如何正确使用TableCellRenderer对单元格进行颜色匹配
我正在开发一个程序，该程序从文件中读取数据并将其放入jTable中。
根据数据，我计算出BMI。
知道我正在尝试实现TableCellRenderer来为BMI列中的单元格着色。 颜色红色-当BMI> 25时 颜色：黄色-当BMI <18
这是我的 Renderer ，它是Frame的内部类：
public class BMIRenderer extends JPanel implements TableCellRenderer {
public BMIRenderer() {
super.setOpaque(true);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
Person p = (Person) value;
if (p.getBMI() < 18) {
super.setBackground(Color.YELLOW);
} else if (p.getBMI() > 25) {
setBackground(Color.RED);
}
return this;
}
}
将渲染器添加到jTable：
mainTable.setDefaultRenderer(Person.class, new BMIRenderer());
没有任何反应，我正在尝试通过扩展DefaultTableCellRenderer尝试不同的方法，但是您可以猜测输出是相同的。我认为此代码的语法中缺少某些内容。
这是框架的代码：
public class Frame extends JFrame {
MyTableModel tableModel = new MyTableModel();
JTable mainTable = new JTable();
JPanel jPanel;
JScrollPane scrollPane = new JScrollPane(mainTable);
public Frame() throws ParseException, FileNotFoundException {
this.setSize(new Dimension(500, 150));
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
mainTable.setDefaultRenderer(Person.class, new BMIRenderer());
mainTable.setModel(tableModel);
scrollPane.setVisible(true);
jPanel = new JPanel(new BorderLayout());
jPanel.setBorder(BorderFactory.createLineBorder(Color.black));
jPanel.add(scrollPane, BorderLayout.CENTER);
// this.pack();
this.add(jPanel);
public class BMIRenderer extends JLabel implements TableCellRenderer {
public BMIRenderer() {
super.setOpaque(true);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
Person p = (Person) value;
if (p.getBMI() < 15) {
super.setBackground(Color.YELLOW);
} else if (p.getBMI() > 25) {
setBackground(Color.RED);
}
return this;
}
}
}
MyTableModel 类代码：
public class MyTableModel extends AbstractTableModel {
ArrayList<Person> dataList;
String imie, nazwisko; //name, surname
Color kolor;
Integer wzrostCm, wagaKg; //weight, height
Calendar cal;
Person p;
int BMI;
int r, g, b;
public MyTableModel() throws FileNotFoundException, ParseException {
dataList = new ArrayList<Person>();
Scanner read = new Scanner(new File("C:\\Users\\ziole\\EclipseWorkspace\\GUI_z07P_DOING\\src\\tabelka.txt"));
String pattern = "yyyy-MM-dd";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
System.out.println("Wczytany plik:");
while (read.hasNext()) {
cal = Calendar.getInstance();
String newLine = read.nextLine();
String[] elements = newLine.split(" ");
System.out.println(newLine);
imie = elements[0];
nazwisko = elements[1];
Date date = simpleDateFormat.parse(elements[2]);
cal.setTime(date);
String[] RGB = elements[3].split(",");
r = Integer.parseInt(RGB[0]);
g = Integer.parseInt(RGB[1]);
b = Integer.parseInt(RGB[2]);
kolor = new Color(r, g, b);
wzrostCm = new Integer(elements[4]);
wagaKg = new Integer(elements[5]);
BMI = bmi(wagaKg, wzrostCm);
dataList.add(new Person(imie, nazwisko, kolor, wzrostCm, wagaKg, cal, BMI));
}
}
@Override
public int getColumnCount() {
return 7;
}
@Override
public int getRowCount() {
return dataList.size();
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
p = dataList.get(rowIndex);
switch (columnIndex) {
case 0:
return p.imie;
case 1:
return p.nazwisko;
case 2:
return data(cal, p);
case 3:
return p.kolor.getRGB();
case 4:
return p.wzrostCm;
case 5:
return p.wagaKg;
case 6:
return p.BMI;
}
return null;
}
@Override
public String getColumnName(int column) {
switch (column) {
case 0:
return "Imie";
case 1:
return "Nazwisko";
case 2:
return "data";
case 3:
return "Kolor";
case 4:
return "Wzrost[cm]";
case 5:
return "Waga[kg]";
case 6:
return "BMI";
}
return null;
}
public String data(Calendar cal, Person p) {
// po Galicyjsku
switch (p.cal.get(cal.MONTH)) {
case 0:
return "xaneiro";
case 1:
return "febreiro";
case 2:
return "marzo";
case 3:
return "abril";
case 4:
return "maio";
case 5:
return "xuño";
case 6:
return "xullo";
case 7:
return "agosto";
case 8:
return "setembro";
case 9:
return "outubro";
case 10:
return "novembro";
case 11:
return "decembro";
default:
break;
}
return null;
}
public int bmi(Integer waga, Integer wzrostCm) {
double wzrostKwadrat = (int) Math.pow(wzrostCm, 2);
double wynik = Math.round(((waga / wzrostKwadrat) * 10000));
return (int) wynik;
}
}
和人员班级：
public class Person {
String imie, nazwisko;
Color kolor;
int r, g, b;
Integer wzrostCm, wagaKg;
Calendar cal;
int BMI;
public Person(String imie, String nazwisko, Color kolor, Integer wzrostCm, Integer wagaKg, Calendar cal, int BMI) {
this.imie = imie;
this.nazwisko = nazwisko;
this.kolor = kolor;
this.wzrostCm = wzrostCm;
this.wagaKg = wagaKg;
this.cal = cal;
this.BMI = BMI;
}
*here are simple getters and setters*
}
我从中读取的文件：
Jan Kowalski 1980-2-7 255,0,153 182 99
Michał Nowak 1988-8-13 0,0,153 177 73
Zofia Michalska 1971-6-12 255,0,51 162 53
Łukasz Gwózdz 1975-3-23 0,0,255 178 47
Tomasz Wójcik 1965-1-7 102,0,0 180 50
Beata Szczesniak 2000-8-28 51,102,0 160 70
Anna Pekala 1979-2-17 0,204,255 164 54
Robert Tarski 1971-11-2 255,102,0 176 70
在Main中，我只是创建框架的对象。
1 个答案:
答案 0 :(得分：2)
修改渲染器以扩展DefaultTableCellRenderer，重写getTableCellRendererComponent（）方法：
import javax.swing.table.DefaultTableCellRenderer;
public class BMIRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Person person = null;
String bmiValue = "";
if(value instanceof Person) {
person = (Person)value;
bmiValue = Integer.toString(person.getBMI());
}
//Pass just the bmiValue to the super method so the integer's toString() value is displayed
super.getTableCellRendererComponent(table, bmiValue, isSelected, hasFocus, row, column);
if(person != null) {
if (person.getBMI() < 18) {
super.setBackground(Color.YELLOW);
}
else if (person.getBMI() > 25) {
setBackground(Color.RED);
}
}
return this;
}
}
现在，修改表模型，使其返回第6列的整个Person对象，而不是BMI字段的int值：
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Person person = dataList.get(rowIndex);
switch (columnIndex) {
case 0:
return person.imie;
case 1:
return person.nazwisko;
case 2:
return data(cal, person);
case 3:
return person.kolor.getRGB();
case 4:
return person.wzrostCm;
case 5:
return person.wagaKg;
case 6:
//Return the entire Person object so that the column class matches to our custom cell renderer
return person;
}
return null;
}
在MyTableModel类中，如下重写getColumnClass（）方法：
@Override
public Class<?> getColumnClass(int columnIndex) {
switch (columnIndex) {
case 0:
return String.class;
case 1:
return String.class;
case 2:
return String.class;
case 3:
return Integer.class;
case 4:
return Integer.class;
case 5:
return Integer.class;
case 6:
return Person.class;
}
return Object.class;
}
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