在开发当中一些封装好的方法可以提高开发效率，在此记录一些开发当中常用的方法，如果有好用的方法，在这里会不断的更新~
生成任意位数的随机字符串
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public static String getRandStr(int length) {
Random random = new Random();
String sRand = "";
for (int i = 0; i < length; i++) {
String indexStr = String.valueOf(random.nextInt(61));
int index = Integer.valueOf(indexStr);
String rand = chars[index];
sRand += rand;
}
return sRand;
}
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随机生成4位或者6位数字
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public static String randomNum(int length) {
if (length == 4) {
return toString((int) ((Math.random() * 9 + 1) * 1000));
} else {
return toString((int) ((Math.random() * 9 + 1) * 100000));
}
}
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生成任意位的随机数
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public static String getNum(int length) {
Random rd = new Random();
String[] radmon = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
String s = radmon[rd.nextInt(10)];
sb.append(s);
}
return sb.toString();
}
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格式化评论时间
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public static String formatCommentDate(Date date) {
Date nowDate = new Date();
long min = 60 * 1000L;
long hour = 60 * 60 * 1000L;
long day = 60 * 60 * 1000 * 24L;
long day5 = 60 * 60 * 1000 * 24 * 5L;
long time = (nowDate.getTime() - date.getTime());
SimpleDateFormat format = new SimpleDateFormat("MM-dd");
String str = "";
if (min > time) {
str = "刚刚";
} else if (hour > time) {
str = time / min + "分钟前";
} else if (day > time) {
str = time / hour + "小时前";
} else if (day5 > time) {
str = time / day + "天前";
} else if (day5 < time) {
str = format.format(date);
}
return str;
}
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将手机号替换成133****1234
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public static String replaceMobile(String mobile, String regex) {
String rep = mobile.substring(3, 7);
mobile = mobile.replaceAll(rep, regex);
return mobile;
}
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创建二维码
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public static void createQr(int width, int height, String filePath,
String content, String format) throws Exception {
Map map = Maps.newHashMap();
map.put(EncodeHintType.CHARACTER_SET, "utf-8");
map.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
map.put(EncodeHintType.MARGIN, 2);
BitMatrix bitMatrix = new MultiFormatWriter()
.encode(content, BarcodeFormat.QR_CODE, width, height);
Path file = new File(filePath).toPath();
MatrixToImageWriter.writeToPath(bitMatrix, format, file);
}
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