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：\t" + rgb[i][0] + "\t" + ColorUtils.getBlue(rgb[i][0]));
         }
     }

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

     @Test
     public void getRed() {
         for (int i = 0; i < rgb.length; i++) {
             System.out.println("获取红色：\t" + rgb[i][0] + "\t" + 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：\t" + hex[i][0] + "\t期望结果：" + hex[i][1] + "\t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] + "\t\t" + ColorUtils.isHex(hex[i][0]));
         }
     }

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

单元测试源码 ColorUtilsTest.java

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！ ^_^