jasperreport项目演练

import java.io.PrintWriter; import java.io.StringWriter; import java.net.URL; import javax.swing.JOptionPane; import net.sf.jasperreports.engine.JasperPrint; import net.sf.jasperreports.engine.JasperPrintManager; import net.sf.jasperreports.engine.util.JRLoader; public class JRViewApplet extends javax.swing.JApplet { private URL url = null; private JasperPrint jasperPrint = null; public JRViewApplet() { } public void init() { String strUrl = getParameter("REPORT_URL"); if (strUrl != null) { try { url = new URL(getCodeBase(), strUrl); } catch (Exception e) { StringWriter swriter = new StringWriter(); PrintWriter pwriter = new PrintWriter(swriter); e.printStackTrace(pwriter); JOptionPane.showMessageDialog(this, swriter.toString()); } } else { JOptionPane.showMessageDialog(this, "Source URL not specified"); } } @Override public void start() { // initComponents(); if (url != null) { try { if (jasperPrint == null) { jasperPrint = (JasperPrint) JRLoader.loadObject(url); } if (jasperPrint != null) { ViewerFrame viewerFrame = new ViewerFrame(this .getAppletContext(), jasperPrint); viewerFrame.show(); } else { JOptionPane.showMessageDialog(this, "空报表！"); } } catch (Exception e) { StringWriter swriter = new StringWriter(); PrintWriter pwriter = new PrintWriter(swriter); e.printStackTrace(pwriter); JOptionPane.showMessageDialog(this, swriter.toString()); } } else { JOptionPane.showMessageDialog(this, "Source URL not specified"); } } private void initComponents() { pnlMain = new javax.swing.JPanel(); btnPrint = new javax.swing.JButton(); btnView = new javax.swing.JButton(); // btnPrint.setText("打印报表"); // btnPrint.addActionListener(new java.awt.event.ActionListener() { // public void actionPerformed(java.awt.event.ActionEvent evt) { // btnPrintActionPerformed(evt); // } // }); // pnlMain.add(btnPrint); btnView.setText("预览报表"); btnView.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btnViewActionPerformed(evt); } }); pnlMain.add(btnView); getContentPane().add(pnlMain, java.awt.BorderLayout.WEST); } /** * 预览报表 * * @param evt */ protected void btnViewActionPerformed(java.awt.event.ActionEvent evt) { if (url != null) { try { if (jasperPrint == null) { jasperPrint = (JasperPrint) JRLoader.loadObject(url); } if (jasperPrint != null) { ViewerFrame viewerFrame = new ViewerFrame(this .getAppletContext(), jasperPrint); viewerFrame.show(); } else { JOptionPane.showMessageDialog(this, "空报表！"); } } catch (Exception e) { StringWriter swriter = new StringWriter(); PrintWriter pwriter = new PrintWriter(swriter); e.printStackTrace(pwriter); JOptionPane.showMessageDialog(this, swriter.toString()); } } else { JOptionPane.showMessageDialog(this, "Source URL not specified"); } } /** * 打印报表 * * @param evt */ protected void btnPrintActionPerformed(java.awt.event.ActionEvent evt) { if (url != null) { if (jasperPrint == null) { try { jasperPrint = (JasperPrint) JRLoader.loadObject(url); } catch (Exception e) { StringWriter swriter = new StringWriter(); PrintWriter pwriter = new PrintWriter(swriter); e.printStackTrace(pwriter); JOptionPane.showMessageDialog(this, swriter.toString()); } } if (jasperPrint != null) { final JasperPrint print = jasperPrint; Thread thread = new Thread(new Runnable() { public void run() { try { JasperPrintManager.printReport(print, true); } catch (Exception e) { StringWriter swriter = new StringWriter(); PrintWriter pwriter = new PrintWriter(swriter); e.printStackTrace(pwriter); JOptionPane.showMessageDialog(null, swriter .toString()); } } }); thread.start(); } else { JOptionPane.showMessageDialog(this, "空报表！"); } } else { JOptionPane.showMessageDialog(this, "Source URL not specified"); } } private javax.swing.JPanel pnlMain; private javax.swing.JButton btnView; private javax.swing.JButton btnPrint; }