Java学习-041-颜色工具类（RGB,HEX）

在日常的网页开发中，经常需要进行颜色数值获取、转换，例如获取红色，获取蓝色，获取绿色，RGB转十六进制颜色，十六进制颜色转RGB等，因而在学习过程中，写了一个小工具类，仅供各位小主参考！

多不闲言，直接上码了，哈哈哈。。。

颜色工具类源码 ColorUtils.java 如下所示：

/**
 * Aaron.ffp Inc.
 * Copyright (c) 2004-2016 All Rights Reserved.
 */
package cn.ffp.autotest.base.util;

import org.apache.log4j.Logger;

/**
 * <strong>颜色工具类</strong><br>
 * <ul>
 * <li>颜色进制转换</li>
 * <li>颜色合法性校验</li>
 * </ul>
 * <br>
 * @author Aaron.ffp
 * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java, 2016-03-02 11:32:40.447 Exp $
 */
public class ColorUtils {
    private static Logger logger = Logger.getLogger(ColorUtils.class.getName());
    private static String msg = "";
    
    private static String regHex = "^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$";
    private static String regRgb = "^(RGB\(|rgb\()([0-9]{1,3},){2}[0-9]{1,3}\)$";
    private static String regRepRgb = "(rgb|\(|\)|RGB)*";
    
    public ColorUtils() {
    }
    
    /**
     * <strong>颜色十六进制转颜色RGB</strong><br>
     * <ul>
     * <li>颜色十六进制参数不合法时，返回null</li>
     * </ul>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java hex2Rgb, 2016-03-24 23:50:42.004 Exp $
     * 
     * @param hex 颜色十六进制
     * @return 颜色RGB
     */
    public static String hex2Rgb(String hex) {
        StringBuilder sb = new StringBuilder();
        
        if (!ColorUtils.isHex(hex)) {
            msg = "颜色十六进制格式 【" + hex + "】 不合法，请确认！";
            logger.error(msg);
            return null;
        }
        
        String c = RegUtils.replace(hex.toUpperCase(), "#", "");
        
        String r = Integer.parseInt((c.length() == 3 ? c.substring(0, 1) + c.substring(0, 1) : c.substring(0, 2)), 16) + "";
        String g = Integer.parseInt((c.length() == 3 ? c.substring(1, 2) + c.substring(1, 2) : c.substring(2, 4)), 16) + "";
        String b = Integer.parseInt((c.length() == 3 ? c.substring(2, 3) + c.substring(2, 3) : c.substring(4, 6)), 16) + "";
        
        sb.append("RGB(" + r + "," + g + "," + b + ")");
        
        return sb.toString();
    }
    
    /**
     * <strong>颜色RGB转十六进制</strong><br>
     * <ul>
     * <li>颜色RGB不合法，则返回null</li>
     * </ul>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java rgb2Hex, 2016-03-15 23:49:33.224 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 合法时返回颜色十六进制
     */
    public static String rgb2Hex(String rgb) {
        StringBuilder sb = new StringBuilder();
        
        if (!ColorUtils.isRgb(rgb)) {
            msg = "颜色 RGB 格式【" + rgb + "】 不合法，请确认！";
            logger.error(msg);
            return null;
        }
        
        String r = Integer.toHexString(ColorUtils.getRed(rgb)).toUpperCase();
        String g = Integer.toHexString(ColorUtils.getGreen(rgb)).toUpperCase();
        String b = Integer.toHexString(ColorUtils.getBlue(rgb)).toUpperCase();
        
        sb.append("#");
        sb.append(r.length() == 1 ? "0" + r : r);
        sb.append(g.length() == 1 ? "0" + g : g);
        sb.append(b.length() == 1 ? "0" + b : b);
        
        return sb.toString();
    }
    
    /**
     * <strong>获取颜色RGB红色值</strong><br>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java getRed, 2016-03-22 23:48:50.501 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 红色值
     */
    public static int getRed(String rgb){
        return Integer.valueOf(ColorUtils.getRGB(rgb)[0]);
    }
    
    /**
     * <strong>获取颜色RGB绿色值</strong><br>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java getGreen, 2016-03-22 23:48:16.290 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 绿色值
     */
    public static int getGreen(String rgb){
        return Integer.valueOf(ColorUtils.getRGB(rgb)[1]);
    }

    /**
     * <strong>获取颜色RGB蓝色值</strong><br>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java getBlue, 2016-03-22 23:47:20.801 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 蓝色数值
     */
    public static int getBlue(String rgb){
        return Integer.valueOf(ColorUtils.getRGB(rgb)[2]);
    }
    
    /**
     * <strong>获取颜色RGB数组</strong><br>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java getRGB, 2016-03-21 23:46:00.944 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 颜色数组[红，绿，蓝]
     */
    public static String[] getRGB(String rgb){
        return RegUtils.replace(RegUtils.replaceSpace(rgb), regRepRgb, "").split(",");
    }
    
    /**
     * <strong>验证颜色十六进制是否合法</strong><br>
     * <ul>
     * <li>规则：#号开头，三位或六位字母数字组成的字符串</li>
     * </ul>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java isHex, 2016-03-20 23:44:03.133 Exp $
     * 
     * @param hex 十六进制颜色
     * @return 合法则返回true
     */
    public static boolean isHex(String hex) {
        return RegUtils.reg(hex, regHex);
    }
    
    /**
     * <strong>验证颜色RGB是否合法</strong><br>
     * <ul>
     * <li>1、RGB符合正则表达式</li>
     * <li>2、颜色值在0-255之间</li>
     * </ul>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java isRgb, 2016-03-12 23:41:19.925 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 是否合法，合法返回true
     */
    public static boolean isRgb(String rgb) {
        boolean r = ColorUtils.getRed(rgb) >= 0 && ColorUtils.getRed(rgb) <= 255;
        boolean g = ColorUtils.getGreen(rgb) >= 0 && ColorUtils.getGreen(rgb) <= 255;
        boolean b = ColorUtils.getBlue(rgb) >= 0 && ColorUtils.getBlue(rgb) <= 255;
        
        return ColorUtils.isRgbFormat(rgb) && r && g && b;
    }
    
    /**
     * <strong>验证颜色RGB是否匹配正则表达式</strong><br>
     * <ul>
     * <li>匹配则返回true</li>
     * </ul>
     * <br>
     * @author Aaron.ffp
     * @version V1.0.0: autotest-base cn.ffp.autotest.base.util ColorUtils.java isRgbFormat, 2016-03-03 23:40:12.267 Exp $
     * 
     * @param rgb 颜色RGB
     * @return 是否匹配
     */
    public static boolean isRgbFormat(String rgb) {
        return RegUtils.reg(RegUtils.replaceSpace(rgb), regRgb);
    }
}

颜色工具类单元测试源码 ColorUtilsTest.java 如下所示：

package cn.ffp.autotest.base.util;

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class ColorUtilsTest {
    String[][] rgb = new String[8][2];
    String[][] hex = new String[11][2];
    
    @BeforeClass
    public void beforeClass() {
        rgb[0][0] = "RGB(0,0,0)";
        rgb[1][0] = "RGB(0,128,255)";
        rgb[2][0] = "RGB(128,0,75)";
        rgb[3][0] = "RGB(128,0,0)";
        rgb[4][0] = "rgb(128,23,200)";
        rgb[5][0] = "rgb(128, 128, 128)";
        rgb[6][0] = "rgb(255, 255, 255)";
        rgb[7][0] = "rgb(128, 128, 300)";
        
        rgb[0][1] = "#000000";
        rgb[1][1] = "#0080FF";
        rgb[2][1] = "#80004B";
        rgb[3][1] = "#800000";
        rgb[4][1] = "#8017C8";
        rgb[5][1] = "#808080";
        rgb[6][1] = "#FFFFFF";
        rgb[7][1] = null;
        
        hex[0][0] = "#000000";
        hex[1][0] = "#000";
        hex[2][0] = "#FAFAFA";
        hex[3][0] = "#000080";
        hex[4][0] = "#008080";
        hex[5][0] = "#F0FF80";
        hex[6][0] = "#EA00FA";
        hex[7][0] = "#00EAEA";
        hex[8][0] = "#876";
        hex[9][0] = "#000xEA";
        hex[10][0] = "#ghi";
        
        hex[0][1] = "RGB(0,0,0)";
        hex[1][1] = "RGB(0,0,0)";
        hex[2][1] = "RGB(250,250,250)";
        hex[3][1] = "RGB(0,0,128)";
        hex[4][1] = "RGB(0,128,128)";
        hex[5][1] = "RGB(240,255,128)";
        hex[6][1] = "RGB(234,0,250)";
        hex[7][1] = "RGB(136,119,102)";
        hex[8][1] = "RGB(0,0,0)";
        hex[9][1] = null;
        hex[10][1] = null;
    }

    @Test
    public void getBlue() {
        for (int i = 0; i < rgb.length; i++) {
            System.out.println("获取蓝色：	" + rgb[i][0] + "	" + ColorUtils.getBlue(rgb[i][0]));
        }
    }

    @Test
    public void getGreen() {
        for (int i = 0; i < rgb.length; i++) {
            System.out.println("获取绿色：	" + rgb[i][0] + "	" + ColorUtils.getGreen(rgb[i][0]));
        }
    }

    @Test
    public void getRed() {
        for (int i = 0; i < rgb.length; i++) {
            System.out.println("获取红色：	" + rgb[i][0] + "	" + ColorUtils.getRed(rgb[i][0]));
        }
    }

    @Test
    public void hex2Rgb() {
        for (int i = 0; i < hex.length; i++) {
            System.out.println("十六进制转 RGB：	" + hex[i][0] + "	期望结果：" + hex[i][1] + "	实际结果：" + ColorUtils.hex2Rgb(hex[i][0]));
        }
    }

    @Test
    public void isHex() {
        for (int i = 0; i < hex.length; i++) {
            System.out.println(hex[i][0] + "		" + ColorUtils.isHex(hex[i][0]));
        }
    }

    @Test
    public void isRgb() {
        for (int i = 0; i < rgb.length; i++) {
            System.out.println(rgb[i][0] + "		" + ColorUtils.isRgb(rgb[i][0]));
        }
    }

    @Test
    public void rgb2Hex() {
        for (int i = 0; i < rgb.length; i++) {
            System.out.println("RGB 转十六进制：	" + rgb[i][0] + "	期望结果：" + rgb[i][1] + "	实际结果：" + ColorUtils.rgb2Hex(rgb[i][0]));
        }
    }
}

至此， Java学习-041-颜色工具类（RGB,HEX） 顺利完结，希望此文能够给初学 JavaWeb 的您一份参考。

最后，非常感谢亲的驻足，希望此文能对亲有所帮助。热烈欢迎亲一起探讨，共同进步。非常感谢！ ^_^