如何在java中添加、删除和更新GlazedList/JTable中的行?
我创建了一个带有GlazedList的表,以便能够为搜索目的过滤该表。现在的问题是如何删除、添加或更新此表中的行。我确实搜索了API,但没有找到它 有人能用一个简单的例子演示如何实现删除、添加和更新吗?如何在java中添加、删除和更新GlazedList/JTable中的行?,java,swing,jtable,jtextfield,glazedlists,Java,Swing,Jtable,Jtextfield,Glazedlists,我创建了一个带有GlazedList的表,以便能够为搜索目的过滤该表。现在的问题是如何删除、添加或更新此表中的行。我确实搜索了API,但没有找到它 有人能用一个简单的例子演示如何实现删除、添加和更新吗? public static JTable retrieveArtikelTable(String filePath, String[] header, JTextField filterField) { EventList eventList = new BasicEventList()
public static JTable retrieveArtikelTable(String filePath, String[] header, JTextField filterField) {
EventList eventList = new BasicEventList();
String[] headers = new String[0];
CsvReader reader = null;
JTable t = new JTable();
if (filePath != null) {
if (new File(filePath).exists()) {
try {
reader = new CsvReader(filePath, ';');
if (header != null) {
headers = header;
} else {
headers = reader.getHeaders();
}
while (reader.readRecord()) {
String[] values = reader.getValues();
eventList.add(new Artikel(values[0], values[1], values[2]));
}
reader.close();
TextFilterator artikelFilterator = new TextFilterator() {
public void getFilterStrings(List baseList, Object element) {
Artikel artikel = (Artikel) element;
baseList.add(artikel.getCode());
baseList.add(artikel.getName());
baseList.add(artikel.getNumber());
}
};
TextComponentMatcherEditor matcherEditor = new TextComponentMatcherEditor(filterField, artikelFilterator);
FilterList filteredArtikels = new FilterList(eventList, new ThreadedMatcherEditor(matcherEditor));
// build a JTable
TableFormat tf = GlazedLists.tableFormat(Artikel.class,headers, headers);
t = new JTable(new EventTableModel(filteredArtikels, tf));
} catch (Exception ex) {
OeExceptionDialog.show(ex);
} finally {
assert reader != null;
reader.close();
}
}
}else{
t=new JTable();
JOptionPane.showMessageDialog(filterField.getParent(),"Attention: " +filePath+
"There is no such a file to be able to create a table!");
}
return t;
}
header = new String[]{"Code","Name","Number"};
JTextField filterField = new JTextField();
JTable table = retrieveArtikelTable("c:\articl.csv", header, filterField)
int selectedRow = table.getSelectedRow();
EventTableModel tableModel = (EventTableModel) table.getModel();
// code for deleting a row from this table
// code for add row to this table
// code for updating row from this table
编辑:
EventList eventList = new BasicEventList();
JTable table = retrieveArtikelTable("c:\articl.csv", header, filterField, eventList)
int selectedRow = table.getSelectedRow();
// code for deleting a row from this table
eventList.remove(selectedRow);
// code for add row to this table
// code for updating row from this table
如果对事件列表进行更改,那么这些更改将通过表模型传播到JTable。(也就是说,如果向该列表中添加新对象、删除新对象或更新新对象,则会自动进行更改。因此,“事件”前缀-列表中的事件会传递给模型。) 因此,您可能需要保留一个对事件列表的引用,以确保在您的情况下,
retrieveArtikelTable()
之外的部分代码可以访问事件列表
我觉得上一期的视频非常适合涵盖所有重要的主题
编辑:提醒您如何使列表成为实例变量,以便可以通过任何方法访问它,而不仅仅是通过构造表的方法
public class Example {
private EventList<Person> eventList = new BasicEventList<Person>();
public JTable createTable(...) { ... code to generate the table ...}
public void manipulateTable() {
// add to the table (via the eventList)
eventList.add(new Person("Steve Jobs"));
// remove first object in the table (and the list)
eventList.remove(0);
// update a row
Person p = eventList.get(0);
p.setName("A N Other");
eventList.set(0,p); // overwrite the old object in the list
}
}
在我的示例中,我使用了一个Person类,它非常简单:
我个人建议将数据加载与创建表的方法分开。我使用了填充列表的
loadData()
方法。如果没有要加载的数据,或者从中加载的文件有问题,则仍然会创建表,但表中没有任何内容,因为列表仍然为空。我可以通过以下方式或任何其他方式从表中获取事件列表:''eventList list=(eventList)table.getEventList`不直接获取。充其量,您必须扩展EventTableModel,并创建一个新方法,以向公众提供对其源字段(Eventlist)的访问。然后可以得到表的模型及其源。但是,将事件列表放在其他位置(例如父类的实例变量)要容易得多,而不是在创建JTable的方法中声明它,事实上,第二个解决方案更简单。我让它工作了。部分工作了,但不是全部工作。当我搜索表并找到一行,选择它,然后删除它时,它会留在那里,但如果不搜索并选择一行,然后删除它,则删除成功。我怀疑您没有使用正确的方法来检测所选行。请参阅我编辑的答案,了解完整的工作示例应用程序。
public class MyFrame extends javax.swing.JFrame {
private EventList<Person> eventList = new BasicEventList<Person>();
private EventSelectionModel<Person> selectionModel;
/**
* Creates new form MyFrame
*/
public MyFrame() {
initComponents();
loadData();
configureTable();
}
private void loadData() {
eventList.add(new Person("Richard", "Dawkins"));
eventList.add(new Person("Sam", "Harris"));
eventList.add(new Person("Christopher", "Hitchens"));
eventList.add(new Person("Daniel", "Dennett"));
}
private void configureTable() {
String[] headers = new String[]{"Firstname", "Lastname"};
String[] properties = new String[]{"firstname", "lastname"};
TextFilterator<Person> personTextFilterator = new TextFilterator<Person>() {
@Override
public void getFilterStrings(List list, Person p) {
list.add(p.getFirstname());
list.add(p.getLastname());
}
};
MatcherEditor<Person> textMatcherEditor = new TextComponentMatcherEditor<Person>(txtFilter, personTextFilterator);
FilterList<Person> filterList = new FilterList<Person>(eventList, textMatcherEditor);
TableFormat tf = GlazedLists.tableFormat(properties, headers);
EventTableModel<Person> model = new EventTableModel<Person>(filterList, tf);
selectionModel = new EventSelectionModel<Person>(filterList);
tblNames.setSelectionModel(selectionModel);
tblNames.setModel(model);
}
/**
* 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() {
jLabel1 = new javax.swing.JLabel();
txtFilter = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
tblNames = new javax.swing.JTable();
btnDelete = new javax.swing.JButton();
btnReload = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("GlazedLists test");
jLabel1.setText("Filter");
tblNames.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane1.setViewportView(tblNames);
btnDelete.setText("Delete");
btnDelete.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnDeleteActionPerformed(evt);
}
});
btnReload.setText("Reload data");
btnReload.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnReloadActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(jLabel1)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(txtFilter))
.add(jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 388, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
.add(btnReload)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(btnDelete)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(jLabel1)
.add(txtFilter, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
.add(jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 240, Short.MAX_VALUE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(btnDelete)
.add(btnReload))
.addContainerGap())
);
pack();
}// </editor-fold>
private void btnDeleteActionPerformed(java.awt.event.ActionEvent evt) {
if (!selectionModel.isSelectionEmpty()) {
eventList.removeAll(selectionModel.getSelected());
}
}
private void btnReloadActionPerformed(java.awt.event.ActionEvent evt) {
eventList.clear();
loadData();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new MyFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btnDelete;
private javax.swing.JButton btnReload;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable tblNames;
private javax.swing.JTextField txtFilter;
// End of variables declaration
}
public class Person {
private String firstname;
private String lastname;
public Person() {
}
public Person(String firstname, String lastname) {
this.firstname = firstname;
this.lastname = lastname;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
}