30' style='border-width:0px'><a href='"
    + baseUrl
    + "&O_FORMAT=doc' target='_blank'><img border='0' src='"
    + imgBaseUrl + "/doc.gif'/></a></td>");
  out.println("  <td style='border-width:0px'> </td>");
  out.println(" </tr>");
  out.println("</table>");
  out.println("<script type=\"text/javascript\">");
  out.println(" var pageArray = [];");
  out.println(" var div_list = document.getElementsByTagName('div');");
  out.println(" for(var i=0; i<div_list.length; i++){  ");
  out.println("  if(div_list[i].innerHTML=='page separator')  {");
  out.println("   div_list[i].style.display='none';");
  out.println("   if(pageArray.length==0){");
  out.println("    pageArray[0] = div_list[i].previousSibling;");
  out.println("   }");
  out.println("   pageArray[pageArray.length] = div_list[i].nextSibling;");
  out.println("  }");
  out.println(" }");
  out.println(" function displayPage(ipage){");
  out.println("  if(pageArray.length==1){");
  out.println("   ipage = 1;");
  out.println("   document.getElementById('btnFirst').innerHTML= \"<img src='"
    + imgBaseUrl
    + "/icon_page_frist1.gif' style='cursor:default'/>\";");
  out.println("   document.getElementById('btnPrev').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_prev1.gif' style='cursor:default'/>\";");
  out.println("   document.getElementById('btnNext').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_next1.gif' style='cursor:default'/>\";");
  out.println("   document.getElementById('btnLast').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_last1.gif' style='cursor:default'/>\";");
  out.println("  }else{");
  out.println("   if(ipage<=1){");
  out.println("    ipage = 1;");
  out.println("    document.getElementById('btnFirst').innerHTML= \"<img src='"
    + imgBaseUrl
    + "/icon_page_frist1.gif' style='cursor:default'/>\";");
  out.println("    document.getElementById('btnPrev').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_prev1.gif' style='cursor:default'/>\";");
  out.println("    document.getElementById('btnNext').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_next.gif' style='cursor:pointer' onclick='javascript:nextPage()'/>\";");
  out.println("    document.getElementById('btnLast').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_last.gif' style='cursor:pointer' onclick='javascript:lastPage()'/>\";");
  out.println("   }else if(ipage>=pageArray.length){");
  out.println("    ipage = pageArray.length;");
  out.println("    document.getElementById('btnFirst').innerHTML= \"<img src='"
    + imgBaseUrl
    + "/icon_page_frist.gif' style='cursor:pointer' onclick='javascript:firstPage()'/>\";");
  out.println("    document.getElementById('btnPrev').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_prev.gif' style='cursor:pointer' onclick='javascript:prevPage()'/>\";");
  out.println("    document.getElementById('btnNext').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_next1.gif' style='cursor:default'/>\";");
  out.println("    document.getElementById('btnLast').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_last1.gif' style='cursor:default'/>\";");
  out.println("   }else{");
  out.println("    document.getElementById('btnFirst').innerHTML= \"<img src='"
    + imgBaseUrl
    + "/icon_page_frist.gif' style='cursor:pointer' onclick='javascript:firstPage()'/>\";");
  out.println("    document.getElementById('btnPrev').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_prev.gif' style='cursor:pointer' onclick='javascript:prevPage()'/>\";");
  out.println("    document.getElementById('btnNext').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_next.gif' style='cursor:pointer' onclick='javascript:nextPage()'/>\";");
  out.println("    document.getElementById('btnLast').innerHTML = \"<img src='"
    + imgBaseUrl
    + "/icon_page_last.gif' style='cursor:pointer' onclick='javascript:lastPage()'/>\";");
  out.println("   }");
  out.println("  }");
  out.println("  for(var i=0; i<pageArray.length;i++){");
  out.println("   if(i==(ipage-1)){");
  out.println("    pageArray[i].style.display='inline';");
  out.println("   }else{");
  out.println("    pageArray[i].style.display='none';");
  out.println("   }");
  out.println("  }");
  out.println("  document.getElementById('curPage').value = ipage;");
  out.println(" }");
  out.println(" function firstPage(){");
  out.println("  displayPage(1);");
  out.println(" }");
  out.println(" function prevPage(){");
  out.println("  var spage = document.getElementById('curPage').value;");
  out.println("  var ipage = parseInt(spage)-1;");
  out.println("  displayPage(ipage);");
  out.println(" }");
  out.println(" function nextPage(){");
  out.println("  var spage = document.getElementById('curPage').value;");
  out.println("  var ipage = parseInt(spage)+1;");
  out.println("  displayPage(ipage);");
  out.println(" }");
  out.println(" function lastPage(){");
  out.println("  displayPage(pageArray.length);");
  out.println(" }");
  out.println(" String.prototype.trim=function(){");
  out.println("  return this.replace(/(^\\s*)|(\\s*$)/g,'');");
  out.println(" }");
  out.println(" function gotoPage(){");
  out.println("  var spage = document.getElementById('gotoPage').value.trim();");
  out.println("  if(spage=='' || spage.indexOf('.')!=-1 || isNaN(spage)) {");
  // out.println("   alert('"+new
  // String("请输入整数".getBytes("utf-8"),"ISO-8859-1")+"');");
  out.println("   alert('" + "请输入整数" + "');");
  out.println("   return;");
  out.println("  }");
  out.println("  var ipage = parseInt(spage);");
  out.println("  displayPage(ipage);");
  out.println(" }");
  out.println(" document.getElementById('totalPage').value=pageArray.length;");
  out.println(" firstPage();");
  out.println("</script> ");
 }
 out.println("</body>");
 out.println("</html>");
 out.flush();
 out.close();
 ostream.close();
} else {// 导出文件
 RenderOption options;
 if (outFormat.equals("pdf")) {
  resp.setContentType("application/pdf");
  resp.setHeader("Content-Disposition",
    "attachment; filename=export.pdf");
  options = new PDFRenderOption();
  options.setOutputFormat(RenderOption.OUTPUT_FORMAT_PDF);
 } else {
  if (outFormat.equals("xls")) {
   resp.setContentType("application/msexcel");
   resp.setHeader("Content-disposition",
     "attachment; filename=export.xls");
  } else if (outFormat.equals("doc")) {
   resp.setContentType("application/msword");
   resp.setHeader("Content-disposition",
     "attachment; filename=export.doc");
  } else {
   resp.setContentType("text/html");
  }
  options = new HTMLRenderOption();
  options.setOutputFormat(RenderOption.OUTPUT_FORMAT_HTML);
 }
 options.setOutputStream(resp.getOutputStream());
 IRunAndRenderTask task = birtReportEngine
   .createRunAndRenderTask(design);// 不生成document文件
 if (parameters != null && !parameters.isEmpty()) {
  task.setParameterValues(parameters);// 设置报表参数
  task.validateParameters();
 }
 task.setRenderOption(options);
 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 {
  this.doGet(request, response);
 }
 /**
  * Initialization of the servlet.
  * 
  * @throws ServletException
  *             if an error occure
  */
 public void init() throws ServletException {
  BirtEngine.initBirtConfig();
 }
}


 

这个servlet其实很简单，就是调用自定义的report engine往客户端输出了HTML格式的报表render显示，还在网客户端打印了一些资源，其中包含一些用于导航的图表文件，放置在report/reports/images下

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

WEB-INF下面的文件如下：

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

其中classes放置定制的BirtEngine和ReportServlet，lib用于放置runtime ReportEngine类库，web.xml内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app id="WebApp">
		<servlet>
		<servlet-name>WebReport</servlet-name>
		<servlet-class>birtbird.ReportServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>WebReport</servlet-name>
		<url-pattern>/webReport</url-pattern>
	</servlet-mapping>
</web-app>


这样我们可以访问/report/webReport?ReportName=customerOrders.rptdesign&customerno=114来访问customer.rptdesign，也可以用如下的方式：

<%@ page contentType="text/html;charset=GBK" %>
<%@ page import = "javax.servlet.http.*" %>
<%@ include file="/includes/jsp/init.jsp"%>
<% 
String report_url = "/report/webReport?ReportName=customerOrders.rptdesign&customerno=114";
%>
<script language="javascript">
	location.href="<%=report_url%>";
</script>

源码中我们把报表的访问路径设置成了report/reports下，

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

customerOrders.rptdesign报表的设计如下：

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

其中包含参数customerno，默认值是114

在自定义的报表查看器中预览如下（注意导航栏和工具栏在一起，都在下面）：

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

翻到第4页

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

导出的excel：

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

导出的word：

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器

实际上我们还能利用报表展示器的扩展点开发一个自定义的eclipse插件类型的报表展示器，这种方式能直接调用BIRT已经封装好的viewer

plugin.xml的内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>
   <extension
         id="application"
         point="org.eclipse.core.runtime.applications">
      <application>
         <run
               class="org.eclipse.birt.examples.rcpviewer.Application">
         </run>
      </application>
   </extension>
   <extension
         point="org.eclipse.ui.perspectives">
      <perspective
            name="Perspective"
            class="org.eclipse.birt.examples.rcpviewer.Perspective"
            id="org.eclipse.birt.examples.rcpviewer.perspective">
      </perspective>
   </extension>
   <extension
         point="org.eclipse.ui.views">
      <view
            name="View"
            class="org.eclipse.birt.examples.rcpviewer.View"
            id="org.eclipse.birt.examples.rcpviewer.view">
      </view>
   </extension>
   <extension
         point="org.eclipse.birt.report.viewer.appcontext">
      <appcontext
            class="org.eclipse.birt.examples.rcpviewer.MyAppContext">
      </appcontext>
   </extension>
</plugin>

RCP客户端程序最终运行效果如下：

第十三章 BIRT表格引擎API及报表API (续)-自定义web BIRT展示器
至于如何扩展BIRT报表的API，第十四章会详细描述。

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