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📄 list_html_report.java

📁 一个专门用来快速开发网站的框架
💻 JAVA
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package com.core.report;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.util.HashMap;
import java.util.Map;

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.hibernate.Session;
import net.sf.jasperreports.engine.JRException;
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.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.util.JRLoader;

import com.core.persistence.HibernateUtil;


/**
 * @author Bluewater
 *
 * TODO 要更改此生成的类型注释的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
public class List_HTML_Report extends HttpServlet{


    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doTask(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doTask(request, response);
    }

    public void doTask(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.reset();
        // 获得参数
        String strFileName = request.getParameter("r_file");
        String strClassName = request.getParameter("r_class");
        System.out.println("L_HTML_Report：：doTask  ---  strFileName="+strFileName);
        System.out.println("L_HTML_Report：：doTask  ---  strClassName="+strClassName);

        ServletContext context = this.getServletConfig().getServletContext();
        response.setContentType("text/html; charset=gb2312");
        PrintWriter out = response.getWriter();

        try {
            // 1、生成JasperReport
            File reportFile = new File(context.getRealPath(strFileName));
            JasperReport jasperReport = (JasperReport) JRLoader.loadObject(reportFile.getPath());

            // 2、调用接口得到参数。
            BaseReport br = (BaseReport)Class.forName(strClassName).newInstance();
            Map parameters = br.getReportParameter(request);
            System.out.println("L_HTML_Report：：doTask  ---  parameters="+parameters.toString());
            // 3、得到数据库连接
            Session session = HibernateUtil.getSession();
            Connection conn = session.connection();

            // 4、生成JasperPrint
            JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);

            Map imagesMap = new HashMap();
            request.getSession().setAttribute("IMAGES_MAP", imagesMap);

            // 新建JRHtmlExporter，设置参数。
            JRHtmlExporter exporter = new JRHtmlExporter();
            exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_WRITER, out);
            exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
            exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "reports/");
            exporter.exportReport();

        } catch (JRException jre) {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>JasperReports - Web Application Sample</title>");
            out.println("<link rel=\"stylesheet\" type=\"text/css\" href=\"../stylesheet.css\" title=\"Style\">");
            out.println("</head>");
            out.println("<body bgcolor=\"white\">");
            out.println("<span class=\"bnew\">JasperReports encountered this error :</span>");
            out.println("<pre>");
            jre.printStackTrace(out);
            out.println("</pre>");
            out.println("</body>");
            out.println("</html>");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

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