struts2整合jasper模版生成PDF导出下载<四>

（2）先生成pdf文件，然后通过strut2下载：

response.setHeader("Cache-Control", "public"); 
response.setHeader("Pragma", "public"); 					//response.setHeader("Content-Disposition", "attachment; filename=" + docName+".pdf");
					response.setContentType("application/pdf");
					String reportBasePath = ServletActionContext.getServletContext().getRealPath(DOWNLOADFILEPATH);
					//System.out.println("reportBasePath....is : "+reportBasePath);
					String template =  reportBasePath+"/"+"convenientVisa.jasper";
					//System.out.println("template....is : "+template);
					String reportOutputBasePath = ServletActionContext.getServletContext().getRealPath(DOWNLOADFILEPATH);
					String pdfCn = ReportUtil.createReportName(pdfNameCn,reportType);
					String pdfEn = ReportUtil.createReportName(pdfNameEn,reportType);
					String outputFileCn = reportOutputBasePath +"/"+ pdfCn;
					String outputFileEn = reportOutputBasePath +"/"+ pdfEn;
					//System.out.println("outputFileCn....is : "+outputFileCn);
					//System.out.println("outputFileEn....is : "+outputFileEn);
					if(!new File(template).exists()){
						//System.out.println("报表模版不存在");
						throw new Exception("报表模版不存在");
					}
					 
	
						File reportOutputBaseFile = new File(reportBasePath + reportOutputBasePath);
						if(!reportOutputBaseFile.exists())reportOutputBaseFile.mkdirs();
						
						//确定要导出的文件的名称	
						if(url.indexOf("/cn/")>-1){
							ReportUtil.exportReports(ffpTravelDetailList, reportParameter,ReportUtil.REPORT_FORMAT_PDF,template, outputFileCn);
						}else{
							ReportUtil.exportReports(ffpTravelDetailList, reportParameter,ReportUtil.REPORT_FORMAT_PDF,template, outputFileEn);
						}
						
						//InputStream in = ServletActionContext.getServletContext().getResourceAsStream(outputFile);


public boolean regex(String regex, String str) {
		Pattern p = Pattern.compile(regex, Pattern.MULTILINE);
		Matcher m = p.matcher(str);
		return m.find();
	}

获取登录用户以及链接地址：

LpAccount user=(LpAccount) ActionContext.getContext().getSession().get("user");//获取登录用户名
String url = ServletActionContext.getRequest().getRequestURL().toString();//获取响应的链接地址

获取文件，这个必须有：

// 从下载文件原始存放路径读取得到文件输出流

	public InputStream getDownloadFile() {
		String url = ServletActionContext.getRequest().getRequestURL().toString();
		if(url.indexOf("/cn/")>-1){
			return ServletActionContext.getServletContext().getResourceAsStream(
					DOWNLOADFILEPATH + pdfNameCn+".pdf");
		}else{
			return ServletActionContext.getServletContext().getResourceAsStream(
					DOWNLOADFILEPATH + pdfNameEn+".pdf");
		}		
		
	}

ReportUtil.java

package com.csair.skypearl.utils;

import java.io.PrintWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRExporter;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.export.JRXlsExporter;
import net.sf.jasperreports.engine.export.ooxml.JRDocxExporter;
import net.sf.jasperreports.engine.export.ooxml.JRXlsxExporter;
import net.sf.jasperreports.j2ee.servlets.ImageServlet;

import org.apache.commons.lang.time.DateFormatUtils;
import org.apache.struts2.ServletActionContext;

public class ReportUtil {
	public static final String REPORT_FORMAT_XLS = "XLS";
	public static final String REPORT_FORMAT_XLSX = "XLSX";
	public static final String REPORT_FORMAT_DOC = "DOC";
	public static final String REPORT_FORMAT_PDF = "PDF";
	public static final String REPORT_FORMAT_HTML = "HTML";

	/**
	 * <B>导出报表</B><br />
	 * create by:vakin 
	 *             at:2011-1-7
	 * @param <T>
	 * @param reportDatas
	 * @param parameters
	 * @param exportType
	 * @param template
	 * @param outputFile
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public static <T> void exportReports(List<T> reportDatas,
			Map parameters,String exportType, String template, String outputFile) throws Exception {
		 
		//HttpServletRequest request =  ServletActionContext.getRequest();
		JasperReport jasperreport = DynamicColumnReport.dynamicColumnReport( null, template); //根据参数判断是否需要动态生成列
		JasperPrint print = JasperFillManager.fillReport(jasperreport,parameters,new JRBeanCollectionDataSource(reportDatas));

		JRExporter exporter = null;
		
		if(REPORT_FORMAT_XLS.equalsIgnoreCase(exportType)){
			exporter = new JRXlsExporter();
		}else if(REPORT_FORMAT_DOC.equalsIgnoreCase(exportType)){
			exporter = new JRDocxExporter();
		}else if(REPORT_FORMAT_PDF.equalsIgnoreCase(exportType)){
			exporter = new JRPdfExporter();
		}else if(REPORT_FORMAT_HTML.equalsIgnoreCase(exportType)){
			exporter = new JRHtmlExporter();
		}else if(REPORT_FORMAT_XLSX.equalsIgnoreCase(exportType)){
			exporter = new JRXlsxExporter();
		}
		exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,
				outputFile);

		exporter.setParameter(JRExporterParameter.JASPER_PRINT, print);

		exporter.exportReport();

	
	}
	
	/**
	 * <B>输出报表图</B><br />
	 * create by:vakin 
	 *             at:2011-1-7
	 * @param <T>
	 * @param reportDatas
	 * @param parameters
	 * @param template
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public static <T> void createReportChart(List<T> reportDatas,
			Map parameters, String template) throws Exception {

		HttpServletResponse response = ServletActionContext.getResponse();
		PrintWriter printWriter = response.getWriter();

		JasperPrint jasperPrint = JasperFillManager.fillReport(template,
				new HashMap(), new JRBeanCollectionDataSource(reportDatas));
		JRHtmlExporter htmlExporter = new JRHtmlExporter();
		response.setContentType("text/html");
		ServletActionContext.getRequest().getSession().setAttribute(
				ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE,
				jasperPrint);

		htmlExporter.setParameter(JRExporterParameter.JASPER_PRINT,
				jasperPrint);
		htmlExporter.setParameter(JRExporterParameter.OUTPUT_WRITER,
				printWriter);
		htmlExporter.setParameter(
				JRHtmlExporterParameter.CHARACTER_ENCODING, "utf-8");
		String imageUrl = "reportChart?__r="+ System.currentTimeMillis() +"&image=";
		htmlExporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,
				imageUrl);
		htmlExporter.exportReport();
		printWriter.flush();
		printWriter.close();
	}
	
	public static String getReportBasePath(){
		return ServletActionContext.getServletContext().getRealPath("/jasreportTemplete/");
	}
	
	public static String createReportName(String modelName,String docType){
		return modelName  +  "."+docType.toLowerCase();
	}

}

值得注意的是：对于ie7及以下版本的浏览器必须设置浏览器相应头的缓存设置：
网上有解释：This is a typical MSIE error message when a download is been provided over HTTPS (SSL) while the response headers are been set to disable the browser cache

添加的代码：

response.setHeader("Cache-Control", "public"); 
response.setHeader("Pragma", "public");

对于火狐浏览器，有可能文件名过长，而背截取，导致文件类型错误，无法下载打开等，可以作如下设置：

String browser = this.getRequest().getHeader("User-Agent");

if(browser != null && browser.indexOf("MSIE") == -1) { 
				if(!(url.indexOf("/cn/")>-1)){		
					 docmNameEn = "=?UTF-8?B?" + (new String (Base64.encodeBase64(docmNameEn.getBytes("UTF-8")))) + "?=";  
				}			
			}

struts2配置文件：

<param name="fileName">${docNameEn}.pdf</param>  
            <result name="download" type="stream">  
                <!-- 下载文件类型定义 -->  
                <param name="contentType">application/pdf</param>  
                <!-- 下载文件处理方法 -->  
                <param name="contentDisposition">  
                    attachment;filename="${docNameEn}.pdf"  
                </param>  
                <!-- 下载文件输出流定义 -->  
                <param name="inputName">downloadFile</param>  
           </result>

对于中文文件名的处理：

String docmName=new String(new String(pdfNameCn).getBytes("GBK"),"ISO8859-1");
String docmNameEn = new String(new String(pdfNameEn).getBytes("GBK"),"ISO8859-1");

struts2的一些配置也可以直接在java类里面设置：

response.setHeader("Content-Disposition", "attachment; filename=" + docName+".pdf");//[color=red]attachment表示下载，inline表示在线查看[/color]
					response.setContentType("application/pdf");//文件格式设置，具体可百度ContentType

还需要注意：如果项目发布在linux上，需注意，windows上的“/”对应linux上的“\”，但是windows上这个不用区别开来，都可以识别路径