Jtable变得不可见?

本文介绍了Jtable变得不可见?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在我的以下代码中，通过单击添加"&搜索按钮.但是在单击获取值"后，它没有显示"Jtable2"，它的名称为"jTable2.setModel(new DefaultTableModel(data3，columns2));". 这里是两个Jtables.单击获取值"后分配Jtable2 代码是:

In my following code I am successfully able to show data in table by clicking on "Add" & search button. But after clicking "Get values" it is not showing the "Jtable2" which is given as "jTable2.setModel(new DefaultTableModel(data3, columns2));" Here their are two Jtables. Jtable2 is assigned after click on "Get Values" The code is:

package com.ash; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.table.DefaultTableModel; import javax.swing.JLabel; import javax.swing.GroupLayout.Alignment; import javax.swing.GroupLayout; import javax.swing.LayoutStyle.ComponentPlacement; import javax.swing.JButton; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.JPanel; public class ReportD extends javax.swing.JFrame { static Object[][] data ; static Object[][] data2; static Object[] columns={"FirstName","LastName","Age","RefDoctor","Sex","RegId","test"}; public static int NumOfCol; public Object[] columns2; static Object[][] data3; Connection con; Connection con2,con3; ResultSet rs,rs1,rs2,rs3; Statement stmt=null; Statement stmt2=null; Statement stmt3=null; int k=0; PreparedStatement pr,pr2,pr3; String Gid,Gtest; public ReportD() { initComponents(); } private void initComponents() { jButton1 = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); table = new javax.swing.JTable(); jTextField1 = new javax.swing.JTextField(); jButton2 = new javax.swing.JButton(); jLabel1 = new javax.swing.JLabel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("Report"); //jtable1 jButton1.setText("Add"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { try { jButton1ActionPerformed(evt); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); table.setModel(new javax.swing.table.DefaultTableModel( new Object [][] { {null, null, null, null, null, null,null}, }, new String [] { "First Name", "Last Name", "Age", "Ref Doctor", "Sex", "Reg Id","test" } ) { boolean[] canEdit = new boolean [] { false, false, false, false, false, false,false }; public boolean isCellEditable(int rowIndex, int columnIndex) { return canEdit [columnIndex]; } }); jScrollPane1.setViewportView(table); table.getColumnModel().getColumn(0).setResizable(false); table.getColumnModel().getColumn(1).setResizable(false); table.getColumnModel().getColumn(2).setResizable(false); table.getColumnModel().getColumn(3).setResizable(false); table.getColumnModel().getColumn(4).setResizable(false); table.getColumnModel().getColumn(5).setResizable(false); table.getColumnModel().getColumn(6).setResizable(false); jButton2.setText("Search"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt1) { try { jButton2ActionPerformed(evt1); } catch (ClassNotFoundException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } //catch block created } }); jLabel1.setText("Enter Reg. Id"); // The button Get Value and it prints the value of selected row getValue = new JButton("Get Value"); getValue.setToolTipText("Get values from table"); getValue.addActionListener(new ActionListener() { @SuppressWarnings("deprecation") public void actionPerformed(ActionEvent e) { Gid = (String) table.getValueAt(table.getSelectedRow(), 5); Gtest=(String) table.getValueAt(table.getSelectedRow(), 6); System.out.println(Gid); System.out.println(Gtest); //selected's code start here yo yoooo jScrollPane2 = new javax.swing.JScrollPane(); jTable2 = new javax.swing.JTable(); //storing the value of Registration id and test did from the ReportD table try { System.out.println("in selected"+Gid+Gtest); con=DbConnPa.getConObj(); con3=DbConnPa.getConObj(); Statement st = con.createStatement(); ResultSet rs = st.executeQuery("SELECT * FROM "+Gtest+""); ResultSetMetaData rsmd = rs.getMetaData(); NumOfCol = rsmd.getColumnCount(); //it stores the number of columns in NumOfCol // System.out.println("No. of columns in "+Gtest+"is"+NumOfCol); String o1="null"; String t1="\"Title"; String c1="\""; String c2=c1.concat(rsmd.getColumnName(1)+"\""); int m=1; for(m=1;m<NumOfCol;m++){ o1=o1.concat(",null"); t1=(t1+m).concat("\",\"Title"); }System.out.println(o1); System.out.println(t1+(m)+"\""); for(int n=2;n<=NumOfCol;n++) { //System.out.println("Name of ["+i+"] Column="+rsmd.getColumnName(i)); c2=c2.concat(","+"\""+rsmd.getColumnName(n)+"\""); }System.out.println(c2); jTable2.setModel(new javax.swing.table.DefaultTableModel( new Object [][] {{o1},}, new String [] {c2} )); // Object columns2[]={c2}; String sql3="SELECT COUNT (*) FROM "+Gtest+" where regid LIKE '"+Gid+"%'"; pr3=con3.prepareStatement(sql3); rs3=pr3.executeQuery(sql3); rs3.next(); int count = 0; // int col1=NumOfCol; count = rs3.getInt(1); System.out.println(count); data3= new Object [count][NumOfCol]; stmt3=con3.createStatement(); String sql4="SELECT * FROM "+Gtest+" where regid LIKE '"+Gid+"%'"; rs3=stmt3.executeQuery(sql4); k=0; while(rs3.next()){ for(int j=0;j<NumOfCol;j++){ data3[k][j]=rs3.getString(j+1); System.out.println("k:"+k+"j:"+j); } k++;} Object[] columns2={c2}; jScrollPane2.setSize(745, 134); jScrollPane2.setLocation(0, 570); jTable2.setColumnSelectionAllowed(true); jScrollPane2.setViewportView(jTable2); jTable2.getColumnModel().getSelectionModel().setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION); jTable2.setModel(new DefaultTableModel(data3, columns2)); jTable2.setVisible(true); } catch (ClassNotFoundException e1) { e1.printStackTrace(); } catch (SQLException e1) { e1.printStackTrace(); } } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); layout.setHorizontalGroup( layout.createParallelGroup(Alignment.TRAILING) .addGroup(layout.createSequentialGroup() .addContainerGap(69, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(Alignment.TRAILING) .addGroup(layout.createSequentialGroup() .addComponent(getValue) .addGap(431)) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(Alignment.LEADING) .addComponent(jButton1) .addGroup(layout.createParallelGroup(Alignment.TRAILING, false) .addGroup(layout.createSequentialGroup() .addGap(10) .addComponent(jLabel1, GroupLayout.PREFERRED_SIZE, 96, GroupLayout.PREFERRED_SIZE) .addPreferredGap(ComponentPlacement.RELATED) .addComponent(jTextField1) .addPreferredGap(ComponentPlacement.UNRELATED) .addComponent(jButton2)) .addComponent(jScrollPane1, GroupLayout.PREFERRED_SIZE, 536, GroupLayout.PREFERRED_SIZE))) .addGap(224)))) ); layout.setVerticalGroup( layout.createParallelGroup(Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(30) .addComponent(jButton1) .addPreferredGap(ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(Alignment.LEADING, false) .addGroup(layout.createParallelGroup(Alignment.BASELINE) .addComponent(jTextField1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE) .addComponent(jButton2)) .addGroup(layout.createSequentialGroup() .addComponent(jLabel1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addGap(5))) .addGap(2) .addComponent(jScrollPane1, GroupLayout.PREFERRED_SIZE, 184, GroupLayout.PREFERRED_SIZE) .addPreferredGap(ComponentPlacement.RELATED) .addComponent(getValue) .addContainerGap(371, Short.MAX_VALUE)) ); getContentPane().setLayout(layout); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) throws ClassNotFoundException, SQLException { con=DbConnPa.getConObj(); String sql="SELECT COUNT (*) FROM newpatient1"; pr=con.prepareStatement(sql); rs=pr.executeQuery(sql); rs.next(); int count = 0; count = rs.getInt(1); System.out.println(count); data= new Object [count][7]; stmt=con.createStatement(); String sql1="SELECT * FROM newpatient1"; rs1=stmt.executeQuery(sql1); while(rs1.next()){ for(int j=0;j<7;j++){ data[k][j]=rs1.getString(j+1); // System.out.println("i="+"j="+j); } k++;} table.setModel(new DefaultTableModel(data, columns)); table.setAutoCreateRowSorter(true); } public void jButton2ActionPerformed(java.awt.event.ActionEvent evt1) throws SQLException, ClassNotFoundException { String search=jTextField1.getText(); con2=DbConnPa.getConObj(); String sql="SELECT COUNT (*) FROM newpatient1 where regid LIKE '"+search+"%'"; pr=con2.prepareStatement(sql); rs=pr.executeQuery(sql); rs.next(); int count = 0; count = rs.getInt(1); System.out.println(count); data2= new Object [count][7]; stmt=con2.createStatement(); //String sql2="SELECT * FROM newpatient1 WHERE regid LIKE"+"'"+search+"%'"; String sql2="SELECT * FROM newpatient1 where regid LIKE '"+search+"%'"; System.out.println(search); stmt2=con2.createStatement(); rs2=stmt2.executeQuery(sql2); k=0; while(rs2.next()){ data2[k][0]=rs2.getString(1); data2[k][1]=rs2.getString(2); data2[k][2]=rs2.getString(3); data2[k][3]=rs2.getString(4); data2[k][4]=rs2.getString(5); data2[k][5]=rs2.getString(6); data2[k][6]=rs2.getString(7); String data=rs2.getString(2); // System.out.println(data+"k=="+k); k++;} table.setModel(new DefaultTableModel(data2, columns)); } /** * @param args the command line arguments */ 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(ReportD.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(ReportD.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(ReportD.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(ReportD.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 ReportD().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JLabel jLabel1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JScrollPane jScrollPane2; private javax.swing.JTextField jTextField1; private javax.swing.JTable table; private javax.swing.JTable jTable2; private JButton getValue; }

推荐答案

您正在将jScrollPane2的viewPort设置为jTable2，但是，您没有将jScrollPane2添加到JFrame本身.我认为，在actionPerformed中，对于getValue JButton，您应该这样写:

You are setting the viewPort of jScrollPane2 as jTable2 but, you are not adding jScrollPane2 to the JFrame itself. In my opinion, within actionPerformed for getValue JButton You should write:

jScrollPane1.setViewportView(jTable2);

代替

jScrollPane2.setViewportView(jTable2);

编辑 如果您不想替换jScrollPane1 viewPort，则只需将jScrollPane2添加到JFrame即可.它会在您的JFrame上显示jTable2.

EDIT In case you don't want to replace the jScrollPane1 viewPort then just add the jScrollPane2 to JFrame . It would show the jTable2 on your JFrame.