java后台如何将rgb与16进制颜色进行转换

首先将rgb颜色转换成16进制

//**将rgb色彩值转成16进制代码**
    public  String convertRGBToHex(int r, int g, int b) {
        String rFString, rSString, gFString, gSString,  
        bFString, bSString, result;
        int red, green, blue;
        int rred, rgreen, rblue;
        red = r / 16;
        rred = r % 16;
        if (red == 10) rFString = "A";
        else if (red == 11) rFString = "B";
        else if (red == 12) rFString = "C";
        else if (red == 13) rFString = "D";
        else if (red == 14) rFString = "E";
        else if (red == 15) rFString = "F";
        else rFString = String.valueOf(red);

        if (rred == 10) rSString = "A";
        else if (rred == 11) rSString = "B";
        else if (rred == 12) rSString = "C";
        else if (rred == 13) rSString = "D";
        else if (rred == 14) rSString = "E";
        else if (rred == 15) rSString = "F";
        else rSString = String.valueOf(rred);

        rFString = rFString + rSString;

        green = g / 16;
        rgreen = g % 16;

        if (green == 10) gFString = "A";
        else if (green == 11) gFString = "B";
        else if (green == 12) gFString = "C";
        else if (green == 13) gFString = "D";
        else if (green == 14) gFString = "E";
        else if (green == 15) gFString = "F";
        else gFString = String.valueOf(green);

        if (rgreen == 10) gSString = "A";
        else if (rgreen == 11) gSString = "B";
        else if (rgreen == 12) gSString = "C";
        else if (rgreen == 13) gSString = "D";
        else if (rgreen == 14) gSString = "E";
        else if (rgreen == 15) gSString = "F";
        else gSString = String.valueOf(rgreen);

        gFString = gFString + gSString;

        blue = b / 16;
        rblue = b % 16;

        if (blue == 10) bFString = "A";
        else if (blue == 11) bFString = "B";
        else if (blue == 12) bFString = "C";
        else if (blue == 13) bFString = "D";
        else if (blue == 14) bFString = "E";
        else if (blue == 15) bFString = "F";
        else bFString = String.valueOf(blue);

        if (rblue == 10) bSString = "A";
        else if (rblue == 11) bSString = "B";
        else if (rblue == 12) bSString = "C";
        else if (rblue == 13) bSString = "D";
        else if (rblue == 14) bSString = "E";
        else if (rblue == 15) bSString = "F";
        else bSString = String.valueOf(rblue);
        bFString = bFString + bSString;
        result = "#" + rFString + gFString + bFString;
        return result;

    }

将hsv颜色转换成rgb格式

    //hsv格式颜色转rgb格式
    public float[] hsb2rgb(float[] hsb) {
        float[] rgb= new float[3];
        //先令饱和度和亮度为100%，调节色相h
        for(int offset=240,i=0;i<3;i++,offset-=120) {
        //算出色相h的值和三个区域中心点(即0°，120°和240°)相差多少，然后根据坐标图按分段函数算出rgb。但因为色环展开后，红色区域的中心点是0°同时也是360°，不好算，索性将三个区域的中心点都向右平移到240°再计算比较方便
        float x=Math.abs((hsb[0]+offset)%360-240);
        //如果相差小于60°则为255
        if(x<=60) rgb[i]=255;
        //如果相差在60°和120°之间，
        else if(60120) rgb[i]=((1-(x-60)/60)*255);
        //如果相差大于120°则为0
        else rgb[i]=0;
        }
        //在调节饱和度s
        for(int i=0;i<3;i++)
        rgb[i]+=(255-rgb[i])*(1-hsb[1]);
        //最后调节亮度b
        for(int i=0;i<3;i++)
        rgb[i]*=hsb[2];
        return rgb;
        }