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(); }}