JAVA 控制台字体颜色设置

package org.swan.accessories;

public class ConsoleConstant {
    // Reset
    private static final String RESET = "33[0m";  // Text Reset
    private static final int COLOR_OFFSET = 16;
    private static final int COLOR_MASK = (1 << 8) - 1;
    private static final int FONT_STYLE_OFFSET = 4;
    private static final int FONT_STYLE_MASK = (1 << 4) - 1;
    private static final int STYLE_OFFSET = 0;
    private static final int STYLE_MASK = (1 << 4) - 1;

    public static final int SGR_FONT_STYLE_NORMAL = 0 << STYLE_OFFSET;
    public static final int SGR_FONT_STYLE_BOLD = 1 << STYLE_OFFSET;
    public static final int SGR_FONT_STYLE_FAINT = 2 << STYLE_OFFSET;
    public static final int SGR_FONT_STYLE_ITALIC = 3 << STYLE_OFFSET;
    public static final int SGR_FONT_STYLE_UNDER_LINE = 4 << STYLE_OFFSET;
    public static final int SGR_FONT_STYLE_DOUBLE_UNDER_LINE = 21 << STYLE_OFFSET;

    public static final int BACKGROUND = 1 << FONT_STYLE_OFFSET + 4;

    public static final int FONT_COLOR_STYLE_NORMAL = 3 << FONT_STYLE_OFFSET;
    public static final int FONT_COLOR_STYLE_BRIGHT = 9 << FONT_STYLE_OFFSET;

    // Regular Colors
    public static final int BLACK = 0 << COLOR_OFFSET;   // BLACK
    public static final int RED = 1 << COLOR_OFFSET;     // RED
    public static final int GREEN = 2 << COLOR_OFFSET;   // GREEN
    public static final int YELLOW = 3 << COLOR_OFFSET;  // YELLOW
    public static final int BLUE = 4 << COLOR_OFFSET;    // BLUE
    public static final int PURPLE = 5 << COLOR_OFFSET;  // PURPLE
    public static final int CYAN = 6 << COLOR_OFFSET;    // CYAN
    public static final int WHITE = 7 << COLOR_OFFSET;   // WHITE

    public static final ConsoleConstant STYLE_BLACK = newInstance(BLACK);
    public static final ConsoleConstant STYLE_WHITE = newInstance(WHITE);
    public static final ConsoleConstant STYLE_RED = newInstance(RED);
    public static final ConsoleConstant STYLE_RESET = newInstance(0);
    private final int style;

    public static ConsoleConstant newInstance(int style) {
        return new ConsoleConstant(style);
    }

    public ConsoleConstant setColor(int color) {
        return newInstance(appendAttribute(color, COLOR_OFFSET, COLOR_MASK));
    }

    public ConsoleConstant setStyle(int style) {
        return newInstance(appendAttribute(style, STYLE_OFFSET, STYLE_MASK));
    }

    public ConsoleConstant setBackground(boolean isBackground) {
        return newInstance(isBackground ? (this.style | BACKGROUND) : (this.style & ~BACKGROUND));
    }

    public ConsoleConstant setColorStyle(int color) {
        return newInstance(appendAttribute(color, FONT_STYLE_OFFSET, FONT_STYLE_MASK));
    }

    private int appendAttribute(int color, int offset, int mask) {
        int newColor = color & (mask << offset);
        return (this.style & ~(mask << offset)) | newColor;
    }

    private ConsoleConstant(int style) {
        this.style = style;
    }

    @Override
    public String toString() {
        return getEscString(this.style);
    }

    private static String getEscString(int style) {
        if (style == 0) return RESET;
        StringBuilder sb = new StringBuilder();
        sb.append("33[");
        sb.append(getSGR(style)).append(getColor(style));
        sb.append("m");
        return sb.toString();
    }

    private static String getSGR(int style) {
        if ((style & BACKGROUND) != 0)
            return "";
        return (style & 0xFF) + ";";
    }

    private static String getColor(final int style) {
        int color = style >> COLOR_OFFSET & COLOR_MASK;
        int colorStyle = (style >> FONT_STYLE_OFFSET) & FONT_STYLE_MASK;
        colorStyle = colorStyle == 0 ? FONT_COLOR_STYLE_NORMAL >> FONT_STYLE_OFFSET : colorStyle;
        if ((style & BACKGROUND) != 0) colorStyle++;
        return "" + colorStyle + color;
    }

}