Java JTable为所有单元格着色，而不仅仅是特定单元格_Java_Swing_Jtable_Background Color_Tablecellrenderer

Java JTable为所有单元格着色，而不仅仅是特定单元格

java swing

Java JTable为所有单元格着色，而不仅仅是特定单元格,java,swing,jtable,background-color,tablecellrenderer,Java,Swing,Jtable,Background Color,Tablecellrenderer,我有一个问题，一个方法应该改变一个特定单元格的颜色，但是所有单元格都会改变颜色这是我试图实现的方法： public Component cellBG(JTable table, int row, int column) { TableCellRenderer renderer = table.getCellRenderer(row, column); Component c = table.prepareRenderer(renderer, row, column);

我有一个问题，一个方法应该改变一个特定单元格的颜色，但是所有单元格都会改变颜色

这是我试图实现的方法：

public Component cellBG(JTable table, int row, int column)
{
    TableCellRenderer renderer = table.getCellRenderer(row, column);
    Component c = table.prepareRenderer(renderer, row, column);

    Object steak = table.getValueAt(row,column);

    if(((String) steak).startsWith("+"))
    {
       c.setBackground(Color.GREEN);
    }
    else if(((String) steak).startsWith("-"))
    {
        c.setBackground(Color.RED);
    }
    else if(((String) steak).startsWith("~"))
    {
        c.setBackground(Color.YELLOW);
    }
    else if(((String) steak).equals(""))
    {
        c.setBackground(Color.WHITE);
    }

    return c;

}

我的表格包含10列8行，所有行都包含+、-、~、或“”，这将导致不同颜色的分散图案，但表格在读取的最后一个entri中为实心

SSCCE中每个请求的Ass

import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Color;
import java.awt.Font;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JFrame;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;

public class ptf_viewer extends JFrame {

    static JTable table;
    static DefaultTableModel model;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ptf_viewer frame = new ptf_viewer();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }); 
    }

    public ptf_viewer(){
    getContentPane().setBackground(Color.WHITE);
    setTitle("Portable test file viewing");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(50, 50, 1024, 768);
    getContentPane().setLayout(null);

    final String[] columnNames = {"Test 1", "Test 2", "Test 3", "Test 4", "Test 5", "Test 6", "Test 7", "Test 8", "Test 9", "Test 10"};
    final Object[][] data = {
                {"+","+","","","","~","","","",""},
                {"-","+","","","","","","","",""},
                {"+","+","","","~","","","","",""},
                {"+","+","","","","","~","","",""},
                {"+","-","","~","","","","","",""},
                {"+","-","","","","","","","",""},
                {"+","-","","","","","","","",""},
                {"-","+","~","","","","","","","+"}
    };
    model = new DefaultTableModel(data, columnNames);
    table = new JTable(data, columnNames);
    table.setModel(model);
    for(int i = 0 ; i < 8 ; i++){
            cellBG(table, i, 9);
    }
    JTableHeader header = table.getTableHeader();
    header.setFont(new Font("Times New Roman", Font.BOLD, 13));
    header.setBackground(Color.black);
    header.setForeground(Color.white);

    JScrollPane scrollPane = new JScrollPane(table);
    scrollPane.setSize(988, 618);
    scrollPane.setFont(new Font("Times New Roman", Font.BOLD, 13));
    scrollPane.setLocation(10, 60);
    getContentPane().add(scrollPane);
    }
    public Component cellBG(JTable table, int row, int column)
    {
        TableCellRenderer renderer = table.getCellRenderer(row, column);
        Component c = table.prepareRenderer(renderer, row, column);

        Object bøf = table.getValueAt(row,column);

        if(((String) bøf).startsWith("+"))
        {
           c.setBackground(Color.GREEN);
        }
        else if(((String) bøf).startsWith("-"))
        {
            c.setBackground(Color.RED);
        }
        else if(((String) bøf).startsWith("~"))
        {
            c.setBackground(Color.YELLOW);
        }
        else if(((String) bøf).equals(""))
        {
            c.setBackground(Color.WHITE);
        }
        return c;
    }
    }

导入java.awt.Component；
导入java.awt.EventQueue；
导入java.awt.Color；
导入java.awt.Font；
导入javax.swing.JScrollPane；
导入javax.swing.JTable；
导入javax.swing.JFrame；
导入javax.swing.table.DefaultTableModel；
导入javax.swing.table.JTableHeader；
导入javax.swing.table.TableCellRenderer；
公共类ptf_查看器扩展JFrame{
静态JTable表；
静态模型；
公共静态void main（字符串[]args）{
invokeLater（新的Runnable（）{
公开募捐{
试一试{
ptf_查看器框架=新的ptf_查看器（）；
frame.setVisible（true）；
}捕获（例外e）{
e、 printStackTrace（）；
}
}
}); 
}
公共ptf_查看器（）{
getContentPane（）.setBackground（颜色为.WHITE）；
setTitle（“便携式测试文件查看”）；
setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
立根（50,501024768）；
getContentPane（）.setLayout（null）；
最终字符串[]列名={“测试1”、“测试2”、“测试3”、“测试4”、“测试5”、“测试6”、“测试7”、“测试8”、“测试9”、“测试10”}；
最终对象[][]数据={
{"+","+","","","","~","","","",""},
{"-","+","","","","","","","",""},
{"+","+","","","~","","","","",""},
{"+","+","","","","","~","","",""},
{"+","-","","~","","","","","",""},
{"+","-","","","","","","","",""},
{"+","-","","","","","","","",""},
{"-","+","~","","","","","","","+"}
};
模型=新的DefaultTableModel（数据、列名称）；
表=新的JTable（数据、列名称）；
表2.setModel（model）；
对于（int i=0；i<8；i++）{
cellBG（表一，9）；
}
JTableHeader=table.getTableHeader（）；
header.setFont（新字体（“Times new Roman”，Font.BOLD，13））；
标题.立根背景（颜色.黑色）；
标题。设置前景（颜色。白色）；
JScrollPane scrollPane=新的JScrollPane（表）；
滚动窗格。设置大小（988618）；
setFont（新字体（“Times new Roman”，Font.BOLD，13））；
滚动窗格。设置位置（10,60）；
getContentPane（）.add（滚动窗格）；
}
公共组件cellBG（JTable表、int行、int列）
{
TableCellRenderer=table.getCellRenderer（行、列）；
组件c=table.prepareRenderer（呈现器、行、列）；
Object bøf=table.getValueAt（行、列）；
if（（字符串）bøf）.startsWith（“+”）
{
c、 挫折背景（颜色：绿色）；
}
else if（（（字符串）bøf）.startsWith（“-”）
{
c、 挫折地面（颜色：红色）；
}
else if（（字符串）bøf）.startsWith（“~”）
{
c、 挫折地面（颜色：黄色）；
}
else if（（（字符串）bøf）.equals（“”）
{
c、 挫折地面（颜色：白色）；
}
返回c；
}
}

您需要创建自己的单元格渲染器，并让它根据单元格中包含的文本返回正确的背景色

public class MyTableCellRenderer extends DefaultTableCellRenderer {
    @Override
    public Color getBackground() {
        String steak = getText();
        if (steak.startsWith("+")) {
            return Color.GREEN;
        } else if (steak.startsWith("-")) {
            return Color.RED;
        } else if (steak.startsWith("~")) {
            return Color.YELLOW;
        } else if (steak.equals("")) {
            return Color.WHITE;
        }

            return super.getBackground();
        }
    }
}

确保你的桌子使用它

table.setDefaultRenderer(String.class, new MyTableCellRenderer());

这里假设所有单元格的类型都是

String

在SSCCE之后编辑：类是

Obejct

而不是

String

，请使用

table.setDefaultRenderer(Object.class, new MyTableCellRenderer());

您需要创建自己的单元格渲染器，并根据单元格中包含的文本使其返回正确的背景色

public class MyTableCellRenderer extends DefaultTableCellRenderer {
    @Override
    public Color getBackground() {
        String steak = getText();
        if (steak.startsWith("+")) {
            return Color.GREEN;
        } else if (steak.startsWith("-")) {
            return Color.RED;
        } else if (steak.startsWith("~")) {
            return Color.YELLOW;
        } else if (steak.equals("")) {
            return Color.WHITE;
        }

            return super.getBackground();
        }
    }
}

确保你的桌子使用它

table.setDefaultRenderer(String.class, new MyTableCellRenderer());

这里假设所有单元格的类型都是

String

在SSCCE之后编辑：类是

Obejct

而不是

String

，请使用

table.setDefaultRenderer(Object.class, new MyTableCellRenderer());

abbisDK写道，SSCE提出并补充了问题

使用
```
DefaultTableCellRenderer
```
和
```
Pattern.compile
```
查看（Strin.equals（）或String.startWith是另一种非常简单的方法）
同样，因此非常相似的代码可用于
```
prepareRenderer
```

源代码

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.util.regex.Pattern;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;

public class Ptf_Viewer {

    private JFrame frame = new JFrame("Portable test file viewing");
    private JTable table;
    private final String[] columnNames = {"Test 1", "Test 2", "Test 3", "Test 4",
        "Test 5", "Test 6", "Test 7", "Test 8", "Test 9", "Test 10"};
    private final Object[][] data = {
        {"+", "+", "", "", "", "~", "", "", "", ""},
        {"-", "+", "", "", "", "", "", "", "", ""},
        {"+", "+", "", "", "~", "", "", "", "", ""},
        {"+", "+", "", "", "", "", "~", "", "", ""},
        {"+", "-", "", "~", "", "", "", "", "", ""},
        {"+", "-", "", "", "", "", "", "", "", ""},
        {"+", "-", "", "", "", "", "", "", "", ""},
        {"-", "+", "~", "", "", "", "", "", "", "+"}
    };
    private DefaultTableModel model = new DefaultTableModel(data, columnNames);

    public Ptf_Viewer() {
        table = new JTable(data, columnNames) {
            //logics place for prepareRenderer
        };
        table.setModel(model);
        table.setPreferredScrollableViewportSize(
                new Dimension(800, table.getPreferredSize().height));
        JTableHeader header = table.getTableHeader();
        header.setFont(new Font("Times New Roman", Font.BOLD, 13));
        header.setBackground(Color.black);
        header.setForeground(Color.white);
        for (int i = 0; i < table.getColumnCount(); i++) {
            RowColorRenderer rowRenderer = new RowColorRenderer(i);
            TableColumn column = table.getColumnModel().getColumn(i);
            column.setCellRenderer(rowRenderer);
        }
        JScrollPane scrollPane = new JScrollPane(table);
        scrollPane.setFont(new Font("Times New Roman", Font.BOLD, 13));
        frame.add(scrollPane);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(50, 50);
        frame.pack();
        frame.setVisible(true);
    }

    private class RowColorRenderer extends DefaultTableCellRenderer {

        private static final long serialVersionUID = 1L;
        private int colNo = 0;

        RowColorRenderer(int col) {
            colNo = col;
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
            Component comp = super.getTableCellRendererComponent(table, value,
                    isSelected, hasFocus, row, column);
            JComponent jc = (JComponent) comp;
            if (!isSelected) {
                if (table.getValueAt(row, colNo) != null) {
                    String str = table.getValueAt(row, colNo).toString();
                    if (!str.isEmpty()) {
                        if ((Pattern.compile("[+]").matcher(str).find())) {
                            setForeground(Color.magenta);
                            setBackground(Color.GREEN);
                            setFont(new Font("Serif", Font.BOLD, 16));
                            setHorizontalAlignment(CENTER);
                        } else if ((Pattern.compile("[-]").matcher(str).find())) {
                            setForeground(Color.blue);
                            setBackground(Color.RED);
                            setFont(new Font("Serif", Font.BOLD, 16));
                            setHorizontalAlignment(CENTER);
                        } else if ((Pattern.compile("[~]").matcher(str).find())) {
                            setForeground(Color.red);
                            setBackground(Color.YELLOW);
                            setFont(new Font("Serif", Font.BOLD, 16));
                            setHorizontalAlignment(CENTER);
                        } else {
                            setBackground(Color.WHITE);
                            setForeground(table.getForeground());
                            setFont(new Font("Serif", Font.PLAIN, 12));
                            setHorizontalAlignment(CENTER);
                        }
                    } else {
                        setBackground(Color.WHITE);
                        setForeground(table.getForeground());
                    }
                }
            }
            return this;
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                Ptf_Viewer frame = new Ptf_Viewer();
            }
        });
    }
}

导入java.awt.Color；
导入java.awt.Component；
导入java.awt.Dimension；
导入java.awt.EventQueue；
导入java.awt.Font；
导入java.util.regex.Pattern；
导入javax.swing.JComponent；
导入javax.swing.JFrame；
导入javax.swing.JScrollPane；
导入javax.swing.JTable；
导入javax.swing.table.DefaultTableCellRenderer；
导入javax.swing.table.DefaultTableModel；
导入javax.swing.table.JTableHeader；
导入javax.swing.table.TableColumn；
公共类Ptf_查看器{
私有JFrame=新JFrame（“便携式测试文件查看”）；
专用JTable表；
私有最终字符串[]columnNames={“测试1”、“测试2”、“测试3”、“测试4”，
“测试5”、“测试6”、“测试7”、“测试8”、“测试9”、“测试10”}；
私有最终对象[][]数据={
{"+", "+", "", "", "", "~", "", "", "", ""},
{"-", "+", "", "", "", "", "", "", "", ""},
{"+", "+", "", "", "~", "", "", "", "", ""},
{"+", "+", "", "", "", "", "~", "", "", ""},
{"+", "-", "", "~", "", "", "", "", "", ""},
{"+", "-", "", "", "", "", "", "", "", ""},
{"+", "-", "", "", "", "", "", "", "", ""},
{"-", "+", "~", "", "", "", "", "", "", "+"}
};
private DefaultTableModel=new DefaultTableModel（数据、列名）；
公共Ptf_查看器（）{
表=新的JTable（数据、列名称）{
//准备者的逻辑位置
};
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