我有一个要求，根据HashMap<String, String>的内容，我要在我的表中添加/删除列。虽然我能够添加/删除列，但我的问题是，由于某种原因，当我创建新列时，值不会在相应的列中设置。我无法弄清楚原因。
发布SSCCE供您参考。你能告诉我我做错了什么吗？
import java.util.HashMap;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class TableTest extends javax.swing.JFrame {
/**
* Creates new form TableTest
*/
public TableTest() {
initComponents();
}
private void resetTable(){
TableColumnModel tableColumnModel = infoTable.getColumnModel();
DefaultTableModel tableModel = (DefaultTableModel) infoTable.getModel();
JTableHeader tableHeader = infoTable.getTableHeader();
tableColumnModel.getColumn(0).setHeaderValue("");
for(int columnIndex = 0; columnIndex < tableColumnModel.getColumnCount(); columnIndex++){
if(columnIndex > 3){
infoTable.removeColumn(tableColumnModel.getColumn(columnIndex));
}else{
tableModel.setValueAt("", 0, columnIndex);
tableModel.setValueAt("", 1, columnIndex);
}
}
tableHeader.repaint();
infoTable.revalidate();
infoTable.repaint();
}
private void createTable(HashMap<String, String> parameterMap){
resetTable();
TableColumnModel tableColumnModel = infoTable.getColumnModel();
DefaultTableModel tableModel = (DefaultTableModel) infoTable.getModel();
if(!parameterMap.isEmpty()){
int columnCount = 1;
for (String key : parameterMap.keySet()) {
if(columnCount >= tableColumnModel.getColumnCount()){
tableModel.addColumn("");
tableColumnModel.addColumn(new TableColumn());
}
columnCount++;
}
}
infoTable.revalidate();
infoTable.repaint();
}
private void updateInformationTable(HashMap<String, String> parameterMap){
createTable(parameterMap);
TableColumnModel tableColumnModel = infoTable.getColumnModel();
DefaultTableModel tableModel = (DefaultTableModel) infoTable.getModel();
JTableHeader tableHeader = infoTable.getTableHeader();
if(!parameterMap.isEmpty()){
tableColumnModel.getColumn(0).setHeaderValue(parameterMap.get("timer"));
int columnCount = 1;
for (String key : parameterMap.keySet()) {
tableModel.setValueAt((key.contains("unknown") ? "" : key), 0, columnCount);
tableModel.setValueAt(parameterMap.get(key), 1, columnCount);
columnCount++;
}
}
tableHeader.repaint();
infoTable.revalidate();
infoTable.repaint();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
infoTable = new javax.swing.JTable();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
infoTable.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
},
new String [] {
"Title 1", "", "", ""
}
));
infoTable.setAutoscrolls(false);
infoTable.setShowHorizontalLines(false);
infoTable.setShowVerticalLines(false);
infoTable.setAutoCreateColumnsFromModel(false);
jScrollPane1.setViewportView(infoTable);
jButton1.setText("3 Columns");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("5 Columns");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 577, Short.MAX_VALUE)
.addComponent(jButton2))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 739, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(243, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap())
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 234, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 25, Short.MAX_VALUE)))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("param1", "value1");
map.put("param2", "value2");
map.put("param3", "value3");
updateInformationTable(map);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("param1", "value1");
map.put("param2", "value2");
map.put("param3", "value3");
map.put("param4", "value4");
map.put("param5", "value5");
updateInformationTable(map);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel" /*
* UIManager.getSystemLookAndFeelClassName()
*/);
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(TableTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TableTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TableTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TableTest.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 TableTest().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTable infoTable;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}
答案 0 :(得分：1)
这是更新表的很多代码。尝试更新模型。表将重新呈现自己。我不得不再换一行：
infoTable.setAutoCreateColumnsFromModel（真）;
而且，Hashmap不适合模型数据。如何从HashMap中的第3行第2列轻松获取值？
import java.util.HashMap;
import java.util.Map;
import javax.swing.table.DefaultTableModel;
public class TableTest extends javax.swing.JFrame {
/**
* Creates new form TableTest
*/
public TableTest() {
initComponents();
}
private void updateInformationTable(HashMap<String, String> parameterMap){
infoTable.setModel(new MyTableModel(parameterMap));
}
private class MyTableModel extends DefaultTableModel{
private Map<String, String> data;
public MyTableModel(Map<String, String> data){
this.data = data;
}
public int getRowCount() {
return 1;
}
public int getColumnCount() {
return data != null ? data.size() : 0;
}
public Object getValueAt(int rowIndex, int columnIndex) {
//FIXME : Return the value here
return rowIndex + "," + columnIndex;
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
infoTable = new javax.swing.JTable();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
infoTable.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
},
new String [] {
"Title 1", "", "", ""
}
));
infoTable.setAutoscrolls(false);
infoTable.setShowHorizontalLines(false);
infoTable.setShowVerticalLines(false);
infoTable.setAutoCreateColumnsFromModel(true);
jScrollPane1.setViewportView(infoTable);
jButton1.setText("3 Columns");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("5 Columns");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 577, Short.MAX_VALUE)
.addComponent(jButton2))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 739, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(243, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap())
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 234, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 25, Short.MAX_VALUE)))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("param1", "value1");
map.put("param2", "value2");
map.put("param3", "value3");
updateInformationTable(map);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("param1", "value1");
map.put("param2", "value2");
map.put("param3", "value3");
map.put("param4", "value4");
map.put("param5", "value5");
updateInformationTable(map);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel" /*
* UIManager.getSystemLookAndFeelClassName()
*/);
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(TableTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TableTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TableTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TableTest.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 TableTest().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTable infoTable;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}