问题：
为什么JTable数据在编辑后不会改变？
陈松
我可以从数据库中获取数据并将其存储在JTable中。所有工作都很好，但是如果我从表中编辑数据并按enter键，数据就不会编辑。
值更改后不会在表中重写。
构造函数和getter/setter
public class employee {
private Integer emp_code;
private String f_name;
private String l_name;
private Integer age;
private String birth;
private String nationality;
private String gender;
private String contact;
private String contact2;
private String address;
private Integer gov_id;
private String passport_no;
private String profile;
public employee(Integer emp_code, String f_name, String l_name, Integer age, String birth, String nationality, String gender, String contact, String contact2, String address, Integer gov_id, String passport_no, String profile) {
this.emp_code = emp_code;
this.f_name = f_name;
this.l_name = l_name;
this.age = age;
this.birth = birth;
this.nationality = nationality;
this.gender = gender;
this.contact = contact;
this.contact2 = contact2;
this.address = address;
this.gov_id = gov_id;
this.passport_no = passport_no;
this.profile = profile;
}
// getter setter
}
public class TheModel extends AbstractTableModel {
private String[] columns;
private Object[][] rows;
private boolean[] edit;
public TheModel() {
}
public TheModel(Object[][] data, String[] columnName, boolean[] canEdit) {
this.rows = data;
this.columns = columnName;
this.edit = canEdit;
}
public Class getColumnClass(int column) {
if (column == 12) {
return Icon.class;
} else {
return getValueAt(0, column).getClass();
}
}
public int getRowCount() {
return this.rows.length;
}
public int getColumnCount() {
return this.columns.length;
}
public Object getValueAt(int rowIndex, int columnIndex) {
return this.rows[rowIndex][columnIndex];
}
public String getColumnName(int col) {
return this.columns[col];
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
return edit[columnIndex];
}
}
private void btnSearchActionPerformed(java.awt.event.ActionEvent evt) {
getEmployee();
}
public void getEmployee() {
ArrayList<employee> list = getTable();
String[] columnName = {"Code", "f_name", "l_name", "Age", "Birth", "Nationality", "Gender", "Contact", "Contact2", "Address", "Gov. id", "Passport no", "Profile"};
boolean[] canEdit = new boolean[]{
false, false, false, false, false, false, false, false, false, false, false, false, false
};
Object[][] rows = new Object[list.size()][13];
for (int i = 0; i < list.size(); i++) {
rows[i][0] = list.get(i).getEmp_code();
rows[i][1] = list.get(i).getF_name();
rows[i][2] = list.get(i).getL_name();
rows[i][3] = list.get(i).getAge();
rows[i][4] = list.get(i).getBirth();
rows[i][5] = list.get(i).getNationality();
rows[i][6] = list.get(i).getGender();
rows[i][7] = list.get(i).getContact();
rows[i][8] = list.get(i).getContact2();
rows[i][9] = list.get(i).getAddress();
rows[i][10] = list.get(i).getGov_id();
rows[i][11] = list.get(i).getPassport_no();
if (list.get(i).getProfile() != "") {
ImageIcon MyImage = new ImageIcon(new ImageIcon(list.get(i).getProfile()).getImage()
.getScaledInstance(70, 50, Image.SCALE_SMOOTH));
rows[i][12] = MyImage;
} else {
rows[i][12] = null;
}
}
TheModel model = new TheModel(rows, columnName, canEdit);
model.fireTableDataChanged();
jTable1.setModel(model);
jTable1.setRowHeight(50);
jTable1.getColumnModel().getColumn(12).setPreferredWidth(70);
}
public ArrayList<employee> getTable() {
ArrayList<employee> list = new ArrayList<employee>();
PreparedStatement pst;
ResultSet r;
try {
Connection cn = null;
Class.forName("com.mysql.jdbc.Driver");
cn = DriverManager.getConnection("jdbc:mysql://localhost/car_inventory_system", "root", "");
pst = cn.prepareStatement("SELECT * FROM employee_registration_master WHERE f_name = ? OR l_name = ?");
pst.setString(1, txtSearch.getText());
pst.setString(2, txtSearch.getText());
r = pst.executeQuery();
employee e;
while (r.next()) {
e = new employee(
r.getInt("emp_code"),
r.getString("f_name"),
r.getString("l_name"),
r.getInt("age"),
r.getString("birth"),
r.getString("nationality"),
r.getString("gender"),
r.getString("contact"),
r.getString("contact2"),
r.getString("address"),
r.getInt("gov_id"),
r.getString("passport_no"),
r.getString("profile")
);
list.add(e);
}
pst.close();
cn.close();
} catch (Exception e) {
System.out.println(e);
}
return list;
}
private void btnSearchActionPerformed(java.awt.event.ActionEvent evt) {
//populateJTable();
PreparedStatement pst;
ResultSet r;
try {
Connection cn = null;
Class.forName("com.mysql.jdbc.Driver");
cn = DriverManager.getConnection("jdbc:mysql://localhost/car_inventory_system", "root", "");
pst = cn.prepareStatement("SELECT * FROM employee_registration_master WHERE f_name = ? OR l_name = ?");
pst.setString(1, txtSearch.getText());
pst.setString(2, txtSearch.getText());
r = pst.executeQuery();
employee e;
int i = 0;
JLabel imageLabel = new JLabel();
while (r.next()) {
jTable1.setValueAt(r.getInt("emp_code"), i, 0);
jTable1.setValueAt(r.getString("f_name"), i, 1);
jTable1.setValueAt(r.getString("l_name"), i, 2);
jTable1.setValueAt(r.getInt("age"), i, 3);
jTable1.setValueAt(r.getString("birth"), i, 4);
jTable1.setValueAt(r.getString("nationality"), i, 5);
jTable1.setValueAt(r.getString("gender"), i, 6);
jTable1.setValueAt(r.getString("contact"), i, 7);
jTable1.setValueAt(r.getString("contact2"), i, 8);
jTable1.setValueAt(r.getString("address"), i, 9);
jTable1.setValueAt(r.getInt("gov_id"), i, 10);
jTable1.setValueAt(r.getString("passport_no"), i, 11);
if (r.getString("profile") != null) {
ImageIcon MyImage = new ImageIcon(r.getString("profile"));
Image img = MyImage.getImage();
Image newImg = img.getScaledInstance(70, 5, Image.SCALE_SMOOTH);
ImageIcon image = new ImageIcon(newImg);
jTable1.setValueAt(imageLabel.setIcon(image), i, 12); // Error: 'void' type not allowed here
}
i++;
}
pst.close();
cn.close();
} catch (Exception e) {
System.out.println(e);
}
}
共有1个答案
温源
简单地说，您需要重写tablemodel的setvalueat。当单元格“停止”编辑时，它会通知JTable，JTable获取单元格值并调用TableModel的setValueat方法。然后，您需要根据模型的需求更新模型，并生成一个合适的修改事件。
例如...
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
List<Employee> employees = new ArrayList<>(25);
employees.add(new Employee(1, "Jack", "Dourcy", 28, "03-11-2000", "American", "Male", "No of your business", "Stop spamming me", "Some place, some where", 45, "123456789", "Smiley"));
JTable table = new JTable();
TheModel model = new TheModel(employees);
table.setModel(model);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class Employee {
private Integer emp_code;
private String f_name;
private String l_name;
private Integer age;
private String birth;
private String nationality;
private String gender;
private String contact;
private String contact2;
private String address;
private Integer gov_id;
private String passport_no;
private String profile;
public Employee(Integer emp_code, String f_name, String l_name, Integer age, String birth, String nationality, String gender, String contact, String contact2, String address, Integer gov_id, String passport_no, String profile) {
this.emp_code = emp_code;
this.f_name = f_name;
this.l_name = l_name;
this.age = age;
this.birth = birth;
this.nationality = nationality;
this.gender = gender;
this.contact = contact;
this.contact2 = contact2;
this.address = address;
this.gov_id = gov_id;
this.passport_no = passport_no;
this.profile = profile;
}
public Integer getEmp_code() {
return emp_code;
}
public void setEmp_code(Integer emp_code) {
this.emp_code = emp_code;
}
public String getF_name() {
return f_name;
}
public void setF_name(String f_name) {
this.f_name = f_name;
}
public String getL_name() {
return l_name;
}
public void setL_name(String l_name) {
this.l_name = l_name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getBirth() {
return birth;
}
public void setBirth(String birth) {
this.birth = birth;
}
public String getNationality() {
return nationality;
}
public void setNationality(String nationality) {
this.nationality = nationality;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getContact() {
return contact;
}
public void setContact(String contact) {
this.contact = contact;
}
public String getContact2() {
return contact2;
}
public void setContact2(String contact2) {
this.contact2 = contact2;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Integer getGov_id() {
return gov_id;
}
public void setGov_id(Integer gov_id) {
this.gov_id = gov_id;
}
public String getPassport_no() {
return passport_no;
}
public void setPassport_no(String passport_no) {
this.passport_no = passport_no;
}
public String getProfile() {
return profile;
}
public void setProfile(String profile) {
this.profile = profile;
}
}
public class TheModel extends AbstractTableModel {
private List<Employee> employees;
private String[] columns = new String[] {
"Code", "First name", "Last name", "Age", "Birth date", "Nationality",
"Gender", "Contact", "Contact", "Address", "Gov. Id", "Pass", "Profile"
};
public TheModel(List<Employee> employees) {
this.employees = employees;
}
public Class getColumnClass(int column) {
switch (column) {
case 0:
case 3:
case 10: return Integer.class;
default: return String.class;
}
}
public int getRowCount() {
return employees.size();
}
public int getColumnCount() {
return columns.length;
}
public String getColumnName(int col) {
return this.columns[col];
}
public Object getValueAt(int rowIndex, int columnIndex) {
Employee employee = employees.get(rowIndex);
switch (columnIndex) {
case 0: return employee.getEmp_code();
case 1: return employee.getF_name();
case 2: return employee.getL_name();
case 3: return employee.getAge();
case 4: return employee.getBirth();
case 5: return employee.getNationality();
case 6: return employee.getGender();
case 7: return employee.getContact();
case 8: return employee.getContact2();
case 9: return employee.getAddress();
case 10: return employee.getGov_id();
case 11: return employee.getPassport_no();
case 12: return employee.getProfile();
}
return null;
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
switch (columnIndex) {
case 1:
case 2: return true;
default: return false;
}
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
Employee employee = employees.get(rowIndex);
switch (columnIndex) {
case 1:
if (aValue instanceof String) {
String newValue = (String)aValue;
employee.setF_name(newValue);
}
case 2:
if (aValue instanceof String) {
String newValue = (String)aValue;
employee.setL_name(newValue);
}
}
fireTableCellUpdated(rowIndex, columnIndex);
}
}
}
请注意，我已经更新了模型，以便直接利用员工POJO，而不是利用数组和其他东西。
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