j2me工具类：TextUtil.java

import java.util.Vector;

import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;

public final class TextUtil {
    /**
     * 分割字符串
     * @param value 需要处理的字符串
     * @param regex 分隔符
     * @return 返回结果数组
     */
    public static String[] split(String value, String regex) {
        if (value == null || value.equals("")) {
            return null;
        }
        Vector split = new Vector();
        while (true) { //循环切割
            int index = value.indexOf(regex);
            if (index == -1) {
                if (value != null && !value.equals("")) {
                    split.addElement(value);
                    break;
                }
            }
            split.addElement(value.substring(0, index));
            value = value.substring(index + 1, value.length());
        }
        String[] s = new String[split.size()];
        split.copyInto(s);
        return s;
    }

    /**
     * 按照指定宽度分隔字符串
     * */
    public static String[] split(String value, Font font, int width) {
        String[] result = new String[1];
        if (font.stringWidth(value) < width) {
            result[0] = value;
            return result;
        } else {
            char[] ch = value.toCharArray();
            Vector lines = new Vector();
            StringBuffer sb = new StringBuffer();
            int w = 0;
            for (int i = 0; i < ch.length; i++) {
                w = w + font.charWidth(ch[i]);
                sb.append(ch[i]);
                if (w >= width - 12) {
                    lines.addElement(sb.toString());
                    sb.setLength(0);
                    w = 0;
                }
            }
            lines.addElement(sb.toString());
            result = new String[lines.size()];
            lines.copyInto(result);
            lines.removeAllElements();
            lines = null;
            return result;
        }
    }
    
    /**
     * 拆分字符串
     * sourceStr 要拆分字符串
     * maxWidth 最大宽度
     * split 分隔符集合
     */
    public static final Vector getSubsection(String sourceStr, int maxWidth, String split, Font font) {
        Vector vector = new Vector();
        String tmp = sourceStr;
        int i, j;
        int lastLength = 1;
        int step = 0;
        try {
            while (!tmp.equals("")) {
                i = tmp.indexOf("\n");
                if (i > 0) {
                    if (font.stringWidth(tmp.substring(0, i - 1)) > maxWidth) {
                        i = -1;
                    }
                }
                if (i == -1) {
                    if (lastLength > tmp.length()) {
                        i = tmp.length();
                    } else {
                        i = lastLength;
                        step = font.stringWidth(tmp.substring(0, i)) > maxWidth ? -1 : 1;
                        if (i < tmp.length()) {
                            while (!(font.stringWidth(tmp.substring(0, i)) <= maxWidth && font.stringWidth(tmp.substring(0, i + 1)) > maxWidth)) {
                                i = i + step;
                                if (i == tmp.length()) {
                                    break;
                                }
                            }
                        }
                    }
                    if (!split.equals("")) {
                        j = i;
                        if (i < tmp.length()) {
                            while (split.indexOf(tmp.substring(i - 1, i)) == -1) {
                                i--;
                                if (i == 0) {
                                    i = j;
                                    break;
                                }
                            }
                        }
                    }
                }
                lastLength = i;
                vector.addElement(tmp.substring(0, i));
                if (i == tmp.length()) {
                    tmp = "";
                } else {
                    tmp = tmp.substring(i);
                    if (tmp.substring(0, 1).equals("\n")) {
                        tmp = tmp.substring(1);
                    }
                }
            }
        } catch (Exception e) {
            System.out.println("getSub:" + e);
        }
        return vector;
    }

    /**
     * 文字自动换行
     * string 文字内容
     * x 起始坐标
     * y 起始坐标
     * width 文本最大宽度
     * color 文字颜色
     * font 字体
     */
    public static final void drawString(Graphics g, String string, int x, int y, int width, int color, Font font) {
        g.setColor(color);
        Vector vector = getSubsection(string, width, "", font);
        for (int i = 0; i < vector.size(); i++) {
            g.drawString((String) vector.elementAt(i), x, y + (font.getHeight() + 2) * i + 1, 20);
        }
        vector = null;
    }

    /**
     * 分割字符串显示,让菜单显示更漂亮,让界面显示的更完美^_^
     * 指定width以外的内容将用"..."显示
     */
    public static String devide(String value, Font font, int width) {
        if (font.stringWidth(value) < width) {
            return value;
        }
        char[] ch = value.toCharArray();
        StringBuffer sb = new StringBuffer();
        int w = 0;
        for (int i = 0; i < ch.length; i++) {
            w = w + font.charWidth(ch[i]);
            sb.append(ch[i]);
            if (w >= width) {
                sb.append("..."); //增加几个点会美观
                return sb.toString();
            }
        }
        return sb.toString();
    }

    /**
     * 提供常用的字符累加
     * 通过操作符号"+"是很耗内存的方法,所以提供一个StringBuffer的方法
     */
    public final static String append(String one, String two) {
        StringBuffer sb = new StringBuffer();
        sb.append(one);
        sb.append(two);
        return sb.toString();
    }

    public static boolean wrongCardNumber(String inputCardNumber) {
        int key = -1;
        int len = inputCardNumber.length();

        if (len < 16) {
            return true;
        }
        String tmp = inputCardNumber.substring(0, len - 1);
        int[] num = new int[tmp.length()];
        for (int i = 0; i < len; i++) {
            if (inputCardNumber.charAt(i) < '0' && inputCardNumber.charAt(i) > '9') {
                return true;
            }
        }
        for (int i = 0; i < num.length; i++) {
            num[i] = Integer.parseInt(tmp.substring(i, i + 1));
        }

        int total = 0;
        for (int i = num.length - 1; i >= 0; i -= 2) {
            total += (2 * num[i] / 10 + 2 * num[i] % 10);
        }
        for (int i = num.length - 2; i >= 0; i -= 2) {
            total += num[i];
        }
        if (total % 10 == 0) {
            key = 0;
        } else {
            key = (total / 10 + 1) * 10 - total;
        }
        if (key == Integer.parseInt(inputCardNumber.substring(len - 1, len))) {
            return false;
        }
        return true;
    }
//卡号4位4位显示，型如：1111-1111-1111-1111
    public static String formatNumber(String input) {
       int length = input.length();
		StringBuffer sb = new StringBuffer();
		// int j=0;
		for (int i = 0; i < length; i++) {
			if (i % 4 == 0 && i != 0) {
				sb.append('-');
				sb.append(input.charAt(i));
			} else {
				sb.append(input.charAt(i));
			}
		}
		return sb.toString();
   }


}