在Excel文件中导出Jtable

嗨，我是新手在Java编程，但这里是我的问题，我正在devisegraphics用户界面，做一些计算，需要显示input和输出在J表，然后将其导出到Excel文件

代码工作的魅力，但是当我打开Excel文件，我觉得它是空的..

j表

import java.awt.Desktop; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.UnsupportedEncodingException; import javax.swing.JFileChooser; public class Export extends javax.swing.JFrame { public Export() { initComponents(); } @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jScrollPane1 = new javax.swing.JScrollPane(); jTable1 = new javax.swing.JTable(); jButton1 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jTable1.setModel(new javax.swing.table.DefaultTableModel( new Object [][] { {"Channel Model", global.channel_model, global.channel_model}, {"System Bandwidth (MHz)", global.band_width_index, global.band_width_index}, {"Cell Edge Rate (Kbps)", global.Rreq_UL, global.Rreq_DL}, {"Cell edge MCS", global.mcs, global.mcs}, {"Antenna Configuration", global.DL_antenna_config, global.DL_antenna_config}, {"Total RB Number", global.number_of_RB, global.number_of_RB}, {"Tx", "", null}, {"Max Power (dBm)", global.UE_Tx_power, global.UE_Tx_power}, {"Cable Loss (dB)", global.cable_loss, global.cable_loss}, {"Body Loss (dB)", global.body_loss, global.body_loss}, {"Antenna Gain (dB)", global.UE_antennaGain, global.UE_antennaGain}, {"EIRB (dB)", "", null}, {"Rx", null, null}, {"Antenna Gain (dB)", global.UE_antennaGain, global.UE_antennaGain}, {"Cable Loss (dB)", global.cable_loss, global.cable_loss}, {"Body Loss (dB)", global.body_loss, global.body_loss}, {"Noise Figure (dB)", global.UE_noiseFigure, global.UE_noiseFigure}, {"Thermal Noise (dB)", null, null}, {"Interference Margin (dB)", global.Biul, global.Bidl}, {"SINR (dB)", global.SINR, global.DL_SINR}, {"Reciver Sensitivty (dB)", "", null}, {"MAPL", null, null}, {"Diversity (dB)", global.Tx_diversity_gain, global.Tx_diversity_gain}, {"Shadow Fading Margin (dB)", global.shadow_margin, global.shadow_margin}, {"MAPL (dB)", null, null}, {"Cell Radius (Km)", global.R, global.R}, {"Area of Dimensioning (Km squar", global.site_area, global.site_area}, {"Site Type", global.type_of_site, global.type_of_site}, {"Number of Sites Due to Coverage", "", null} }, new String [] { "Summary", "Uplink", "Downlink" } )); jTable1.setName("Export"); jScrollPane1.setViewportView(jTable1); jTable1.getAccessibleContext().setAccessibleName("\"Export\""); jTable1.getAccessibleContext().setAccessibleDescription(""); jButton1.setText("Export"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap(562, Short.MAX_VALUE) .addComponent(jButton1) .addContainerGap()) .addComponent(jScrollPane1) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 455, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton1) .addGap(0, 0, Short.MAX_VALUE)) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { try{ JFileChooser fileChooser = new JFileChooser(); int retval = fileChooser.showSaveDialog(jButton1); if (retval == JFileChooser.APPROVE_OPTION) { File file = fileChooser.getSelectedFile(); if (file != null) { if (!file.getName().toLowerCase().endsWith(".xls")) { file = new File(file.getParentFile(), file.getName() + ".xls"); } try { ExcelExporter exp=new ExcelExporter(); exp.exportTable(jTable1, file); Desktop.getDesktop().open(file); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); System.out.println("not found"); } catch (IOException e) { e.printStackTrace(); } } } }catch(Exception e){ System.out.println("shit"); } } public static void main(String args[]) { try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(Export.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(Export.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(Export.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Export.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new Export().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTable jTable1; // End of variables declaration } 

excel生成器类

 import java.io.*; import javax.swing.table.TableModel; import javax.swing.*; public class ExcelExporter { ExcelExporter(){} public void exportTable(JTable jTable1,File file) throws IOException{ TableModel model=jTable1.getModel(); FileWriter out=new FileWriter(file); BufferedWriter bw=new BufferedWriter(out); for (int i=0;i<model.getColumnCount();i++){ bw.write(model.getColumnName(i)+"\t"); } bw.write("\n"); for (int i=0;i<model.getRowCount();i++){ for (int j=0;j<model.getColumnCount();j++){ bw.write(model.getValueAt(i,j).toString()+"\t"); } bw.write("\n"); } bw.close(); System.out.print("Write out to"+file); } } 

Answer 1

为了编写和操作Excel文件，请使用Apache POI http://poi.apache.org/

如果您想自己创buildExcel文件而不使用外部库，请记住，Excel文件数据以XML Spreadsheet的forms存储，所以您将不得不创build类似于

 <?xml version="1.0"?> <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40"> <Worksheet ss:Name="Sheet1"> <Table ss:ExpandedColumnCount="2" ss:ExpandedRowCount="2" x:FullColumns="1" x:FullRows="1"> <Row> <Cell><Data ss:Type="String">Name</Data></Cell> <Cell><Data ss:Type="String">Example</Data></Cell> </Row> <Row> <Cell><Data ss:Type="String">Value</Data></Cell> <Cell><Data ss:Type="Number">123</Data></Cell> </Row> </Table> </Worksheet> </Workbook> 

来源： http : //en.wikipedia.org/wiki/Microsoft_Excel

Answer 2

正如已经推荐的，Apache POI是用于处理和创buildExcel文档的非常好的api。 它是免费的，开源的，所以很容易使用。 如果你试试看，那么这里有一个方法可以创build你的文件：

 private static void writeToExcell(JTable table, Path path) throws FileNotFoundException, IOException { new WorkbookFactory(); Workbook wb = new XSSFWorkbook(); //Excell workbook Sheet sheet = wb.createSheet(); //WorkSheet Row row = sheet.createRow(2); //Row created at line 3 TableModel model = table.getModel(); //Table model Row headerRow = sheet.createRow(0); //Create row at line 0 for(int headings = 0; headings < model.getColumnCount(); headings++){ //For each column headerRow.createCell(headings).setCellValue(model.getColumnName(headings));//Write column name } for(int rows = 0; rows < model.getRowCount(); rows++){ //For each table row for(int cols = 0; cols < table.getColumnCount(); cols++){ //For each table column row.createCell(cols).setCellValue(model.getValueAt(rows, cols).toString()); //Write value } //Set the row to the next one in the sequence row = sheet.createRow((rows + 3)); } wb.write(new FileOutputStream(path.toString()));//Save the file } 

另一种方法是学习Microsoft Excel文件规范，然后手动创buildExcel文件。 你现在正在做的是把你的表中的数据写到一个文件中，而不是Excel应用程序能够理解它的任何方式。