报表应用中有时报表只需生成指定文件，而无需在页面展现，生成的文件常见于Excel、PDF等。由于报表不展现，也就无需使用报表提供的tag，可以直接通过程序导出。集算报表提供了丰富的API，允许开发人员编写代码实现自己的业务逻辑。这里通过在servlet中导出Excel为例来看一下报表不展现而直接导出的实现方式。
定义导出Excel的servlet（ExportToExcel），主要代码如下：
1、接收参数
String report =request.getParameter("rpx");
String year = request.getParameter("year");
2、读入报表
String reportFile =request.getSession().getServletContext().getRealPath("/reportFiles/"+report);
3、读入并计算报表
Context cxt = new Context();
ReportDefine rd =(ReportDefine)ReportUtils.read(reportFile);
cxt.setParamValue("year", year);
Engine engine = new Engine(rd, cxt);
IReport iReport = engine.calc();
4、导出Excel
ReportUtils.exportToExcel("D:/result.xls",iReport, true);
根据页面超链接访问上述servlet，并传递参数，如：
http://192.168.1.102:8080/rpx_demo/servlet/ExportToExcel?rpx=order.rpx&year=1996即可直接生成Excel文件，而无需展现报表。
导出的Excel效果如下：
集算报表提供了多个导出Excel的方法，除了可以导出xls格式，也可以导出xlsx格式文件，开发人员可以根据需求选择导出Excel的方法：
ReportUtils.exportToExcel(java.io.OutputStream os, IReport report,boolean pageBroken);
ReportUtils.exportToExcel(java.io.OutputStream os, IReport report,boolean pageBroken, int dispRatio);
ReportUtils.exportToExcel(java.lang.String fileName, IReport report,boolean pageBroken);
ReportUtils.exportToExcel(java.lang.String fileName, IReport report,boolean pageBroken, int dispRatio);
ReportUtils.exportToExcel 2007(java.lang.String fileName,IReportreport,boolean pageBroken)
ReportUtils.exportToExcel 2007(java.io.OutputStream os,IReportreport,boolean pageBroken)
导出PDF与导出Excel类似，调用相应导出PDF的方法即可，集算报表提供导出PDF的方法包括：
ReportUtils.exportToPDF(java.io.OutputStream os, IReport report);
ReportUtils.exportToPDF(java.io.OutputStream os, IReport report,boolean pageBroken, boolean graphicOut)
ReportUtils.exportToPDF(java.lang.String fileName, IReport report);
ReportUtils.exportToPDF(java.lang.String fileName, IReport report,boolean pageBroken, boolean graphicOut)
【附】导出Excel完整代码
package com.runqian.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.raqsoft.report.model.ReportDefine;
import com.raqsoft.report.usermodel.Context;
import com.raqsoft.report.usermodel.Engine;
import com.raqsoft.report.usermodel.IReport;
import com.raqsoft.report.usermodel.ParamMetaData;
import com.raqsoft.report.util.ReportUtils;
publicclassExportToExcel extends HttpServlet {
/**
* Constructor of the object.
*/
public ExportToExcel() {
super();
}
/**
* Destruction of the servlet. <br>
*/
publicvoid destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has itstag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
publicvoiddoGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException {
Stringreport = request.getParameter("rpx");
Stringyear = request.getParameter("year");
//保证报表名称的完整性
int iTmp = 0;
if( (iTmp =report.lastIndexOf(".rpx")) <= 0 ){
report= report + ".rpx";
iTmp= 0;
}
StringreportFile = request.getSession().getServletContext().getRealPath("/reportFiles/"+report);
Contextcxt = newContext();
try {
ReportDefinerd = (ReportDefine)ReportUtils.read(reportFile);
cxt.setParamValue("year", year);
Engineengine = newEngine(rd, cxt); //构造报表引擎
IReportiReport = engine.calc(); //运算报表
ReportUtils.exportToExcel("D:\\result.xls",iReport, true);
}catch(Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has itstag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
publicvoiddoPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException {
response.setContentType("text/html");
PrintWriterout = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
publicvoid init() throws ServletException {
// Put your code here
}
}本文出自 “高性能报表数据计算” 博客，请务必保留此出处http://report5.blog.51cto.com/8028595/1635941
原文地址：http://report5.blog.51cto.com/8028595/1635941
